md5.c

00001 /* md5.c
00002  *
00003  * Copyright (C) 2006-2009 Sawtooth Consulting Ltd.
00004  *
00005  * This file is part of CyaSSL.
00006  *
00007  * CyaSSL is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 2 of the License, or
00010  * (at your option) any later version.
00011  *
00012  * CyaSSL is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
00020  */
00021 
00022 
00023 #include "ctc_md5.h"
00024 #ifdef NO_INLINE
00025     #include "misc.h"
00026 #else
00027     #include "misc.c"
00028 #endif
00029 
00030 
00031 
00032 #ifndef min
00033 
00034     static INLINE word32 min(word32 a, word32 b)
00035     {
00036         return a > b ? b : a;
00037     }
00038 
00039 #endif /* min */
00040 
00041 
00042 void InitMd5(Md5* md5)
00043 {
00044     md5->digest[0] = 0x67452301L;
00045     md5->digest[1] = 0xefcdab89L;
00046     md5->digest[2] = 0x98badcfeL;
00047     md5->digest[3] = 0x10325476L;
00048 
00049     md5->buffLen = 0;
00050     md5->loLen   = 0;
00051     md5->hiLen   = 0;
00052 }
00053 
00054 
00055 static void Transform(Md5* md5)
00056 {
00057 #define F1(x, y, z) (z ^ (x & (y ^ z)))
00058 #define F2(x, y, z) F1(z, x, y)
00059 #define F3(x, y, z) (x ^ y ^ z)
00060 #define F4(x, y, z) (y ^ (x | ~z))
00061 
00062 #define MD5STEP(f, w, x, y, z, data, s) \
00063     w = rotlFixed(w + f(x, y, z) + data, s) + x
00064 
00065     /* Copy context->state[] to working vars  */
00066     word32 a = md5->digest[0];
00067     word32 b = md5->digest[1];
00068     word32 c = md5->digest[2];
00069     word32 d = md5->digest[3];
00070 
00071     MD5STEP(F1, a, b, c, d, md5->buffer[0]  + 0xd76aa478,  7);
00072     MD5STEP(F1, d, a, b, c, md5->buffer[1]  + 0xe8c7b756, 12);
00073     MD5STEP(F1, c, d, a, b, md5->buffer[2]  + 0x242070db, 17);
00074     MD5STEP(F1, b, c, d, a, md5->buffer[3]  + 0xc1bdceee, 22);
00075     MD5STEP(F1, a, b, c, d, md5->buffer[4]  + 0xf57c0faf,  7);
00076     MD5STEP(F1, d, a, b, c, md5->buffer[5]  + 0x4787c62a, 12);
00077     MD5STEP(F1, c, d, a, b, md5->buffer[6]  + 0xa8304613, 17);
00078     MD5STEP(F1, b, c, d, a, md5->buffer[7]  + 0xfd469501, 22);
00079     MD5STEP(F1, a, b, c, d, md5->buffer[8]  + 0x698098d8,  7);
00080     MD5STEP(F1, d, a, b, c, md5->buffer[9]  + 0x8b44f7af, 12);
00081     MD5STEP(F1, c, d, a, b, md5->buffer[10] + 0xffff5bb1, 17);
00082     MD5STEP(F1, b, c, d, a, md5->buffer[11] + 0x895cd7be, 22);
00083     MD5STEP(F1, a, b, c, d, md5->buffer[12] + 0x6b901122,  7);
00084     MD5STEP(F1, d, a, b, c, md5->buffer[13] + 0xfd987193, 12);
00085     MD5STEP(F1, c, d, a, b, md5->buffer[14] + 0xa679438e, 17);
00086     MD5STEP(F1, b, c, d, a, md5->buffer[15] + 0x49b40821, 22);
00087 
00088     MD5STEP(F2, a, b, c, d, md5->buffer[1]  + 0xf61e2562,  5);
00089     MD5STEP(F2, d, a, b, c, md5->buffer[6]  + 0xc040b340,  9);
00090     MD5STEP(F2, c, d, a, b, md5->buffer[11] + 0x265e5a51, 14);
00091     MD5STEP(F2, b, c, d, a, md5->buffer[0]  + 0xe9b6c7aa, 20);
00092     MD5STEP(F2, a, b, c, d, md5->buffer[5]  + 0xd62f105d,  5);
00093     MD5STEP(F2, d, a, b, c, md5->buffer[10] + 0x02441453,  9);
00094     MD5STEP(F2, c, d, a, b, md5->buffer[15] + 0xd8a1e681, 14);
00095     MD5STEP(F2, b, c, d, a, md5->buffer[4]  + 0xe7d3fbc8, 20);
00096     MD5STEP(F2, a, b, c, d, md5->buffer[9]  + 0x21e1cde6,  5);
00097     MD5STEP(F2, d, a, b, c, md5->buffer[14] + 0xc33707d6,  9);
00098     MD5STEP(F2, c, d, a, b, md5->buffer[3]  + 0xf4d50d87, 14);
00099     MD5STEP(F2, b, c, d, a, md5->buffer[8]  + 0x455a14ed, 20);
00100     MD5STEP(F2, a, b, c, d, md5->buffer[13] + 0xa9e3e905,  5);
00101     MD5STEP(F2, d, a, b, c, md5->buffer[2]  + 0xfcefa3f8,  9);
00102     MD5STEP(F2, c, d, a, b, md5->buffer[7]  + 0x676f02d9, 14);
00103     MD5STEP(F2, b, c, d, a, md5->buffer[12] + 0x8d2a4c8a, 20);
00104 
00105     MD5STEP(F3, a, b, c, d, md5->buffer[5]  + 0xfffa3942,  4);
00106     MD5STEP(F3, d, a, b, c, md5->buffer[8]  + 0x8771f681, 11);
00107     MD5STEP(F3, c, d, a, b, md5->buffer[11] + 0x6d9d6122, 16);
00108     MD5STEP(F3, b, c, d, a, md5->buffer[14] + 0xfde5380c, 23);
00109     MD5STEP(F3, a, b, c, d, md5->buffer[1]  + 0xa4beea44,  4);
00110     MD5STEP(F3, d, a, b, c, md5->buffer[4]  + 0x4bdecfa9, 11);
00111     MD5STEP(F3, c, d, a, b, md5->buffer[7]  + 0xf6bb4b60, 16);
00112     MD5STEP(F3, b, c, d, a, md5->buffer[10] + 0xbebfbc70, 23);
00113     MD5STEP(F3, a, b, c, d, md5->buffer[13] + 0x289b7ec6,  4);
00114     MD5STEP(F3, d, a, b, c, md5->buffer[0]  + 0xeaa127fa, 11);
00115     MD5STEP(F3, c, d, a, b, md5->buffer[3]  + 0xd4ef3085, 16);
00116     MD5STEP(F3, b, c, d, a, md5->buffer[6]  + 0x04881d05, 23);
00117     MD5STEP(F3, a, b, c, d, md5->buffer[9]  + 0xd9d4d039,  4);
00118     MD5STEP(F3, d, a, b, c, md5->buffer[12] + 0xe6db99e5, 11);
00119     MD5STEP(F3, c, d, a, b, md5->buffer[15] + 0x1fa27cf8, 16);
00120     MD5STEP(F3, b, c, d, a, md5->buffer[2]  + 0xc4ac5665, 23);
00121 
00122     MD5STEP(F4, a, b, c, d, md5->buffer[0]  + 0xf4292244,  6);
00123     MD5STEP(F4, d, a, b, c, md5->buffer[7]  + 0x432aff97, 10);
00124     MD5STEP(F4, c, d, a, b, md5->buffer[14] + 0xab9423a7, 15);
00125     MD5STEP(F4, b, c, d, a, md5->buffer[5]  + 0xfc93a039, 21);
00126     MD5STEP(F4, a, b, c, d, md5->buffer[12] + 0x655b59c3,  6);
00127     MD5STEP(F4, d, a, b, c, md5->buffer[3]  + 0x8f0ccc92, 10);
00128     MD5STEP(F4, c, d, a, b, md5->buffer[10] + 0xffeff47d, 15);
00129     MD5STEP(F4, b, c, d, a, md5->buffer[1]  + 0x85845dd1, 21);
00130     MD5STEP(F4, a, b, c, d, md5->buffer[8]  + 0x6fa87e4f,  6);
00131     MD5STEP(F4, d, a, b, c, md5->buffer[15] + 0xfe2ce6e0, 10);
00132     MD5STEP(F4, c, d, a, b, md5->buffer[6]  + 0xa3014314, 15);
00133     MD5STEP(F4, b, c, d, a, md5->buffer[13] + 0x4e0811a1, 21);
00134     MD5STEP(F4, a, b, c, d, md5->buffer[4]  + 0xf7537e82,  6);
00135     MD5STEP(F4, d, a, b, c, md5->buffer[11] + 0xbd3af235, 10);
00136     MD5STEP(F4, c, d, a, b, md5->buffer[2]  + 0x2ad7d2bb, 15);
00137     MD5STEP(F4, b, c, d, a, md5->buffer[9]  + 0xeb86d391, 21);
00138     
00139     /* Add the working vars back into digest state[]  */
00140     md5->digest[0] += a;
00141     md5->digest[1] += b;
00142     md5->digest[2] += c;
00143     md5->digest[3] += d;
00144 }
00145 
00146 
00147 static INLINE void AddLength(Md5* md5, word32 len)
00148 {
00149     word32 tmp = md5->loLen;
00150     if ( (md5->loLen += len) < tmp)
00151         md5->hiLen++;                       /* carry low to high */
00152 }
00153 
00154 
00155 void Md5Update(Md5* md5, const byte* data, word32 len)
00156 {
00157     /* do block size increments */
00158     byte* local = (byte*)md5->buffer;
00159 
00160     while (len) {
00161         word32 add = min(len, MD5_BLOCK_SIZE - md5->buffLen);
00162         XMEMCPY(&local[md5->buffLen], data, add);
00163 
00164         md5->buffLen += add;
00165         data         += add;
00166         len          -= add;
00167 
00168         if (md5->buffLen == MD5_BLOCK_SIZE) {
00169             #ifdef BIG_ENDIAN_ORDER
00170                 ByteReverseBytes(local, local, MD5_BLOCK_SIZE);
00171             #endif
00172             Transform(md5);
00173             AddLength(md5, MD5_BLOCK_SIZE);
00174             md5->buffLen = 0;
00175         }
00176     }
00177 }
00178 
00179 
00180 void Md5Final(Md5* md5, byte* hash)
00181 {
00182     byte* local = (byte*)md5->buffer;
00183 
00184     AddLength(md5, md5->buffLen);               /* before adding pads */
00185 
00186     local[md5->buffLen++] = 0x80;  /* add 1 */
00187 
00188     /* pad with zeros */
00189     if (md5->buffLen > MD5_PAD_SIZE) {
00190         XMEMSET(&local[md5->buffLen], 0, MD5_BLOCK_SIZE - md5->buffLen);
00191         md5->buffLen += MD5_BLOCK_SIZE - md5->buffLen;
00192 
00193         #ifdef BIG_ENDIAN_ORDER
00194             ByteReverseBytes(local, local, MD5_BLOCK_SIZE);
00195         #endif
00196         Transform(md5);
00197         md5->buffLen = 0;
00198     }
00199     XMEMSET(&local[md5->buffLen], 0, MD5_PAD_SIZE - md5->buffLen);
00200    
00201     /* put lengths in bits */
00202     md5->loLen = md5->loLen << 3;
00203     md5->hiLen = (md5->loLen >> (8*sizeof(md5->loLen) - 3)) + 
00204                  (md5->hiLen << 3);
00205 
00206     /* store lengths */
00207     #ifdef BIG_ENDIAN_ORDER
00208         ByteReverseBytes(local, local, MD5_BLOCK_SIZE);
00209     #endif
00210     /* ! length ordering dependent on digest endian type ! */
00211     XMEMCPY(&local[MD5_PAD_SIZE], &md5->loLen, sizeof(word32));
00212     XMEMCPY(&local[MD5_PAD_SIZE + sizeof(word32)], &md5->hiLen, sizeof(word32));
00213 
00214     Transform(md5);
00215     #ifdef BIG_ENDIAN_ORDER
00216         ByteReverseWords(md5->digest, md5->digest, MD5_DIGEST_SIZE);
00217     #endif
00218     XMEMCPY(hash, md5->digest, MD5_DIGEST_SIZE);
00219 
00220     InitMd5(md5);  /* reset state */
00221 }
00222