143 lines
4.6 KiB
C
143 lines
4.6 KiB
C
/*
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* Copyright (c) 2003, 2007-14 Matteo Frigo
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* Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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/*
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independent implementation of Ron Rivest's MD5 message-digest
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algorithm, based on rfc 1321.
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Optimized for small code size, not speed. Works as long as
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sizeof(md5uint) >= 4.
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*/
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#include "kernel/ifftw.h"
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/* sintab[i] = 4294967296.0 * abs(sin((double)(i + 1))) */
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static const md5uint sintab[64] = {
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0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
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0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
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0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
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0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
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0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
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0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
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0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
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0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
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0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
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0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
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0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05,
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0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
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0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
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0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
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0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
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0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
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};
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/* see rfc 1321 section 3.4 */
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static const struct roundtab {
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char k;
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char s;
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} roundtab[64] = {
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{ 0, 7}, { 1, 12}, { 2, 17}, { 3, 22},
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{ 4, 7}, { 5, 12}, { 6, 17}, { 7, 22},
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{ 8, 7}, { 9, 12}, { 10, 17}, { 11, 22},
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{ 12, 7}, { 13, 12}, { 14, 17}, { 15, 22},
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{ 1, 5}, { 6, 9}, { 11, 14}, { 0, 20},
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{ 5, 5}, { 10, 9}, { 15, 14}, { 4, 20},
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{ 9, 5}, { 14, 9}, { 3, 14}, { 8, 20},
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{ 13, 5}, { 2, 9}, { 7, 14}, { 12, 20},
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{ 5, 4}, { 8, 11}, { 11, 16}, { 14, 23},
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{ 1, 4}, { 4, 11}, { 7, 16}, { 10, 23},
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{ 13, 4}, { 0, 11}, { 3, 16}, { 6, 23},
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{ 9, 4}, { 12, 11}, { 15, 16}, { 2, 23},
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{ 0, 6}, { 7, 10}, { 14, 15}, { 5, 21},
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{ 12, 6}, { 3, 10}, { 10, 15}, { 1, 21},
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{ 8, 6}, { 15, 10}, { 6, 15}, { 13, 21},
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{ 4, 6}, { 11, 10}, { 2, 15}, { 9, 21}
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};
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#define rol(a, s) ((a << (int)(s)) | (a >> (32 - (int)(s))))
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static void doblock(md5sig state, const unsigned char *data)
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{
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md5uint a, b, c, d, t, x[16];
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const md5uint msk = (md5uint)0xffffffffUL;
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int i;
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/* encode input bytes into md5uint */
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for (i = 0; i < 16; ++i) {
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const unsigned char *p = data + 4 * i;
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x[i] = (unsigned)p[0] | ((unsigned)p[1] << 8) | ((unsigned)p[2] << 16) | ((unsigned)p[3] << 24);
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}
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a = state[0]; b = state[1]; c = state[2]; d = state[3];
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for (i = 0; i < 64; ++i) {
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const struct roundtab *p = roundtab + i;
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switch (i >> 4) {
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case 0: a += (b & c) | (~b & d); break;
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case 1: a += (b & d) | (c & ~d); break;
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case 2: a += b ^ c ^ d; break;
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case 3: a += c ^ (b | ~d); break;
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}
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a += sintab[i];
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a += x[(int)(p->k)];
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a &= msk;
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t = b + rol(a, p->s);
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a = d; d = c; c = b; b = t;
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}
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state[0] = (state[0] + a) & msk;
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state[1] = (state[1] + b) & msk;
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state[2] = (state[2] + c) & msk;
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state[3] = (state[3] + d) & msk;
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}
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void X(md5begin)(md5 *p)
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{
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p->s[0] = 0x67452301;
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p->s[1] = 0xefcdab89;
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p->s[2] = 0x98badcfe;
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p->s[3] = 0x10325476;
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p->l = 0;
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}
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void X(md5putc)(md5 *p, unsigned char c)
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{
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p->c[p->l % 64] = c;
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if (((++p->l) % 64) == 0) doblock(p->s, p->c);
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}
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void X(md5end)(md5 *p)
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{
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unsigned l, i;
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l = 8 * p->l; /* length before padding, in bits */
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/* rfc 1321 section 3.1: padding */
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X(md5putc)(p, 0x80);
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while ((p->l % 64) != 56) X(md5putc)(p, 0x00);
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/* rfc 1321 section 3.2: length (little endian) */
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for (i = 0; i < 8; ++i) {
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X(md5putc)(p, (unsigned char)(l & 0xFF));
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l = l >> 8;
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}
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/* Now p->l % 64 == 0 and signature is in p->s */
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}
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