src/add-ons/mail_daemon/outbound_protocols/smtp/md5c.c

   1 /* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
   2  */
   3
   4 /* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
   5 rights reserved.
   6
   7 License to copy and use this software is granted provided that it
   8 is identified as the "RSA Data Security, Inc. MD5 Message-Digest
   9 Algorithm" in all material mentioning or referencing this software
  10 or this function.
  11
  12 License is also granted to make and use derivative works provided
  13 that such works are identified as "derived from the RSA Data
  14 Security, Inc. MD5 Message-Digest Algorithm" in all material
  15 mentioning or referencing the derived work.
  16
  17 RSA Data Security, Inc. makes no representations concerning either
  18 the merchantability of this software or the suitability of this
  19 software for any particular purpose. It is provided "as is"
  20 without express or implied warranty of any kind.
  21
  22 These notices must be retained in any copies of any part of this
  23 documentation and/or software.
  24  */
  25
  26 //#include "config.h"
  27 #include "md5global.h"
  28 #include "md5.h"
  29 #include <string.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32
  33 /* Constants for MD5Transform routine.
  34  */
  35 #define S11 7
  36 #define S12 12
  37 #define S13 17
  38 #define S14 22
  39 #define S21 5
  40 #define S22 9
  41 #define S23 14
  42 #define S24 20
  43 #define S31 4
  44 #define S32 11
  45 #define S33 16
  46 #define S34 23
  47 #define S41 6
  48 #define S42 10
  49 #define S43 15
  50 #define S44 21
  51
  52 static void MD5_Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
  53 static void Encode PROTO_LIST
  54   ((unsigned char *, UINT4 *, unsigned int));
  55 static void Decode PROTO_LIST
  56   ((UINT4 *, unsigned char *, unsigned int));
  57 static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
  58 static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
  59
  60 static unsigned char PADDING[64] = {
  61   0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  62   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  63   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  64 };
  65
  66 /* F, G, H and I are basic MD5 functions.
  67  */
  68 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
  69 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
  70 #define H(x, y, z) ((x) ^ (y) ^ (z))
  71 #define I(x, y, z) ((y) ^ ((x) | (~z)))
  72
  73 /* ROTATE_LEFT rotates x left n bits.
  74  */
  75 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
  76
  77 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
  78 Rotation is separate from addition to prevent recomputation.
  79  */
  80 #define FF(a, b, c, d, x, s, ac) { \
  81  (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
  82  (a) = ROTATE_LEFT ((a), (s)); \
  83  (a) += (b); \
  84   }
  85 #define GG(a, b, c, d, x, s, ac) { \
  86  (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
  87  (a) = ROTATE_LEFT ((a), (s)); \
  88  (a) += (b); \
  89   }
  90 #define HH(a, b, c, d, x, s, ac) { \
  91  (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
  92  (a) = ROTATE_LEFT ((a), (s)); \
  93  (a) += (b); \
  94   }
  95 #define II(a, b, c, d, x, s, ac) { \
  96  (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
  97  (a) = ROTATE_LEFT ((a), (s)); \
  98  (a) += (b); \
  99   }
 100
 101 /* MD5 initialization. Begins an MD5 operation, writing a new context.
 102  */
 103 void MD5_Init (MD5_CTX *context)
 104                                         /* context */
 105 {
 106   context->count[0] = context->count[1] = 0;
 107   /* Load magic initialization constants.
 108 */
 109   context->state[0] = 0x67452301;
 110   context->state[1] = 0xefcdab89;
 111   context->state[2] = 0x98badcfe;
 112   context->state[3] = 0x10325476;
 113 }
 114
 115 /* MD5 block update operation. Continues an MD5 message-digest
 116   operation, processing another message block, and updating the
 117   context.
 118  */
 119 void MD5_Update (MD5_CTX *context, unsigned char *input, unsigned int inputLen)
 120                                         /* context */
 121                                 /* input block */
 122                      /* length of input block */
 123 {
 124   unsigned int i, index, partLen;
 125
 126   /* Compute number of bytes mod 64 */
 127   index = (unsigned int)((context->count[0] >> 3) & 0x3F);
 128
 129   /* Update number of bits */
 130   if ((context->count[0] += ((UINT4)inputLen << 3))
 131    < ((UINT4)inputLen << 3))
 132  context->count[1]++;
 133   context->count[1] += ((UINT4)inputLen >> 29);
 134
 135   partLen = 64 - index;
 136
 137   /* Transform as many times as possible.
 138 */
 139   if (inputLen >= partLen) {
 140  MD5_memcpy
 141    ((POINTER)&context->buffer[index], (POINTER)input, partLen);
 142  MD5_Transform (context->state, context->buffer);
 143
 144  for (i = partLen; i + 63 < inputLen; i += 64)
 145    MD5_Transform (context->state, &input[i]);
 146
 147  index = 0;
 148   }
 149   else
 150  i = 0;
 151
 152   /* Buffer remaining input */
 153   MD5_memcpy
 154  ((POINTER)&context->buffer[index], (POINTER)&input[i],
 155   inputLen-i);
 156 }
 157
 158 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
 159   the message digest and zeroizing the context.
 160  */
 161 void MD5_Final (unsigned char digest[16], MD5_CTX *context)
 162                          /* message digest */
 163                                        /* context */
 164 {
 165   unsigned char bits[8];
 166   unsigned int index, padLen;
 167
 168   /* Save number of bits */
 169   Encode (bits, context->count, 8);
 170
 171   /* Pad out to 56 mod 64.
 172 */
 173   index = (unsigned int)((context->count[0] >> 3) & 0x3f);
 174   padLen = (index < 56) ? (56 - index) : (120 - index);
 175   MD5_Update (context, PADDING, padLen);
 176
 177   /* Append length (before padding) */
 178   MD5_Update (context, bits, 8);
 179   /* Store state in digest */
 180   Encode (digest, context->state, 16);
 181
 182   /* Zeroize sensitive information.
 183 */
 184   MD5_memset ((POINTER)context, 0, sizeof (*context));
 185 }
 186
 187 /* MD5 basic transformation. Transforms state based on block.
 188  */
 189 static void MD5_Transform (UINT4 state[4], unsigned char block[64])
 190 {
 191   UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
 192
 193   Decode (x, block, 64);
 194
 195   /* Round 1 */
 196   FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
 197   FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
 198   FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
 199   FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
 200   FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
 201   FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
 202   FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
 203   FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
 204   FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
 205   FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
 206   FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
 207   FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
 208   FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
 209   FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
 210   FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
 211   FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
 212
 213  /* Round 2 */
 214   GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
 215   GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
 216   GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
 217   GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
 218   GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
 219   GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
 220   GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
 221   GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
 222   GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
 223   GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
 224   GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
 225   GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
 226   GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
 227   GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
 228   GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
 229   GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
 230
 231   /* Round 3 */
 232   HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
 233   HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
 234   HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
 235   HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
 236   HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
 237   HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
 238   HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
 239   HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
 240   HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
 241   HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
 242   HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
 243   HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
 244   HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
 245   HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
 246   HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
 247   HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
 248
 249   /* Round 4 */
 250   II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
 251   II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
 252   II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
 253   II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
 254   II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
 255   II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
 256   II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
 257   II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
 258   II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
 259   II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
 260   II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
 261   II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
 262   II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
 263   II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
 264   II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
 265   II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
 266
 267   state[0] += a;
 268   state[1] += b;
 269   state[2] += c;
 270   state[3] += d;
 271
 272   /* Zeroize sensitive information.
 273 */
 274   MD5_memset ((POINTER)x, 0, sizeof (x));
 275 }
 276
 277 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
 278   a multiple of 4.
 279  */
 280 static void Encode (unsigned char *output, UINT4 *input, unsigned int len)
 281 {
 282   unsigned int i, j;
 283
 284   for (i = 0, j = 0; j < len; i++, j += 4) {
 285  output[j] = (unsigned char)(input[i] & 0xff);
 286  output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
 287  output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
 288  output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
 289   }
 290 }
 291
 292 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
 293   a multiple of 4.
 294  */
 295 static void Decode (UINT4 *output, unsigned char *input, unsigned int len)
 296 {
 297   unsigned int i, j;
 298
 299   for (i = 0, j = 0; j < len; i++, j += 4)
 300  output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
 301    (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
 302 }
 303
 304 /* Note: Replace "for loop" with standard memcpy if possible.
 305  */
 306
 307 static void MD5_memcpy (POINTER output, POINTER input, unsigned int len)
 308 {
 309   unsigned int i;
 310
 311   for (i = 0; i < len; i++)
 312  output[i] = input[i];
 313 }
 314
 315 /* Note: Replace "for loop" with standard memset if possible.
 316  */
 317 static void MD5_memset (POINTER output, int value, unsigned int len)
 318 {
 319   unsigned int i;
 320
 321   for (i = 0; i < len; i++)
 322  ((char *)output)[i] = (char)value;
 323 }