md5.c

00001 /* md5.c
00002  *
00003  * Copyright (C) 2006-2013 wolfSSL Inc.
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 #ifdef HAVE_CONFIG_H
00024     #include <config.h>
00025 #endif
00026 
00027 #include <cyassl/ctaocrypt/settings.h>
00028 
00029 #ifndef NO_MD5
00030 
00031 #include <cyassl/ctaocrypt/md5.h>
00032 
00033 #ifdef NO_INLINE
00034     #include <cyassl/ctaocrypt/misc.h>
00035 #else
00036     #include <ctaocrypt/src/misc.c>
00037 #endif
00038 
00039 
00040 #ifdef STM32F2_HASH
00041     /*
00042      * STM32F2 hardware MD5 support through the STM32F2 standard peripheral
00043      * library. Documentation located in STM32F2xx Standard Peripheral Library
00044      * document (See note in README).
00045      */
00046     #include "stm32f2xx.h"
00047 
00048     void InitMd5(Md5* md5)
00049     {
00050         /* STM32F2 struct notes:
00051          * md5->buffer  = first 4 bytes used to hold partial block if needed 
00052          * md5->buffLen = num bytes currently stored in md5->buffer
00053          * md5->loLen   = num bytes that have been written to STM32 FIFO
00054          */
00055         XMEMSET(md5->buffer, 0, MD5_REG_SIZE);
00056             
00057         md5->buffLen = 0;
00058         md5->loLen = 0;
00059 
00060         /* initialize HASH peripheral */
00061         HASH_DeInit();
00062 
00063         /* configure algo used, algo mode, datatype */
00064         HASH->CR &= ~ (HASH_CR_ALGO | HASH_CR_DATATYPE | HASH_CR_MODE);
00065         HASH->CR |= (HASH_AlgoSelection_MD5 | HASH_AlgoMode_HASH 
00066                  | HASH_DataType_8b);
00067 
00068         /* reset HASH processor */
00069         HASH->CR |= HASH_CR_INIT;
00070     }
00071 
00072     void Md5Update(Md5* md5, const byte* data, word32 len)
00073     {
00074         word32 i = 0;
00075         word32 fill = 0;
00076         word32 diff = 0;
00077 
00078         /* if saved partial block is available */
00079         if (md5->buffLen > 0) {
00080             fill = 4 - md5->buffLen;
00081 
00082             /* if enough data to fill, fill and push to FIFO */
00083             if (fill <= len) {
00084                 XMEMCPY((byte*)md5->buffer + md5->buffLen, data, fill);
00085                 HASH_DataIn(*(uint32_t*)md5->buffer);
00086 
00087                 data += fill;
00088                 len -= fill;
00089                 md5->loLen += 4;
00090                 md5->buffLen = 0;
00091             } else {
00092                 /* append partial to existing stored block */
00093                 XMEMCPY((byte*)md5->buffer + md5->buffLen, data, len);
00094                 md5->buffLen += len;
00095                 return;
00096             }
00097         }
00098 
00099         /* write input block in the IN FIFO */
00100         for (i = 0; i < len; i += 4)
00101         {
00102             diff = len - i;
00103             if (diff < 4) {
00104                 /* store incomplete last block, not yet in FIFO */
00105                 XMEMSET(md5->buffer, 0, MD5_REG_SIZE);
00106                 XMEMCPY((byte*)md5->buffer, data, diff);
00107                 md5->buffLen = diff;
00108             } else {
00109                 HASH_DataIn(*(uint32_t*)data);
00110                 data+=4;
00111             }
00112         }
00113 
00114         /* keep track of total data length thus far */
00115         md5->loLen += (len - md5->buffLen);
00116     }
00117 
00118     void Md5Final(Md5* md5, byte* hash)
00119     {
00120         __IO uint16_t nbvalidbitsdata = 0;
00121 
00122         /* finish reading any trailing bytes into FIFO */
00123         if (md5->buffLen > 0) {
00124             HASH_DataIn(*(uint32_t*)md5->buffer);
00125             md5->loLen += md5->buffLen;
00126         }
00127 
00128         /* calculate number of valid bits in last word of input data */
00129         nbvalidbitsdata = 8 * (md5->loLen % MD5_REG_SIZE);
00130 
00131         /* configure number of valid bits in last word of the data */
00132         HASH_SetLastWordValidBitsNbr(nbvalidbitsdata);
00133 
00134         /* start HASH processor */
00135         HASH_StartDigest();
00136 
00137         /* wait until Busy flag == RESET */
00138         while (HASH_GetFlagStatus(HASH_FLAG_BUSY) != RESET) {}
00139         
00140         /* read message digest */
00141         md5->digest[0] = HASH->HR[0];
00142         md5->digest[1] = HASH->HR[1];
00143         md5->digest[2] = HASH->HR[2];
00144         md5->digest[3] = HASH->HR[3];
00145 
00146         ByteReverseWords(md5->digest, md5->digest, MD5_DIGEST_SIZE);
00147 
00148         XMEMCPY(hash, md5->digest, MD5_DIGEST_SIZE);
00149 
00150         InitMd5(md5);  /* reset state */
00151     }
00152 
00153 #else /* CTaoCrypt software implementation */
00154 
00155 #ifndef min
00156 
00157     static INLINE word32 min(word32 a, word32 b)
00158     {
00159         return a > b ? b : a;
00160     }
00161 
00162 #endif /* min */
00163 
00164 
00165 void InitMd5(Md5* md5)
00166 {
00167     md5->digest[0] = 0x67452301L;
00168     md5->digest[1] = 0xefcdab89L;
00169     md5->digest[2] = 0x98badcfeL;
00170     md5->digest[3] = 0x10325476L;
00171 
00172     md5->buffLen = 0;
00173     md5->loLen   = 0;
00174     md5->hiLen   = 0;
00175 }
00176 
00177 
00178 static void Transform(Md5* md5)
00179 {
00180 #define F1(x, y, z) (z ^ (x & (y ^ z)))
00181 #define F2(x, y, z) F1(z, x, y)
00182 #define F3(x, y, z) (x ^ y ^ z)
00183 #define F4(x, y, z) (y ^ (x | ~z))
00184 
00185 #define MD5STEP(f, w, x, y, z, data, s) \
00186     w = rotlFixed(w + f(x, y, z) + data, s) + x
00187 
00188     /* Copy context->state[] to working vars  */
00189     word32 a = md5->digest[0];
00190     word32 b = md5->digest[1];
00191     word32 c = md5->digest[2];
00192     word32 d = md5->digest[3];
00193 
00194     MD5STEP(F1, a, b, c, d, md5->buffer[0]  + 0xd76aa478,  7);
00195     MD5STEP(F1, d, a, b, c, md5->buffer[1]  + 0xe8c7b756, 12);
00196     MD5STEP(F1, c, d, a, b, md5->buffer[2]  + 0x242070db, 17);
00197     MD5STEP(F1, b, c, d, a, md5->buffer[3]  + 0xc1bdceee, 22);
00198     MD5STEP(F1, a, b, c, d, md5->buffer[4]  + 0xf57c0faf,  7);
00199     MD5STEP(F1, d, a, b, c, md5->buffer[5]  + 0x4787c62a, 12);
00200     MD5STEP(F1, c, d, a, b, md5->buffer[6]  + 0xa8304613, 17);
00201     MD5STEP(F1, b, c, d, a, md5->buffer[7]  + 0xfd469501, 22);
00202     MD5STEP(F1, a, b, c, d, md5->buffer[8]  + 0x698098d8,  7);
00203     MD5STEP(F1, d, a, b, c, md5->buffer[9]  + 0x8b44f7af, 12);
00204     MD5STEP(F1, c, d, a, b, md5->buffer[10] + 0xffff5bb1, 17);
00205     MD5STEP(F1, b, c, d, a, md5->buffer[11] + 0x895cd7be, 22);
00206     MD5STEP(F1, a, b, c, d, md5->buffer[12] + 0x6b901122,  7);
00207     MD5STEP(F1, d, a, b, c, md5->buffer[13] + 0xfd987193, 12);
00208     MD5STEP(F1, c, d, a, b, md5->buffer[14] + 0xa679438e, 17);
00209     MD5STEP(F1, b, c, d, a, md5->buffer[15] + 0x49b40821, 22);
00210 
00211     MD5STEP(F2, a, b, c, d, md5->buffer[1]  + 0xf61e2562,  5);
00212     MD5STEP(F2, d, a, b, c, md5->buffer[6]  + 0xc040b340,  9);
00213     MD5STEP(F2, c, d, a, b, md5->buffer[11] + 0x265e5a51, 14);
00214     MD5STEP(F2, b, c, d, a, md5->buffer[0]  + 0xe9b6c7aa, 20);
00215     MD5STEP(F2, a, b, c, d, md5->buffer[5]  + 0xd62f105d,  5);
00216     MD5STEP(F2, d, a, b, c, md5->buffer[10] + 0x02441453,  9);
00217     MD5STEP(F2, c, d, a, b, md5->buffer[15] + 0xd8a1e681, 14);
00218     MD5STEP(F2, b, c, d, a, md5->buffer[4]  + 0xe7d3fbc8, 20);
00219     MD5STEP(F2, a, b, c, d, md5->buffer[9]  + 0x21e1cde6,  5);
00220     MD5STEP(F2, d, a, b, c, md5->buffer[14] + 0xc33707d6,  9);
00221     MD5STEP(F2, c, d, a, b, md5->buffer[3]  + 0xf4d50d87, 14);
00222     MD5STEP(F2, b, c, d, a, md5->buffer[8]  + 0x455a14ed, 20);
00223     MD5STEP(F2, a, b, c, d, md5->buffer[13] + 0xa9e3e905,  5);
00224     MD5STEP(F2, d, a, b, c, md5->buffer[2]  + 0xfcefa3f8,  9);
00225     MD5STEP(F2, c, d, a, b, md5->buffer[7]  + 0x676f02d9, 14);
00226     MD5STEP(F2, b, c, d, a, md5->buffer[12] + 0x8d2a4c8a, 20);
00227 
00228     MD5STEP(F3, a, b, c, d, md5->buffer[5]  + 0xfffa3942,  4);
00229     MD5STEP(F3, d, a, b, c, md5->buffer[8]  + 0x8771f681, 11);
00230     MD5STEP(F3, c, d, a, b, md5->buffer[11] + 0x6d9d6122, 16);
00231     MD5STEP(F3, b, c, d, a, md5->buffer[14] + 0xfde5380c, 23);
00232     MD5STEP(F3, a, b, c, d, md5->buffer[1]  + 0xa4beea44,  4);
00233     MD5STEP(F3, d, a, b, c, md5->buffer[4]  + 0x4bdecfa9, 11);
00234     MD5STEP(F3, c, d, a, b, md5->buffer[7]  + 0xf6bb4b60, 16);
00235     MD5STEP(F3, b, c, d, a, md5->buffer[10] + 0xbebfbc70, 23);
00236     MD5STEP(F3, a, b, c, d, md5->buffer[13] + 0x289b7ec6,  4);
00237     MD5STEP(F3, d, a, b, c, md5->buffer[0]  + 0xeaa127fa, 11);
00238     MD5STEP(F3, c, d, a, b, md5->buffer[3]  + 0xd4ef3085, 16);
00239     MD5STEP(F3, b, c, d, a, md5->buffer[6]  + 0x04881d05, 23);
00240     MD5STEP(F3, a, b, c, d, md5->buffer[9]  + 0xd9d4d039,  4);
00241     MD5STEP(F3, d, a, b, c, md5->buffer[12] + 0xe6db99e5, 11);
00242     MD5STEP(F3, c, d, a, b, md5->buffer[15] + 0x1fa27cf8, 16);
00243     MD5STEP(F3, b, c, d, a, md5->buffer[2]  + 0xc4ac5665, 23);
00244 
00245     MD5STEP(F4, a, b, c, d, md5->buffer[0]  + 0xf4292244,  6);
00246     MD5STEP(F4, d, a, b, c, md5->buffer[7]  + 0x432aff97, 10);
00247     MD5STEP(F4, c, d, a, b, md5->buffer[14] + 0xab9423a7, 15);
00248     MD5STEP(F4, b, c, d, a, md5->buffer[5]  + 0xfc93a039, 21);
00249     MD5STEP(F4, a, b, c, d, md5->buffer[12] + 0x655b59c3,  6);
00250     MD5STEP(F4, d, a, b, c, md5->buffer[3]  + 0x8f0ccc92, 10);
00251     MD5STEP(F4, c, d, a, b, md5->buffer[10] + 0xffeff47d, 15);
00252     MD5STEP(F4, b, c, d, a, md5->buffer[1]  + 0x85845dd1, 21);
00253     MD5STEP(F4, a, b, c, d, md5->buffer[8]  + 0x6fa87e4f,  6);
00254     MD5STEP(F4, d, a, b, c, md5->buffer[15] + 0xfe2ce6e0, 10);
00255     MD5STEP(F4, c, d, a, b, md5->buffer[6]  + 0xa3014314, 15);
00256     MD5STEP(F4, b, c, d, a, md5->buffer[13] + 0x4e0811a1, 21);
00257     MD5STEP(F4, a, b, c, d, md5->buffer[4]  + 0xf7537e82,  6);
00258     MD5STEP(F4, d, a, b, c, md5->buffer[11] + 0xbd3af235, 10);
00259     MD5STEP(F4, c, d, a, b, md5->buffer[2]  + 0x2ad7d2bb, 15);
00260     MD5STEP(F4, b, c, d, a, md5->buffer[9]  + 0xeb86d391, 21);
00261     
00262     /* Add the working vars back into digest state[]  */
00263     md5->digest[0] += a;
00264     md5->digest[1] += b;
00265     md5->digest[2] += c;
00266     md5->digest[3] += d;
00267 }
00268 
00269 
00270 static INLINE void AddLength(Md5* md5, word32 len)
00271 {
00272     word32 tmp = md5->loLen;
00273     if ( (md5->loLen += len) < tmp)
00274         md5->hiLen++;                       /* carry low to high */
00275 }
00276 
00277 
00278 void Md5Update(Md5* md5, const byte* data, word32 len)
00279 {
00280     /* do block size increments */
00281     byte* local = (byte*)md5->buffer;
00282 
00283     while (len) {
00284         word32 add = min(len, MD5_BLOCK_SIZE - md5->buffLen);
00285         XMEMCPY(&local[md5->buffLen], data, add);
00286 
00287         md5->buffLen += add;
00288         data         += add;
00289         len          -= add;
00290 
00291         if (md5->buffLen == MD5_BLOCK_SIZE) {
00292             #ifdef BIG_ENDIAN_ORDER
00293                 ByteReverseBytes(local, local, MD5_BLOCK_SIZE);
00294             #endif
00295             Transform(md5);
00296             AddLength(md5, MD5_BLOCK_SIZE);
00297             md5->buffLen = 0;
00298         }
00299     }
00300 }
00301 
00302 
00303 void Md5Final(Md5* md5, byte* hash)
00304 {
00305     byte* local = (byte*)md5->buffer;
00306 
00307     AddLength(md5, md5->buffLen);               /* before adding pads */
00308 
00309     local[md5->buffLen++] = 0x80;  /* add 1 */
00310 
00311     /* pad with zeros */
00312     if (md5->buffLen > MD5_PAD_SIZE) {
00313         XMEMSET(&local[md5->buffLen], 0, MD5_BLOCK_SIZE - md5->buffLen);
00314         md5->buffLen += MD5_BLOCK_SIZE - md5->buffLen;
00315 
00316         #ifdef BIG_ENDIAN_ORDER
00317             ByteReverseBytes(local, local, MD5_BLOCK_SIZE);
00318         #endif
00319         Transform(md5);
00320         md5->buffLen = 0;
00321     }
00322     XMEMSET(&local[md5->buffLen], 0, MD5_PAD_SIZE - md5->buffLen);
00323    
00324     /* put lengths in bits */
00325     md5->hiLen = (md5->loLen >> (8*sizeof(md5->loLen) - 3)) + 
00326                  (md5->hiLen << 3);
00327     md5->loLen = md5->loLen << 3;
00328 
00329     /* store lengths */
00330     #ifdef BIG_ENDIAN_ORDER
00331         ByteReverseBytes(local, local, MD5_BLOCK_SIZE);
00332     #endif
00333     /* ! length ordering dependent on digest endian type ! */
00334     XMEMCPY(&local[MD5_PAD_SIZE], &md5->loLen, sizeof(word32));
00335     XMEMCPY(&local[MD5_PAD_SIZE + sizeof(word32)], &md5->hiLen, sizeof(word32));
00336 
00337     Transform(md5);
00338     #ifdef BIG_ENDIAN_ORDER
00339         ByteReverseWords(md5->digest, md5->digest, MD5_DIGEST_SIZE);
00340     #endif
00341     XMEMCPY(hash, md5->digest, MD5_DIGEST_SIZE);
00342 
00343     InitMd5(md5);  /* reset state */
00344 }
00345 
00346 #endif /* STM32F2_HASH */
00347 
00348 #endif /* NO_MD5 */