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單文件AES加解密算法

#pragma once #include //for int8_t #include //for memcmp #include //for intrinsics for AES-NI //compile using gcc and following arguments: -g;-O0;-Wall;-msse2;-msse;-march=native;-maes //internal stuff //macros #define DO_ENC_BLOCK(m,k) \ do{\ m = _mm_xor_si128 (m, k[ 0]); \ m = _mm_aesenc_si128 (m, k[ 1]); \ m = _mm_aesenc_si128 (m, k[ 2]); \ m = _mm_aesenc_si128 (m, k[ 3]); \ m = _mm_aesenc_si128 (m, k[ 4]); \ m = _mm_aesenc_si128 (m, k[ 5]); \ m = _mm_aesenc_si128 (m, k[ 6]); \ m = _mm_aesenc_si128 (m, k[ 7]); \ m = _mm_aesenc_si128 (m, k[ 8]); \ m = _mm_aesenc_si128 (m, k[ 9]); \ m = _mm_aesenclast_si128(m, k[10]);\ }while(0) #define DO_DEC_BLOCK(m,k) \ do{\ m = _mm_xor_si128 (m, k[10+0]); \ m = _mm_aesdec_si128 (m, k[10+1]); \ m = _mm_aesdec_si128 (m, k[10+2]); \ m = _mm_aesdec_si128 (m, k[10+3]); \ m = _mm_aesdec_si128 (m, k[10+4]); \ m = _mm_aesdec_si128 (m, k[10+5]); \ m = _mm_aesdec_si128 (m, k[10+6]); \ m = _mm_aesdec_si128 (m, k[10+7]); \ m = _mm_aesdec_si128 (m, k[10+8]); \ m = _mm_aesdec_si128 (m, k[10+9]); \ m = _mm_aesdeclast_si128(m, k[0]);\ }while(0) #define AES_128_key_exp(k, rcon) aes_128_key_expansion(k, _mm_aeskeygenassist_si128(k, rcon)) static __m128i aes_128_key_expansion(__m128i key, __m128i keygened) { keygened = _mm_shuffle_epi32(keygened, _MM_SHUFFLE(3,3,3,3)); key = _mm_xor_si128(key, _mm_slli_si128(key, 4)); key = _mm_xor_si128(key, _mm_slli_si128(key, 4)); key = _mm_xor_si128(key, _mm_slli_si128(key, 4)); return _mm_xor_si128(key, keygened); } //public API static void aes128_load_key_enc_only(uint8_t *enc_key, __m128i *key_schedule) { key_schedule[0] = _mm_loadu_si128((const __m128i*) enc_key); key_schedule[1] = AES_128_key_exp(key_schedule[0], 0x01); key_schedule[2] = AES_128_key_exp(key_schedule[1], 0x02); key_schedule[3] = AES_128_key_exp(key_schedule[2], 0x04); key_schedule[4] = AES_128_key_exp(key_schedule[3], 0x08); key_schedule[5] = AES_128_key_exp(key_schedule[4], 0x10); key_schedule[6] = AES_128_key_exp(key_schedule[5], 0x20); key_schedule[7] = AES_128_key_exp(key_schedule[6], 0x40); key_schedule[8] = AES_128_key_exp(key_schedule[7], 0x80); key_schedule[9] = AES_128_key_exp(key_schedule[8], 0x1B); key_schedule[10] = AES_128_key_exp(key_schedule[9], 0x36); } static void aes128_load_key(uint8_t *enc_key, __m128i *key_schedule) { aes128_load_key_enc_only(enc_key, key_schedule); // generate decryption keys in reverse order. // k[10] is shared by last encryption and first decryption rounds // k[0] is shared by first encryption round and last decryption round (and is the original user key) // For some implementation reasons, decryption key schedule is NOT the encryption key schedule in reverse order key_schedule[11] = _mm_aesimc_si128(key_schedule[9]); key_schedule[12] = _mm_aesimc_si128(key_schedule[8]); key_schedule[13] = _mm_aesimc_si128(key_schedule[7]); key_schedule[14] = _mm_aesimc_si128(key_schedule[6]); key_schedule[15] = _mm_aesimc_si128(key_schedule[5]); key_schedule[16] = _mm_aesimc_si128(key_schedule[4]); key_schedule[17] = _mm_aesimc_si128(key_schedule[3]); key_schedule[18] = _mm_aesimc_si128(key_schedule[2]); key_schedule[19] = _mm_aesimc_si128(key_schedule[1]); } static void aes128_enc(__m128i *key_schedule, uint8_t *plainText,uint8_t *cipherText) { __m128i m = _mm_loadu_si128((__m128i *) plainText); DO_ENC_BLOCK(m,key_schedule); _mm_storeu_si128((__m128i *) cipherText, m); } static void aes128_dec(__m128i *key_schedule, uint8_t *cipherText,uint8_t *plainText) { __m128i m = _mm_loadu_si128((__m128i *) cipherText); DO_DEC_BLOCK(m,key_schedule); _mm_storeu_si128((__m128i *) plainText, m); } //return 0 if no error //1 if encryption failed //2 if decryption failed //3 if both failed static int aes128_self_test(void) { uint8_t plain[] = {0x32, 0x43, 0xf6, 0xa8, 0x88, 0x5a, 0x30, 0x8d, 0x31, 0x31, 0x98, 0xa2, 0xe0, 0x37, 0x07, 0x34}; uint8_t enc_key[] = {0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c}; uint8_t cipher[] = {0x39, 0x25, 0x84, 0x1d, 0x02, 0xdc, 0x09, 0xfb, 0xdc, 0x11, 0x85, 0x97, 0x19, 0x6a, 0x0b, 0x32}; uint8_t computed_cipher[16]; uint8_t computed_plain[16]; int out=0; __m128i key_schedule[20]; aes128_load_key(enc_key,key_schedule); aes128_enc(key_schedule,plain,computed_cipher); aes128_dec(key_schedule,cipher,computed_plain); if(memcmp(cipher,computed_cipher,sizeof(cipher))) out=1; if(memcmp(plain,computed_plain,sizeof(plain))) out|=2; return out; }

posted on 2021-08-30 21:39 天下閱讀(388) 評論(0) 編輯收藏引用所屬分類: 加密解密

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