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md5.cpp
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/*
* MD5 hash in C
*
* Copyright (c) 2017 Project Nayuki. (MIT License)
* https://www.nayuki.io/page/fast-md5-hash-implementation-in-x86-assembly
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
* - The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* - The Software is provided "as is", without warranty of any kind, express or
* implied, including but not limited to the warranties of merchantability,
* fitness for a particular purpose and noninfringement. In no event shall the
* authors or copyright holders be liable for any claim, damages or other
* liability, whether in an action of contract, tort or otherwise, arising from,
* out of or in connection with the Software or the use or other dealings in the
* Software.
*/
#include <cstdint>
#include <cstring>
#include "md5.h"
void md5_hash(const uint8_t message[], size_t len, uint32_t hash[STATE_LEN]) {
hash[0] = UINT32_C(0x67452301);
hash[1] = UINT32_C(0xEFCDAB89);
hash[2] = UINT32_C(0x98BADCFE);
hash[3] = UINT32_C(0x10325476);
#define LENGTH_SIZE 8 // In bytes
size_t off;
for (off = 0; len - off >= BLOCK_LEN; off += BLOCK_LEN)
md5_compress(hash, &message[off]);
uint8_t block[BLOCK_LEN] = {0};
size_t rem = len - off;
memcpy(block, &message[off], rem);
block[rem] = 0x80;
rem++;
if (BLOCK_LEN - rem < LENGTH_SIZE) {
md5_compress(hash, block);
memset(block, 0, sizeof(block));
}
block[BLOCK_LEN - LENGTH_SIZE] = (uint8_t)((len & 0x1FU) << 3);
len >>= 5;
for (int i = 1; i < LENGTH_SIZE; i++, len >>= 8)
block[BLOCK_LEN - LENGTH_SIZE + i] = (uint8_t)(len & 0xFFU);
md5_compress(hash, block);
}
void md5_compress(uint32_t state[4], const uint8_t block[64]) {
#define LOADSCHEDULE(i) \
schedule[i] = (uint32_t)block[i * 4 + 0] << 0 \
| (uint32_t)block[i * 4 + 1] << 8 \
| (uint32_t)block[i * 4 + 2] << 16 \
| (uint32_t)block[i * 4 + 3] << 24;
uint32_t schedule[16];
LOADSCHEDULE( 0)
LOADSCHEDULE( 1)
LOADSCHEDULE( 2)
LOADSCHEDULE( 3)
LOADSCHEDULE( 4)
LOADSCHEDULE( 5)
LOADSCHEDULE( 6)
LOADSCHEDULE( 7)
LOADSCHEDULE( 8)
LOADSCHEDULE( 9)
LOADSCHEDULE(10)
LOADSCHEDULE(11)
LOADSCHEDULE(12)
LOADSCHEDULE(13)
LOADSCHEDULE(14)
LOADSCHEDULE(15)
#define ROTL32(x, n) (((0U + (x)) << (n)) | ((x) >> (32 - (n)))) // Assumes that x is uint32_t and 0 < n < 32
#define ROUND0(a, b, c, d, k, s, t) ROUND_TAIL(a, b, d ^ (b & (c ^ d)), k, s, t)
#define ROUND1(a, b, c, d, k, s, t) ROUND_TAIL(a, b, c ^ (d & (b ^ c)), k, s, t)
#define ROUND2(a, b, c, d, k, s, t) ROUND_TAIL(a, b, b ^ c ^ d , k, s, t)
#define ROUND3(a, b, c, d, k, s, t) ROUND_TAIL(a, b, c ^ (b | ~d) , k, s, t)
#define ROUND_TAIL(a, b, expr, k, s, t) \
a = 0U + a + (expr) + UINT32_C(t) + schedule[k]; \
a = 0U + b + ROTL32(a, s);
uint32_t a = state[0];
uint32_t b = state[1];
uint32_t c = state[2];
uint32_t d = state[3];
ROUND0(a, b, c, d, 0, 7, 0xD76AA478)
ROUND0(d, a, b, c, 1, 12, 0xE8C7B756)
ROUND0(c, d, a, b, 2, 17, 0x242070DB)
ROUND0(b, c, d, a, 3, 22, 0xC1BDCEEE)
ROUND0(a, b, c, d, 4, 7, 0xF57C0FAF)
ROUND0(d, a, b, c, 5, 12, 0x4787C62A)
ROUND0(c, d, a, b, 6, 17, 0xA8304613)
ROUND0(b, c, d, a, 7, 22, 0xFD469501)
ROUND0(a, b, c, d, 8, 7, 0x698098D8)
ROUND0(d, a, b, c, 9, 12, 0x8B44F7AF)
ROUND0(c, d, a, b, 10, 17, 0xFFFF5BB1)
ROUND0(b, c, d, a, 11, 22, 0x895CD7BE)
ROUND0(a, b, c, d, 12, 7, 0x6B901122)
ROUND0(d, a, b, c, 13, 12, 0xFD987193)
ROUND0(c, d, a, b, 14, 17, 0xA679438E)
ROUND0(b, c, d, a, 15, 22, 0x49B40821)
ROUND1(a, b, c, d, 1, 5, 0xF61E2562)
ROUND1(d, a, b, c, 6, 9, 0xC040B340)
ROUND1(c, d, a, b, 11, 14, 0x265E5A51)
ROUND1(b, c, d, a, 0, 20, 0xE9B6C7AA)
ROUND1(a, b, c, d, 5, 5, 0xD62F105D)
ROUND1(d, a, b, c, 10, 9, 0x02441453)
ROUND1(c, d, a, b, 15, 14, 0xD8A1E681)
ROUND1(b, c, d, a, 4, 20, 0xE7D3FBC8)
ROUND1(a, b, c, d, 9, 5, 0x21E1CDE6)
ROUND1(d, a, b, c, 14, 9, 0xC33707D6)
ROUND1(c, d, a, b, 3, 14, 0xF4D50D87)
ROUND1(b, c, d, a, 8, 20, 0x455A14ED)
ROUND1(a, b, c, d, 13, 5, 0xA9E3E905)
ROUND1(d, a, b, c, 2, 9, 0xFCEFA3F8)
ROUND1(c, d, a, b, 7, 14, 0x676F02D9)
ROUND1(b, c, d, a, 12, 20, 0x8D2A4C8A)
ROUND2(a, b, c, d, 5, 4, 0xFFFA3942)
ROUND2(d, a, b, c, 8, 11, 0x8771F681)
ROUND2(c, d, a, b, 11, 16, 0x6D9D6122)
ROUND2(b, c, d, a, 14, 23, 0xFDE5380C)
ROUND2(a, b, c, d, 1, 4, 0xA4BEEA44)
ROUND2(d, a, b, c, 4, 11, 0x4BDECFA9)
ROUND2(c, d, a, b, 7, 16, 0xF6BB4B60)
ROUND2(b, c, d, a, 10, 23, 0xBEBFBC70)
ROUND2(a, b, c, d, 13, 4, 0x289B7EC6)
ROUND2(d, a, b, c, 0, 11, 0xEAA127FA)
ROUND2(c, d, a, b, 3, 16, 0xD4EF3085)
ROUND2(b, c, d, a, 6, 23, 0x04881D05)
ROUND2(a, b, c, d, 9, 4, 0xD9D4D039)
ROUND2(d, a, b, c, 12, 11, 0xE6DB99E5)
ROUND2(c, d, a, b, 15, 16, 0x1FA27CF8)
ROUND2(b, c, d, a, 2, 23, 0xC4AC5665)
ROUND3(a, b, c, d, 0, 6, 0xF4292244)
ROUND3(d, a, b, c, 7, 10, 0x432AFF97)
ROUND3(c, d, a, b, 14, 15, 0xAB9423A7)
ROUND3(b, c, d, a, 5, 21, 0xFC93A039)
ROUND3(a, b, c, d, 12, 6, 0x655B59C3)
ROUND3(d, a, b, c, 3, 10, 0x8F0CCC92)
ROUND3(c, d, a, b, 10, 15, 0xFFEFF47D)
ROUND3(b, c, d, a, 1, 21, 0x85845DD1)
ROUND3(a, b, c, d, 8, 6, 0x6FA87E4F)
ROUND3(d, a, b, c, 15, 10, 0xFE2CE6E0)
ROUND3(c, d, a, b, 6, 15, 0xA3014314)
ROUND3(b, c, d, a, 13, 21, 0x4E0811A1)
ROUND3(a, b, c, d, 4, 6, 0xF7537E82)
ROUND3(d, a, b, c, 11, 10, 0xBD3AF235)
ROUND3(c, d, a, b, 2, 15, 0x2AD7D2BB)
ROUND3(b, c, d, a, 9, 21, 0xEB86D391)
state[0] = 0U + state[0] + a;
state[1] = 0U + state[1] + b;
state[2] = 0U + state[2] + c;
state[3] = 0U + state[3] + d;
}