/* md5.c - MD5 Message-Digest Algorithm
* Copyright (C) 1995,1996,1998,1999,2001,2002,
* 2003 Free Software Foundation, Inc.
*
* This file is part of Libgcrypt.
*
* Libgcrypt is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Libgcrypt is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see .
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* According to the definition of MD5 in RFC 1321 from April 1992.
* NOTE: This is *not* the same file as the one from glibc.
* Written by Ulrich Drepper , 1995.
* heavily modified for GnuPG by Werner Koch
further de-libgcrypted to make it a bit more standalone.
*/
/* Test values:
* "" D4 1D 8C D9 8F 00 B2 04 E9 80 09 98 EC F8 42 7E
* "a" 0C C1 75 B9 C0 F1 B6 A8 31 C3 99 E2 69 77 26 61
* "abc 90 01 50 98 3C D2 4F B0 D6 96 3F 7D 28 E1 7F 72
* "message digest" F9 6B 69 7D 7C B7 93 8D 52 5A 2F 31 AA F1 61 D0
*/
#include "quakedef.h"
typedef struct {
unsigned char buf[64];
qint32_t count; //count in the buffer
quint64_t totalbytes;
quint32_t A,B,C,D; /* chaining variables */
} MD5_CONTEXT;
static void
md5_init( void *context)
{
MD5_CONTEXT *ctx = context;
ctx->A = 0x67452301;
ctx->B = 0xefcdab89;
ctx->C = 0x98badcfe;
ctx->D = 0x10325476;
ctx->totalbytes = 0;
ctx->count = 0;
}
/* These are the four functions used in the four steps of the MD5 algorithm
and defined in the RFC 1321. The first function is a little bit optimized
(as found in Colin Plumbs public domain implementation). */
/* #define FF(b, c, d) ((b & c) | (~b & d)) */
#define FF(b, c, d) (d ^ (b & (c ^ d)))
#define FG(b, c, d) FF (d, b, c)
#define FH(b, c, d) (b ^ c ^ d)
#define FI(b, c, d) (c ^ (b | ~d))
#define buf_put_le32(b,d) ((b)[0]=(d)&0xff, (b)[1]=((d)>>8)&0xff, (b)[2]=((d)>>16)&0xff, (b)[3]=((d)>>24)&0xff)
#define buf_get_le32(b) ((b)[0]|((b)[1]<<8)|((b)[2]<<16)|((b)[3]<<24))
#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
/****************
* transform 64 bytes
*/
static void
md5_transform_blk ( void *c, const unsigned char *data )
{
MD5_CONTEXT *ctx = c;
quint32_t correct_words[16];
register quint32_t A = ctx->A;
register quint32_t B = ctx->B;
register quint32_t C = ctx->C;
register quint32_t D = ctx->D;
quint32_t *cwp = correct_words;
int i;
for ( i = 0; i < 16; i++ )
correct_words[i] = buf_get_le32(data + i * 4);
#define OP(a, b, c, d, s, T) \
do \
{ \
a += FF (b, c, d) + (*cwp++) + T; \
a = rol(a, s); \
a += b; \
} while (0)
/* Before we start, one word about the strange constants.
They are defined in RFC 1321 as
T[i] = (int) (4294967296.0 * fabs (sin (i))), i=1..64
*/
/* Round 1. */
OP (A, B, C, D, 7, 0xd76aa478);
OP (D, A, B, C, 12, 0xe8c7b756);
OP (C, D, A, B, 17, 0x242070db);
OP (B, C, D, A, 22, 0xc1bdceee);
OP (A, B, C, D, 7, 0xf57c0faf);
OP (D, A, B, C, 12, 0x4787c62a);
OP (C, D, A, B, 17, 0xa8304613);
OP (B, C, D, A, 22, 0xfd469501);
OP (A, B, C, D, 7, 0x698098d8);
OP (D, A, B, C, 12, 0x8b44f7af);
OP (C, D, A, B, 17, 0xffff5bb1);
OP (B, C, D, A, 22, 0x895cd7be);
OP (A, B, C, D, 7, 0x6b901122);
OP (D, A, B, C, 12, 0xfd987193);
OP (C, D, A, B, 17, 0xa679438e);
OP (B, C, D, A, 22, 0x49b40821);
#undef OP
#define OP(f, a, b, c, d, k, s, T) \
do \
{ \
a += f (b, c, d) + correct_words[k] + T; \
a = rol(a, s); \
a += b; \
} while (0)
/* Round 2. */
OP (FG, A, B, C, D, 1, 5, 0xf61e2562);
OP (FG, D, A, B, C, 6, 9, 0xc040b340);
OP (FG, C, D, A, B, 11, 14, 0x265e5a51);
OP (FG, B, C, D, A, 0, 20, 0xe9b6c7aa);
OP (FG, A, B, C, D, 5, 5, 0xd62f105d);
OP (FG, D, A, B, C, 10, 9, 0x02441453);
OP (FG, C, D, A, B, 15, 14, 0xd8a1e681);
OP (FG, B, C, D, A, 4, 20, 0xe7d3fbc8);
OP (FG, A, B, C, D, 9, 5, 0x21e1cde6);
OP (FG, D, A, B, C, 14, 9, 0xc33707d6);
OP (FG, C, D, A, B, 3, 14, 0xf4d50d87);
OP (FG, B, C, D, A, 8, 20, 0x455a14ed);
OP (FG, A, B, C, D, 13, 5, 0xa9e3e905);
OP (FG, D, A, B, C, 2, 9, 0xfcefa3f8);
OP (FG, C, D, A, B, 7, 14, 0x676f02d9);
OP (FG, B, C, D, A, 12, 20, 0x8d2a4c8a);
/* Round 3. */
OP (FH, A, B, C, D, 5, 4, 0xfffa3942);
OP (FH, D, A, B, C, 8, 11, 0x8771f681);
OP (FH, C, D, A, B, 11, 16, 0x6d9d6122);
OP (FH, B, C, D, A, 14, 23, 0xfde5380c);
OP (FH, A, B, C, D, 1, 4, 0xa4beea44);
OP (FH, D, A, B, C, 4, 11, 0x4bdecfa9);
OP (FH, C, D, A, B, 7, 16, 0xf6bb4b60);
OP (FH, B, C, D, A, 10, 23, 0xbebfbc70);
OP (FH, A, B, C, D, 13, 4, 0x289b7ec6);
OP (FH, D, A, B, C, 0, 11, 0xeaa127fa);
OP (FH, C, D, A, B, 3, 16, 0xd4ef3085);
OP (FH, B, C, D, A, 6, 23, 0x04881d05);
OP (FH, A, B, C, D, 9, 4, 0xd9d4d039);
OP (FH, D, A, B, C, 12, 11, 0xe6db99e5);
OP (FH, C, D, A, B, 15, 16, 0x1fa27cf8);
OP (FH, B, C, D, A, 2, 23, 0xc4ac5665);
/* Round 4. */
OP (FI, A, B, C, D, 0, 6, 0xf4292244);
OP (FI, D, A, B, C, 7, 10, 0x432aff97);
OP (FI, C, D, A, B, 14, 15, 0xab9423a7);
OP (FI, B, C, D, A, 5, 21, 0xfc93a039);
OP (FI, A, B, C, D, 12, 6, 0x655b59c3);
OP (FI, D, A, B, C, 3, 10, 0x8f0ccc92);
OP (FI, C, D, A, B, 10, 15, 0xffeff47d);
OP (FI, B, C, D, A, 1, 21, 0x85845dd1);
OP (FI, A, B, C, D, 8, 6, 0x6fa87e4f);
OP (FI, D, A, B, C, 15, 10, 0xfe2ce6e0);
OP (FI, C, D, A, B, 6, 15, 0xa3014314);
OP (FI, B, C, D, A, 13, 21, 0x4e0811a1);
OP (FI, A, B, C, D, 4, 6, 0xf7537e82);
OP (FI, D, A, B, C, 11, 10, 0xbd3af235);
OP (FI, C, D, A, B, 2, 15, 0x2ad7d2bb);
OP (FI, B, C, D, A, 9, 21, 0xeb86d391);
/* Put checksum in context given as argument. */
ctx->A += A;
ctx->B += B;
ctx->C += C;
ctx->D += D;
}
static void md5_update(void *ctx, const void *in, size_t sz)
{
MD5_CONTEXT *hd = ctx;
hd->totalbytes += sz; //need this for later.
if (hd->count)
{ //pack any extra data into our temp buffer, if we've already got data there.
size_t pre = sizeof(hd->buf) - hd->count;
if (pre > sz)
pre = sz;
memcpy(hd->buf + hd->count, in, sz);
sz -= pre;
in = (const qbyte*)in + pre;
}
if (hd->count == sizeof(hd->buf))
{ //if we filled it then process it.
md5_transform_blk(ctx, hd->buf);
hd->count = 0;
}
while (sz >= sizeof(hd->buf))
{ //and process the bulk of it.
md5_transform_blk(ctx, in);
sz -= sizeof(hd->buf);
in = (const qbyte*)in + sizeof(hd->buf);
}
//save off any extra data.
memcpy(hd->buf, in, sz);
hd->count = sz;
}
/* The routine final terminates the message-digest computation and
* ends with the desired message digest in mdContext->digest[0...15].
* The handle is prepared for a new MD5 cycle.
* Returns 16 bytes representing the digest.
*/
static void
md5_final(qbyte *digest, void *context)
{
MD5_CONTEXT *hd = context;
qbyte *p;
quint64_t origbigcount = hd->totalbytes<<3;
hd->buf[hd->count++] = 0x80; //pad the data with a 1 (md5_update keeps at least one byte of the buffer free).
if (hd->count > 56)
{ //not enough space to fix the total count. fill with 0s.
if (hd->count < sizeof(hd->buf))
hd->buf[hd->count++] = 0; //pad any remaining
md5_transform_blk(context, hd->buf);
hd->count = 0;
}
while(hd->count < 56) //we need to fill the entire thing, pretty much
hd->buf[hd->count++] = 0; //pad any remaining
buf_put_le32(hd->buf + 56, (origbigcount));
buf_put_le32(hd->buf + 60, (origbigcount>>32));
md5_transform_blk(context, hd->buf);
p = digest;
#define X(a) do { buf_put_le32(p, hd->a); p += 4; } while(0)
X(A);
X(B);
X(C);
X(D);
#undef X
memset(hd->buf, 0, sizeof(hd->buf));
hd->count = 0;
}
hashfunc_t hash_md5 =
{
16,
sizeof(MD5_CONTEXT),
md5_init,
md5_update,
md5_final,
};
/*
__attribute__((constructor)) void md5_unit_test(void)
{
qbyte digest[16];
CalcHash(&hash_md5, digest, sizeof(digest), "", 0);
if (memcmp(digest, "\xD4\x1D\x8C\xD9\x8F\x00\xB2\x04" "\xE9\x80\x09\x98\xEC\xF8\x42\x7E", 16))
printf("fail\n");
CalcHash(&hash_md5, digest, sizeof(digest), "a", 1);
if (memcmp(digest, "\x0C\xC1\x75\xB9\xC0\xF1\xB6\xA8" "\x31\xC3\x99\xE2\x69\x77\x26\x61", 16))
printf("fail\n");
CalcHash(&hash_md5, digest, sizeof(digest), "abc", 3);
if (memcmp(digest, "\x90\x01\x50\x98\x3C\xD2\x4F\xB0" "\xD6\x96\x3F\x7D\x28\xE1\x7F\x72", 16))
printf("fail\n");
CalcHash(&hash_md5, digest, sizeof(digest), "message digest", 14);
if (memcmp(digest, "\xF9\x6B\x69\x7D\x7C\xB7\x93\x8D" "\x52\x5A\x2F\x31\xAA\xF1\x61\xD0", 16))
printf("fail\n");
}*/