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      1 
      2 
      3 /*
      4  ***********************************************************************
      5  ** md5.c -- the source code for MD5 routines                         **
      6  ** RSA Data Security, Inc. MD5 Message-Digest Algorithm              **
      7  ** Created: 2/17/90 RLR                                              **
      8  ** Revised: 1/91 SRD,AJ,BSK,JT Reference C ver., 7/10 constant corr. **
      9  ***********************************************************************
     10  */
     11 
     12 /*
     13  ***********************************************************************
     14  ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved.  **
     15  **                                                                   **
     16  ** License to copy and use this software is granted provided that    **
     17  ** it is identified as the "RSA Data Security, Inc. MD5 Message-     **
     18  ** Digest Algorithm" in all material mentioning or referencing this  **
     19  ** software or this function.                                        **
     20  **                                                                   **
     21  ** License is also granted to make and use derivative works          **
     22  ** provided that such works are identified as "derived from the RSA  **
     23  ** Data Security, Inc. MD5 Message-Digest Algorithm" in all          **
     24  ** material mentioning or referencing the derived work.              **
     25  **                                                                   **
     26  ** RSA Data Security, Inc. makes no representations concerning       **
     27  ** either the merchantability of this software or the suitability    **
     28  ** of this software for any particular purpose.  It is provided "as  **
     29  ** is" without express or implied warranty of any kind.              **
     30  **                                                                   **
     31  ** These notices must be retained in any copies of any part of this  **
     32  ** documentation and/or software.                                    **
     33  ***********************************************************************
     34  */
     35 
     36 #include <string.h>
     37 #include "md5.h"
     38 
     39 /*
     40  ***********************************************************************
     41  **  Message-digest routines:                                         **
     42  **  To form the message digest for a message M                       **
     43  **    (1) Initialize a context buffer mdContext using MD5_Init       **
     44  **    (2) Call MD5_Update on mdContext and M                         **
     45  **    (3) Call MD5_Final on mdContext                                **
     46  **  The message digest is now in mdContext->digest[0...15]           **
     47  ***********************************************************************
     48  */
     49 
     50 /* forward declaration */
     51 static void Transform ();
     52 
     53 static unsigned char PADDING[64] = {
     54   0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     55   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     56   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     57   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     58   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     59   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     60   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     61   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
     62 };
     63 
     64 /* F, G, H and I are basic MD5 functions */
     65 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
     66 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
     67 #define H(x, y, z) ((x) ^ (y) ^ (z))
     68 #define I(x, y, z) ((y) ^ ((x) | (~z)))
     69 
     70 /* ROTATE_LEFT rotates x left n bits */
     71 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
     72 
     73 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
     74 /* Rotation is separate from addition to prevent recomputation */
     75 #define FF(a, b, c, d, x, s, ac) \
     76   {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
     77    (a) = ROTATE_LEFT ((a), (s)); \
     78    (a) += (b); \
     79   }
     80 #define GG(a, b, c, d, x, s, ac) \
     81   {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
     82    (a) = ROTATE_LEFT ((a), (s)); \
     83    (a) += (b); \
     84   }
     85 #define HH(a, b, c, d, x, s, ac) \
     86   {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
     87    (a) = ROTATE_LEFT ((a), (s)); \
     88    (a) += (b); \
     89   }
     90 #define II(a, b, c, d, x, s, ac) \
     91   {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
     92    (a) = ROTATE_LEFT ((a), (s)); \
     93    (a) += (b); \
     94   }
     95 
     96 #ifdef __STDC__
     97 #define UL(x)	x##U
     98 #else
     99 #define UL(x)	x
    100 #endif
    101 
    102 /* The routine MD5_Init initializes the message-digest context
    103    mdContext. All fields are set to zero.
    104  */
    105 void MD5_Init (mdContext)
    106 MD5_CTX *mdContext;
    107 {
    108   mdContext->i[0] = mdContext->i[1] = (UINT4)0;
    109 
    110   /* Load magic initialization constants.
    111    */
    112   mdContext->buf[0] = (UINT4)0x67452301;
    113   mdContext->buf[1] = (UINT4)0xefcdab89;
    114   mdContext->buf[2] = (UINT4)0x98badcfe;
    115   mdContext->buf[3] = (UINT4)0x10325476;
    116 }
    117 
    118 /* The routine MD5Update updates the message-digest context to
    119    account for the presence of each of the characters inBuf[0..inLen-1]
    120    in the message whose digest is being computed.
    121  */
    122 void MD5_Update (mdContext, inBuf, inLen)
    123 MD5_CTX *mdContext;
    124 unsigned char *inBuf;
    125 unsigned int inLen;
    126 {
    127   UINT4 in[16];
    128   int mdi;
    129   unsigned int i, ii;
    130 
    131   /* compute number of bytes mod 64 */
    132   mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
    133 
    134   /* update number of bits */
    135   if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0])
    136     mdContext->i[1]++;
    137   mdContext->i[0] += ((UINT4)inLen << 3);
    138   mdContext->i[1] += ((UINT4)inLen >> 29);
    139 
    140   while (inLen--) {
    141     /* add new character to buffer, increment mdi */
    142     mdContext->in[mdi++] = *inBuf++;
    143 
    144     /* transform if necessary */
    145     if (mdi == 0x40) {
    146       for (i = 0, ii = 0; i < 16; i++, ii += 4)
    147         in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
    148                 (((UINT4)mdContext->in[ii+2]) << 16) |
    149                 (((UINT4)mdContext->in[ii+1]) << 8) |
    150                 ((UINT4)mdContext->in[ii]);
    151       Transform (mdContext->buf, in);
    152       mdi = 0;
    153     }
    154   }
    155 }
    156 
    157 /* The routine MD5Final terminates the message-digest computation and
    158    ends with the desired message digest in mdContext->digest[0...15].
    159  */
    160 void MD5_Final (hash, mdContext)
    161 unsigned char hash[];
    162 MD5_CTX *mdContext;
    163 {
    164   UINT4 in[16];
    165   int mdi;
    166   unsigned int i, ii;
    167   unsigned int padLen;
    168 
    169   /* save number of bits */
    170   in[14] = mdContext->i[0];
    171   in[15] = mdContext->i[1];
    172 
    173   /* compute number of bytes mod 64 */
    174   mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
    175 
    176   /* pad out to 56 mod 64 */
    177   padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
    178   MD5_Update (mdContext, PADDING, padLen);
    179 
    180   /* append length in bits and transform */
    181   for (i = 0, ii = 0; i < 14; i++, ii += 4)
    182     in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
    183             (((UINT4)mdContext->in[ii+2]) << 16) |
    184             (((UINT4)mdContext->in[ii+1]) << 8) |
    185             ((UINT4)mdContext->in[ii]);
    186   Transform (mdContext->buf, in);
    187 
    188   /* store buffer in digest */
    189   for (i = 0, ii = 0; i < 4; i++, ii += 4) {
    190     mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
    191     mdContext->digest[ii+1] =
    192       (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
    193     mdContext->digest[ii+2] =
    194       (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
    195     mdContext->digest[ii+3] =
    196       (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
    197   }
    198   memcpy(hash, mdContext->digest, 16);
    199 }
    200 
    201 /* Basic MD5 step. Transforms buf based on in.
    202  */
    203 static void Transform (buf, in)
    204 UINT4 *buf;
    205 UINT4 *in;
    206 {
    207   UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
    208 
    209   /* Round 1 */
    210 #define S11 7
    211 #define S12 12
    212 #define S13 17
    213 #define S14 22
    214   FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */
    215   FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */
    216   FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */
    217   FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */
    218   FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */
    219   FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */
    220   FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */
    221   FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */
    222   FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */
    223   FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */
    224   FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */
    225   FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */
    226   FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */
    227   FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */
    228   FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */
    229   FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */
    230 
    231   /* Round 2 */
    232 #define S21 5
    233 #define S22 9
    234 #define S23 14
    235 #define S24 20
    236   GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */
    237   GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */
    238   GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */
    239   GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */
    240   GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */
    241   GG ( d, a, b, c, in[10], S22, UL(  38016083)); /* 22 */
    242   GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */
    243   GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */
    244   GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */
    245   GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */
    246   GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */
    247   GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */
    248   GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */
    249   GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */
    250   GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */
    251   GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */
    252 
    253   /* Round 3 */
    254 #define S31 4
    255 #define S32 11
    256 #define S33 16
    257 #define S34 23
    258   HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */
    259   HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */
    260   HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */
    261   HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */
    262   HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */
    263   HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */
    264   HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */
    265   HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */
    266   HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */
    267   HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */
    268   HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */
    269   HH ( b, c, d, a, in[ 6], S34, UL(  76029189)); /* 44 */
    270   HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */
    271   HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */
    272   HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */
    273   HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */
    274 
    275   /* Round 4 */
    276 #define S41 6
    277 #define S42 10
    278 #define S43 15
    279 #define S44 21
    280   II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */
    281   II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */
    282   II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */
    283   II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */
    284   II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */
    285   II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */
    286   II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */
    287   II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */
    288   II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */
    289   II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */
    290   II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */
    291   II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */
    292   II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */
    293   II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */
    294   II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */
    295   II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */
    296 
    297   buf[0] += a;
    298   buf[1] += b;
    299   buf[2] += c;
    300   buf[3] += d;
    301 }
    302 
    303 /*
    304  ***********************************************************************
    305  ** End of md5.c                                                      **
    306  ******************************** (cut) ********************************
    307  */
    308