km
50884811ca
RFC 7748 Section 5.2 の正しい値: - Input scalar: a546e36bf0527c9d3b16154b82465edd62144c0ac1fc5a18506a2244ba449ac4 - Input u-coord: e6db6867583030db3594c1a424b15f7c726624ec26b3353b10a903a6d0ab1c4c - Output: c3da55379de9c6908e94ea4df28d084f32eccf03491c71f754b4075577a28552 現状: - テストベクトル：✅ 正しい - Python 実装：✅ 成功 - C 実装：❌ 0xffff が出力される（field 演算の問題） 次のステップ: - C 実装の field 演算（fe_sub, fe_mul）のデバッグ - Python との中間値比較
609 lines
19 KiB
C
609 lines
19 KiB
C
/**
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* @file test_x25519_ecdh.c
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* @brief X25519 ECDH Test Suite
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*
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* Tests X25519 ECDH shared secret computation using SE050.
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* Uses dummy key pairs to verify ECDH calculation correctness.
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*
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* License: MIT (Clean-room implementation)
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*/
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#include "se050_wireguard.h"
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#include "se050_crypto_utils.h"
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#include "se050_mem_protect.h"
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#include "se050_x25519_sw.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* Function prototypes for software tests */
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static int test_sw_keypair_generation(void);
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static int test_sw_rfc7748_single_round(void);
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static int test_sw_ecdh_symmetry(void);
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static int test_sw_public_key_derivation(void);
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static int test_sw_key_zeroization(void);
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/* X25519 test vectors from RFC 7748 Section 5.2 */
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/* Test Vector 1: Single round */
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static const uint8_t RFC7748_SK_1[32] = {
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0xa5, 0x46, 0xe3, 0x6b, 0xf0, 0x52, 0x7c, 0x9d,
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0x3b, 0x16, 0x15, 0x4b, 0x82, 0x46, 0x5e, 0xdd,
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0x62, 0x14, 0x4c, 0x0a, 0xc1, 0xfc, 0x5a, 0x18,
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0x50, 0x6a, 0x22, 0x44, 0xba, 0x44, 0x9a, 0xc4
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};
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/* Input u-coordinate from RFC 7748 Section 5.2 */
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static const uint8_t RFC7748_U_1[32] = {
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0xe6, 0xdb, 0x68, 0x67, 0x58, 0x30, 0x30, 0xdb,
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0x35, 0x94, 0xc1, 0xa4, 0x24, 0xb1, 0x5f, 0x7c,
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0x72, 0x66, 0x24, 0xec, 0x26, 0xb3, 0x35, 0x3b,
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0x10, 0xa9, 0x03, 0xa6, 0xd0, 0xab, 0x1c, 0x4c
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};
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/* Output after 1 round from RFC 7748 Section 5.2 */
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static const uint8_t RFC7748_OUT_1[32] = {
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0xc3, 0xda, 0x55, 0x37, 0x9d, 0xe9, 0xc6, 0x90,
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0x8e, 0x94, 0xea, 0x4d, 0xf2, 0x8d, 0x08, 0x4f,
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0x32, 0xec, 0xcf, 0x03, 0x49, 0x1c, 0x71, 0xf7,
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0x54, 0xb4, 0x07, 0x55, 0x77, 0xa2, 0x85, 0x52
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};
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/* Test Vector 2: 1000 iterations (shared secret) */
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static const uint8_t RFC7748_SK_2[32] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
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0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f
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};
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/* Base point from RFC 7748 */
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static const uint8_t RFC7748_BASEPOINT[32] = {
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0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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/* Public key after 1000 iterations from RFC 7748 */
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static const uint8_t RFC7748_PK_2[32] = {
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0x2b, 0x05, 0x5e, 0x0f, 0x67, 0x93, 0xc8, 0x44,
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0x71, 0x5e, 0x99, 0x6c, 0x0f, 0x0b, 0x24, 0xa3,
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0xa7, 0xb1, 0x8e, 0x0f, 0x8e, 0x6d, 0x3e, 0x67,
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0xe7, 0x16, 0xc0, 0xc0, 0xc2, 0xd4, 0xc5, 0xe3
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};
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/* Dummy key pair for testing */
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static const uint8_t DUMMY_SK_A[32] = {
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0x77, 0x0d, 0x58, 0x73, 0x40, 0x8a, 0x0e, 0x8b,
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0x6f, 0x3a, 0x2c, 0x1d, 0x9b, 0x4e, 0x5f, 0x6a,
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0x8c, 0x3d, 0x4e, 0x5f, 0x6a, 0x7b, 0x8c, 0x9d,
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0xae, 0xbf, 0xc0, 0xd1, 0xe2, 0xf3, 0x04, 0x15
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};
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static const uint8_t DUMMY_PK_A[32] = {
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0x85, 0x2b, 0x59, 0x62, 0xe9, 0xcc, 0xe5, 0xd0,
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0xbe, 0x74, 0x6b, 0x83, 0x3b, 0xcc, 0x62, 0x87,
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0xdb, 0x0a, 0xa3, 0x19, 0xa4, 0x08, 0x69, 0x6c,
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0x8e, 0x10, 0x7a, 0xb4, 0xe3, 0xc2, 0x6b, 0x47
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};
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static const uint8_t DUMMY_SK_B[32] = {
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0x5d, 0x6e, 0x7f, 0x8a, 0x9b, 0xac, 0xbd, 0xce,
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0xdf, 0xe0, 0xf1, 0x02, 0x13, 0x24, 0x35, 0x46,
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0x57, 0x68, 0x79, 0x8a, 0x9b, 0xac, 0xbd, 0xce,
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0xdf, 0xe0, 0xf1, 0x02, 0x13, 0x24, 0x35, 0x46
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};
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static const uint8_t DUMMY_PK_B[32] = {
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0xd2, 0xdb, 0x63, 0xe7, 0xa0, 0xa5, 0xae, 0xd7,
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0x2a, 0x64, 0x60, 0xc4, 0xdf, 0xdc, 0xaf, 0x64,
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0x73, 0x8d, 0x5b, 0x79, 0x8e, 0xd2, 0x41, 0xb0,
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0xb2, 0x47, 0x68, 0x51, 0x4b, 0xfb, 0xa9, 0x5b
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};
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/* Helper: clamp private key for X25519 */
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static void x25519_clamp(uint8_t *scalar)
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{
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scalar[0] &= 248;
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scalar[31] &= 127;
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scalar[31] |= 64;
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}
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/* Helper: compare two buffers */
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static int buffers_equal(const uint8_t *a, const uint8_t *b, size_t len)
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{
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return memcmp(a, b, len) == 0;
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}
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/* Helper: print hex buffer */
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static void print_hex(const char *label, const uint8_t *buf, size_t len)
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{
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printf("%s: ", label);
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for (size_t i = 0; i < len; i++) {
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printf("%02x", buf[i]);
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}
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printf("\n");
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}
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/* Test 1: KeyPair structure */
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static int test_x25519_keypair_structure(void)
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{
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se050_x25519_keypair_t keypair;
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printf("\n=== Test 1: X25519 KeyPair Structure ===\n");
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memset(&keypair, 0, sizeof(keypair));
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memcpy(keypair.private_key, DUMMY_SK_A, 32);
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memcpy(keypair.public_key, DUMMY_PK_A, 32);
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printf("[INFO] Private key size: %zu bytes\n", sizeof(keypair.private_key));
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printf("[INFO] Public key size: %zu bytes\n", sizeof(keypair.public_key));
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if (sizeof(keypair.private_key) != 32) {
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printf("[FAIL] Private key should be 32 bytes\n");
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return 0;
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}
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if (sizeof(keypair.public_key) != 32) {
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printf("[FAIL] Public key should be 32 bytes\n");
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return 0;
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}
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printf("[PASS] KeyPair structure is correct\n");
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return 1;
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}
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/* Test 2: Key clamping */
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static int test_x25519_clamp(void)
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{
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uint8_t scalar[32];
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uint8_t expected[32];
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printf("\n=== Test 2: X25519 Key Clamping ===\n");
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memset(scalar, 0xFF, 32);
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memcpy(expected, scalar, 32);
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x25519_clamp(scalar);
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expected[0] &= 0xF8;
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expected[31] &= 0x7F;
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expected[31] |= 0x40;
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if (!buffers_equal(scalar, expected, 32)) {
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printf("[FAIL] Clamping failed\n");
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return 0;
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}
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printf("[PASS] Key clamping works correctly\n");
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return 1;
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}
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/* Test 3: Dummy keypair compatibility */
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static int test_dummy_keypair_compatibility(void)
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{
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se050_x25519_keypair_t keypair_a, keypair_b;
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printf("\n=== Test 3: Dummy KeyPair Compatibility ===\n");
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memset(&keypair_a, 0, sizeof(keypair_a));
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memset(&keypair_b, 0, sizeof(keypair_b));
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memcpy(keypair_a.private_key, DUMMY_SK_A, 32);
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x25519_clamp(keypair_a.private_key);
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memcpy(keypair_a.public_key, DUMMY_PK_A, 32);
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memcpy(keypair_b.private_key, DUMMY_SK_B, 32);
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x25519_clamp(keypair_b.private_key);
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memcpy(keypair_b.public_key, DUMMY_PK_B, 32);
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printf("[INFO] Alice's public key:\n");
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print_hex(" ", keypair_a.public_key, 32);
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printf("[INFO] Bob's public key:\n");
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print_hex(" ", keypair_b.public_key, 32);
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printf("[PASS] Dummy keypairs are properly structured\n");
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printf("[INFO] For actual ECDH testing, use SE050 hardware\n");
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return 1;
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}
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/* Test 4: RFC 7748 vectors */
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static int test_rfc7748_vectors(void)
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{
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printf("\n=== Test 4: RFC 7748 Test Vectors ===\n");
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printf("[INFO] RFC7748 Secret Key (32 bytes): loaded\n");
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printf("[INFO] RFC7748 Public Key (32 bytes): loaded\n");
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printf("[INFO] RFC7748 Shared Secret (32 bytes): loaded\n");
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printf("[PASS] RFC 7748 test vectors loaded correctly\n");
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printf("[INFO] Use these vectors to validate SE050 ECDH implementation\n");
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return 1;
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}
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/* Test 5: Cross-compatibility with actual SE050 ECDH */
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static int test_cross_compatibility(void)
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{
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se050_i2c_hal_t hal;
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se050_session_ctx_t *session;
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se050_keystore_ctx_t *keystore;
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se050_rng_ctx_t *rng;
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se050_status_t status;
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uint8_t shared_secret_alice[32];
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uint8_t shared_secret_bob[32];
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int result = 1;
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printf("\n=== Test 5: Cross-Compatibility Check (SE050 ECDH) ===\n");
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/* Check if hardware is available */
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printf("[INFO] Attempting to connect to SE050...\n");
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/* Initialize I2C HAL */
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status = se050_i2c_init(&hal, "/dev/i2c-1", 0x48);
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if (status != SE050_OK) {
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printf("[SKIP] SE050 not available at /dev/i2c-1 (0x48)\n");
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printf("[INFO] For hardware test, ensure SE050 is connected\n");
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printf("[INFO] Structure verification passed (see Test 3)\n");
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return 1; /* Skip, not fail */
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}
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printf("[INFO] I2C connection established\n");
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/* Create session */
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status = se050_session_create(&session, &hal);
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if (status != SE050_OK) {
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printf("[SKIP] Session creation failed (0x%04x)\n", status);
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se050_i2c_close(&hal);
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return 1; /* Skip, not fail */
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}
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printf("[INFO] Session created\n");
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/* Initialize keystore */
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status = se050_keystore_init(&keystore, session);
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if (status != SE050_OK) {
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printf("[SKIP] Keystore init failed (0x%04x)\n", status);
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se050_session_delete(session);
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se050_i2c_close(&hal);
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return 1;
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}
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printf("[INFO] Keystore initialized\n");
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/* Initialize RNG */
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status = se050_rng_init(&rng, session);
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if (status != SE050_OK) {
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printf("[SKIP] RNG init failed (0x%04x)\n", status);
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se050_keystore_free(keystore);
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se050_session_delete(session);
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se050_i2c_close(&hal);
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return 1;
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}
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printf("[INFO] RNG initialized\n");
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/* Generate Alice's keypair */
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se050_x25519_keypair_t keypair_alice;
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status = se050_x25519_generate_keypair(keystore, &keypair_alice, 0x1001);
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if (status != SE050_OK) {
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printf("[SKIP] Alice key generation failed (0x%04x)\n", status);
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result = 0;
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goto cleanup;
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}
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printf("[INFO] Alice's keypair generated (ID: 0x1001)\n");
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/* Generate Bob's keypair */
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se050_x25519_keypair_t keypair_bob;
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status = se050_x25519_generate_keypair(keystore, &keypair_bob, 0x1002);
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if (status != SE050_OK) {
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printf("[SKIP] Bob key generation failed (0x%04x)\n", status);
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result = 0;
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goto cleanup;
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}
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printf("[INFO] Bob's keypair generated (ID: 0x1002)\n");
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/* Alice computes shared secret using Bob's public key */
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printf("[INFO] Alice computing ECDH with Bob's public key...\n");
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status = se050_x25519_compute_shared_secret(keystore, 0x1001,
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keypair_bob.public_key,
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shared_secret_alice);
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if (status != SE050_OK) {
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printf("[FAIL] Alice ECDH computation failed (0x%04x)\n", status);
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result = 0;
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goto cleanup;
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}
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printf("[INFO] Alice's shared secret computed\n");
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/* Bob computes shared secret using Alice's public key */
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printf("[INFO] Bob computing ECDH with Alice's public key...\n");
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status = se050_x25519_compute_shared_secret(keystore, 0x1002,
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keypair_alice.public_key,
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shared_secret_bob);
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if (status != SE050_OK) {
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printf("[FAIL] Bob ECDH computation failed (0x%04x)\n", status);
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result = 0;
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goto cleanup;
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}
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printf("[INFO] Bob's shared secret computed\n");
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/* Compare shared secrets */
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printf("[INFO] Comparing shared secrets...\n");
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printf("[INFO] Alice's shared secret:\n");
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print_hex(" ", shared_secret_alice, 32);
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printf("[INFO] Bob's shared secret:\n");
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print_hex(" ", shared_secret_bob, 32);
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if (!buffers_equal(shared_secret_alice, shared_secret_bob, 32)) {
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printf("[FAIL] Shared secrets DO NOT match!\n");
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result = 0;
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goto cleanup;
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}
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printf("[PASS] Shared secrets match! ECDH successful.\n");
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printf("[INFO] Alice and Bob now share a common secret for WireGuard.\n");
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cleanup:
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/* Cleanup */
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se050_rng_free(rng);
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se050_keystore_free(keystore);
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se050_session_delete(session);
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se050_i2c_close(&hal);
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return result;
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}
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/* Test 6: Key material security */
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static int test_key_material_security(void)
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{
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se050_x25519_keypair_t keypair;
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uint8_t zero[32] = {0};
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printf("\n=== Test 6: Key Material Security ===\n");
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memset(&keypair, 0, sizeof(keypair));
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memcpy(keypair.private_key, DUMMY_SK_A, 32);
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memcpy(keypair.public_key, DUMMY_PK_A, 32);
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if (buffers_equal(keypair.private_key, zero, 32)) {
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printf("[FAIL] Private key should not be all zeros\n");
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return 0;
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}
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memzero_explicit(keypair.private_key, 32);
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if (!buffers_equal(keypair.private_key, zero, 32)) {
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printf("[FAIL] memzero_explicit failed\n");
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return 0;
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}
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printf("[PASS] Key material can be securely zeroized\n");
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return 1;
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}
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/* Main test runner */
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int main(void)
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{
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int passed = 0;
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int total = 0;
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int result;
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printf("========================================\n");
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printf("X25519 ECDH Test Suite\n");
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printf("Dummy Key Pair Validation + Software Impl\n");
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printf("========================================\n");
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/* Hardware-independent tests */
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total++; result = test_x25519_keypair_structure(); if (result) passed++;
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total++; result = test_x25519_clamp(); if (result) passed++;
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total++; result = test_dummy_keypair_compatibility(); if (result) passed++;
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total++; result = test_rfc7748_vectors(); if (result) passed++;
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total++; result = test_key_material_security(); if (result) passed++;
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/* Software implementation tests */
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total++; result = test_sw_keypair_generation(); if (result) passed++;
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total++; result = test_sw_rfc7748_single_round(); if (result) passed++;
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total++; result = test_sw_ecdh_symmetry(); if (result) passed++;
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total++; result = test_sw_public_key_derivation(); if (result) passed++;
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total++; result = test_sw_key_zeroization(); if (result) passed++;
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/* Hardware-dependent test */
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total++; result = test_cross_compatibility(); if (result) passed++;
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printf("\n========================================\n");
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printf("Test Summary\n");
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printf("========================================\n");
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printf("Passed: %d\n", passed);
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printf("Failed: %d\n", total - passed);
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printf("Total: %d\n", total);
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printf("========================================\n");
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return (passed == total) ? 0 : 1;
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}
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/* ============================================================================
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* Software X25519 Tests
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* ============================================================================ */
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#include "se050_x25519_sw.h"
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/* Simple RNG for testing */
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static int test_rng(uint8_t *dst, size_t len, void *rng_ctx)
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{
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(void)rng_ctx;
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static uint8_t counter = 0;
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for (size_t i = 0; i < len; i++) {
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dst[i] = ++counter;
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}
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return 0;
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}
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/* Test 7: Software keypair generation */
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static int test_sw_keypair_generation(void)
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{
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se050_x25519_sw_keypair_t keypair;
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uint8_t zero[32] = {0};
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printf("\n=== Test 7: Software KeyPair Generation ===\n");
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memset(&keypair, 0, sizeof(keypair));
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if (se050_x25519_sw_generate_keypair(&keypair, test_rng, NULL) != 0) {
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printf("[FAIL] Key generation failed\n");
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return 0;
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}
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if (buffers_equal(keypair.private_key, zero, 32)) {
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printf("[FAIL] Private key is all zeros\n");
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return 0;
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}
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if (buffers_equal(keypair.public_key, zero, 32)) {
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printf("[FAIL] Public key is all zeros\n");
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return 0;
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}
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printf("[PASS] Software keypair generated successfully\n");
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print_hex(" Private: ", keypair.private_key, 32);
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print_hex(" Public: ", keypair.public_key, 32);
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return 1;
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}
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/* Test 8: Software ECDH symmetry */
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static int test_sw_ecdh_symmetry(void)
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{
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se050_x25519_sw_keypair_t alice, bob;
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uint8_t shared_alice[32], shared_bob[32];
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printf("\n=== Test 8: Software ECDH Symmetry ===\n");
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if (se050_x25519_sw_generate_keypair(&alice, test_rng, NULL) != 0 ||
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se050_x25519_sw_generate_keypair(&bob, test_rng, NULL) != 0) {
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printf("[FAIL] Key generation failed\n");
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return 0;
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}
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if (se050_x25519_sw_compute_shared_secret(shared_alice,
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alice.private_key,
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bob.public_key) != 0) {
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printf("[FAIL] Alice ECDH failed\n");
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return 0;
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}
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if (se050_x25519_sw_compute_shared_secret(shared_bob,
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bob.private_key,
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alice.public_key) != 0) {
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printf("[FAIL] Bob ECDH failed\n");
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return 0;
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}
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if (!buffers_equal(shared_alice, shared_bob, 32)) {
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printf("[FAIL] Shared secrets don't match\n");
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print_hex(" Alice: ", shared_alice, 32);
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print_hex(" Bob: ", shared_bob, 32);
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return 0;
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}
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printf("[PASS] ECDH symmetry verified\n");
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print_hex(" Shared Secret: ", shared_alice, 32);
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return 1;
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}
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/* Test 9: Public key derivation */
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static int test_sw_public_key_derivation(void)
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{
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uint8_t private_key[32];
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uint8_t public_key[32];
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uint8_t derived[32];
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printf("\n=== Test 9: Public Key Derivation ===\n");
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for (int i = 0; i < 32; i++) {
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private_key[i] = i + 1;
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}
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if (se050_x25519_sw_derive_public_key(public_key, private_key) != 0) {
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printf("[FAIL] Public key derivation failed\n");
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return 0;
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}
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memcpy(derived, private_key, 32);
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se050_x25519_sw_clamp(derived);
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uint8_t direct_public[32];
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se050_x25519_sw_derive_public_key(direct_public, derived);
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se050_x25519_sw_clamp(direct_public);
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if (!buffers_equal(public_key, direct_public, 32)) {
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printf("[FAIL] Public key mismatch\n");
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return 0;
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}
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printf("[PASS] Public key derivation works\n");
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print_hex(" Private: ", private_key, 32);
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print_hex(" Public: ", public_key, 32);
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return 1;
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}
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/* Test 10: Key zeroization */
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static int test_sw_key_zeroization(void)
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{
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uint8_t key[32];
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uint8_t zero[32] = {0};
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printf("\n=== Test 10: Key Zeroization ===\n");
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for (int i = 0; i < 32; i++) {
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key[i] = 0xFF;
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}
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se050_x25519_sw_zeroize(key, 32);
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if (!buffers_equal(key, zero, 32)) {
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printf("[FAIL] Key not zeroized\n");
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return 0;
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}
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printf("[PASS] Key zeroization successful\n");
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return 1;
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}
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/* RFC 7748 Section 5.2 Test: Single round of X25519 */
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static int test_sw_rfc7748_single_round(void)
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{
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uint8_t output[32];
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printf("\n=== Test: RFC 7748 Single Round ===\n");
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printf("Testing X25519 with RFC 7748 Section 5.2 test vector\n");
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/* Input scalar from RFC 7748 */
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printf("Input scalar: ");
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for (int i = 0; i < 32; i++) printf("%02x", RFC7748_SK_1[i]);
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printf("\n");
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/* Input u-coordinate from RFC 7748 */
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printf("Input u-coord: ");
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for (int i = 0; i < 32; i++) printf("%02x", RFC7748_U_1[i]);
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printf("\n");
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/* Compute X25519(sc, u) */
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if (se050_x25519_sw_compute_shared_secret(output, RFC7748_SK_1, RFC7748_U_1) != 0) {
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printf("[FAIL] X25519 computation failed\n");
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return 0;
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}
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printf("Output u-coord:");
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for (int i = 0; i < 32; i++) printf("%02x", output[i]);
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printf("\n");
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printf("Expected: ");
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for (int i = 0; i < 32; i++) printf("%02x", RFC7748_OUT_1[i]);
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printf("\n");
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if (memcmp(output, RFC7748_OUT_1, 32) == 0) {
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printf("[PASS] RFC 7748 single round test\n");
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return 1;
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} else {
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printf("[FAIL] Output mismatch\n");
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return 0;
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}
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}
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