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Diffstat (limited to 'src/fftw3/kernel/md5.c')
| -rw-r--r-- | src/fftw3/kernel/md5.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/src/fftw3/kernel/md5.c b/src/fftw3/kernel/md5.c new file mode 100644 index 0000000..edbd811 --- /dev/null +++ b/src/fftw3/kernel/md5.c @@ -0,0 +1,143 @@ +/* + * 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 */ +} |