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Update SCP03 tests with PlatformSCP03 integration tests and documentation

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- Add PlatformSCP03 integration test cases (test_scp03_platform_integration, test_scp03_platform_key_file)
- Update test helpers with mock session creation
- Update README with PlatformSCP03 configuration guide
- Add references to NXP AN12413 and AN12436
- Fix test assertions to work with opaque session type
This commit is contained in:
km
2026-03-26 07:27:23 +09:00
commit c29a189b9a
13 changed files with 3192 additions and 0 deletions
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CMakeLists.txt
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cmake_minimum_required(VERSION 3.10)
project(se050_wireguard C)
set(CMAKE_C_STANDARD 11)
set(CMAKE_C_STANDARD_REQUIRED ON)
# Include directories
include_directories(
${CMAKE_SOURCE_DIR}/include
)
# Source files
set(SOURCES
src/se050_i2c_hal.c
src/se050_session.c
src/se050_keystore.c
src/se050_rng.c
src/se050_x25519.c
src/se050_scp03.c
)
# Create library
add_library(se050_wireguard STATIC ${SOURCES})
# Linux-specific flags
if(UNIX AND NOT APPLE)
# OpenSSL for SCP03 encryption
find_package(OpenSSL REQUIRED)
target_link_libraries(se050_wireguard OpenSSL::SSL OpenSSL::Crypto)
endif()
# Enable testing
option(BUILD_TESTS "Build test suite" ON)
if(BUILD_TESTS)
enable_testing()
# SCP03 tests
add_executable(test_scp03 tests/test_scp03.c)
target_link_libraries(test_scp03 se050_wireguard)
if(UNIX AND NOT APPLE)
target_link_libraries(test_scp03 OpenSSL::SSL OpenSSL::Crypto)
endif()
add_test(NAME SCP03Tests COMMAND test_scp03)
endif()
# Install headers
install(FILES include/se050_wireguard.h
DESTINATION include)
# Install library
install(TARGETS se050_wireguard
ARCHIVE DESTINATION lib)
README.md
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# SE050 WireGuard - Clean Room Implementation
MIT ライセンスで実装された NXP SE050 用 WireGuard クリーンルームライブラリ。
## 機能
- **X25519 ECDH**: 鍵交換のための楕円曲線 Diffie-Hellman
- **TRNG**: SE050 の真性乱数生成器
- **Platform SCP03**: 通信経路の暗号化
- **I2C HAL**: ハードウェア抽象化レイヤ
## ディレクトリ構成
```
se050-wireguard/
├── include/
│ └── se050_wireguard.h # メイン API ヘッダー
├── src/
│ ├── se050_i2c_hal.c # I2C ハードウェア抽象化
│ ├── se050_session.c # セッション管理
│ ├── se050_keystore.c # 鍵ストア
│ ├── se050_rng.c # 乱数生成
│ ├── se050_x25519.c # X25519 ECDH
│ └── se050_scp03.c # SCP03 暗号化
└── README.md
```
## ビルド
### 依存関係
- Linux (I2C サポート)
- GCC/Clang
- CMake 3.10+
```bash
mkdir build && cd build
cmake ..
make
```
## 使用方法
### 初期化
```c
#include "se050_wireguard.h"
se050_i2c_hal_t hal;
se050_session_ctx_t *session;
se050_keystore_ctx_t *keystore;
se050_rng_ctx_t *rng;
// I2C HAL 初期化
se050_i2c_init(&hal, "/dev/i2c-1", 0x90);
// WireGuard サブシステム初期化
se050_wireguard_init(&hal, &session, &keystore, &rng);
```
### 鍵生成
```c
se050_x25519_keypair_t keypair;
// 鍵ペア生成（SE050 内で秘密鍵が生成・保存）
se050_wireguard_generate_key(keystore, rng, &keypair, 0x12345678);
// 公開鍵をエクスポート
se050_x25519_export_public_key(keystore, 0x12345678, keypair.public_key);
```
### 共有秘密計算
```c
uint8_t peer_public[32]; // ピアから取得した公開鍵
uint8_t shared_secret[32];
// ECDH 共有秘密計算（SE050 内で計算）
se050_wireguard_compute_shared(keystore, 0x12345678, peer_public, shared_secret);
```
### SCP03 暗号化
```c
se050_scp03_ctx_t *scp03;
uint8_t enc_key[16]; // 暗号化キー
uint8_t mac_key[16]; // MAC キー
uint8_t dek_key[16]; // データ暗号化キー（鍵導出用）
// SCP03 初期化
se050_scp03_init(&scp03, session);
// キー設定（ENC + MAC + DEK の 3 つ）
se050_scp03_set_keys(scp03, enc_key, mac_key, dek_key);
// コマンド暗号化
uint8_t cmd[256];
size_t cmd_len = 100;
se050_scp03_encrypt_command(scp03, cmd, &cmd_len);
// レスポンス復号
uint8_t rsp[256];
size_t rsp_len = 200;
uint16_t sw = se050_scp03_decrypt_response(scp03, cmd_len, rsp, &rsp_len);
```
### クリーンアップ
```c
se050_wireguard_cleanup(session, keystore, rng);
se050_scp03_free(scp03);
se050_i2c_close(&hal);
```
## API リファレンス
### I2C HAL
| 関数 | 説明 |
|------|------|
| `se050_i2c_init()` | I2C デバイスを初期化 |
| `se050_i2c_close()` | I2C デバイスを閉じる |
| `se050_i2c_read()` | I2C から読み取り |
| `se050_i2c_write()` | I2C に書き込み |
| `se050_i2c_wakeup()` | SE050 をウェイクアップ |
### セッション管理
| 関数 | 説明 |
|------|------|
| `se050_session_create()` | セッションを作成 |
| `se050_session_open()` | セッションを開く |
| `se050_session_close()` | セッションを閉じる |
| `se050_session_delete()` | セッションを削除 |
### 鍵ストア
| 関数 | 説明 |
|------|------|
| `se050_keystore_init()` | 鍵ストアを初期化 |
| `se050_keystore_free()` | 鍵ストアを解放 |
### 乱数生成
| 関数 | 説明 |
|------|------|
| `se050_rng_init()` | RNG контекстを初期化 |
| `se050_rng_generate()` | 乱数を生成 |
| `se050_rng_free()` | RNG контекстを解放 |
### X25519 ECDH
| 関数 | 説明 |
|------|------|
| `se050_x25519_generate_keypair()` | 鍵ペアを生成 |
| `se050_x25519_compute_shared_secret()` | 共有秘密を計算 |
| `se050_x25519_export_public_key()` | 公開鍵をエクスポート |
### SCP03
| 関数 | 説明 |
|------|------|
| `se050_scp03_init()` | SCP03 контекстを初期化 |
| `se050_scp03_set_keys()` | ENC/MAC/DEK キーを設定 |
| `se050_scp03_encrypt_command()` | コマンドを暗号化 |
| `se050_scp03_decrypt_response()` | レスポンスを復号 |
| `se050_scp03_free()` | SCP03 контекстを解放 |
## 注意
- 秘密鍵は SE050 内で生成・保存され、外部にエクスポートされません
- 共有秘密計算は SE050 内で実行されます
- **Platform SCP03 キーは 3 つ必要です**:
- **ENC (Encryption Key)**: コマンド暗号化/レスポンス復号用（16 バイト）
- **MAC (Message Authentication Code Key)**: 通信認証用 ICV 計算（16 バイト）
- **DEK (Data Encryption Key)**: セッション鍵導出用（16 バイト）
- SCP03 キーは事前に取得しておく必要があります
- **PlatformSCP03 の設定方法**:
1. NXP の管理ツールで SE050 に PlatformSCP03 キーをプロビジョニング
2. キーは安全な経路でホストに配送（鍵ファイルまたは安全なストレージ）
3. アプリケーション起動時にキーをロード
4. `se050_scp03_set_keys()` または `se050_scp03_load_keys_from_file()` で設定
## ライセンス
MIT License
## 参考文献
- [NXP SE050 Datasheet](https://www.nxp.com/products/:SE050)
- [WireGuard Protocol](https://www.wireguard.com/protocol/)
- [X25519 RFC 7748](https://tools.ietf.org/html/rfc7748)
- [SCP03 Specification](https://globalplatform.org/)
- [NXP AN12413 - Platform SCP03](https://www.nxp.com/docs/en/application-note/AN12413.pdf)
- [NXP AN12436 - SE050 Configurations](https://www.nxp.com/docs/en/application-note/AN12436.pdf)
## PlatformSCP03 設定ガイド
### キーの生成とプロビジョニング
PlatformSCP03 を使用する場合は、以下の手順でキーを設定します：
1. **NXP Plug & Trust ミドルウェアを使用**
```bash
# NXP のツールでキーを生成
sss_tsp_scp03_keygen --output scp03_keys.bin
```
2. **キーファイルを安全に保存**
- キーファイルは 48 バイト（ENC 16 + MAC 16 + DEK 16）
- 暗号化されたストレージに保存推奨
3. **SE050 へのプロビジョニング**
```bash
# NXP ツールで SE050 にキーをロード
sss_top_scp03_provision --keys scp03_keys.bin --device /dev/i2c-1
```
### キーのロード
アプリケーションからキーをロード：
```c
se050_scp03_ctx_t *scp03;
se050_scp03_init(&scp03, session);
// キーファイルからロード（48 バイト）
se050_scp03_load_keys_from_file(scp03, "/secure/path/to/scp03_keys.bin");
// または個別にキーを設定
se050_scp03_set_keys(scp03, enc_key, mac_key, dek_key);
```
### キーの管理
- キーファイルの権限：`chmod 600`（所有者のみ読み取り可能）
- メモリ上のキーは使用後に `memzero_explicit()` でクリア
- キーのバックアップは安全な場所に保管
include/se050_crypto_utils.h
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/**
* @file se050_crypto_utils.h
* @brief Cryptographic utility functions
*
* Constant-time memory operations for security-critical code.
*
* License: MIT (Clean-room implementation)
*/
#ifndef SE050_CRYPTO_UTILS_H
#define SE050_CRYPTO_UTILS_H
#include <stdint.h>
#include <stddef.h>
#ifdef __linux__
/* Linux kernel-style definitions */
#include <linux/types.h>
/* Constant-time memory comparison */
static inline int crypto_memneq(const void *a, const void *b, size_t len)
{
const volatile uint8_t *pa = (const volatile uint8_t *)a;
const volatile uint8_t *pb = (const volatile uint8_t *)b;
volatile uint8_t result = 0;
size_t i;
for (i = 0; i < len; i++) {
result |= pa[i] ^ pb[i];
}
return result;
}
/* Constant-time memory zeroing */
static inline void memzero_explicit(void *s, size_t count)
{
volatile uint8_t *p = (volatile uint8_t *)s;
while (count--) {
*p++ = 0;
}
/* Prevent compiler from optimizing out the zeroing */
__asm__ __volatile__("":::"memory");
}
#else
/* Non-Linux implementations */
/**
* @brief Constant-time memory comparison
* @param a First memory area
* @param b Second memory area
* @param len Number of bytes to compare
* @return 0 if equal, non-zero otherwise
*
* This function runs in constant time to prevent timing attacks.
*/
static inline int crypto_memneq(const void *a, const void *b, size_t len)
{
const volatile uint8_t *pa = (const volatile uint8_t *)a;
const volatile uint8_t *pb = (const volatile uint8_t *)b;
volatile uint8_t result = 0;
size_t i;
for (i = 0; i < len; i++) {
result |= pa[i] ^ pb[i];
}
return result;
}
/**
* @brief Constant-time memory zeroing
* @param s Memory area to zero
* @param count Number of bytes to zero
*
* This function uses volatile to prevent compiler optimization.
*/
static inline void memzero_explicit(void *s, size_t count)
{
volatile uint8_t *p = (volatile uint8_t *)s;
while (count--) {
*p++ = 0;
}
}
/* Memory barrier for non-Linux platforms */
#ifndef barrier
#define barrier() do { __asm__ __volatile__("": : :"memory"); } while(0)
#endif
/* ssize_t definition for non-Linux platforms */
#ifndef _SSIZE_T_DEFINED
#define _SSIZE_T_DEFINED
#include <sys/types.h>
#endif
#endif /* __linux__ */
/* Additional security utilities */
/**
* @brief Securely compare two buffers
* @param a First buffer
* @param b Second buffer
* @param len Length of buffers
* @return 0 if equal, -1 if different
*/
static inline int secure_memcmp(const void *a, const void *b, size_t len)
{
return crypto_memneq(a, b, len) ? -1 : 0;
}
/**
* @brief Securely copy memory with zeroing of destination first
* @param dst Destination buffer
* @param src Source buffer
* @param len Number of bytes to copy
*/
static inline void secure_memcpy(void *dst, const void *src, size_t len)
{
memzero_explicit(dst, len);
__builtin_memcpy(dst, src, len);
}
#endif /* SE050_CRYPTO_UTILS_H */
include/se050_keystore_internal.h
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/**
* @file se050_keystore_internal.h
* @brief SE050 Key Store Internal Definitions
*
* Internal definitions for key store implementation.
*
* License: MIT (Clean-room implementation)
*/
#ifndef SE050_KEYSTORE_INTERNAL_H
#define SE050_KEYSTORE_INTERNAL_H
#include "se050_wireguard.h"
#include <stdint.h>
#include <stddef.h>
/* Key object types */
typedef enum {
KEY_PART_PRIVATE = 0,
KEY_PART_PUBLIC,
KEY_PART_PAIR,
} key_part_t;
/* Key cipher types */
typedef enum {
CIPHER_TYPE_NONE = 0,
CIPHER_TYPE_EC_MONTGOMERY, /* X25519 */
CIPHER_TYPE_EC_NIST_P256,
CIPHER_TYPE_AES,
} cipher_type_t;
/* Key object flags */
#define KEY_FLAG_PERSISTENT (1 << 0)
#define KEY_FLAG_TRANSIENT (1 << 1)
#define KEY_FLAG_GENERATED (1 << 2)
#define KEY_FLAG_EXPORTED (1 << 3)
/**
* @brief Key object structure
*/
typedef struct {
uint32_t key_id; /**< Key identifier */
key_part_t key_part; /**< Key part (private/public/pair) */
cipher_type_t cipher_type; /**< Cipher type */
size_t key_size; /**< Key size in bytes */
uint8_t flags; /**< Key flags */
uint8_t private_key[32]; /**< Private key data (secure) */
uint8_t public_key[32]; /**< Public key data */
} key_object_t;
/**
* @brief Key store context structure
*/
struct se050_keystore_ctx {
se050_session_ctx_t *session; /**< Associated session */
key_object_t *objects; /**< Key objects array */
size_t num_objects; /**< Number of key objects */
size_t max_objects; /**< Maximum key objects */
};
/* Internal functions */
key_object_t *find_key_object(se050_keystore_ctx_t *keystore, uint32_t key_id);
key_object_t *allocate_key_object(se050_keystore_ctx_t *keystore);
se050_status_t se050_keystore_generate_key(se050_keystore_ctx_t *keystore,
uint32_t key_id,
cipher_type_t cipher_type,
size_t key_size,
uint8_t *private_key,
uint8_t *public_key);
se050_status_t se050_keystore_get_public_key(se050_keystore_ctx_t *keystore,
uint32_t key_id,
uint8_t *public_key,
size_t *key_size);
se050_status_t se050_keystore_get_private_key(se050_keystore_ctx_t *keystore,
uint32_t key_id,
uint8_t *private_key,
size_t *key_size);
#endif /* SE050_KEYSTORE_INTERNAL_H */
include/se050_session_internal.h
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/**
* @file se050_session_internal.h
* @brief SE050 Session Internal Definitions
*
* Internal definitions for session implementation.
*
* License: MIT (Clean-room implementation)
*/
#ifndef SE050_SESSION_INTERNAL_H
#define SE050_SESSION_INTERNAL_H
#include "se050_wireguard.h"
#include <stdint.h>
/* Session states */
typedef enum {
SESSION_STATE_CREATED = 0,
SESSION_STATE_OPENED,
SESSION_STATE_CLOSED,
} session_state_t;
/**
* @brief Session context structure
*/
struct se050_session_ctx {
se050_i2c_hal_t *hal; /**< I2C HAL interface */
session_state_t state; /**< Current session state */
uint32_t session_id; /**< Unique session identifier */
uint8_t session_key[32]; /**< Session encryption key */
size_t session_key_len; /**< Session key length */
uint32_t cmd_counter; /**< Command counter for SCP03 */
uint32_t resp_counter; /**< Response counter for SCP03 */
se050_rng_ctx_t *rng; /**< RNG context */
};
#endif /* SE050_SESSION_INTERNAL_H */
include/se050_wireguard.h
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/**
* @file se050_wireguard.h
* @brief SE050 WireGuard Minimum Interface
*
* Clean-room interface for WireGuard cryptographic operations using SE050.
*
* This header defines the API for:
* - X25519 ECDH key exchange
* - True Random Number Generation (TRNG)
* - Platform SCP03 secure channel
*
* License: MIT (Clean-room implementation)
*/
#ifndef SE050_WIREGUARD_H
#define SE050_WIREGUARD_H
#include <stdint.h>
#include <stddef.h>
#ifdef __cplusplus
extern "C" {
#endif
/* ============================================================================
* Error Codes
* ============================================================================ */
typedef enum {
SE050_OK = 0x00,
SE050_ERR_FAIL = 0x01,
SE050_ERR_INVALID_ARG = 0x02,
SE050_ERR_SESSION = 0x03,
SE050_ERR_KEY_STORE = 0x04,
SE050_ERR_RNG = 0x05,
SE050_ERR_ECDH = 0x06,
SE050_ERR_SCP03 = 0x07,
SE050_ERR_I2C = 0x08,
SE050_ERR_NOT_INIT = 0x09,
} se050_status_t;
/* ============================================================================
* Constants
* ============================================================================ */
/** WireGuard key size (X25519 uses 32-byte keys) */
#define SE050_WG_KEY_SIZE 32
/** WireGuard public key size */
#define SE050_WG_PUBKEY_SIZE 32
/** SCP03 key size */
#define SE050_SCP03_KEY_SIZE 16
/** SCP03 IV size */
#define SE050_SCP03_IV_SIZE 16
/** SCP03 CMAC size */
#define SE050_SCP03_CMAC_SIZE 8
/** Maximum buffer size for SCP03 */
#define SE050_SCP03_MAX_BUF 1024
/* ============================================================================
* Type Definitions
* ============================================================================ */
/** Session context for SE050 communication */
typedef struct se050_session_ctx se050_session_ctx_t;
/** Key store context */
typedef struct se050_keystore_ctx se050_keystore_ctx_t;
/** RNG context */
typedef struct se050_rng_ctx se050_rng_ctx_t;
/** SCP03 session context */
typedef struct se050_scp03_ctx se050_scp03_ctx_t;
/** X25519 key pair */
typedef struct {
uint8_t private_key[SE050_WG_KEY_SIZE]; /**< Private key (32 bytes) */
uint8_t public_key[SE050_WG_PUBKEY_SIZE]; /**< Public key (32 bytes) */
} se050_x25519_keypair_t;
/** I2C HAL interface */
typedef struct {
void *handle; /**< I2C device handle */
uint8_t slave_addr; /**< I2C slave address (default: 0x90) */
const char *dev_path; /**< Device path (e.g., "/dev/i2c-1") */
} se050_i2c_hal_t;
/* ============================================================================
* I2C HAL Layer
* ============================================================================ */
/**
* @brief Initialize I2C HAL
* @param hal I2C HAL structure
* @param dev_path Device path (e.g., "/dev/i2c-1")
* @param slave_addr I2C slave address (default: 0x90)
* @return SE050_OK on success
*/
se050_status_t se050_i2c_init(se050_i2c_hal_t *hal, const char *dev_path, uint8_t slave_addr);
/**
* @brief Close I2C HAL
* @param hal I2C HAL structure
*/
void se050_i2c_close(se050_i2c_hal_t *hal);
/**
* @brief Read from SE050 via I2C
* @param hal I2C HAL structure
* @param buffer Read buffer
* @param length Number of bytes to read
* @return Number of bytes read, or negative on error
*/
int se050_i2c_read(se050_i2c_hal_t *hal, uint8_t *buffer, int length);
/**
* @brief Write to SE050 via I2C
* @param hal I2C HAL structure
* @param buffer Write buffer
* @param length Number of bytes to write
* @return Number of bytes written, or negative on error
*/
int se050_i2c_write(se050_i2c_hal_t *hal, const uint8_t *buffer, int length);
/**
* @brief Wake up SE050 (if needed)
* @param hal I2C HAL structure
* @return SE050_OK on success
*/
se050_status_t se050_i2c_wakeup(se050_i2c_hal_t *hal);
/* ============================================================================
* Session Management
* ============================================================================ */
/**
* @brief Create SE050 session
* @param ctx Output session context
* @param hal I2C HAL interface
* @return SE050_OK on success
*/
se050_status_t se050_session_create(se050_session_ctx_t **ctx, se050_i2c_hal_t *hal);
/**
* @brief Open SE050 session
* @param ctx Session context
* @return SE050_OK on success
*/
se050_status_t se050_session_open(se050_session_ctx_t *ctx);
/**
* @brief Close SE050 session
* @param ctx Session context
*/
void se050_session_close(se050_session_ctx_t *ctx);
/**
* @brief Delete SE050 session
* @param ctx Session context
*/
void se050_session_delete(se050_session_ctx_t *ctx);
/* ============================================================================
* Key Store
* ============================================================================ */
/**
* @brief Initialize key store
* @param ctx Output key store context
* @param session SE050 session
* @return SE050_OK on success
*/
se050_status_t se050_keystore_init(se050_keystore_ctx_t **ctx, se050_session_ctx_t *session);
/**
* @brief Free key store
* @param ctx Key store context
*/
void se050_keystore_free(se050_keystore_ctx_t *ctx);
/* ============================================================================
* Random Number Generation (TRNG)
* ============================================================================ */
/**
* @brief Initialize RNG context
* @param ctx Output RNG context
* @param session SE050 session
* @return SE050_OK on success
*/
se050_status_t se050_rng_init(se050_rng_ctx_t **ctx, se050_session_ctx_t *session);
/**
* @brief Generate random bytes using SE050 TRNG
* @param ctx RNG context
* @param output Output buffer
* @param length Number of bytes to generate
* @return SE050_OK on success
*/
se050_status_t se050_rng_generate(se050_rng_ctx_t *ctx, uint8_t *output, size_t length);
/**
* @brief Free RNG context
* @param ctx RNG context
*/
void se050_rng_free(se050_rng_ctx_t *ctx);
/* ============================================================================
* X25519 ECDH
* ============================================================================ */
/**
* @brief Generate X25519 key pair
* @param keystore Key store context
* @param keypair Output key pair
* @param key_id Unique key identifier
* @return SE050_OK on success
*
* Note: Private key is generated using SE050 TRNG and stored securely.
* The private key never leaves the SE050.
*/
se050_status_t se050_x25519_generate_keypair(se050_keystore_ctx_t *keystore,
se050_x25519_keypair_t *keypair,
uint32_t key_id);
/**
* @brief Compute X25519 ECDH shared secret
* @param keystore Key store context
* @param private_key_id Local private key ID
* @param peer_public Peer's public key (32 bytes)
* @param shared_secret Output shared secret (32 bytes)
* @return SE050_OK on success
*
* Note: ECDH computation is performed inside SE050.
*/
se050_status_t se050_x25519_compute_shared_secret(se050_keystore_ctx_t *keystore,
uint32_t private_key_id,
const uint8_t *peer_public,
uint8_t *shared_secret);
/**
* @brief Export X25519 public key from SE050
* @param keystore Key store context
* @param key_id Key identifier
* @param public_key Output public key (32 bytes)
* @return SE050_OK on success
*/
se050_status_t se050_x25519_export_public_key(se050_keystore_ctx_t *keystore,
uint32_t key_id,
uint8_t *public_key);
/* ============================================================================
* Platform SCP03 Secure Channel
* ============================================================================ */
/**
* @brief Initialize SCP03 context
* @param ctx Output SCP03 context
* @param session SE050 session
* @return SE050_OK on success
*/
se050_status_t se050_scp03_init(se050_scp03_ctx_t **ctx, se050_session_ctx_t *session);
/**
* @brief Set SCP03 keys (ENC, MAC, and DEK)
* @param ctx SCP03 context
* @param enc_key Encryption key (16 bytes)
* @param mac_key MAC key (16 bytes)
* @param dek_key Data Encryption Key (16 bytes)
* @return SE050_OK on success
*/
se050_status_t se050_scp03_set_keys(se050_scp03_ctx_t *ctx,
const uint8_t *enc_key,
const uint8_t *mac_key,
const uint8_t *dek_key);
/**
* @brief Load SCP03 keys from file
* @param ctx SCP03 context
* @param file_path Path to key file (ENC[16] + MAC[16] + DEK[16] = 48 bytes)
* @return SE050_OK on success
*/
se050_status_t se050_scp03_load_keys_from_file(se050_scp03_ctx_t *ctx, const char *file_path);
/**
* @brief Encrypt command APDU
* @param ctx SCP03 context
* @param cmd Command buffer (in-place encryption)
* @param cmd_len Command length (updated after padding)
* @return SE050_OK on success
*/
se050_status_t se050_scp03_encrypt_command(se050_scp03_ctx_t *ctx,
uint8_t *cmd,
size_t *cmd_len);
/**
* @brief Decrypt response APDU
* @param ctx SCP03 context
* @param cmd_len Original command length (for ICV calculation)
* @param rsp Response buffer (in-place decryption)
* @param rsp_len Response length (updated after decryption)
* @return SW status code (e.g., 0x9000 for success)
*/
uint16_t se050_scp03_decrypt_response(se050_scp03_ctx_t *ctx,
size_t cmd_len,
uint8_t *rsp,
size_t *rsp_len);
/**
* @brief Free SCP03 context
* @param ctx SCP03 context
*/
void se050_scp03_free(se050_scp03_ctx_t *ctx);
/* ============================================================================
* High-Level WireGuard API
* ============================================================================ */
/**
* @brief Initialize WireGuard SE050 subsystem
* @param hal I2C HAL interface
* @param session Output session context
* @param keystore Output key store context
* @param rng Output RNG context
* @return SE050_OK on success
*/
se050_status_t se050_wireguard_init(se050_i2c_hal_t *hal,
se050_session_ctx_t **session,
se050_keystore_ctx_t **keystore,
se050_rng_ctx_t **rng);
/**
* @brief Generate WireGuard key pair
* @param keystore Key store context
* @param rng RNG context
* @param keypair Output key pair
* @param key_id Key identifier
* @return SE050_OK on success
*/
se050_status_t se050_wireguard_generate_key(se050_keystore_ctx_t *keystore,
se050_rng_ctx_t *rng,
se050_x25519_keypair_t *keypair,
uint32_t key_id);
/**
* @brief Compute WireGuard shared secret
* @param keystore Key store context
* @param key_id Local private key ID
* @param peer_public Peer's public key
* @param shared_secret Output shared secret
* @return SE050_OK on success
*/
se050_status_t se050_wireguard_compute_shared(se050_keystore_ctx_t *keystore,
uint32_t key_id,
const uint8_t *peer_public,
uint8_t *shared_secret);
/**
* @brief Cleanup WireGuard SE050 subsystem
* @param session Session context
* @param keystore Key store context
* @param rng RNG context
*/
void se050_wireguard_cleanup(se050_session_ctx_t *session,
se050_keystore_ctx_t *keystore,
se050_rng_ctx_t *rng);
#ifdef __cplusplus
}
#endif
#endif /* SE050_WIREGUARD_H */
src/se050_i2c_hal.c
+240
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/**
* @file se050_i2c_hal.c
* @brief SE050 I2C HAL Implementation
*
* Clean-room I2C hardware abstraction layer for SE050.
*
* License: MIT (Clean-room implementation)
*/
#define _POSIX_C_SOURCE 200809L
#include "se050_wireguard.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <linux/i2c-dev.h>
#include <time.h>
#ifdef __linux__
/* Linux-specific I2C IOCTL definitions */
#ifndef I2C_SLAVE
#define I2C_SLAVE 0x0703
#endif
#ifndef I2C_SMBUS
#define I2C_SMBUS 0x0720
#endif
#endif
/* SE050 default I2C address */
#define SE050_I2C_ADDR_DEFAULT 0x90
/* I2C timeout in milliseconds */
#define SE050_I2C_TIMEOUT_MS 1000
/* Maximum retry count for I2C operations */
#define SE050_I2C_MAX_RETRY 3
/* SE050 wakeup delay in milliseconds */
#define SE050_WAKEUP_DELAY_MS 5
/**
* @brief Sleep for specified milliseconds
*/
static void se050_sleep_ms(unsigned int ms)
{
#ifdef __linux__
struct timespec ts;
ts.tv_sec = ms / 1000;
ts.tv_nsec = (ms % 1000) * 1000000L;
nanosleep(&ts, NULL);
#else
/* Fallback for non-Linux platforms */
volatile int i;
for (i = 0; i < ms * 1000; i++);
#endif
}
/**
* @brief Open I2C device
*/
static void *i2c_open(const char *dev_path)
{
int fd;
if (!dev_path) {
return NULL;
}
fd = open(dev_path, O_RDWR);
if (fd < 0) {
perror("I2C open failed");
return NULL;
}
return (void *)(intptr_t)fd;
}
/**
* @brief Close I2C device
*/
static void i2c_close(void *handle)
{
int fd = (int)(intptr_t)handle;
if (fd >= 0) {
close(fd);
}
}
/**
* @brief Set I2C slave address
*/
static se050_status_t i2c_set_slave_addr(void *handle, uint8_t addr)
{
int fd = (int)(intptr_t)handle;
int ret;
ret = ioctl(fd, I2C_SLAVE, addr >> 1);
if (ret < 0) {
perror("I2C set slave address failed");
return SE050_ERR_I2C;
}
return SE050_OK;
}
/* ============================================================================
* Public API Implementation
* ============================================================================ */
se050_status_t se050_i2c_init(se050_i2c_hal_t *hal, const char *dev_path, uint8_t slave_addr)
{
void *handle;
if (!hal || !dev_path) {
return SE050_ERR_INVALID_ARG;
}
memset(hal, 0, sizeof(*hal));
/* Open I2C device */
handle = i2c_open(dev_path);
if (!handle) {
return SE050_ERR_I2C;
}
/* Set slave address */
if (i2c_set_slave_addr(handle, slave_addr) != SE050_OK) {
i2c_close(handle);
return SE050_ERR_I2C;
}
hal->handle = handle;
hal->slave_addr = slave_addr;
hal->dev_path = strdup(dev_path);
return SE050_OK;
}
void se050_i2c_close(se050_i2c_hal_t *hal)
{
if (!hal) {
return;
}
if (hal->handle) {
i2c_close(hal->handle);
hal->handle = NULL;
}
if (hal->dev_path) {
free((void *)hal->dev_path);
hal->dev_path = NULL;
}
hal->slave_addr = 0;
}
int se050_i2c_read(se050_i2c_hal_t *hal, uint8_t *buffer, int length)
{
int fd;
int retry;
int bytes_read;
if (!hal || !buffer || length <= 0) {
return -1;
}
fd = (int)(intptr_t)hal->handle;
for (retry = 0; retry < SE050_I2C_MAX_RETRY; retry++) {
bytes_read = read(fd, buffer, length);
if (bytes_read > 0) {
return bytes_read;
}
if (errno != EAGAIN && errno != ETIMEDOUT) {
/* Permanent error */
break;
}
/* Retry with delay */
se050_sleep_ms(SE050_WAKEUP_DELAY_MS);
}
return -1;
}
int se050_i2c_write(se050_i2c_hal_t *hal, const uint8_t *buffer, int length)
{
int fd;
int retry;
int bytes_written;
if (!hal || !buffer || length <= 0) {
return -1;
}
fd = (int)(intptr_t)hal->handle;
for (retry = 0; retry < SE050_I2C_MAX_RETRY; retry++) {
bytes_written = write(fd, buffer, length);
if (bytes_written > 0) {
return bytes_written;
}
if (errno != EAGAIN && errno != ETIMEDOUT) {
/* Permanent error */
break;
}
/* Retry with delay */
se050_sleep_ms(SE050_WAKEUP_DELAY_MS);
}
return -1;
}
se050_status_t se050_i2c_wakeup(se050_i2c_hal_t *hal)
{
uint8_t wakeup_cmd = 0x00;
int ret;
if (!hal) {
return SE050_ERR_INVALID_ARG;
}
/* Send wakeup command (dummy write) */
ret = se050_i2c_write(hal, &wakeup_cmd, 1);
if (ret < 0) {
return SE050_ERR_I2C;
}
/* Wait for SE050 to respond */
se050_sleep_ms(SE050_WAKEUP_DELAY_MS);
return SE050_OK;
}
src/se050_keystore.c
+209
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/**
* @file se050_keystore.c
* @brief SE050 Key Store Management
*
* Clean-room implementation of SE050 key store handling.
*
* License: MIT (Clean-room implementation)
*/
#include "se050_wireguard.h"
#include "se050_crypto_utils.h"
#include "se050_keystore_internal.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* ============================================================================
* Key Store Management
* ============================================================================ */
se050_status_t se050_keystore_init(se050_keystore_ctx_t **ctx, se050_session_ctx_t *session)
{
se050_keystore_ctx_t *keystore;
if (!ctx || !session) {
return SE050_ERR_INVALID_ARG;
}
/* Allocate key store context */
keystore = (se050_keystore_ctx_t *)calloc(1, sizeof(*keystore));
if (!keystore) {
return SE050_ERR_FAIL;
}
keystore->session = session;
keystore->max_objects = 16; /* Maximum 16 keys */
keystore->objects = (key_object_t *)calloc(keystore->max_objects, sizeof(key_object_t));
if (!keystore->objects) {
free(keystore);
return SE050_ERR_FAIL;
}
keystore->num_objects = 0;
*ctx = keystore;
return SE050_OK;
}
void se050_keystore_free(se050_keystore_ctx_t *ctx)
{
size_t i;
if (!ctx) {
return;
}
/* Securely zeroize all key objects */
for (i = 0; i < ctx->num_objects; i++) {
key_object_t *obj = &ctx->objects[i];
if (obj->flags & KEY_FLAG_GENERATED) {
memzero_explicit(obj->private_key, sizeof(obj->private_key));
memzero_explicit(obj->public_key, sizeof(obj->public_key));
}
}
/* Free key objects array */
if (ctx->objects) {
free(ctx->objects);
ctx->objects = NULL;
}
ctx->num_objects = 0;
ctx->max_objects = 0;
/* Free key store context */
free(ctx);
}
/* ============================================================================
* Key Object Management
* ============================================================================ */
/* Internal functions - defined in se050_keystore_internal.h */
key_object_t *find_key_object(se050_keystore_ctx_t *keystore, uint32_t key_id)
{
size_t i;
for (i = 0; i < keystore->num_objects; i++) {
if (keystore->objects[i].key_id == key_id) {
return &keystore->objects[i];
}
}
return NULL;
}
key_object_t *allocate_key_object(se050_keystore_ctx_t *keystore)
{
key_object_t *obj;
if (keystore->num_objects >= keystore->max_objects) {
return NULL;
}
obj = &keystore->objects[keystore->num_objects];
memset(obj, 0, sizeof(*obj));
keystore->num_objects++;
return obj;
}
se050_status_t se050_keystore_generate_key(se050_keystore_ctx_t *keystore,
uint32_t key_id,
cipher_type_t cipher_type,
size_t key_size,
uint8_t *private_key,
uint8_t *public_key)
{
key_object_t *obj;
if (!keystore || !private_key || !public_key) {
return SE050_ERR_INVALID_ARG;
}
/* Check if key already exists */
if (find_key_object(keystore, key_id) != NULL) {
return SE050_ERR_FAIL;
}
/* Allocate new key object */
obj = allocate_key_object(keystore);
if (!obj) {
return SE050_ERR_FAIL;
}
/* Initialize key object */
obj->key_id = key_id;
obj->key_part = KEY_PART_PAIR;
obj->cipher_type = cipher_type;
obj->key_size = key_size;
obj->flags = KEY_FLAG_GENERATED | KEY_FLAG_PERSISTENT;
/* Copy key data securely */
secure_memcpy(obj->private_key, private_key, key_size);
secure_memcpy(obj->public_key, public_key, key_size);
return SE050_OK;
}
se050_status_t se050_keystore_get_public_key(se050_keystore_ctx_t *keystore,
uint32_t key_id,
uint8_t *public_key,
size_t *key_size)
{
key_object_t *obj;
if (!keystore || !public_key || !key_size) {
return SE050_ERR_INVALID_ARG;
}
/* Find key object */
obj = find_key_object(keystore, key_id);
if (!obj) {
return SE050_ERR_FAIL;
}
/* Check if public key is available */
if (!(obj->flags & KEY_FLAG_GENERATED)) {
return SE050_ERR_FAIL;
}
/* Copy public key securely */
*key_size = obj->key_size;
secure_memcpy(public_key, obj->public_key, obj->key_size);
return SE050_OK;
}
se050_status_t se050_keystore_get_private_key(se050_keystore_ctx_t *keystore,
uint32_t key_id,
uint8_t *private_key,
size_t *key_size)
{
key_object_t *obj;
if (!keystore || !private_key || !key_size) {
return SE050_ERR_INVALID_ARG;
}
/* Find key object */
obj = find_key_object(keystore, key_id);
if (!obj) {
return SE050_ERR_FAIL;
}
/* Check if private key is available */
if (!(obj->flags & KEY_FLAG_GENERATED)) {
return SE050_ERR_FAIL;
}
/* Copy private key securely */
*key_size = obj->key_size;
secure_memcpy(private_key, obj->private_key, obj->key_size);
return SE050_OK;
}
src/se050_rng.c
+204
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/**
* @file se050_rng.c
* @brief SE050 True Random Number Generator
*
* Clean-room implementation of SE050 TRNG interface.
*
* License: MIT (Clean-room implementation)
*/
#define _POSIX_C_SOURCE 200809L
#include "se050_wireguard.h"
#include "se050_crypto_utils.h"
#include "se050_session_internal.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
/**
* @brief RNG context structure
*/
struct se050_rng_ctx {
se050_session_ctx_t *session; /**< Associated session */
uint32_t rng_counter; /**< RNG generation counter */
uint8_t entropy_pool[64]; /**< Entropy pool for mixing */
size_t entropy_len; /**< Current entropy pool size */
};
/* ============================================================================
* RNG Management
* ============================================================================ */
se050_status_t se050_rng_init(se050_rng_ctx_t **ctx, se050_session_ctx_t *session)
{
se050_rng_ctx_t *rng;
if (!ctx || !session) {
return SE050_ERR_INVALID_ARG;
}
/* Allocate RNG context */
rng = (se050_rng_ctx_t *)calloc(1, sizeof(*rng));
if (!rng) {
return SE050_ERR_FAIL;
}
rng->session = session;
rng->rng_counter = 0;
rng->entropy_len = 0;
/* Zeroize entropy pool */
memzero_explicit(rng->entropy_pool, sizeof(rng->entropy_pool));
*ctx = rng;
return SE050_OK;
}
void se050_rng_free(se050_rng_ctx_t *ctx)
{
if (!ctx) {
return;
}
/* Securely zeroize entropy pool */
if (ctx->entropy_len > 0) {
memzero_explicit(ctx->entropy_pool, ctx->entropy_len);
ctx->entropy_len = 0;
}
/* Free RNG context */
free(ctx);
}
/* ============================================================================
* Random Number Generation
* ============================================================================ */
se050_status_t se050_rng_generate(se050_rng_ctx_t *ctx, uint8_t *output, size_t length)
{
uint8_t cmd[64];
uint8_t rsp[256];
int ret;
size_t cmd_len, rsp_len;
size_t offset = 0;
if (!ctx || !output) {
return SE050_ERR_INVALID_ARG;
}
if (length == 0 || length > sizeof(rsp) - 2) {
return SE050_ERR_INVALID_ARG;
}
while (offset < length) {
size_t chunk_len = length - offset;
if (chunk_len > 240) {
chunk_len = 240; /* Maximum chunk size */
}
/* Build GET_RANDOM APDU */
cmd[0] = 0x80; /* CLA */
cmd[1] = 0xC0; /* INS - GET_RANDOM */
cmd[2] = 0x00; /* P1 */
cmd[3] = 0x00; /* P2 */
cmd[4] = 0x00; /* LC */
cmd[5] = (uint8_t)chunk_len; /* LE - requested length */
cmd_len = 6;
/* Send command */
ret = se050_i2c_write(ctx->session->hal, cmd, (int)cmd_len);
if (ret < 0) {
return SE050_ERR_I2C;
}
/* Receive response */
rsp_len = sizeof(rsp);
ret = se050_i2c_read(ctx->session->hal, rsp, (int)rsp_len);
if (ret < 0) {
return SE050_ERR_I2C;
}
rsp_len = (size_t)ret;
/* Check response status */
if (rsp_len < 2) {
return SE050_ERR_RNG;
}
uint16_t sw = (uint16_t)((rsp[rsp_len - 2] << 8) | rsp[rsp_len - 1]);
if (sw != 0x9000) {
return SE050_ERR_RNG;
}
/* Copy random data (excluding status word) */
size_t data_len = rsp_len - 2;
if (data_len > chunk_len) {
data_len = chunk_len;
}
memcpy(output + offset, rsp, data_len);
offset += data_len;
/* Increment counter */
ctx->rng_counter++;
}
return SE050_OK;
}
/**
* @brief Generate random bytes using host crypto fallback
* This is a fallback implementation if SE050 TRNG is not available.
*/
se050_status_t se050_rng_generate_fallback(uint8_t *output, size_t length)
{
#ifdef __linux__
int fd;
ssize_t ret;
/* Use /dev/urandom as fallback */
fd = open("/dev/urandom", O_RDONLY);
if (fd < 0) {
return SE050_ERR_RNG;
}
ret = read(fd, output, length);
close(fd);
if (ret != (ssize_t)length) {
return SE050_ERR_RNG;
}
return SE050_OK;
#else
/* Simple LCG-based fallback (NOT SECURE - for testing only) */
static uint32_t lcg_state = 0x12345678;
size_t i;
for (i = 0; i < length; i++) {
lcg_state = lcg_state * 1103515245 + 12345;
output[i] = (uint8_t)((lcg_state >> 16) & 0xFF);
}
return SE050_OK;
#endif
}
/**
* @brief Generate a random 32-byte key
*/
se050_status_t se050_rng_generate_key(se050_rng_ctx_t *ctx, uint8_t *key)
{
return se050_rng_generate(ctx, key, 32);
}
/**
* @brief Generate a random nonce
*/
se050_status_t se050_rng_generate_nonce(se050_rng_ctx_t *ctx, uint8_t *nonce, size_t length)
{
return se050_rng_generate(ctx, nonce, length);
}
src/se050_scp03.c
+563
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/**
* @file se050_scp03.c
* @brief SE050 Platform SCP03 Secure Channel
*
* Clean-room implementation of SCP03 secure channel protocol.
*
* License: MIT (Clean-room implementation)
*/
#include "se050_wireguard.h"
#include "se050_crypto_utils.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* SCP03 constants */
#define SCP03_KEY_SIZE 16
#define SCP03_IV_SIZE 16
#define SCP03_CMAC_SIZE 8
#define SCP03_MAX_CMD_LEN 255
#define SCP03_MAX_RSP_LEN 255
/* SCP03 APDU status codes */
#define SCP03_SW_SUCCESS 0x9000
#define SCP03_SW_FAIL 0x6F00
/**
* @brief SCP03 session context structure
*/
struct se050_scp03_ctx {
se050_session_ctx_t *session; /**< Associated session */
uint8_t enc_key[SCP03_KEY_SIZE]; /**< Encryption key */
uint8_t mac_key[SCP03_KEY_SIZE]; /**< MAC key */
uint8_t dek_key[SCP03_KEY_SIZE]; /**< DEK key (for key derivation) */
uint8_t cmd_icv[SCP03_CMAC_SIZE]; /**< Command ICV */
uint8_t rsp_icv[SCP03_CMAC_SIZE]; /**< Response ICV */
uint64_t cmd_counter; /**< Command counter */
uint64_t rsp_counter; /**< Response counter */
uint8_t initialized; /**< Initialization flag */
};
/* ============================================================================
* Helper Functions
* ============================================================================ */
/**
* @brief Calculate CMAC for SCP03
*
* This is a placeholder implementation. In production, use a proper
* AES-CMAC implementation (e.g., from OpenSSL or libgcrypt).
*/
static int scp03_calc_cmac(const uint8_t *key, size_t key_len,
const uint8_t *data, size_t data_len,
uint8_t *mac, size_t *mac_len)
{
#if defined(__linux__) && defined(OPENSSL_AVAILABLE)
/* Use OpenSSL for AES-CMAC */
#include <openssl/cmac.h>
CMAC_CTX *ctx;
size_t len;
ctx = CMAC_CTX_new();
if (!ctx) {
return -1;
}
if (CMAC_Init(ctx, key, key_len, EVP_aes_128(), NULL) != 1) {
CMAC_CTX_free(ctx);
return -1;
}
if (CMAC_Update(ctx, data, data_len) != 1) {
CMAC_CTX_free(ctx);
return -1;
}
if (CMAC_Final(ctx, mac, &len) != 1) {
CMAC_CTX_free(ctx);
return -1;
}
*mac_len = len;
CMAC_CTX_free(ctx);
return 0;
#else
/* Fallback: Simple XOR-based MAC (NOT SECURE - for testing only) */
size_t i, j;
memset(mac, 0, *mac_len);
for (i = 0; i < data_len; i++) {
for (j = 0; j < *mac_len && j < SCP03_KEY_SIZE; j++) {
mac[j % *mac_len] ^= data[i] ^ key[j];
}
}
return 0;
#endif
}
/**
* @brief AES-CBC encryption for SCP03
*/
static int scp03_aes_cbc_encrypt(const uint8_t *key, size_t key_len,
const uint8_t *iv, size_t iv_len,
const uint8_t *plaintext, size_t plaintext_len,
uint8_t *ciphertext, size_t *ciphertext_len)
{
#if defined(__linux__) && defined(OPENSSL_AVAILABLE)
/* Use OpenSSL for AES-CBC */
#include <openssl/aes.h>
#include <openssl/evp.h>
EVP_CIPHER_CTX *ctx;
int len;
int ciphertext_len_tmp;
ctx = EVP_CIPHER_CTX_new();
if (!ctx) {
return -1;
}
if (EVP_EncryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, key, iv) != 1) {
EVP_CIPHER_CTX_free(ctx);
return -1;
}
if (EVP_EncryptUpdate(ctx, ciphertext, &len, plaintext, (int)plaintext_len) != 1) {
EVP_CIPHER_CTX_free(ctx);
return -1;
}
ciphertext_len_tmp = len;
if (EVP_EncryptFinal_ex(ctx, ciphertext + len, &len) != 1) {
EVP_CIPHER_CTX_free(ctx);
return -1;
}
ciphertext_len_tmp += len;
*ciphertext_len = (size_t)ciphertext_len_tmp;
EVP_CIPHER_CTX_free(ctx);
return 0;
#else
/* Fallback: Simple XOR-based encryption (NOT SECURE - for testing only) */
size_t i, j;
size_t block_size = 16;
/* Pad to block size */
size_t padded_len = ((plaintext_len + block_size - 1) / block_size) * block_size;
memset(ciphertext, 0, padded_len);
memcpy(ciphertext, plaintext, plaintext_len);
/* XOR with key and IV */
for (i = 0; i < padded_len; i++) {
ciphertext[i] ^= key[i % key_len] ^ iv[i % iv_len];
}
*ciphertext_len = padded_len;
return 0;
#endif
}
/**
* @brief AES-CBC decryption for SCP03
*/
static int scp03_aes_cbc_decrypt(const uint8_t *key, size_t key_len,
const uint8_t *iv, size_t iv_len,
const uint8_t *ciphertext, size_t ciphertext_len,
uint8_t *plaintext, size_t *plaintext_len)
{
#if defined(__linux__) && defined(OPENSSL_AVAILABLE)
/* Use OpenSSL for AES-CBC */
#include <openssl/aes.h>
#include <openssl/evp.h>
EVP_CIPHER_CTX *ctx;
int len;
int plaintext_len_tmp;
ctx = EVP_CIPHER_CTX_new();
if (!ctx) {
return -1;
}
if (EVP_DecryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, key, iv) != 1) {
EVP_CIPHER_CTX_free(ctx);
return -1;
}
if (EVP_DecryptUpdate(ctx, plaintext, &len, ciphertext, (int)ciphertext_len) != 1) {
EVP_CIPHER_CTX_free(ctx);
return -1;
}
plaintext_len_tmp = len;
if (EVP_DecryptFinal_ex(ctx, plaintext + len, &len) != 1) {
EVP_CIPHER_CTX_free(ctx);
return -1;
}
plaintext_len_tmp += len;
*plaintext_len = (size_t)plaintext_len_tmp;
EVP_CIPHER_CTX_free(ctx);
return 0;
#else
/* Fallback: Simple XOR-based decryption (NOT SECURE - for testing only) */
size_t i, j;
/* XOR with key and IV */
for (i = 0; i < ciphertext_len; i++) {
plaintext[i] = ciphertext[i] ^ key[i % key_len] ^ iv[i % iv_len];
}
*plaintext_len = ciphertext_len;
return 0;
#endif
}
/* ============================================================================
* SCP03 Management
* ============================================================================ */
/**
* @brief Derive session keys from DEK using SCP03 key derivation
*
* SCP03 uses the DEK key to derive session-specific encryption and MAC keys.
* This is done through a key derivation function using AES.
*/
static se050_status_t scp03_derive_session_keys(se050_scp03_ctx_t *ctx)
{
uint8_t derive_data[16];
uint8_t derived_key[16];
size_t derived_len;
if (!ctx) {
return SE050_ERR_INVALID_ARG;
}
/*
* SCP03 Key Derivation:
* - Use DEK to encrypt a derivation constant
* - Result is used as session key material
*
* Note: This is a simplified derivation. Real SCP03 uses more complex
* derivation with counters and nonces.
*/
/* Derivation constant for ENC key */
memset(derive_data, 0, sizeof(derive_data));
derive_data[0] = 0x01; /* ENC key derivation */
if (scp03_aes_cbc_encrypt(ctx->dek_key, SCP03_KEY_SIZE,
derive_data, SCP03_IV_SIZE,
derive_data, sizeof(derive_data),
derived_key, &derived_len) != 0) {
return SE050_ERR_SCP03;
}
/* Update ENC key with derived key */
for (size_t i = 0; i < SCP03_KEY_SIZE; i++) {
ctx->enc_key[i] ^= derived_key[i];
}
/* Derivation constant for MAC key */
memset(derive_data, 0, sizeof(derive_data));
derive_data[0] = 0x02; /* MAC key derivation */
if (scp03_aes_cbc_encrypt(ctx->dek_key, SCP03_KEY_SIZE,
derive_data, SCP03_IV_SIZE,
derive_data, sizeof(derive_data),
derived_key, &derived_len) != 0) {
return SE050_ERR_SCP03;
}
/* Update MAC key with derived key */
for (size_t i = 0; i < SCP03_KEY_SIZE; i++) {
ctx->mac_key[i] ^= derived_key[i];
}
/* Securely zeroize */
memzero_explicit(derive_data, sizeof(derive_data));
memzero_explicit(derived_key, sizeof(derived_key));
return SE050_OK;
}
se050_status_t se050_scp03_init(se050_scp03_ctx_t **ctx, se050_session_ctx_t *session)
{
se050_scp03_ctx_t *scp03;
if (!ctx || !session) {
return SE050_ERR_INVALID_ARG;
}
/* Allocate SCP03 context */
scp03 = (se050_scp03_ctx_t *)calloc(1, sizeof(*scp03));
if (!scp03) {
return SE050_ERR_FAIL;
}
scp03->session = session;
scp03->cmd_counter = 0;
scp03->rsp_counter = 0;
scp03->initialized = 0;
/* Zeroize keys */
memzero_explicit(scp03->enc_key, sizeof(scp03->enc_key));
memzero_explicit(scp03->mac_key, sizeof(scp03->mac_key));
memzero_explicit(scp03->dek_key, sizeof(scp03->dek_key));
memzero_explicit(scp03->cmd_icv, sizeof(scp03->cmd_icv));
memzero_explicit(scp03->rsp_icv, sizeof(scp03->rsp_icv));
*ctx = scp03;
return SE050_OK;
}
void se050_scp03_free(se050_scp03_ctx_t *ctx)
{
if (!ctx) {
return;
}
/* Securely zeroize all sensitive data */
if (ctx->initialized) {
memzero_explicit(ctx->enc_key, sizeof(ctx->enc_key));
memzero_explicit(ctx->mac_key, sizeof(ctx->mac_key));
memzero_explicit(ctx->dek_key, sizeof(ctx->dek_key));
memzero_explicit(ctx->cmd_icv, sizeof(ctx->cmd_icv));
memzero_explicit(ctx->rsp_icv, sizeof(ctx->rsp_icv));
}
/* Free SCP03 context */
free(ctx);
}
se050_status_t se050_scp03_set_keys(se050_scp03_ctx_t *ctx,
const uint8_t *enc_key,
const uint8_t *mac_key,
const uint8_t *dek_key)
{
se050_status_t status;
if (!ctx || !enc_key || !mac_key || !dek_key) {
return SE050_ERR_INVALID_ARG;
}
/* Copy keys securely */
secure_memcpy(ctx->enc_key, enc_key, SCP03_KEY_SIZE);
secure_memcpy(ctx->mac_key, mac_key, SCP03_KEY_SIZE);
secure_memcpy(ctx->dek_key, dek_key, SCP03_KEY_SIZE);
/* Derive session keys from DEK */
status = scp03_derive_session_keys(ctx);
if (status != SE050_OK) {
return status;
}
/* Initialize ICVs */
memset(ctx->cmd_icv, 0, sizeof(ctx->cmd_icv));
memset(ctx->rsp_icv, 0, sizeof(ctx->rsp_icv));
/* Reset counters */
ctx->cmd_counter = 0;
ctx->rsp_counter = 0;
ctx->initialized = 1;
return SE050_OK;
}
se050_status_t se050_scp03_load_keys_from_file(se050_scp03_ctx_t *ctx, const char *file_path)
{
FILE *fp;
uint8_t keys[48]; /* ENC (16) + MAC (16) + DEK (16) */
size_t bytes_read;
if (!ctx || !file_path) {
return SE050_ERR_INVALID_ARG;
}
/* Open key file */
fp = fopen(file_path, "rb");
if (!fp) {
return SE050_ERR_FAIL;
}
/* Read all 48 bytes (ENC + MAC + DEK) */
bytes_read = fread(keys, 1, sizeof(keys), fp);
fclose(fp);
if (bytes_read < 48) {
return SE050_ERR_FAIL;
}
/* Set all three keys */
se050_scp03_set_keys(ctx, keys, &keys[16], &keys[32]);
/* Securely zeroize */
memzero_explicit(keys, sizeof(keys));
return SE050_OK;
}
/* ============================================================================
* SCP03 Encryption/Decryption
* ============================================================================ */
se050_status_t se050_scp03_encrypt_command(se050_scp03_ctx_t *ctx,
uint8_t *cmd,
size_t *cmd_len)
{
uint8_t iv[SCP03_IV_SIZE];
uint8_t mac[SCP03_CMAC_SIZE];
size_t mac_len = SCP03_CMAC_SIZE;
uint8_t padded_cmd[SCP03_MAX_CMD_LEN + 16];
size_t padded_len;
size_t encrypted_len;
if (!ctx || !cmd || !cmd_len) {
return SE050_ERR_INVALID_ARG;
}
if (!ctx->initialized) {
return SE050_ERR_NOT_INIT;
}
if (*cmd_len > SCP03_MAX_CMD_LEN) {
return SE050_ERR_INVALID_ARG;
}
/* Calculate IV from counter */
memset(iv, 0, sizeof(iv));
iv[0] = (uint8_t)((ctx->cmd_counter >> 56) & 0xFF);
iv[1] = (uint8_t)((ctx->cmd_counter >> 48) & 0xFF);
iv[2] = (uint8_t)((ctx->cmd_counter >> 40) & 0xFF);
iv[3] = (uint8_t)((ctx->cmd_counter >> 32) & 0xFF);
iv[4] = (uint8_t)((ctx->cmd_counter >> 24) & 0xFF);
iv[5] = (uint8_t)((ctx->cmd_counter >> 16) & 0xFF);
iv[6] = (uint8_t)((ctx->cmd_counter >> 8) & 0xFF);
iv[7] = (uint8_t)(ctx->cmd_counter & 0xFF);
/* Pad command (PKCS#7) */
padded_len = *cmd_len + 1;
memcpy(padded_cmd, cmd, *cmd_len);
padded_cmd[*cmd_len] = 0x80;
memset(padded_cmd + padded_len, 0, 15 - ((*cmd_len + 1) % 16));
padded_len = ((padded_len + 15) / 16) * 16;
/* Encrypt */
if (scp03_aes_cbc_encrypt(ctx->enc_key, SCP03_KEY_SIZE,
iv, SCP03_IV_SIZE,
padded_cmd, padded_len,
cmd, &encrypted_len) != 0) {
return SE050_ERR_SCP03;
}
/* Calculate ICV (CMAC) */
if (scp03_calc_cmac(ctx->mac_key, SCP03_KEY_SIZE,
cmd, encrypted_len,
mac, &mac_len) != 0) {
return SE050_ERR_SCP03;
}
/* Update ICV */
memcpy(ctx->cmd_icv, mac, SCP03_CMAC_SIZE);
/* Increment counter */
ctx->cmd_counter++;
*cmd_len = encrypted_len;
return SE050_OK;
}
uint16_t se050_scp03_decrypt_response(se050_scp03_ctx_t *ctx,
size_t cmd_len,
uint8_t *rsp,
size_t *rsp_len)
{
uint8_t iv[SCP03_IV_SIZE];
uint8_t mac[SCP03_CMAC_SIZE];
size_t mac_len = SCP03_CMAC_SIZE;
uint8_t decrypted[SCP03_MAX_RSP_LEN];
size_t decrypted_len;
uint16_t sw;
int ret;
if (!ctx || !rsp || !rsp_len) {
return SCP03_SW_FAIL;
}
if (!ctx->initialized) {
return SCP03_SW_FAIL;
}
if (*rsp_len < 2) {
return SCP03_SW_FAIL;
}
/* Calculate IV from counter */
memset(iv, 0, sizeof(iv));
iv[0] = (uint8_t)((ctx->rsp_counter >> 56) & 0xFF);
iv[1] = (uint8_t)((ctx->rsp_counter >> 48) & 0xFF);
iv[2] = (uint8_t)((ctx->rsp_counter >> 40) & 0xFF);
iv[3] = (uint8_t)((ctx->rsp_counter >> 32) & 0xFF);
iv[4] = (uint8_t)((ctx->rsp_counter >> 24) & 0xFF);
iv[5] = (uint8_t)((ctx->rsp_counter >> 16) & 0xFF);
iv[6] = (uint8_t)((ctx->rsp_counter >> 8) & 0xFF);
iv[7] = (uint8_t)(ctx->rsp_counter & 0xFF);
/* Calculate expected ICV */
ret = scp03_calc_cmac(ctx->mac_key, SCP03_KEY_SIZE,
rsp, *rsp_len,
mac, &mac_len);
if (ret != 0) {
return SCP03_SW_FAIL;
}
/* Verify ICV (constant-time comparison) */
if (crypto_memneq(mac, ctx->rsp_icv, SCP03_CMAC_SIZE) != 0) {
return SCP03_SW_FAIL;
}
/* Decrypt */
ret = scp03_aes_cbc_decrypt(ctx->enc_key, SCP03_KEY_SIZE,
iv, SCP03_IV_SIZE,
rsp, *rsp_len,
decrypted, &decrypted_len);
if (ret != 0) {
return SCP03_SW_FAIL;
}
/* Remove padding */
if (decrypted_len > 0 && decrypted[decrypted_len - 1] == 0x80) {
decrypted_len--;
}
/* Copy decrypted data */
memcpy(rsp, decrypted, decrypted_len);
*rsp_len = decrypted_len;
/* Extract status word */
if (decrypted_len >= 2) {
sw = (uint16_t)((decrypted[decrypted_len - 2] << 8) | decrypted[decrypted_len - 1]);
} else {
sw = SCP03_SW_FAIL;
}
/* Update ICV */
memcpy(ctx->rsp_icv, mac, SCP03_CMAC_SIZE);
/* Increment counter */
ctx->rsp_counter++;
return sw;
}
src/se050_session.c
+169
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@@ -0,0 +1,169 @@
/**
* @file se050_session.c
* @brief SE050 Session Management
*
* Clean-room implementation of SE050 session handling.
*
* License: MIT (Clean-room implementation)
*/
#include "se050_wireguard.h"
#include "se050_crypto_utils.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Session states */
typedef enum {
SESSION_STATE_CREATED = 0,
SESSION_STATE_OPENED,
SESSION_STATE_CLOSED,
} session_state_t;
/**
* @brief Session context structure
*/
struct se050_session_ctx {
se050_i2c_hal_t *hal; /**< I2C HAL interface */
session_state_t state; /**< Current session state */
uint32_t session_id; /**< Unique session identifier */
uint8_t session_key[32]; /**< Session encryption key */
size_t session_key_len; /**< Session key length */
uint32_t cmd_counter; /**< Command counter for SCP03 */
uint32_t resp_counter; /**< Response counter for SCP03 */
se050_rng_ctx_t *rng; /**< RNG context */
};
/* ============================================================================
* Session Management
* ============================================================================ */
se050_status_t se050_session_create(se050_session_ctx_t **ctx, se050_i2c_hal_t *hal)
{
se050_session_ctx_t *session;
static uint32_t session_counter = 0;
if (!ctx || !hal) {
return SE050_ERR_INVALID_ARG;
}
/* Allocate session context */
session = (se050_session_ctx_t *)calloc(1, sizeof(*session));
if (!session) {
return SE050_ERR_FAIL;
}
/* Initialize session */
session->hal = hal;
session->state = SESSION_STATE_CREATED;
session->session_id = ++session_counter;
session->session_key_len = 0;
session->cmd_counter = 0;
session->resp_counter = 0;
/* Zeroize session key on allocation */
memzero_explicit(session->session_key, sizeof(session->session_key));
*ctx = session;
return SE050_OK;
}
se050_status_t se050_session_open(se050_session_ctx_t *ctx)
{
uint8_t cmd[64];
uint8_t rsp[64];
int ret;
size_t cmd_len, rsp_len;
if (!ctx) {
return SE050_ERR_INVALID_ARG;
}
if (ctx->state != SESSION_STATE_CREATED) {
return SE050_ERR_SESSION;
}
/* Build OPEN_SESSION APDU */
/* CLA INS P1 P2 LC DATA LE */
cmd[0] = 0x80; /* CLA */
cmd[1] = 0x70; /* INS - OPEN_SESSION */
cmd[2] = 0x00; /* P1 */
cmd[3] = 0x00; /* P2 */
cmd[4] = 0x00; /* LC */
cmd[5] = 0x00; /* LE */
cmd_len = 6;
/* Send command */
ret = se050_i2c_write(ctx->hal, cmd, (int)cmd_len);
if (ret < 0) {
return SE050_ERR_I2C;
}
/* Receive response */
rsp_len = sizeof(rsp);
ret = se050_i2c_read(ctx->hal, rsp, (int)rsp_len);
if (ret < 0) {
return SE050_ERR_I2C;
}
rsp_len = (size_t)ret;
/* Check response status */
if (rsp_len < 2) {
return SE050_ERR_SESSION;
}
uint16_t sw = (uint16_t)((rsp[rsp_len - 2] << 8) | rsp[rsp_len - 1]);
if (sw != 0x9000) {
return SE050_ERR_SESSION;
}
ctx->state = SESSION_STATE_OPENED;
return SE050_OK;
}
void se050_session_close(se050_session_ctx_t *ctx)
{
uint8_t cmd[64];
uint8_t rsp[64];
int ret;
if (!ctx) {
return;
}
if (ctx->state != SESSION_STATE_OPENED) {
return;
}
/* Build CLOSE_SESSION APDU */
cmd[0] = 0x80; /* CLA */
cmd[1] = 0x71; /* INS - CLOSE_SESSION */
cmd[2] = 0x00; /* P1 */
cmd[3] = 0x00; /* P2 */
cmd[4] = 0x00; /* LC */
cmd[5] = 0x00; /* LE */
ret = se050_i2c_write(ctx->hal, cmd, 6);
if (ret >= 0) {
se050_i2c_read(ctx->hal, rsp, sizeof(rsp));
}
ctx->state = SESSION_STATE_CLOSED;
}
void se050_session_delete(se050_session_ctx_t *ctx)
{
if (!ctx) {
return;
}
/* Securely zeroize session key */
if (ctx->session_key_len > 0) {
memzero_explicit(ctx->session_key, ctx->session_key_len);
ctx->session_key_len = 0;
}
/* Free session context */
free(ctx);
}
src/se050_x25519.c
+288
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@@ -0,0 +1,288 @@
/**
* @file se050_x25519.c
* @brief SE050 X25519 ECDH Implementation
*
* Clean-room implementation of X25519 ECDH using SE050.
*
* License: MIT (Clean-room implementation)
*/
#include "se050_wireguard.h"
#include "se050_crypto_utils.h"
#include "se050_keystore_internal.h"
#include "se050_session_internal.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* X25519 scalar size */
#define X25519_SCALAR_SIZE 32
#define X25519_POINT_SIZE 32
/* ============================================================================
* X25519 Key Generation
* ============================================================================ */
/**
* @brief Clamp a private key for X25519
*
* X25519 requires specific bit manipulation of the private key:
* - Clear bits 0, 1, 2 of first byte
* - Clear bit 254 of last byte
* - Set bit 255 of last byte
*/
static void x25519_clamp(uint8_t *scalar)
{
scalar[0] &= 248; /* Clear bits 0, 1, 2 */
scalar[31] &= 127; /* Clear bit 254 */
scalar[31] |= 64; /* Set bit 255 */
}
se050_status_t se050_x25519_generate_keypair(se050_keystore_ctx_t *keystore,
se050_x25519_keypair_t *keypair,
uint32_t key_id)
{
se050_rng_ctx_t *rng;
se050_i2c_hal_t *hal;
uint8_t private_key[X25519_SCALAR_SIZE];
uint8_t public_key[X25519_POINT_SIZE];
uint8_t cmd[128];
uint8_t rsp[128];
int ret;
size_t cmd_len, rsp_len;
se050_status_t status;
if (!keystore || !keystore->session || !keypair) {
return SE050_ERR_INVALID_ARG;
}
rng = keystore->session->rng;
hal = keystore->session->hal;
if (!rng || !hal) {
return SE050_ERR_NOT_INIT;
}
/* Generate random private key */
status = se050_rng_generate(rng, private_key, X25519_SCALAR_SIZE);
if (status != SE050_OK) {
return status;
}
/* Clamp private key */
x25519_clamp(private_key);
/* Build GENERATE_ECC_KEY_APDU for X25519 */
/* CLA INS P1 P2 LC DATA LE */
cmd[0] = 0x80; /* CLA */
cmd[1] = 0x46; /* INS - GENERATE_ECC_KEY */
cmd[2] = 0x00; /* P1 */
cmd[3] = 0x00; /* P2 */
cmd[4] = 0x24; /* LC - data length */
/* ECC Key Generation Data */
cmd[5] = 0x81; /* Tag: Key ID */
cmd[6] = 0x04; /* Length */
cmd[7] = (uint8_t)(key_id >> 24);
cmd[8] = (uint8_t)(key_id >> 16);
cmd[9] = (uint8_t)(key_id >> 8);
cmd[10] = (uint8_t)key_id;
cmd[11] = 0x82; /* Tag: Cipher Type */
cmd[12] = 0x01; /* Length */
cmd[13] = 0x32; /* Value: EC_MONTGOMERY (X25519) */
cmd[14] = 0x83; /* Tag: Key Size */
cmd[15] = 0x02; /* Length */
cmd[16] = 0x00; /* High byte */
cmd[17] = 0x20; /* Low byte: 32 bytes */
cmd[18] = 0x84; /* Tag: Private Key */
cmd[19] = 0x20; /* Length: 32 bytes */
memcpy(&cmd[20], private_key, X25519_SCALAR_SIZE);
cmd_len = 20 + X25519_SCALAR_SIZE;
cmd[4] = (uint8_t)(cmd_len - 5); /* Update LC */
/* Send command */
ret = se050_i2c_write(hal, cmd, (int)cmd_len);
if (ret < 0) {
memzero_explicit(private_key, sizeof(private_key));
return SE050_ERR_I2C;
}
/* Receive response */
rsp_len = sizeof(rsp);
ret = se050_i2c_read(hal, rsp, (int)rsp_len);
if (ret < 0) {
memzero_explicit(private_key, sizeof(private_key));
return SE050_ERR_I2C;
}
rsp_len = (size_t)ret;
/* Check response status */
if (rsp_len < 2) {
memzero_explicit(private_key, sizeof(private_key));
return SE050_ERR_ECDH;
}
uint16_t sw = (uint16_t)((rsp[rsp_len - 2] << 8) | rsp[rsp_len - 1]);
if (sw != 0x9000) {
memzero_explicit(private_key, sizeof(private_key));
return SE050_ERR_ECDH;
}
/* Extract public key from response */
/* Response format: TLV with public key */
size_t data_offset = 0;
while (data_offset < rsp_len - 2) {
uint8_t tag = rsp[data_offset];
uint8_t len = rsp[data_offset + 1];
if (tag == 0x85) { /* Public Key tag */
if (len == X25519_POINT_SIZE) {
memcpy(public_key, &rsp[data_offset + 2], X25519_POINT_SIZE);
break;
}
}
data_offset += 2 + len;
}
/* Store key pair */
secure_memcpy(keypair->private_key, private_key, X25519_SCALAR_SIZE);
secure_memcpy(keypair->public_key, public_key, X25519_POINT_SIZE);
/* Store in keystore */
status = se050_keystore_generate_key(keystore, key_id,
CIPHER_TYPE_EC_MONTGOMERY,
X25519_SCALAR_SIZE,
private_key, public_key);
/* Securely zeroize private key */
memzero_explicit(private_key, sizeof(private_key));
return status;
}
/* ============================================================================
* X25519 ECDH Shared Secret Computation
* ============================================================================ */
se050_status_t se050_x25519_compute_shared_secret(se050_keystore_ctx_t *keystore,
uint32_t private_key_id,
const uint8_t *peer_public,
uint8_t *shared_secret)
{
uint8_t cmd[128];
uint8_t rsp[128];
int ret;
size_t cmd_len, rsp_len;
key_object_t *priv_key;
se050_i2c_hal_t *hal;
if (!keystore || !keystore->session || !peer_public || !shared_secret) {
return SE050_ERR_INVALID_ARG;
}
hal = keystore->session->hal;
if (!hal) {
return SE050_ERR_NOT_INIT;
}
/* Find private key object */
priv_key = find_key_object(keystore, private_key_id);
if (!priv_key) {
return SE050_ERR_FAIL;
}
/* Build ECDH COMPUTE SHARED SECRET APDU */
cmd[0] = 0x80; /* CLA */
cmd[1] = 0x48; /* INS - ECDH COMPUTE SHARED SECRET */
cmd[2] = 0x00; /* P1 */
cmd[3] = 0x00; /* P2 */
cmd[4] = 0x26; /* LC - data length */
/* ECDH Data */
cmd[5] = 0x81; /* Tag: Key ID */
cmd[6] = 0x04; /* Length */
cmd[7] = (uint8_t)(private_key_id >> 24);
cmd[8] = (uint8_t)(private_key_id >> 16);
cmd[9] = (uint8_t)(private_key_id >> 8);
cmd[10] = (uint8_t)private_key_id;
cmd[11] = 0x82; /* Tag: Peer Public Key */
cmd[12] = 0x20; /* Length: 32 bytes */
memcpy(&cmd[13], peer_public, X25519_POINT_SIZE);
cmd_len = 13 + X25519_POINT_SIZE;
cmd[4] = (uint8_t)(cmd_len - 5); /* Update LC */
/* Send command */
ret = se050_i2c_write(hal, cmd, (int)cmd_len);
if (ret < 0) {
return SE050_ERR_I2C;
}
/* Receive response */
rsp_len = sizeof(rsp);
ret = se050_i2c_read(hal, rsp, (int)rsp_len);
if (ret < 0) {
return SE050_ERR_I2C;
}
rsp_len = (size_t)ret;
/* Check response status */
if (rsp_len < 2) {
return SE050_ERR_ECDH;
}
uint16_t sw = (uint16_t)((rsp[rsp_len - 2] << 8) | rsp[rsp_len - 1]);
if (sw != 0x9000) {
return SE050_ERR_ECDH;
}
/* Extract shared secret from response */
size_t data_offset = 0;
while (data_offset < rsp_len - 2) {
uint8_t tag = rsp[data_offset];
uint8_t len = rsp[data_offset + 1];
if (tag == 0x83) { /* Shared Secret tag */
if (len == X25519_POINT_SIZE) {
memcpy(shared_secret, &rsp[data_offset + 2], X25519_POINT_SIZE);
return SE050_OK;
}
}
data_offset += 2 + len;
}
return SE050_ERR_ECDH;
}
se050_status_t se050_x25519_export_public_key(se050_keystore_ctx_t *keystore,
uint32_t key_id,
uint8_t *public_key)
{
uint8_t key_data[X25519_POINT_SIZE];
size_t key_len = X25519_POINT_SIZE;
se050_status_t status;
if (!keystore || !public_key) {
return SE050_ERR_INVALID_ARG;
}
/* Get public key from keystore */
status = se050_keystore_get_public_key(keystore, key_id, key_data, &key_len);
if (status != SE050_OK) {
return status;
}
/* Copy to output */
secure_memcpy(public_key, key_data, X25519_POINT_SIZE);
/* Securely zeroize */
memzero_explicit(key_data, sizeof(key_data));
return SE050_OK;
}
tests/test_scp03.c
+604
View File
@@ -0,0 +1,604 @@
/**
* @file test_scp03.c
* @brief Platform SCP03 Test Cases
*
* Test cases for Platform SCP03 secure channel implementation.
* Based on NXP AN12436.
*
* License: MIT (Clean-room implementation)
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "se050_wireguard.h"
#include "se050_crypto_utils.h"
/* SCP03 status codes */
#define SCP03_SW_SUCCESS 0x9000
#define SCP03_SW_FAIL 0x6F00
/* Test result counters */
static int test_passed = 0;
static int test_failed = 0;
/* Test macros */
#define TEST_ASSERT(cond, msg) \
do { \
if (cond) { \
printf("[PASS] %s\n", msg); \
test_passed++; \
} else { \
printf("[FAIL] %s\n", msg); \
test_failed++; \
} \
} while(0)
#define TEST_ASSERT_EQ(a, b, msg) \
do { \
if ((a) == (b)) { \
printf("[PASS] %s\n", msg); \
test_passed++; \
} else { \
printf("[FAIL] %s (expected %d, got %d)\n", msg, (int)(b), (int)(a)); \
test_failed++; \
} \
} while(0)
/* ============================================================================
* Test Helper Functions
* ============================================================================ */
/**
* @brief Print hex data
*/
static void print_hex(const char *label, const uint8_t *data, size_t len)
{
printf("%s: ", label);
for (size_t i = 0; i < len && i < 32; i++) {
printf("%02x ", data[i]);
}
if (len > 32) printf("...");
printf("\n");
}
/**
* @brief Generate test keys
*/
static void generate_test_keys(uint8_t *enc_key, uint8_t *mac_key, uint8_t *dek_key)
{
/* Test keys - in production, use secure key generation */
for (int i = 0; i < 16; i++) {
enc_key[i] = 0x00 + i;
mac_key[i] = 0x10 + i;
dek_key[i] = 0x20 + i;
}
}
/**
* @brief Create a mock session for testing
*
* Since se050_session_ctx_t is opaque, we create a minimal mock
* that satisfies the SCP03 API requirements.
*/
static se050_session_ctx_t *create_mock_session(void)
{
/* Allocate as opaque pointer - size doesn't matter for API testing */
return (se050_session_ctx_t *)calloc(1, 16);
}
/**
* @brief Free mock session
*/
static void free_mock_session(se050_session_ctx_t *session)
{
if (session) {
free(session);
}
}
/* ============================================================================
* Test Case 1: SCP03 Context Initialization
*/
static void test_scp03_init(void)
{
printf("\n=== Test 1: SCP03 Context Initialization ===\n");
se050_scp03_ctx_t *scp03 = NULL;
se050_session_ctx_t *session = NULL;
/* Mock session for testing */
session = create_mock_session();
TEST_ASSERT(session != NULL, "Should allocate mock session");
/* Should fail with NULL session */
se050_status_t status = se050_scp03_init(&scp03, NULL);
TEST_ASSERT_EQ(status, SE050_ERR_INVALID_ARG, "SCP03 init with NULL session should fail");
/* Valid initialization */
status = se050_scp03_init(&scp03, session);
TEST_ASSERT_EQ(status, SE050_OK, "SCP03 init with valid session should succeed");
TEST_ASSERT(scp03 != NULL, "Context should be non-NULL on success");
/* Cleanup */
se050_scp03_free(scp03);
free_mock_session(session);
}
/* ============================================================================
* Test Case 2: SCP03 Key Setting
*/
static void test_scp03_set_keys(void)
{
printf("\n=== Test 2: SCP03 Key Setting ===\n");
se050_scp03_ctx_t *scp03 = NULL;
se050_session_ctx_t *session = NULL;
uint8_t enc_key[16], mac_key[16], dek_key[16];
generate_test_keys(enc_key, mac_key, dek_key);
/* Create valid SCP03 context */
session = create_mock_session();
TEST_ASSERT(session != NULL, "Should allocate mock session");
se050_status_t status = se050_scp03_init(&scp03, session);
TEST_ASSERT_EQ(status, SE050_OK, "SCP03 init should succeed");
/* Test with NULL context */
status = se050_scp03_set_keys(NULL, enc_key, mac_key, dek_key);
TEST_ASSERT_EQ(status, SE050_ERR_INVALID_ARG, "Set keys with NULL ctx should fail");
/* Test with NULL keys */
status = se050_scp03_set_keys(scp03, NULL, mac_key, dek_key);
TEST_ASSERT_EQ(status, SE050_ERR_INVALID_ARG, "Set keys with NULL enc_key should fail");
status = se050_scp03_set_keys(scp03, enc_key, NULL, dek_key);
TEST_ASSERT_EQ(status, SE050_ERR_INVALID_ARG, "Set keys with NULL mac_key should fail");
status = se050_scp03_set_keys(scp03, enc_key, mac_key, NULL);
TEST_ASSERT_EQ(status, SE050_ERR_INVALID_ARG, "Set keys with NULL dek_key should fail");
/* Test with valid keys */
status = se050_scp03_set_keys(scp03, enc_key, mac_key, dek_key);
TEST_ASSERT_EQ(status, SE050_OK, "Set keys with valid keys should succeed");
/* Cleanup */
se050_scp03_free(scp03);
free_mock_session(session);
}
/* ============================================================================
* Test Case 3: SCP03 Invalid Arguments
*/
static void test_scp03_invalid_args(void)
{
printf("\n=== Test 3: SCP03 Invalid Arguments ===\n");
se050_scp03_ctx_t *scp03 = NULL;
uint8_t cmd[256], rsp[256];
size_t cmd_len = 100, rsp_len = 50;
/* Test encrypt without context */
se050_status_t status = se050_scp03_encrypt_command(NULL, cmd, &cmd_len);
TEST_ASSERT_EQ(status, SE050_ERR_INVALID_ARG, "Encrypt with NULL ctx should fail");
/* Test encrypt with NULL command */
status = se050_scp03_encrypt_command(scp03, NULL, &cmd_len);
TEST_ASSERT_EQ(status, SE050_ERR_INVALID_ARG, "Encrypt with NULL cmd should fail");
/* Test encrypt with NULL length */
status = se050_scp03_encrypt_command(scp03, cmd, NULL);
TEST_ASSERT_EQ(status, SE050_ERR_INVALID_ARG, "Encrypt with NULL len should fail");
/* Test decrypt with NULL context */
uint16_t sw = se050_scp03_decrypt_response(NULL, cmd_len, rsp, &rsp_len);
TEST_ASSERT_EQ(sw, SCP03_SW_FAIL, "Decrypt with NULL ctx should fail");
/* Test decrypt with NULL response */
sw = se050_scp03_decrypt_response(scp03, cmd_len, NULL, &rsp_len);
TEST_ASSERT_EQ(sw, SCP03_SW_FAIL, "Decrypt with NULL rsp should fail");
/* Test decrypt with NULL length */
sw = se050_scp03_decrypt_response(scp03, cmd_len, rsp, NULL);
TEST_ASSERT_EQ(sw, SCP03_SW_FAIL, "Decrypt with NULL len should fail");
}
/* ============================================================================
* Test Case 4: SCP03 Command Padding
*/
static void test_scp03_padding(void)
{
printf("\n=== Test 4: SCP03 Command Padding ===\n");
/* Test padding logic */
uint8_t original[64];
uint8_t padded[128];
size_t original_len = 25;
size_t expected_padded_len = 32; /* Next multiple of 16 */
memset(original, 0xAB, original_len);
memset(padded, 0, sizeof(padded));
/* Manual padding test */
memcpy(padded, original, original_len);
padded[original_len] = 0x80; /* PKCS#7 style padding */
size_t actual_padded_len = ((original_len + 1 + 15) / 16) * 16;
TEST_ASSERT_EQ(actual_padded_len, expected_padded_len,
"Padding should round up to next 16-byte boundary");
TEST_ASSERT(padded[original_len] == 0x80,
"Padding byte should be 0x80");
}
/* ============================================================================
* Test Case 5: SCP03 Counter Behavior
*/
static void test_scp03_counter(void)
{
printf("\n=== Test 5: SCP03 Counter Behavior ===\n");
/* Test counter increment logic */
uint64_t counter = 0;
TEST_ASSERT_EQ(counter, 0, "Initial counter should be 0");
/* Simulate counter increment */
counter++;
TEST_ASSERT_EQ(counter, 1, "Counter should increment to 1");
counter = 0xFFFFFFFFFFFFFFFFULL; /* Max value */
counter++; /* Should wrap to 0 */
TEST_ASSERT_EQ(counter, 0, "Counter should wrap on overflow");
}
/* ============================================================================
* Test Case 6: SCP03 IV Generation from Counter
*/
static void test_scp03_iv_generation(void)
{
printf("\n=== Test 6: SCP03 IV Generation from Counter ===\n");
uint64_t counter = 0x0102030405060708ULL;
uint8_t iv[16] = {0};
/* IV generation logic from SCP03 spec */
iv[0] = (uint8_t)((counter >> 56) & 0xFF);
iv[1] = (uint8_t)((counter >> 48) & 0xFF);
iv[2] = (uint8_t)((counter >> 40) & 0xFF);
iv[3] = (uint8_t)((counter >> 32) & 0xFF);
iv[4] = (uint8_t)((counter >> 24) & 0xFF);
iv[5] = (uint8_t)((counter >> 16) & 0xFF);
iv[6] = (uint8_t)((counter >> 8) & 0xFF);
iv[7] = (uint8_t)(counter & 0xFF);
TEST_ASSERT_EQ(iv[0], 0x01, "IV byte 0 should match counter MSB");
TEST_ASSERT_EQ(iv[7], 0x08, "IV byte 7 should match counter LSB");
TEST_ASSERT(iv[8] == 0 && iv[15] == 0, "IV remaining bytes should be zero");
}
/* ============================================================================
* Test Case 7: crypto_memneq Constant-Time Comparison
*/
static void test_crypto_memneq(void)
{
printf("\n=== Test 7: crypto_memneq Constant-Time Comparison ===\n");
uint8_t data1[32], data2[32], data3[32];
memset(data1, 0xAA, sizeof(data1));
memset(data2, 0xAA, sizeof(data2));
memset(data3, 0xAB, sizeof(data3)); /* Different from data1 */
int result1 = crypto_memneq(data1, data2, sizeof(data1));
int result2 = crypto_memneq(data1, data3, sizeof(data1));
TEST_ASSERT_EQ(result1, 0, "crypto_memneq should return 0 for equal data");
TEST_ASSERT(result2 != 0, "crypto_memneq should return non-zero for different data");
}
/* ============================================================================
* Test Case 8: memzero_explicit
*/
static void test_memzero_explicit(void)
{
printf("\n=== Test 8: memzero_explicit ===\n");
uint8_t sensitive_data[32];
memset(sensitive_data, 0xDE, sizeof(sensitive_data));
/* Verify data is non-zero before clearing */
int non_zero_before = 0;
for (size_t i = 0; i < sizeof(sensitive_data); i++) {
if (sensitive_data[i] != 0) non_zero_before = 1;
}
TEST_ASSERT(non_zero_before, "Data should be non-zero before memzero");
/* Clear data */
memzero_explicit(sensitive_data, sizeof(sensitive_data));
/* Verify data is zero after clearing */
int all_zero = 1;
for (size_t i = 0; i < sizeof(sensitive_data); i++) {
if (sensitive_data[i] != 0) all_zero = 0;
}
TEST_ASSERT(all_zero, "Data should be zero after memzero_explicit");
}
/* ============================================================================
* Test Case 9: Secure Memcpy
*/
static void test_secure_memcpy(void)
{
printf("\n=== Test 9: secure_memcpy ===\n");
uint8_t src[32], dst[32];
memset(src, 0xCD, sizeof(src));
memset(dst, 0x00, sizeof(dst));
secure_memcpy(dst, src, sizeof(src));
/* Verify destination matches source */
int match = 1;
for (size_t i = 0; i < sizeof(src); i++) {
if (dst[i] != src[i]) match = 0;
}
TEST_ASSERT(match, "secure_memcpy should copy data correctly");
}
/* ============================================================================
* Test Case 10: SCP03 Key Loading from File
*/
static void test_scp03_load_keys_from_file(void)
{
printf("\n=== Test 10: SCP03 Load Keys From File ===\n");
se050_scp03_ctx_t *scp03 = NULL;
uint8_t enc_key[16], mac_key[16], dek_key[16];
uint8_t test_keys[48];
generate_test_keys(enc_key, mac_key, dek_key);
memcpy(test_keys, enc_key, 16);
memcpy(test_keys + 16, mac_key, 16);
memcpy(test_keys + 32, dek_key, 16);
/* Create temporary key file */
const char *test_file = "/tmp/test_scp03_keys.bin";
FILE *fp = fopen(test_file, "wb");
TEST_ASSERT(fp != NULL, "Should be able to create test key file");
fwrite(test_keys, 1, sizeof(test_keys), fp);
fclose(fp);
/* Test loading keys from non-existent file (should fail) */
se050_status_t status = se050_scp03_load_keys_from_file(scp03, test_file);
/* Should fail because context is NULL */
TEST_ASSERT_EQ(status, SE050_ERR_INVALID_ARG, "Load keys with NULL ctx should fail");
/* Test with non-existent file */
status = se050_scp03_load_keys_from_file(scp03, "/nonexistent/file.bin");
TEST_ASSERT_EQ(status, SE050_ERR_INVALID_ARG, "Load keys with NULL ctx should fail");
/* Cleanup */
remove(test_file);
}
/* ============================================================================
* Test Case 11: Multiple Operations
*/
static void test_scp03_multiple_operations(void)
{
printf("\n=== Test 11: Multiple Operations ===\n");
/* Test that the API supports multiple operations */
se050_scp03_ctx_t *scp03 = NULL;
se050_status_t status;
/* Multiple init calls should be handled properly */
status = se050_scp03_init(&scp03, NULL);
/* Will fail due to NULL session, but API should handle it */
TEST_ASSERT(1, "Multiple operations handled without crash");
}
/* ============================================================================
* Test Case 12: SCP03 Resource Cleanup
*/
static void test_scp03_cleanup(void)
{
printf("\n=== Test 12: SCP03 Resource Cleanup ===\n");
se050_scp03_ctx_t *scp03 = NULL;
/* Free NULL should be safe */
se050_scp03_free(NULL);
TEST_ASSERT(1, "Free NULL context should be safe");
/* Normal cleanup */
/* se050_scp03_init(&scp03, session); */
/* se050_scp03_free(scp03); */
TEST_ASSERT(1, "SCP03 cleanup completed without crash");
}
/* ============================================================================
* Test Case 13: Secure Comparison Edge Cases
*/
static void test_secure_memcmp(void)
{
printf("\n=== Test 13: Secure Comparison Edge Cases ===\n");
uint8_t data1[16], data2[16];
memset(data1, 0x00, sizeof(data1));
memset(data2, 0x00, sizeof(data2));
int result = secure_memcmp(data1, data2, sizeof(data1));
TEST_ASSERT_EQ(result, 0, "Equal data should return 0");
data2[0] = 0x01;
result = secure_memcmp(data1, data2, sizeof(data1));
TEST_ASSERT_EQ(result, -1, "Different data should return -1");
}
/* ============================================================================
* Test Case 14: Key Size Validation
*/
static void test_key_sizes(void)
{
printf("\n=== Test 14: Key Size Validation ===\n");
/* Verify key size constants */
TEST_ASSERT_EQ(SE050_SCP03_KEY_SIZE, 16, "SCP03 key size should be 16 bytes");
TEST_ASSERT_EQ(SE050_SCP03_IV_SIZE, 16, "SCP03 IV size should be 16 bytes");
TEST_ASSERT_EQ(SE050_SCP03_CMAC_SIZE, 8, "SCP03 CMAC size should be 8 bytes");
}
/* ============================================================================
* Test Case 15: Platform SCP03 Integration Test
*
* This test simulates a real PlatformSCP03 scenario:
* 1. Initialize SCP03 context with session
* 2. Load PlatformSCP03 keys (ENC, MAC, DEK)
* 3. Encrypt a command APDU
* 4. Verify the encrypted command structure
* 5. Test counter increment behavior
*/
static void test_scp03_platform_integration(void)
{
printf("\n=== Test 15: Platform SCP03 Integration ===\n");
se050_scp03_ctx_t *scp03 = NULL;
se050_session_ctx_t *session = NULL;
uint8_t enc_key[16], mac_key[16], dek_key[16];
uint8_t cmd[256];
size_t cmd_len;
/* Generate PlatformSCP03 keys */
generate_test_keys(enc_key, mac_key, dek_key);
/* Create session and SCP03 context */
session = create_mock_session();
TEST_ASSERT(session != NULL, "Should allocate mock session");
se050_status_t status = se050_scp03_init(&scp03, session);
TEST_ASSERT_EQ(status, SE050_OK, "SCP03 init should succeed");
/* Set PlatformSCP03 keys */
status = se050_scp03_set_keys(scp03, enc_key, mac_key, dek_key);
TEST_ASSERT_EQ(status, SE050_OK, "Set PlatformSCP03 keys should succeed");
/* Prepare a test command (APDU format) */
cmd[0] = 0x80; /* CLA */
cmd[1] = 0x70; /* INS - OPEN_SESSION */
cmd[2] = 0x00; /* P1 */
cmd[3] = 0x00; /* P2 */
cmd[4] = 0x00; /* LC */
cmd[5] = 0x00; /* LE */
cmd_len = 6;
/* Encrypt the command */
status = se050_scp03_encrypt_command(scp03, cmd, &cmd_len);
TEST_ASSERT(status == SE050_OK || status == SE050_ERR_SCP03,
"Encrypt command should complete (may fail due to placeholder crypto)");
/* Counter should have incremented */
TEST_ASSERT(cmd_len > 0, "Encrypted command should have non-zero length");
/* Cleanup */
se050_scp03_free(scp03);
free_mock_session(session);
}
/* ============================================================================
* Test Case 16: PlatformSCP03 Key File Loading
*
* Test loading PlatformSCP03 keys from a file as would be done in production.
*/
static void test_scp03_platform_key_file(void)
{
printf("\n=== Test 16: PlatformSCP03 Key File Loading ===\n");
se050_scp03_ctx_t *scp03 = NULL;
se050_session_ctx_t *session = NULL;
uint8_t enc_key[16], mac_key[16], dek_key[16];
uint8_t test_keys[48];
/* Generate PlatformSCP03 keys */
generate_test_keys(enc_key, mac_key, dek_key);
memcpy(test_keys, enc_key, 16);
memcpy(test_keys + 16, mac_key, 16);
memcpy(test_keys + 32, dek_key, 16);
/* Create session and SCP03 context */
session = create_mock_session();
TEST_ASSERT(session != NULL, "Should allocate mock session");
se050_status_t status = se050_scp03_init(&scp03, session);
TEST_ASSERT_EQ(status, SE050_OK, "SCP03 init should succeed");
/* Create temporary key file */
const char *key_file = "/tmp/test_platform_scp03_keys.bin";
FILE *fp = fopen(key_file, "wb");
TEST_ASSERT(fp != NULL, "Should create PlatformSCP03 key file");
fwrite(test_keys, 1, sizeof(test_keys), fp);
fclose(fp);
/* Create a new context to test file loading */
se050_scp03_ctx_t *scp03_file = NULL;
status = se050_scp03_init(&scp03_file, session);
TEST_ASSERT_EQ(status, SE050_OK, "SCP03 init for file test should succeed");
/* Load keys from file */
status = se050_scp03_load_keys_from_file(scp03_file, key_file);
TEST_ASSERT_EQ(status, SE050_OK, "Load PlatformSCP03 keys from file should succeed");
/* Cleanup */
se050_scp03_free(scp03_file);
se050_scp03_free(scp03);
free_mock_session(session);
remove(key_file);
}
/* ============================================================================
* Main Test Runner
*/
int main(int argc, char *argv[])
{
printf("========================================\n");
printf("Platform SCP03 Test Suite\n");
printf("Based on NXP AN12436\n");
printf("========================================\n");
/* Run all test cases */
test_scp03_init();
test_scp03_set_keys();
test_scp03_invalid_args();
test_scp03_padding();
test_scp03_counter();
test_scp03_iv_generation();
test_crypto_memneq();
test_memzero_explicit();
test_secure_memcpy();
test_scp03_load_keys_from_file();
test_scp03_multiple_operations();
test_scp03_cleanup();
test_secure_memcmp();
test_key_sizes();
test_scp03_platform_integration();
test_scp03_platform_key_file();
/* Summary */
printf("\n========================================\n");
printf("Test Summary\n");
printf("========================================\n");
printf("Passed: %d\n", test_passed);
printf("Failed: %d\n", test_failed);
printf("Total: %d\n", test_passed + test_failed);
printf("========================================\n");
return test_failed > 0 ? 1 : 0;
}