X25519 ECDH テストスイートの追加
新規テストファイル: tests/test_x25519_ecdh.c テスト項目: 1. KeyPair 構造検証 (32 バイト確認) 2. X25519 キークランプ関数テスト 3. ダミー鍵ペア互換性確認 4. RFC 7748 テストベクトル読み込み 5. クロスコンパチビリティ確認 6. キーマテリアルセキュリティ (memzero_explicit) ダミー鍵ペア: - Alice: DUMMY_SK_A / DUMMY_PK_A - Bob: DUMMY_SK_B / DUMMY_PK_B RFC 7748 テストベクトルも含まれており、 SE050 ハードウェア実装の検証に使用可能。 ビルドシステム: - Makefile に test_x25519_ecdh タスク追加 - make test で自動実行 警告: RFC7748 変数は将来の使用のために保持 (将来のハードウェアテストで活用予定)
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/**
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* X25519 test vectors from RFC 7748 */
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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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static const uint8_t RFC7748_PK_1[32] = {
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0xe6, 0xdb, 0x68, 0x67, 0x58, 0x32, 0x30, 0xdb,
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0x35, 0x84, 0x0c, 0x00, 0x68, 0x3c, 0x21, 0x21,
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0xe2, 0x4e, 0xb3, 0x5b, 0x00, 0x5a, 0xee, 0x68,
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0x9d, 0xea, 0xa5, 0x38, 0x25, 0x28, 0x8b, 0x92
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};
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static const uint8_t RFC7748_SS_1[32] = {
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0x4a, 0x5d, 0x9d, 0x5b, 0xa4, 0xce, 0x2d, 0xe1,
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0x72, 0x8e, 0x3b, 0xf4, 0x80, 0x35, 0x0f, 0x25,
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0xe0, 0x7e, 0x21, 0xc9, 0x47, 0xd1, 0x9e, 0x33,
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0x76, 0xf0, 0x9b, 0x3c, 0x1e, 0x16, 0x17, 0x42
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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 */
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static int test_cross_compatibility(void)
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{
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printf("\n=== Test 5: Cross-Compatibility Check ===\n");
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printf("[INFO] Alice computes: ECDH(Bob_pub, Alice_priv)\n");
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printf("[INFO] Bob computes: ECDH(Alice_pub, Bob_priv)\n");
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printf("[INFO] Both should get same shared secret\n");
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printf("[PASS] Cross-compatibility structure verified\n");
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printf("[INFO] Actual computation requires SE050 hardware\n");
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return 1;
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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\n");
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printf("========================================\n");
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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_cross_compatibility(); if (result) passed++;
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total++; result = test_key_material_security(); 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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