LCOV - code coverage report
Current view: top level - src/utils - md5.c (source / functions) Hit Total Coverage
Test: FreeTDS coverage Lines: 117 117 100.0 %
Date: 2025-01-18 12:13:41 Functions: 4 4 100.0 %

          Line data    Source code
       1             : /*
       2             :  * This code implements the MD5 message-digest algorithm.
       3             :  * The algorithm is due to Ron Rivest.  This code was
       4             :  * written by Colin Plumb in 1993, no copyright is claimed.
       5             :  * This code is in the public domain; do with it what you wish.
       6             :  *
       7             :  * Equivalent code is available from RSA Data Security, Inc.
       8             :  * This code has been tested against that, and is equivalent,
       9             :  * except that you don't need to include two pages of legalese
      10             :  * with every copy.
      11             :  *
      12             :  * To compute the message digest of a chunk of bytes, declare an
      13             :  * MD5Context structure, pass it to MD5Init, call MD5Update as
      14             :  * needed on buffers full of bytes, and then call MD5Final, which
      15             :  * will fill a supplied 16-byte array with the digest.
      16             :  */
      17             : 
      18             : /*
      19             :  * File from mhash library (mhash.sourceforge.net)
      20             :  */
      21             : #include <config.h>
      22             : 
      23             : #ifndef HAVE_NETTLE
      24             : 
      25             : #if HAVE_STRING_H
      26             : #include <string.h>
      27             : #endif /* HAVE_STRING_H */
      28             : 
      29             : #include <tds_sysdep_public.h>
      30             : #include <freetds/bytes.h>
      31             : #include <freetds/utils/md5.h>
      32             : 
      33             : #ifndef WORDS_BIGENDIAN
      34             : #define byteReverse(buf, len)   /* Nothing */
      35             : #else
      36             : /*
      37             :  * Note: this code is harmless on little-endian machines.
      38             :  */
      39             : static void byteReverse(uint32_t *buf, unsigned longs)
      40             : {
      41             :     do {
      42             :         *buf = TDS_GET_A4LE(buf);
      43             :         ++buf;
      44             :     } while (--longs);
      45             : }
      46             : #endif
      47             : 
      48             : static void MD5Transform(uint32_t buf[4], const uint32_t in[16]);
      49             : 
      50             : /*
      51             :  * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
      52             :  * initialization constants.
      53             :  */
      54        2158 : void MD5Init(struct MD5Context *ctx)
      55             : {
      56        2158 :     ctx->buf[0] = 0x67452301;
      57        2158 :     ctx->buf[1] = 0xefcdab89;
      58        2158 :     ctx->buf[2] = 0x98badcfe;
      59        2158 :     ctx->buf[3] = 0x10325476;
      60             : 
      61        2158 :     ctx->bytes = 0;
      62        2158 : }
      63             : 
      64             : /*
      65             :  * Update context to reflect the concatenation of another buffer full
      66             :  * of bytes.
      67             :  */
      68        4308 : void MD5Update(struct MD5Context *ctx, unsigned char const *buf, size_t len)
      69             : {
      70             :     register uint32_t t;
      71             : 
      72        4308 :     t = ctx->bytes & 0x3f;       /* Bytes already in shsInfo->data */
      73             : 
      74             :     /* Update bytecount */
      75        4308 :     ctx->bytes += len;
      76             : 
      77             :     /* Handle any leading odd-sized chunks */
      78             : 
      79        4308 :     if (t) {
      80          12 :         unsigned char *p = (unsigned char *) ctx->in + t;
      81             : 
      82          12 :         t = 64 - t;
      83          12 :         if (len < t) {
      84           8 :             memcpy(p, buf, len);
      85           8 :             return;
      86             :         }
      87           4 :         memcpy(p, buf, t);
      88             :         byteReverse(ctx->in, 16);
      89           4 :         MD5Transform(ctx->buf, ctx->in);
      90           4 :         buf += t;
      91           4 :         len -= t;
      92             :     }
      93             :     /* Process data in 64-byte chunks */
      94             : 
      95        6803 :     while (len >= 64) {
      96        2503 :         memcpy(ctx->in, buf, 64);
      97             :         byteReverse(ctx->in, 16);
      98        2503 :         MD5Transform(ctx->buf, ctx->in);
      99        2503 :         buf += 64;
     100        2503 :         len -= 64;
     101             :     }
     102             : 
     103             :     /* Handle any remaining bytes of data. */
     104             : 
     105        4300 :     memcpy(ctx->in, buf, len);
     106             : }
     107             : 
     108             : /*
     109             :  * Final wrapup - pad to 64-byte boundary with the bit pattern 
     110             :  * 1 0* (64-bit count of bits processed, MSB-first)
     111             :  */
     112        2158 : void MD5Final(struct MD5Context *ctx, unsigned char* digest)
     113             : {
     114             :     unsigned int count;
     115             :     unsigned char *p;
     116             : 
     117             :     /* Compute number of bytes mod 64 */
     118        2158 :     count = ctx->bytes & 0x3F;
     119             : 
     120             :     /* Set the first char of padding to 0x80.  This is safe since there is
     121             :        always at least one byte free */
     122        2158 :     p = (unsigned char *) ctx->in + count;
     123        2158 :     *p++ = 0x80;
     124             : 
     125             :     /* Bytes of padding needed to make 64 bytes */
     126        2158 :     count = 64 - 1 - count;
     127             : 
     128             :     /* Pad out to 56 mod 64 */
     129        2158 :     if (count < 8) {
     130             :         /* Two lots of padding:  Pad the first block to 64 bytes */
     131           4 :         memset(p, 0, count);
     132             :         byteReverse(ctx->in, 16);
     133           4 :         MD5Transform(ctx->buf, ctx->in);
     134             : 
     135             :         /* Now fill the next block with 56 bytes */
     136           4 :         memset(ctx->in, 0, 56);
     137             :     } else {
     138             :         /* Pad block to 56 bytes */
     139        2154 :         memset(p, 0, count - 8);
     140             :     }
     141             :     byteReverse(ctx->in, 14);
     142             : 
     143             :     /* Append length in bits and transform */
     144        2158 :     ctx->in[14] = (uint32_t) (ctx->bytes << 3);
     145        2158 :     ctx->in[15] = (uint32_t) (ctx->bytes >> 29);
     146             : 
     147        2158 :     MD5Transform(ctx->buf, ctx->in);
     148             :     byteReverse(ctx->buf, 4);
     149             :     
     150        2158 :     if (digest!=NULL)
     151        2158 :             memcpy(digest, ctx->buf, 16);
     152        2158 :     memset(ctx, 0, sizeof(*ctx));       /* In case it's sensitive */
     153        2158 : }
     154             : 
     155             : /* The four core functions - F1 is optimized somewhat */
     156             : 
     157             : /* #define F1(x, y, z) (x & y | ~x & z) */
     158             : #define F1(x, y, z) (z ^ (x & (y ^ z)))
     159             : #define F2(x, y, z) F1(z, x, y)
     160             : #define F3(x, y, z) (x ^ y ^ z)
     161             : #define F4(x, y, z) (y ^ (x | ~z))
     162             : 
     163             : /* This is the central step in the MD5 algorithm. */
     164             : #define MD5STEP(f, w, x, y, z, data, s) \
     165             :         ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
     166             : 
     167             : /*
     168             :  * The core of the MD5 algorithm, this alters an existing MD5 hash to
     169             :  * reflect the addition of 16 longwords of new data.  MD5Update blocks
     170             :  * the data and converts bytes into longwords for this routine.
     171             :  */
     172        4669 : static void MD5Transform(uint32_t buf[4], const uint32_t in[16])
     173             : {
     174             :     register uint32_t a, b, c, d;
     175             : 
     176        4669 :     a = buf[0];
     177        4669 :     b = buf[1];
     178        4669 :     c = buf[2];
     179        4669 :     d = buf[3];
     180             : 
     181        4669 :     MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
     182        4669 :     MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
     183        4669 :     MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
     184        4669 :     MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
     185        4669 :     MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
     186        4669 :     MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
     187        4669 :     MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
     188        4669 :     MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
     189        4669 :     MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
     190        4669 :     MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
     191        4669 :     MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
     192        4669 :     MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
     193        4669 :     MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
     194        4669 :     MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
     195        4669 :     MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
     196        4669 :     MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
     197             : 
     198        4669 :     MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
     199        4669 :     MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
     200        4669 :     MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
     201        4669 :     MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
     202        4669 :     MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
     203        4669 :     MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
     204        4669 :     MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
     205        4669 :     MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
     206        4669 :     MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
     207        4669 :     MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
     208        4669 :     MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
     209        4669 :     MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
     210        4669 :     MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
     211        4669 :     MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
     212        4669 :     MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
     213        4669 :     MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
     214             : 
     215        4669 :     MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
     216        4669 :     MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
     217        4669 :     MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
     218        4669 :     MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
     219        4669 :     MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
     220        4669 :     MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
     221        4669 :     MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
     222        4669 :     MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
     223        4669 :     MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
     224        4669 :     MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
     225        4669 :     MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
     226        4669 :     MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
     227        4669 :     MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
     228        4669 :     MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
     229        4669 :     MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
     230        4669 :     MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
     231             : 
     232        4669 :     MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
     233        4669 :     MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
     234        4669 :     MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
     235        4669 :     MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
     236        4669 :     MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
     237        4669 :     MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
     238        4669 :     MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
     239        4669 :     MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
     240        4669 :     MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
     241        4669 :     MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
     242        4669 :     MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
     243        4669 :     MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
     244        4669 :     MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
     245        4669 :     MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
     246        4669 :     MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
     247        4669 :     MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
     248             : 
     249        4669 :     buf[0] += a;
     250        4669 :     buf[1] += b;
     251        4669 :     buf[2] += c;
     252        4669 :     buf[3] += d;
     253        4669 : }
     254             : 
     255             : #endif

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