/* * Copyright 2014-2025 The GmSSL Project. All Rights Reserved. * * Licensed under the Apache License, Version 2.0 (the License); you may * not use this file except in compliance with the License. * * http://www.apache.org/licenses/LICENSE-2.0 */ #include #include #include #include #include #include static const uint8_t S[256] = { 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16, }; static const uint8_t S_inv[256] = { 0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb, 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e, 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25, 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92, 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84, 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06, 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, 0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73, 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e, 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b, 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4, 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f, 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef, 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61, 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d, }; static const uint8_t Rcon[11] = { 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, }; static uint32_t sub_word(uint32_t A) { return S[(A >> 24) & 0xff] << 24 | S[(A >> 16) & 0xff] << 16 | S[(A >> 8) & 0xff] << 8 | S[A & 0xff]; } /* (a0,a1,a2,a3) => (a1,a2,a3,a0) */ static uint32_t rot_word(uint32_t A) { return ROL32(A, 8); } #ifdef CRYPTO_INFO static void print_rk(const AES_KEY *aes_key) { size_t i; for (i = 0; i <= aes_key->rounds; i++) { printf("%08x ", aes_key->rk[4 * i]); printf("%08x ", aes_key->rk[4 * i + 1]); printf("%08x ", aes_key->rk[4 * i + 2]); printf("%08x\n", aes_key->rk[4 * i + 3]); } printf("\n"); } #endif int aes_set_encrypt_key(AES_KEY *aes_key, const uint8_t *key, size_t keylen) { /* Nk: num user key words * AES-128 Nk = 4 W[44] * AES-192 Nk = 6 W[52] * AES-256 Nk = 8 W[60] */ uint32_t *W = (uint32_t *)aes_key->rk; size_t Nk = keylen/sizeof(uint32_t); size_t i; switch (keylen) { case AES128_KEY_SIZE: aes_key->rounds = 10; break; case AES192_KEY_SIZE: aes_key->rounds = 12; break; case AES256_KEY_SIZE: aes_key->rounds = 14; break; default: return 0; } for (i = 0; i < Nk; i++) { W[i] = GETU32(key + sizeof(uint32_t) * i); } for (; i < 4 * (aes_key->rounds + 1); i++) { uint32_t T = W[i - 1]; if (i % Nk == 0) { T = rot_word(T); T = sub_word(T); T ^= ((uint32_t)Rcon[i/Nk] << 24); } else if (Nk == 8 && i % 8 == 4) { T = sub_word(T); } W[i] = W[i - Nk] ^ T; } #ifdef CRYPTO_INFO print_rk(aes_key); #endif return 1; } int aes_set_decrypt_key(AES_KEY *aes_key, const uint8_t *key, size_t keylen) { int ret = 0; AES_KEY enc_key; size_t i; if (!aes_set_encrypt_key(&enc_key, key, keylen)) { goto end; } for (i = 0; i <= enc_key.rounds; i++) { aes_key->rk[4*i ] = enc_key.rk[4*(enc_key.rounds - i)]; aes_key->rk[4*i + 1] = enc_key.rk[4*(enc_key.rounds - i) + 1]; aes_key->rk[4*i + 2] = enc_key.rk[4*(enc_key.rounds - i) + 2]; aes_key->rk[4*i + 3] = enc_key.rk[4*(enc_key.rounds - i) + 3]; } aes_key->rounds = enc_key.rounds; ret = 1; #ifdef CRYPTO_INFO print_rk(aes_key); #endif end: memset(&enc_key, 0, sizeof(AES_KEY)); return ret; } /* * |S00 S01 S02 S03| | | * |S10 S11 S12 S13| xor |W0 W1 W2 W3| * |S20 S21 S22 S23| | | * |S30 S31 S32 S33| | | */ static void add_round_key(uint8_t state[4][4], const uint32_t *W) { int i; for (i = 0; i < 4; i++) { state[0][i] ^= (W[i] >> 24) & 0xff; state[1][i] ^= (W[i] >> 16) & 0xff; state[2][i] ^= (W[i] >> 8) & 0xff; state[3][i] ^= (W[i] ) & 0xff; } } static void sub_bytes(uint8_t state[4][4]) { int i, j; for (i = 0; i < 4; i++) { for (j = 0; j < 4; j++) { state[i][j] = S[state[i][j]]; } } } static void inv_sub_bytes(uint8_t state[4][4]) { int i, j; for (i = 0; i < 4; i++) { for (j = 0; j < 4; j++) { state[i][j] = S_inv[state[i][j]]; } } } /* * |S00 S01 S02 S03| <<<0 |S00 S01 S02 S03| * |S10 S11 S12 S13| <<<1 => |S11 S12 S13 S10| * |S20 S21 S22 S23| <<<2 |S22 S23 S20 S21| * |S30 S31 S32 S33| <<<3 |S33 S30 S31 S32| */ static void shift_rows(uint8_t state[4][4]) { uint8_t tmp; tmp = state[1][0]; state[1][0] = state[1][1]; state[1][1] = state[1][2]; state[1][2] = state[1][3]; state[1][3] = tmp; tmp = state[2][0]; state[2][0] = state[2][2]; state[2][2] = tmp; tmp = state[2][1]; state[2][1] = state[2][3]; state[2][3] = tmp; tmp = state[3][3]; state[3][3] = state[3][2]; state[3][2] = state[3][1]; state[3][1] = state[3][0]; state[3][0] = tmp; } /* * |S00 S01 S02 S03| >>>0 |S00 S01 S02 S03| * |S10 S11 S12 S13| >>>1 => |S13 S10 S11 S12| * |S20 S21 S22 S23| >>>2 |S22 S23 S20 S21| * |S30 S31 S32 S33| >>>3 |S31 S32 S33 S30| */ static void inv_shift_rows(uint8_t state[4][4]) { uint8_t tmp; tmp = state[1][3]; state[1][3] = state[1][2]; state[1][2] = state[1][1]; state[1][1] = state[1][0]; state[1][0] = tmp; tmp = state[2][0]; state[2][0] = state[2][2]; state[2][2] = tmp; tmp = state[2][1]; state[2][1] = state[2][3]; state[2][3] = tmp; tmp = state[3][0]; state[3][0] = state[3][1]; state[3][1] = state[3][2]; state[3][2] = state[3][3]; state[3][3] = tmp; } /* * GF(2^8) defSed by f(x) = x^8 + x^4 + x^3 + x + 1 * x^8 == x^4 + x^3 + x + 1 = 0001,1011 = 0x1b * if A[7] == 0 then 2 * A = (A << 1) * else 2 * A = (A << 1) xor A */ #define x1(a) (a) static uint8_t x2(uint8_t a) { return (a >> 7) ? ((a << 1) ^ 0x1b) : (a << 1); } static uint8_t x3(uint8_t a) { return x2(a) ^ x1(a); } static uint8_t x9(uint8_t a) { return x2(x2(x2(a))) ^ x1(a); } /* 0x0b = 11 = 8 + 2 + 1 */ static uint8_t xb(uint8_t a) { return x2(x2(x2(a))) ^ x2(a) ^ x1(a); } /* 0x0d = 13 = 8 + 4 + 1 */ static uint8_t xd(uint8_t a) { return x2(x2(x2(a))) ^ x2(x2(a)) ^ x1(a); } /* 0x0e = 14 = 8 + 4 + 2 */ static uint8_t xe(uint8_t a) { return x2(x2(x2(a))) ^ x2(x2(a)) ^ x2(a); } /* * |2 3 1 1| |S00 S01 S02 S03| * |1 2 3 1| |S10 S11 S12 S13| * |1 1 2 3|*|S20 S21 S22 S23| * |3 1 1 2| |S30 S31 S32 S33| */ static void mix_columns(uint8_t S[4][4]) { uint8_t tmp0, tmp1, tmp2, tmp3; int i; /* i-th column */ for (i = 0; i < 4; i++) { tmp0 = x2(S[0][i]) ^ x3(S[1][i]) ^ x1(S[2][i]) ^ x1(S[3][i]); tmp1 = x1(S[0][i]) ^ x2(S[1][i]) ^ x3(S[2][i]) ^ x1(S[3][i]); tmp2 = x1(S[0][i]) ^ x1(S[1][i]) ^ x2(S[2][i]) ^ x3(S[3][i]); tmp3 = x3(S[0][i]) ^ x1(S[1][i]) ^ x1(S[2][i]) ^ x2(S[3][i]); S[0][i] = tmp0; S[1][i] = tmp1; S[2][i] = tmp2; S[3][i] = tmp3; } } /* * |0E 0B 0D 09| |02 03 01 01| |1 0 0 0| * |09 0E 0B 0D|*|01 02 03 01| = |0 1 0 0| * |0D 09 0E 0B| |01 01 02 03| |0 0 1 0| * |0B 0D 09 0E| |03 01 01 02| |0 0 0 1| * */ static void inv_mix_columns(uint8_t S[4][4]) { uint8_t tmp0, tmp1, tmp2, tmp3; int i; /* i-th column */ for (i = 0; i < 4; i++) { tmp0 = xe(S[0][i]) ^ xb(S[1][i]) ^ xd(S[2][i]) ^ x9(S[3][i]); tmp1 = x9(S[0][i]) ^ xe(S[1][i]) ^ xb(S[2][i]) ^ xd(S[3][i]); tmp2 = xd(S[0][i]) ^ x9(S[1][i]) ^ xe(S[2][i]) ^ xb(S[3][i]); tmp3 = xb(S[0][i]) ^ xd(S[1][i]) ^ x9(S[2][i]) ^ xe(S[3][i]); S[0][i] = tmp0; S[1][i] = tmp1; S[2][i] = tmp2; S[3][i] = tmp3; } } #ifdef CRYPTO_INFO static void print_state(const uint8_t S[4][4]) { int i; for (i = 0; i < 4; i++) { printf("%02x %02x %02x %02x\n", S[i][0], S[i][1], S[i][2], S[i][3]); } printf("\n"); } #endif void aes_encrypt(const AES_KEY *key, const uint8_t in[16], uint8_t out[16]) { uint8_t state[4][4]; size_t i; /* fill state columns */ for (i = 0; i < 4; i++) { state[0][i] = *in++; state[1][i] = *in++; state[2][i] = *in++; state[3][i] = *in++; } /* Sitial add round key */ add_round_key(state, key->rk); /* first n-1 rounds */ for (i = 1; i < key->rounds; i++) { sub_bytes(state); shift_rows(state); mix_columns(state); add_round_key(state, key->rk + 4*i); } /* last round withtmp mix columns */ sub_bytes(state); shift_rows(state); add_round_key(state, key->rk + 4*i); /* tmpput state columns */ for (i = 0; i < 4; i++) { *out++ = state[0][i]; *out++ = state[1][i]; *out++ = state[2][i]; *out++ = state[3][i]; } memset(state, 0, sizeof(state)); } void aes_decrypt(const AES_KEY *aes_key, const uint8_t in[16], uint8_t out[16]) { uint8_t state[4][4]; size_t i; /* fill state columns */ for (i = 0; i < 4; i++) { state[0][i] = *in++; state[1][i] = *in++; state[2][i] = *in++; state[3][i] = *in++; } /* Sitial add round key */ add_round_key(state, aes_key->rk); /* first n-1 rounds */ for (i = 1; i < aes_key->rounds; i++) { inv_shift_rows(state); inv_sub_bytes(state); add_round_key(state, aes_key->rk + 4*i); inv_mix_columns(state); } /* last round withtmp mix columns */ inv_shift_rows(state); inv_sub_bytes(state); add_round_key(state, aes_key->rk + 4*i); /* tmpput state columns */ for (i = 0; i < 4; i++) { *out++ = state[0][i]; *out++ = state[1][i]; *out++ = state[2][i]; *out++ = state[3][i]; } memset(state, 0, sizeof(state)); }