| // Copyright 2016 Google Inc. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| #include "cryptoc/md5.h" |
| |
| #include <string.h> |
| #include <stdint.h> |
| |
| #define rol(bits, value) (((value) << (bits)) | ((value) >> (32 - (bits)))) |
| |
| static const char Kr[64] = |
| { |
| 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, |
| 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, |
| 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, |
| 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21 |
| }; |
| |
| static const uint32_t KK[64] = |
| { |
| 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, |
| 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501, |
| 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, |
| 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, |
| 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, |
| 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8, |
| 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, |
| 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a, |
| 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, |
| 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, |
| 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05, |
| 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, |
| 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, |
| 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1, |
| 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, |
| 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391 |
| }; |
| |
| static void MD5_Transform(LITE_MD5_CTX* ctx) { |
| uint32_t W[64]; |
| uint32_t A, B, C, D; |
| uint8_t* p = ctx->buf; |
| int t; |
| |
| for(t = 0; t < 16; ++t) { |
| uint32_t tmp = *p++; |
| tmp |= (uint32_t)*p++ << 8u; |
| tmp |= (uint32_t)*p++ << 16u; |
| tmp |= (uint32_t)*p++ << 24u; |
| W[t] = tmp; |
| } |
| |
| A = ctx->state[0]; |
| B = ctx->state[1]; |
| C = ctx->state[2]; |
| D = ctx->state[3]; |
| |
| for(t = 0; t < 64; t++) { |
| uint32_t f, tmp; |
| int g; |
| |
| if (t < 16) { |
| f = (D^(B&(C^D))); |
| g = t; |
| } else if ( t < 32) { |
| f = (C^(D&(B^C))); |
| g = (5*t + 1) & 15; |
| } else if ( t < 48) { |
| f = (B^C^D); |
| g = (3*t + 5) & 15; |
| } else { |
| f = (C^(B|(~D))); |
| g = (7*t) & 15; |
| } |
| |
| tmp = D; |
| D = C; |
| C = B; |
| B = B + rol(Kr[t], (A+f+KK[t]+W[g])); |
| A = tmp; |
| } |
| |
| ctx->state[0] += A; |
| ctx->state[1] += B; |
| ctx->state[2] += C; |
| ctx->state[3] += D; |
| } |
| |
| static const HASH_VTAB MD5_VTAB = { |
| MD5_init, |
| MD5_update, |
| MD5_final, |
| MD5_hash, |
| MD5_DIGEST_SIZE, |
| #ifdef SHA512_SUPPORT |
| MD5_BLOCK_SIZE, |
| #endif |
| }; |
| |
| void MD5_init(LITE_MD5_CTX* ctx) { |
| ctx->f = &MD5_VTAB; |
| ctx->state[0] = 0x67452301; |
| ctx->state[1] = 0xEFCDAB89; |
| ctx->state[2] = 0x98BADCFE; |
| ctx->state[3] = 0x10325476; |
| ctx->count = 0; |
| } |
| |
| |
| void MD5_update(LITE_MD5_CTX* ctx, const void* data, size_t len) { |
| unsigned int i = (unsigned int)(ctx->count & 63); |
| const uint8_t* p = (const uint8_t*)data; |
| |
| ctx->count += len; |
| |
| while (len--) { |
| ctx->buf[i++] = *p++; |
| if (i == 64) { |
| MD5_Transform(ctx); |
| i = 0; |
| } |
| } |
| } |
| |
| |
| const uint8_t* MD5_final(LITE_MD5_CTX* ctx) { |
| uint8_t* p = ctx->buf; |
| uint64_t cnt = ctx->count * 8; |
| int i; |
| |
| MD5_update(ctx, (uint8_t*)"\x80", 1); |
| while ((ctx->count & 63) != 56) { |
| MD5_update(ctx, (uint8_t*)"\0", 1); |
| } |
| for (i = 0; i < 4; ++i) { |
| uint8_t tmp = (uint8_t)(((uint32_t)cnt) >> (i * 8)); |
| MD5_update(ctx, &tmp, 1); |
| } |
| cnt >>= 32; |
| for (i = 0; i < 4; ++i) { |
| uint8_t tmp = (uint8_t)(((uint32_t)cnt) >> (i * 8)); |
| MD5_update(ctx, &tmp, 1); |
| } |
| |
| for (i = 0; i < 4; i++) { |
| uint32_t tmp = ctx->state[i]; |
| *p++ = tmp; |
| *p++ = tmp >> 8; |
| *p++ = tmp >> 16; |
| *p++ = tmp >> 24; |
| } |
| |
| return ctx->buf; |
| } |
| |
| |
| /* Convenience function */ |
| const uint8_t* MD5_hash(const void* data, size_t len, uint8_t* digest) { |
| LITE_MD5_CTX ctx; |
| MD5_init(&ctx); |
| MD5_update(&ctx, data, len); |
| memcpy(digest, MD5_final(&ctx), MD5_DIGEST_SIZE); |
| return digest; |
| } |