/* * Full unroll implementation of aes-128 * * Author: LuoPeng (luopengxq@gmail.com) * Time: 2017.08.02 */ #include #include #include "aes.h" /* * round constants */ static uint8_t RC[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36}; /* * Sbox */ static uint8_t SBOX[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}; /* * Inverse Sboxs */ static uint8_t INV_SBOX[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}; /** * https://en.wikipedia.org/wiki/Finite_field_arithmetic * Multiply two numbers in the GF(2^8) finite field defined * by the polynomial x^8 + x^4 + x^3 + x + 1 = 0 * We do use mul2(int8_t a) but not mul(uint8_t a, uint8_t b) * just in order to get a higher speed. */ static inline uint8_t mul2(uint8_t a) { return (a&0x80) ? ((a<<1)^0x1b) : (a<<1); } void aes_key_schedule_128(const uint8_t *key, uint8_t *roundkeys) { uint8_t temp[4]; uint8_t *last4bytes; // point to the last 4 bytes of one round uint8_t *lastround; uint8_t i; for (i = 0; i < 16; ++i) { *roundkeys++ = *key++; } last4bytes = roundkeys-4; for (i = 0; i < AES_ROUNDS; ++i) { // k0-k3 for next round temp[3] = SBOX[*last4bytes++]; temp[0] = SBOX[*last4bytes++]; temp[1] = SBOX[*last4bytes++]; temp[2] = SBOX[*last4bytes++]; temp[0] ^= RC[i]; lastround = roundkeys-16; *roundkeys++ = temp[0] ^ *lastround++; *roundkeys++ = temp[1] ^ *lastround++; *roundkeys++ = temp[2] ^ *lastround++; *roundkeys++ = temp[3] ^ *lastround++; // k4-k7 for next round *roundkeys++ = *last4bytes++ ^ *lastround++; *roundkeys++ = *last4bytes++ ^ *lastround++; *roundkeys++ = *last4bytes++ ^ *lastround++; *roundkeys++ = *last4bytes++ ^ *lastround++; // k8-k11 for next round *roundkeys++ = *last4bytes++ ^ *lastround++; *roundkeys++ = *last4bytes++ ^ *lastround++; *roundkeys++ = *last4bytes++ ^ *lastround++; *roundkeys++ = *last4bytes++ ^ *lastround++; // k12-k15 for next round *roundkeys++ = *last4bytes++ ^ *lastround++; *roundkeys++ = *last4bytes++ ^ *lastround++; *roundkeys++ = *last4bytes++ ^ *lastround++; *roundkeys++ = *last4bytes++ ^ *lastround++; } } // encryption #define sub_bytes(ct, tmp) \ *tmp = SBOX[*ct], *(tmp+1) = SBOX[*(ct+1)], *(tmp+2) = SBOX[*(ct+2)], *(tmp+3) = SBOX[*(ct+3)]; \ *(tmp+4) = SBOX[*(ct+4)], *(tmp+5) = SBOX[*(ct+5)], *(tmp+6) = SBOX[*(ct+6)], *(tmp+7) = SBOX[*(ct+7)]; \ *(tmp+8) = SBOX[*(ct+8)], *(tmp+9) = SBOX[*(ct+9)], *(tmp+10) = SBOX[*(ct+10)], *(tmp+11) = SBOX[*(ct+11)]; \ *(tmp+12) = SBOX[*(ct+12)], *(tmp+13) = SBOX[*(ct+13)], *(tmp+14) = SBOX[*(ct+14)], *(tmp+15) = SBOX[*(ct+15)]; #define shift_rows(tmp, t) \ t = *(tmp+1), *(tmp+1) = *(tmp+5), *(tmp+5) = *(tmp+9), *(tmp+9) = *(tmp+13), *(tmp+13) = t; \ t = *(tmp+2), *(tmp+2) = *(tmp+10), *(tmp+10) = t; \ t = *(tmp+6), *(tmp+6) = *(tmp+14), *(tmp+14) = t; \ t = *(tmp+15), *(tmp+15) = *(tmp+11), *(tmp+11) = *(tmp+7), *(tmp+7) = *(tmp+3), *(tmp+3) = t; #define mix_columns(ct, tmp, t) \ t = tmp[0] ^ tmp[1] ^ tmp[2] ^ tmp[3]; \ ct[0] = mul2(tmp[0] ^ tmp[1]) ^ tmp[0] ^ t; \ ct[1] = mul2(tmp[1] ^ tmp[2]) ^ tmp[1] ^ t; \ ct[2] = mul2(tmp[2] ^ tmp[3]) ^ tmp[2] ^ t; \ ct[3] = mul2(tmp[3] ^ tmp[0]) ^ tmp[3] ^ t; \ t = tmp[4] ^ tmp[5] ^ tmp[6] ^ tmp[7]; \ ct[4] = mul2(tmp[4] ^ tmp[5]) ^ tmp[4] ^ t; \ ct[5] = mul2(tmp[5] ^ tmp[6]) ^ tmp[5] ^ t; \ ct[6] = mul2(tmp[6] ^ tmp[7]) ^ tmp[6] ^ t; \ ct[7] = mul2(tmp[7] ^ tmp[4]) ^ tmp[7] ^ t; \ t = tmp[8] ^ tmp[9] ^ tmp[10] ^ tmp[11]; \ ct[8] = mul2(tmp[8] ^ tmp[9]) ^ tmp[8] ^ t; \ ct[9] = mul2(tmp[9] ^ tmp[10]) ^ tmp[9] ^ t; \ ct[10] = mul2(tmp[10] ^ tmp[11]) ^ tmp[10] ^ t; \ ct[11] = mul2(tmp[11] ^ tmp[8]) ^ tmp[11] ^ t; \ t = tmp[12] ^ tmp[13] ^ tmp[14] ^ tmp[15]; \ ct[12] = mul2(tmp[12] ^ tmp[13]) ^ tmp[12] ^ t; \ ct[13] = mul2(tmp[13] ^ tmp[14]) ^ tmp[13] ^ t; \ ct[14] = mul2(tmp[14] ^ tmp[15]) ^ tmp[14] ^ t; \ ct[15] = mul2(tmp[15] ^ tmp[12]) ^ tmp[15] ^ t; #define add_round_key(in, out, rks) \ *out = *in ^ *rks++, *(out+1) = *(in+1) ^ *rks++, *(out+2) = *(in+2) ^ *rks++, *(out+3) = *(in+3) ^ *rks++; \ *(out+4) = *(in+4) ^ *rks++, *(out+5) = *(in+5) ^ *rks++, *(out+6) = *(in+6) ^ *rks++, *(out+7) = *(in+7) ^ *rks++; \ *(out+8) = *(in+8) ^ *rks++, *(out+9) = *(in+9) ^ *rks++, *(out+10) = *(in+10) ^ *rks++, *(out+11) = *(in+11) ^ *rks++; \ *(out+12) = *(in+12) ^ *rks++, *(out+13) = *(in+13) ^ *rks++, *(out+14) = *(in+14) ^ *rks++, *(out+15) = *(in+15) ^ *rks++; #define enc_one_round(ct, rks, tmp, t) \ sub_bytes(ct, tmp); \ shift_rows(tmp, t); \ mix_columns(ct, tmp, t); \ add_round_key(ct, ct, rks); #define enc_last_round(ct, rks, t) \ sub_bytes(ct, ct); \ shift_rows(ct, t); \ add_round_key(ct, ct, rks); void aes_encrypt_128(const uint8_t *roundkeys, const uint8_t *plaintext, uint8_t *ciphertext) { uint8_t tmp[16], t; add_round_key(plaintext, ciphertext, roundkeys); enc_one_round(ciphertext, roundkeys, tmp, t); enc_one_round(ciphertext, roundkeys, tmp, t); enc_one_round(ciphertext, roundkeys, tmp, t); enc_one_round(ciphertext, roundkeys, tmp, t); enc_one_round(ciphertext, roundkeys, tmp, t); enc_one_round(ciphertext, roundkeys, tmp, t); enc_one_round(ciphertext, roundkeys, tmp, t); enc_one_round(ciphertext, roundkeys, tmp, t); enc_one_round(ciphertext, roundkeys, tmp, t); enc_last_round(ciphertext, roundkeys, t); } // decryption #define inv_add_round_key(in, out, rks) \ *out = *in ^ *rks, *(out+1) = *(in+1) ^ *(rks+1), *(out+2) = *(in+2) ^ *(rks+2), *(out+3) = *(in+3) ^ *(rks+3); \ *(out+4) = *(in+4) ^ *(rks+4), *(out+5) = *(in+5) ^ *(rks+5), *(out+6) = *(in+6) ^ *(rks+6), *(out+7) = *(in+7) ^ *(rks+7); \ *(out+8) = *(in+8) ^ *(rks+8), *(out+9) = *(in+9) ^ *(rks+9), *(out+10) = *(in+10) ^ *(rks+10), *(out+11) = *(in+11) ^ *(rks+11); \ *(out+12) = *(in+12) ^ *(rks+12), *(out+13) = *(in+13) ^ *(rks+13), *(out+14) = *(in+14) ^ *(rks+14), *(out+15) = *(in+15) ^ *(rks+15); #define inv_shift_rows(pt, t) \ t = *(pt+13); *(pt+13) = *(pt+9); *(pt+9) = *(pt+5); *(pt+5) = *(pt+1); *(pt+1) = t; \ t = *(pt+14); *(pt+14) = *(pt+6); *(pt+6) = t; \ t = *(pt+10); *(pt+10) = *(pt+2); *(pt+2) = t; \ t = *(pt+3); *(pt+3) = *(pt+7); *(pt+7) = *(pt+11); *(pt+11) = *(pt+15); *(pt+15) = t; #define inv_sub_bytes(pt) \ *pt = INV_SBOX[*pt], *(pt+1) = INV_SBOX[*(pt+1)], *(pt+2) = INV_SBOX[*(pt+2)], *(pt+3) = INV_SBOX[*(pt+3)]; \ *(pt+4) = INV_SBOX[*(pt+4)], *(pt+5) = INV_SBOX[*(pt+5)], *(pt+6) = INV_SBOX[*(pt+6)], *(pt+7) = INV_SBOX[*(pt+7)]; \ *(pt+8) = INV_SBOX[*(pt+8)], *(pt+9) = INV_SBOX[*(pt+9)], *(pt+10) = INV_SBOX[*(pt+10)], *(pt+11) = INV_SBOX[*(pt+11)]; \ *(pt+12) = INV_SBOX[*(pt+12)], *(pt+13) = INV_SBOX[*(pt+13)], *(pt+14) = INV_SBOX[*(pt+14)], *(pt+15) = INV_SBOX[*(pt+15)]; #define inv_mix_columns(pt, tmp, t, u, v) \ t = tmp[0] ^ tmp[1] ^ tmp[2] ^ tmp[3]; \ pt[0] = t ^ tmp[0] ^ mul2(tmp[0] ^ tmp[1]), pt[1] = t ^ tmp[1] ^ mul2(tmp[1] ^ tmp[2]); \ pt[2] = t ^ tmp[2] ^ mul2(tmp[2] ^ tmp[3]), pt[3] = t ^ tmp[3] ^ mul2(tmp[3] ^ tmp[0]); \ u = mul2(mul2(tmp[0] ^ tmp[2])), v = mul2(mul2(tmp[1] ^ tmp[3])), t = mul2(u ^ v); \ pt[0] ^= t ^ u, pt[1] ^= t ^ v, pt[2] ^= t ^ u, pt[3] ^= t ^ v; \ t = tmp[4] ^ tmp[5] ^ tmp[6] ^ tmp[7]; \ pt[4] = t ^ tmp[4] ^ mul2(tmp[4] ^ tmp[5]), pt[5] = t ^ tmp[5] ^ mul2(tmp[5] ^ tmp[6]); \ pt[6] = t ^ tmp[6] ^ mul2(tmp[6] ^ tmp[7]), pt[7] = t ^ tmp[7] ^ mul2(tmp[7] ^ tmp[4]); \ u = mul2(mul2(tmp[4] ^ tmp[6])), v = mul2(mul2(tmp[5] ^ tmp[7])), t = mul2(u ^ v); \ pt[4] ^= t ^ u, pt[5] ^= t ^ v, pt[6] ^= t ^ u, pt[7] ^= t ^ v; \ t = tmp[8] ^ tmp[9] ^ tmp[10] ^ tmp[11]; \ pt[8] = t ^ tmp[8] ^ mul2(tmp[8] ^ tmp[9]), pt[9] = t ^ tmp[9] ^ mul2(tmp[9] ^ tmp[10]); \ pt[10] = t ^ tmp[10] ^ mul2(tmp[10] ^ tmp[11]), pt[11] = t ^ tmp[11] ^ mul2(tmp[11] ^ tmp[8]); \ u = mul2(mul2(tmp[8] ^ tmp[10])), v = mul2(mul2(tmp[9] ^ tmp[11])), t = mul2(u ^ v); \ pt[8] ^= t ^ u, pt[9] ^= t ^ v, pt[10] ^= t ^ u, pt[11] ^= t ^ v; \ t = tmp[12] ^ tmp[13] ^ tmp[14] ^ tmp[15]; \ pt[12] = t ^ tmp[12] ^ mul2(tmp[12] ^ tmp[13]), pt[13] = t ^ tmp[13] ^ mul2(tmp[13] ^ tmp[14]); \ pt[14] = t ^ tmp[14] ^ mul2(tmp[14] ^ tmp[15]), pt[15] = t ^ tmp[15] ^ mul2(tmp[15] ^ tmp[12]); \ u = mul2(mul2(tmp[12] ^ tmp[14])), v = mul2(mul2(tmp[13] ^ tmp[15])), t = mul2(u ^ v); \ pt[12] ^= t ^ u, pt[13] ^= t ^ v, pt[14] ^= t ^ u, pt[15] ^= t ^ v; #define dec_first_round(ct, pt, rks, t) \ inv_add_round_key(ct, pt, rks); \ rks -= 16; \ inv_shift_rows(pt, t); \ inv_sub_bytes(pt); #define dec_one_round(pt, rks, tmp, t, u, v) \ inv_add_round_key(pt, tmp, rks); \ roundkeys -= 16; \ inv_mix_columns(pt, tmp, t, u, v); \ inv_shift_rows(pt, t); \ inv_sub_bytes(pt); void aes_decrypt_128(const uint8_t *roundkeys, const uint8_t *ciphertext, uint8_t *plaintext) { uint8_t tmp[16]; uint8_t t, u, v; roundkeys += 160; dec_first_round(ciphertext, plaintext, roundkeys, t); dec_one_round(plaintext, roundkeys, tmp, t, u, v); dec_one_round(plaintext, roundkeys, tmp, t, u, v); dec_one_round(plaintext, roundkeys, tmp, t, u, v); dec_one_round(plaintext, roundkeys, tmp, t, u, v); dec_one_round(plaintext, roundkeys, tmp, t, u, v); dec_one_round(plaintext, roundkeys, tmp, t, u, v); dec_one_round(plaintext, roundkeys, tmp, t, u, v); dec_one_round(plaintext, roundkeys, tmp, t, u, v); dec_one_round(plaintext, roundkeys, tmp, t, u, v); inv_add_round_key(plaintext, plaintext, roundkeys); }