md5.c

00001 /* md5.c
00002  *
00003  * Copyright (C) 2006-2014 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
00020  */
00021 
00022 
00023 #ifdef HAVE_CONFIG_H
00024     #include <config.h>
00025 #endif
00026 
00027 #include <cyassl/ctaocrypt/settings.h>
00028 
00029 #if !defined(NO_MD5)
00030 
00031 #ifdef CYASSL_PIC32MZ_HASH
00032 #define InitMd5   InitMd5_sw
00033 #define Md5Update Md5Update_sw
00034 #define Md5Final  Md5Final_sw
00035 #endif
00036 
00037 #include <cyassl/ctaocrypt/md5.h>
00038 
00039 #ifdef NO_INLINE
00040     #include <cyassl/ctaocrypt/misc.h>
00041 #else
00042     #include <ctaocrypt/src/misc.c>
00043 #endif
00044 
00045 #ifdef FREESCALE_MMCAU
00046     #include "cau_api.h"
00047     #define XTRANSFORM(S,B)  cau_md5_hash_n((B), 1, (unsigned char*)(S)->digest)
00048 #else
00049     #define XTRANSFORM(S,B)  Transform((S))
00050 #endif
00051 
00052 
00053 #ifdef STM32F2_HASH
00054     /*
00055      * STM32F2 hardware MD5 support through the STM32F2 standard peripheral
00056      * library. Documentation located in STM32F2xx Standard Peripheral Library
00057      * document (See note in README).
00058      */
00059     #include "stm32f2xx.h"
00060 
00061     void InitMd5(Md5* md5)
00062     {
00063         /* STM32F2 struct notes:
00064          * md5->buffer  = first 4 bytes used to hold partial block if needed 
00065          * md5->buffLen = num bytes currently stored in md5->buffer
00066          * md5->loLen   = num bytes that have been written to STM32 FIFO
00067          */
00068         XMEMSET(md5->buffer, 0, MD5_REG_SIZE);
00069             
00070         md5->buffLen = 0;
00071         md5->loLen = 0;
00072 
00073         /* initialize HASH peripheral */
00074         HASH_DeInit();
00075 
00076         /* configure algo used, algo mode, datatype */
00077         HASH->CR &= ~ (HASH_CR_ALGO | HASH_CR_DATATYPE | HASH_CR_MODE);
00078         HASH->CR |= (HASH_AlgoSelection_MD5 | HASH_AlgoMode_HASH 
00079                  | HASH_DataType_8b);
00080 
00081         /* reset HASH processor */
00082         HASH->CR |= HASH_CR_INIT;
00083     }
00084 
00085     void Md5Update(Md5* md5, const byte* data, word32 len)
00086     {
00087         word32 i = 0;
00088         word32 fill = 0;
00089         word32 diff = 0;
00090 
00091         /* if saved partial block is available */
00092         if (md5->buffLen > 0) {
00093             fill = 4 - md5->buffLen;
00094 
00095             /* if enough data to fill, fill and push to FIFO */
00096             if (fill <= len) {
00097                 XMEMCPY((byte*)md5->buffer + md5->buffLen, data, fill);
00098                 HASH_DataIn(*(uint32_t*)md5->buffer);
00099 
00100                 data += fill;
00101                 len -= fill;
00102                 md5->loLen += 4;
00103                 md5->buffLen = 0;
00104             } else {
00105                 /* append partial to existing stored block */
00106                 XMEMCPY((byte*)md5->buffer + md5->buffLen, data, len);
00107                 md5->buffLen += len;
00108                 return;
00109             }
00110         }
00111 
00112         /* write input block in the IN FIFO */
00113         for (i = 0; i < len; i += 4)
00114         {
00115             diff = len - i;
00116             if (diff < 4) {
00117                 /* store incomplete last block, not yet in FIFO */
00118                 XMEMSET(md5->buffer, 0, MD5_REG_SIZE);
00119                 XMEMCPY((byte*)md5->buffer, data, diff);
00120                 md5->buffLen = diff;
00121             } else {
00122                 HASH_DataIn(*(uint32_t*)data);
00123                 data+=4;
00124             }
00125         }
00126 
00127         /* keep track of total data length thus far */
00128         md5->loLen += (len - md5->buffLen);
00129     }
00130 
00131     void Md5Final(Md5* md5, byte* hash)
00132     {
00133         __IO uint16_t nbvalidbitsdata = 0;
00134 
00135         /* finish reading any trailing bytes into FIFO */
00136         if (md5->buffLen > 0) {
00137             HASH_DataIn(*(uint32_t*)md5->buffer);
00138             md5->loLen += md5->buffLen;
00139         }
00140 
00141         /* calculate number of valid bits in last word of input data */
00142         nbvalidbitsdata = 8 * (md5->loLen % MD5_REG_SIZE);
00143 
00144         /* configure number of valid bits in last word of the data */
00145         HASH_SetLastWordValidBitsNbr(nbvalidbitsdata);
00146 
00147         /* start HASH processor */
00148         HASH_StartDigest();
00149 
00150         /* wait until Busy flag == RESET */
00151         while (HASH_GetFlagStatus(HASH_FLAG_BUSY) != RESET) {}
00152         
00153         /* read message digest */
00154         md5->digest[0] = HASH->HR[0];
00155         md5->digest[1] = HASH->HR[1];
00156         md5->digest[2] = HASH->HR[2];
00157         md5->digest[3] = HASH->HR[3];
00158 
00159         ByteReverseWords(md5->digest, md5->digest, MD5_DIGEST_SIZE);
00160 
00161         XMEMCPY(hash, md5->digest, MD5_DIGEST_SIZE);
00162 
00163         InitMd5(md5);  /* reset state */
00164     }
00165 
00166 #else /* CTaoCrypt software implementation */
00167 
00168 #ifndef min
00169 
00170     static INLINE word32 min(word32 a, word32 b)
00171     {
00172         return a > b ? b : a;
00173     }
00174 
00175 #endif /* min */
00176 
00177 
00178 void InitMd5(Md5* md5)
00179 {
00180     md5->digest[0] = 0x67452301L;
00181     md5->digest[1] = 0xefcdab89L;
00182     md5->digest[2] = 0x98badcfeL;
00183     md5->digest[3] = 0x10325476L;
00184 
00185     md5->buffLen = 0;
00186     md5->loLen   = 0;
00187     md5->hiLen   = 0;
00188 }
00189 
00190 #ifndef FREESCALE_MMCAU
00191 
00192 static void Transform(Md5* md5)
00193 {
00194 #define F1(x, y, z) (z ^ (x & (y ^ z)))
00195 #define F2(x, y, z) F1(z, x, y)
00196 #define F3(x, y, z) (x ^ y ^ z)
00197 #define F4(x, y, z) (y ^ (x | ~z))
00198 
00199 #define MD5STEP(f, w, x, y, z, data, s) \
00200     w = rotlFixed(w + f(x, y, z) + data, s) + x
00201 
00202     /* Copy context->state[] to working vars  */
00203     word32 a = md5->digest[0];
00204     word32 b = md5->digest[1];
00205     word32 c = md5->digest[2];
00206     word32 d = md5->digest[3];
00207 
00208     MD5STEP(F1, a, b, c, d, md5->buffer[0]  + 0xd76aa478,  7);
00209     MD5STEP(F1, d, a, b, c, md5->buffer[1]  + 0xe8c7b756, 12);
00210     MD5STEP(F1, c, d, a, b, md5->buffer[2]  + 0x242070db, 17);
00211     MD5STEP(F1, b, c, d, a, md5->buffer[3]  + 0xc1bdceee, 22);
00212     MD5STEP(F1, a, b, c, d, md5->buffer[4]  + 0xf57c0faf,  7);
00213     MD5STEP(F1, d, a, b, c, md5->buffer[5]  + 0x4787c62a, 12);
00214     MD5STEP(F1, c, d, a, b, md5->buffer[6]  + 0xa8304613, 17);
00215     MD5STEP(F1, b, c, d, a, md5->buffer[7]  + 0xfd469501, 22);
00216     MD5STEP(F1, a, b, c, d, md5->buffer[8]  + 0x698098d8,  7);
00217     MD5STEP(F1, d, a, b, c, md5->buffer[9]  + 0x8b44f7af, 12);
00218     MD5STEP(F1, c, d, a, b, md5->buffer[10] + 0xffff5bb1, 17);
00219     MD5STEP(F1, b, c, d, a, md5->buffer[11] + 0x895cd7be, 22);
00220     MD5STEP(F1, a, b, c, d, md5->buffer[12] + 0x6b901122,  7);
00221     MD5STEP(F1, d, a, b, c, md5->buffer[13] + 0xfd987193, 12);
00222     MD5STEP(F1, c, d, a, b, md5->buffer[14] + 0xa679438e, 17);
00223     MD5STEP(F1, b, c, d, a, md5->buffer[15] + 0x49b40821, 22);
00224 
00225     MD5STEP(F2, a, b, c, d, md5->buffer[1]  + 0xf61e2562,  5);
00226     MD5STEP(F2, d, a, b, c, md5->buffer[6]  + 0xc040b340,  9);
00227     MD5STEP(F2, c, d, a, b, md5->buffer[11] + 0x265e5a51, 14);
00228     MD5STEP(F2, b, c, d, a, md5->buffer[0]  + 0xe9b6c7aa, 20);
00229     MD5STEP(F2, a, b, c, d, md5->buffer[5]  + 0xd62f105d,  5);
00230     MD5STEP(F2, d, a, b, c, md5->buffer[10] + 0x02441453,  9);
00231     MD5STEP(F2, c, d, a, b, md5->buffer[15] + 0xd8a1e681, 14);
00232     MD5STEP(F2, b, c, d, a, md5->buffer[4]  + 0xe7d3fbc8, 20);
00233     MD5STEP(F2, a, b, c, d, md5->buffer[9]  + 0x21e1cde6,  5);
00234     MD5STEP(F2, d, a, b, c, md5->buffer[14] + 0xc33707d6,  9);
00235     MD5STEP(F2, c, d, a, b, md5->buffer[3]  + 0xf4d50d87, 14);
00236     MD5STEP(F2, b, c, d, a, md5->buffer[8]  + 0x455a14ed, 20);
00237     MD5STEP(F2, a, b, c, d, md5->buffer[13] + 0xa9e3e905,  5);
00238     MD5STEP(F2, d, a, b, c, md5->buffer[2]  + 0xfcefa3f8,  9);
00239     MD5STEP(F2, c, d, a, b, md5->buffer[7]  + 0x676f02d9, 14);
00240     MD5STEP(F2, b, c, d, a, md5->buffer[12] + 0x8d2a4c8a, 20);
00241 
00242     MD5STEP(F3, a, b, c, d, md5->buffer[5]  + 0xfffa3942,  4);
00243     MD5STEP(F3, d, a, b, c, md5->buffer[8]  + 0x8771f681, 11);
00244     MD5STEP(F3, c, d, a, b, md5->buffer[11] + 0x6d9d6122, 16);
00245     MD5STEP(F3, b, c, d, a, md5->buffer[14] + 0xfde5380c, 23);
00246     MD5STEP(F3, a, b, c, d, md5->buffer[1]  + 0xa4beea44,  4);
00247     MD5STEP(F3, d, a, b, c, md5->buffer[4]  + 0x4bdecfa9, 11);
00248     MD5STEP(F3, c, d, a, b, md5->buffer[7]  + 0xf6bb4b60, 16);
00249     MD5STEP(F3, b, c, d, a, md5->buffer[10] + 0xbebfbc70, 23);
00250     MD5STEP(F3, a, b, c, d, md5->buffer[13] + 0x289b7ec6,  4);
00251     MD5STEP(F3, d, a, b, c, md5->buffer[0]  + 0xeaa127fa, 11);
00252     MD5STEP(F3, c, d, a, b, md5->buffer[3]  + 0xd4ef3085, 16);
00253     MD5STEP(F3, b, c, d, a, md5->buffer[6]  + 0x04881d05, 23);
00254     MD5STEP(F3, a, b, c, d, md5->buffer[9]  + 0xd9d4d039,  4);
00255     MD5STEP(F3, d, a, b, c, md5->buffer[12] + 0xe6db99e5, 11);
00256     MD5STEP(F3, c, d, a, b, md5->buffer[15] + 0x1fa27cf8, 16);
00257     MD5STEP(F3, b, c, d, a, md5->buffer[2]  + 0xc4ac5665, 23);
00258 
00259     MD5STEP(F4, a, b, c, d, md5->buffer[0]  + 0xf4292244,  6);
00260     MD5STEP(F4, d, a, b, c, md5->buffer[7]  + 0x432aff97, 10);
00261     MD5STEP(F4, c, d, a, b, md5->buffer[14] + 0xab9423a7, 15);
00262     MD5STEP(F4, b, c, d, a, md5->buffer[5]  + 0xfc93a039, 21);
00263     MD5STEP(F4, a, b, c, d, md5->buffer[12] + 0x655b59c3,  6);
00264     MD5STEP(F4, d, a, b, c, md5->buffer[3]  + 0x8f0ccc92, 10);
00265     MD5STEP(F4, c, d, a, b, md5->buffer[10] + 0xffeff47d, 15);
00266     MD5STEP(F4, b, c, d, a, md5->buffer[1]  + 0x85845dd1, 21);
00267     MD5STEP(F4, a, b, c, d, md5->buffer[8]  + 0x6fa87e4f,  6);
00268     MD5STEP(F4, d, a, b, c, md5->buffer[15] + 0xfe2ce6e0, 10);
00269     MD5STEP(F4, c, d, a, b, md5->buffer[6]  + 0xa3014314, 15);
00270     MD5STEP(F4, b, c, d, a, md5->buffer[13] + 0x4e0811a1, 21);
00271     MD5STEP(F4, a, b, c, d, md5->buffer[4]  + 0xf7537e82,  6);
00272     MD5STEP(F4, d, a, b, c, md5->buffer[11] + 0xbd3af235, 10);
00273     MD5STEP(F4, c, d, a, b, md5->buffer[2]  + 0x2ad7d2bb, 15);
00274     MD5STEP(F4, b, c, d, a, md5->buffer[9]  + 0xeb86d391, 21);
00275     
00276     /* Add the working vars back into digest state[]  */
00277     md5->digest[0] += a;
00278     md5->digest[1] += b;
00279     md5->digest[2] += c;
00280     md5->digest[3] += d;
00281 }
00282 
00283 #endif /* FREESCALE_MMCAU */
00284 
00285 
00286 static INLINE void AddLength(Md5* md5, word32 len)
00287 {
00288     word32 tmp = md5->loLen;
00289     if ( (md5->loLen += len) < tmp)
00290         md5->hiLen++;                       /* carry low to high */
00291 }
00292 
00293 
00294 void Md5Update(Md5* md5, const byte* data, word32 len)
00295 {
00296     /* do block size increments */
00297     byte* local = (byte*)md5->buffer;
00298 
00299     while (len) {
00300         word32 add = min(len, MD5_BLOCK_SIZE - md5->buffLen);
00301         XMEMCPY(&local[md5->buffLen], data, add);
00302 
00303         md5->buffLen += add;
00304         data         += add;
00305         len          -= add;
00306 
00307         if (md5->buffLen == MD5_BLOCK_SIZE) {
00308             #if defined(BIG_ENDIAN_ORDER) && !defined(FREESCALE_MMCAU)
00309                 ByteReverseWords(md5->buffer, md5->buffer, MD5_BLOCK_SIZE);
00310             #endif
00311             XTRANSFORM(md5, local);
00312             AddLength(md5, MD5_BLOCK_SIZE);
00313             md5->buffLen = 0;
00314         }
00315     }
00316 }
00317 
00318 
00319 void Md5Final(Md5* md5, byte* hash)
00320 {
00321     byte* local = (byte*)md5->buffer;
00322 
00323     AddLength(md5, md5->buffLen);  /* before adding pads */
00324 
00325     local[md5->buffLen++] = 0x80;  /* add 1 */
00326 
00327     /* pad with zeros */
00328     if (md5->buffLen > MD5_PAD_SIZE) {
00329         XMEMSET(&local[md5->buffLen], 0, MD5_BLOCK_SIZE - md5->buffLen);
00330         md5->buffLen += MD5_BLOCK_SIZE - md5->buffLen;
00331 
00332         #if defined(BIG_ENDIAN_ORDER) && !defined(FREESCALE_MMCAU)
00333             ByteReverseWords(md5->buffer, md5->buffer, MD5_BLOCK_SIZE);
00334         #endif
00335         XTRANSFORM(md5, local);
00336         md5->buffLen = 0;
00337     }
00338     XMEMSET(&local[md5->buffLen], 0, MD5_PAD_SIZE - md5->buffLen);
00339    
00340     /* put lengths in bits */
00341     md5->hiLen = (md5->loLen >> (8*sizeof(md5->loLen) - 3)) + 
00342                  (md5->hiLen << 3);
00343     md5->loLen = md5->loLen << 3;
00344 
00345     /* store lengths */
00346     #if defined(BIG_ENDIAN_ORDER) && !defined(FREESCALE_MMCAU)
00347         ByteReverseWords(md5->buffer, md5->buffer, MD5_BLOCK_SIZE);
00348     #endif
00349     /* ! length ordering dependent on digest endian type ! */
00350     XMEMCPY(&local[MD5_PAD_SIZE], &md5->loLen, sizeof(word32));
00351     XMEMCPY(&local[MD5_PAD_SIZE + sizeof(word32)], &md5->hiLen, sizeof(word32));
00352 
00353     XTRANSFORM(md5, local);
00354     #ifdef BIG_ENDIAN_ORDER
00355         ByteReverseWords(md5->digest, md5->digest, MD5_DIGEST_SIZE);
00356     #endif
00357     XMEMCPY(hash, md5->digest, MD5_DIGEST_SIZE);
00358 
00359     InitMd5(md5);  /* reset state */
00360 }
00361 
00362 #endif /* STM32F2_HASH */
00363 
00364 #endif /* NO_MD5 */
00365