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/*
* Copyright (c) 2003 Matteo Frigo
* Copyright (c) 2003 Massachusetts Institute of Technology
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/*
independent implementation of Ron Rivest's MD5 message-digest
algorithm, based on rfc 1321.
Optimized for small code size, not speed. Works as long as
sizeof(md5uint) >= 4.
*/
#include "ifftw.h"
/* sintab[i] = 4294967296.0 * abs(sin((double)(i + 1))) */
static const md5uint sintab[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
};
/* see rfc 1321 section 3.4 */
static const struct roundtab {
char k;
char s;
} roundtab[64] = {
{ 0, 7}, { 1, 12}, { 2, 17}, { 3, 22},
{ 4, 7}, { 5, 12}, { 6, 17}, { 7, 22},
{ 8, 7}, { 9, 12}, { 10, 17}, { 11, 22},
{ 12, 7}, { 13, 12}, { 14, 17}, { 15, 22},
{ 1, 5}, { 6, 9}, { 11, 14}, { 0, 20},
{ 5, 5}, { 10, 9}, { 15, 14}, { 4, 20},
{ 9, 5}, { 14, 9}, { 3, 14}, { 8, 20},
{ 13, 5}, { 2, 9}, { 7, 14}, { 12, 20},
{ 5, 4}, { 8, 11}, { 11, 16}, { 14, 23},
{ 1, 4}, { 4, 11}, { 7, 16}, { 10, 23},
{ 13, 4}, { 0, 11}, { 3, 16}, { 6, 23},
{ 9, 4}, { 12, 11}, { 15, 16}, { 2, 23},
{ 0, 6}, { 7, 10}, { 14, 15}, { 5, 21},
{ 12, 6}, { 3, 10}, { 10, 15}, { 1, 21},
{ 8, 6}, { 15, 10}, { 6, 15}, { 13, 21},
{ 4, 6}, { 11, 10}, { 2, 15}, { 9, 21}
};
#define rol(a, s) ((a << (int)(s)) | (a >> (32 - (int)(s))))
static void doblock(md5sig state, const unsigned char *data)
{
md5uint a, b, c, d, t, x[16];
const md5uint msk = 0xffffffffUL;
int i;
/* encode input bytes into md5uint */
for (i = 0; i < 16; ++i) {
const unsigned char *p = data + 4 * i;
x[i] = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
}
a = state[0]; b = state[1]; c = state[2]; d = state[3];
for (i = 0; i < 64; ++i) {
const struct roundtab *p = roundtab + i;
int round = i / 16;
switch (round) {
case 0: a += (b & c) | (~b & d); break;
case 1: a += (b & d) | (c & ~d); break;
case 2: a += b ^ c ^ d; break;
case 3: a += c ^ (b | ~d); break;
}
a += sintab[i];
a += x[(int)(p->k)];
a &= msk;
t = b + rol(a, p->s);
a = d; d = c; c = b; b = t;
}
state[0] = (state[0] + a) & msk;
state[1] = (state[1] + b) & msk;
state[2] = (state[2] + c) & msk;
state[3] = (state[3] + d) & msk;
}
void X(md5begin)(md5 *p)
{
p->s[0] = 0x67452301;
p->s[1] = 0xefcdab89;
p->s[2] = 0x98badcfe;
p->s[3] = 0x10325476;
p->l = 0;
}
void X(md5putc)(md5 *p, unsigned char c)
{
p->c[p->l % 64] = c;
if (((++p->l) % 64) == 0) doblock(p->s, p->c);
}
void X(md5end)(md5 *p)
{
unsigned l, i;
l = 8 * p->l; /* length before padding, in bits */
/* rfc 1321 section 3.1: padding */
X(md5putc)(p, 0x80);
while ((p->l % 64) != 56) X(md5putc)(p, 0x00);
/* rfc 1321 section 3.2: length (little endian) */
for (i = 0; i < 8; ++i) {
X(md5putc)(p, l & 0xFF);
l = l >> 8;
}
/* Now p->l % 64 == 0 and signature is in p->s */
}
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