1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/md5/md5c.c	Fri Sep 26 17:05:23 2008 +0200
     1.3 @@ -0,0 +1,334 @@
     1.4 +/* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
     1.5 + */
     1.6 +
     1.7 +/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
     1.8 +rights reserved.
     1.9 +
    1.10 +License to copy and use this software is granted provided that it
    1.11 +is identified as the "RSA Data Security, Inc. MD5 Message-Digest
    1.12 +Algorithm" in all material mentioning or referencing this software
    1.13 +or this function.
    1.14 +
    1.15 +License is also granted to make and use derivative works provided
    1.16 +that such works are identified as "derived from the RSA Data
    1.17 +Security, Inc. MD5 Message-Digest Algorithm" in all material
    1.18 +mentioning or referencing the derived work.
    1.19 +
    1.20 +RSA Data Security, Inc. makes no representations concerning either
    1.21 +the merchantability of this software or the suitability of this
    1.22 +software for any particular purpose. It is provided "as is"
    1.23 +without express or implied warranty of any kind.
    1.24 +
    1.25 +These notices must be retained in any copies of any part of this
    1.26 +documentation and/or software.
    1.27 + */
    1.28 +
    1.29 +#include "global.h"
    1.30 +#include "md5.h"
    1.31 +
    1.32 +/* Constants for MD5Transform routine.
    1.33 + */
    1.34 +#define S11 7
    1.35 +#define S12 12
    1.36 +#define S13 17
    1.37 +#define S14 22
    1.38 +#define S21 5
    1.39 +#define S22 9
    1.40 +#define S23 14
    1.41 +#define S24 20
    1.42 +#define S31 4
    1.43 +#define S32 11
    1.44 +#define S33 16
    1.45 +#define S34 23
    1.46 +#define S41 6
    1.47 +#define S42 10
    1.48 +#define S43 15
    1.49 +#define S44 21
    1.50 +
    1.51 +static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
    1.52 +static void Encode PROTO_LIST
    1.53 +  ((unsigned char *, UINT4 *, unsigned int));
    1.54 +static void Decode PROTO_LIST
    1.55 +  ((UINT4 *, unsigned char *, unsigned int));
    1.56 +static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
    1.57 +static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
    1.58 +
    1.59 +static unsigned char PADDING[64] = {
    1.60 +  0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1.61 +  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1.62 +  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
    1.63 +};
    1.64 +
    1.65 +/* F, G, H and I are basic MD5 functions.
    1.66 + */
    1.67 +#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
    1.68 +#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
    1.69 +#define H(x, y, z) ((x) ^ (y) ^ (z))
    1.70 +#define I(x, y, z) ((y) ^ ((x) | (~z)))
    1.71 +
    1.72 +/* ROTATE_LEFT rotates x left n bits.
    1.73 + */
    1.74 +#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
    1.75 +
    1.76 +/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
    1.77 +Rotation is separate from addition to prevent recomputation.
    1.78 + */
    1.79 +#define FF(a, b, c, d, x, s, ac) { \
    1.80 + (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
    1.81 + (a) = ROTATE_LEFT ((a), (s)); \
    1.82 + (a) += (b); \
    1.83 +  }
    1.84 +#define GG(a, b, c, d, x, s, ac) { \
    1.85 + (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
    1.86 + (a) = ROTATE_LEFT ((a), (s)); \
    1.87 + (a) += (b); \
    1.88 +  }
    1.89 +#define HH(a, b, c, d, x, s, ac) { \
    1.90 + (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
    1.91 + (a) = ROTATE_LEFT ((a), (s)); \
    1.92 + (a) += (b); \
    1.93 +  }
    1.94 +#define II(a, b, c, d, x, s, ac) { \
    1.95 + (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
    1.96 + (a) = ROTATE_LEFT ((a), (s)); \
    1.97 + (a) += (b); \
    1.98 +  }
    1.99 +
   1.100 +/* MD5 initialization. Begins an MD5 operation, writing a new context.
   1.101 + */
   1.102 +void MD5Init (context)
   1.103 +MD5_CTX *context;                                        /* context */
   1.104 +{
   1.105 +  context->count[0] = context->count[1] = 0;
   1.106 +  /* Load magic initialization constants.
   1.107 +*/
   1.108 +  context->state[0] = 0x67452301;
   1.109 +  context->state[1] = 0xefcdab89;
   1.110 +  context->state[2] = 0x98badcfe;
   1.111 +  context->state[3] = 0x10325476;
   1.112 +}
   1.113 +
   1.114 +/* MD5 block update operation. Continues an MD5 message-digest
   1.115 +  operation, processing another message block, and updating the
   1.116 +  context.
   1.117 + */
   1.118 +void MD5Update (context, input, inputLen)
   1.119 +MD5_CTX *context;                                        /* context */
   1.120 +unsigned char *input;                                /* input block */
   1.121 +unsigned int inputLen;                     /* length of input block */
   1.122 +{
   1.123 +  unsigned int i, index, partLen;
   1.124 +
   1.125 +  /* Compute number of bytes mod 64 */
   1.126 +  index = (unsigned int)((context->count[0] >> 3) & 0x3F);
   1.127 +
   1.128 +  /* Update number of bits */
   1.129 +  if ((context->count[0] += ((UINT4)inputLen << 3))
   1.130 +   < ((UINT4)inputLen << 3))
   1.131 + context->count[1]++;
   1.132 +  context->count[1] += ((UINT4)inputLen >> 29);
   1.133 +
   1.134 +  partLen = 64 - index;
   1.135 +
   1.136 +  /* Transform as many times as possible.
   1.137 +*/
   1.138 +  if (inputLen >= partLen) {
   1.139 + MD5_memcpy
   1.140 +   ((POINTER)&context->buffer[index], (POINTER)input, partLen);
   1.141 + MD5Transform (context->state, context->buffer);
   1.142 +
   1.143 + for (i = partLen; i + 63 < inputLen; i += 64)
   1.144 +   MD5Transform (context->state, &input[i]);
   1.145 +
   1.146 + index = 0;
   1.147 +  }
   1.148 +  else
   1.149 + i = 0;
   1.150 +
   1.151 +  /* Buffer remaining input */
   1.152 +  MD5_memcpy
   1.153 + ((POINTER)&context->buffer[index], (POINTER)&input[i],
   1.154 +  inputLen-i);
   1.155 +}
   1.156 +
   1.157 +/* MD5 finalization. Ends an MD5 message-digest operation, writing the
   1.158 +  the message digest and zeroizing the context.
   1.159 + */
   1.160 +void MD5Final (digest, context)
   1.161 +unsigned char digest[16];                         /* message digest */
   1.162 +MD5_CTX *context;                                       /* context */
   1.163 +{
   1.164 +  unsigned char bits[8];
   1.165 +  unsigned int index, padLen;
   1.166 +
   1.167 +  /* Save number of bits */
   1.168 +  Encode (bits, context->count, 8);
   1.169 +
   1.170 +  /* Pad out to 56 mod 64.
   1.171 +*/
   1.172 +  index = (unsigned int)((context->count[0] >> 3) & 0x3f);
   1.173 +  padLen = (index < 56) ? (56 - index) : (120 - index);
   1.174 +  MD5Update (context, PADDING, padLen);
   1.175 +
   1.176 +  /* Append length (before padding) */
   1.177 +  MD5Update (context, bits, 8);
   1.178 +
   1.179 +  /* Store state in digest */
   1.180 +  Encode (digest, context->state, 16);
   1.181 +
   1.182 +  /* Zeroize sensitive information.
   1.183 +*/
   1.184 +  MD5_memset ((POINTER)context, 0, sizeof (*context));
   1.185 +}
   1.186 +
   1.187 +/* MD5 basic transformation. Transforms state based on block.
   1.188 + */
   1.189 +static void MD5Transform (state, block)
   1.190 +UINT4 state[4];
   1.191 +unsigned char block[64];
   1.192 +{
   1.193 +  UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
   1.194 +
   1.195 +  Decode (x, block, 64);
   1.196 +
   1.197 +  /* Round 1 */
   1.198 +  FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
   1.199 +  FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
   1.200 +  FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
   1.201 +  FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
   1.202 +  FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
   1.203 +  FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
   1.204 +  FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
   1.205 +  FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
   1.206 +  FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
   1.207 +  FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
   1.208 +  FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
   1.209 +  FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
   1.210 +  FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
   1.211 +  FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
   1.212 +  FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
   1.213 +  FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
   1.214 +
   1.215 + /* Round 2 */
   1.216 +  GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
   1.217 +  GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
   1.218 +  GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
   1.219 +  GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
   1.220 +  GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
   1.221 +  GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
   1.222 +  GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
   1.223 +  GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
   1.224 +  GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
   1.225 +  GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
   1.226 +  GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
   1.227 +  GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
   1.228 +  GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
   1.229 +  GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
   1.230 +  GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
   1.231 +  GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
   1.232 +
   1.233 +  /* Round 3 */
   1.234 +  HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
   1.235 +  HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
   1.236 +  HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
   1.237 +  HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
   1.238 +  HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
   1.239 +  HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
   1.240 +  HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
   1.241 +  HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
   1.242 +  HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
   1.243 +  HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
   1.244 +  HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
   1.245 +  HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
   1.246 +  HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
   1.247 +  HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
   1.248 +  HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
   1.249 +  HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
   1.250 +
   1.251 +  /* Round 4 */
   1.252 +  II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
   1.253 +  II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
   1.254 +  II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
   1.255 +  II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
   1.256 +  II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
   1.257 +  II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
   1.258 +  II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
   1.259 +  II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
   1.260 +  II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
   1.261 +  II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
   1.262 +  II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
   1.263 +  II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
   1.264 +  II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
   1.265 +  II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
   1.266 +  II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
   1.267 +  II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
   1.268 +
   1.269 +  state[0] += a;
   1.270 +  state[1] += b;
   1.271 +  state[2] += c;
   1.272 +  state[3] += d;
   1.273 +
   1.274 +  /* Zeroize sensitive information.
   1.275 +*/
   1.276 +  MD5_memset ((POINTER)x, 0, sizeof (x));
   1.277 +}
   1.278 +
   1.279 +/* Encodes input (UINT4) into output (unsigned char). Assumes len is
   1.280 +  a multiple of 4.
   1.281 + */
   1.282 +static void Encode (output, input, len)
   1.283 +unsigned char *output;
   1.284 +UINT4 *input;
   1.285 +unsigned int len;
   1.286 +{
   1.287 +  unsigned int i, j;
   1.288 +
   1.289 +  for (i = 0, j = 0; j < len; i++, j += 4) {
   1.290 + output[j] = (unsigned char)(input[i] & 0xff);
   1.291 + output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
   1.292 + output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
   1.293 + output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
   1.294 +  }
   1.295 +}
   1.296 +
   1.297 +/* Decodes input (unsigned char) into output (UINT4). Assumes len is
   1.298 +  a multiple of 4.
   1.299 + */
   1.300 +static void Decode (output, input, len)
   1.301 +UINT4 *output;
   1.302 +unsigned char *input;
   1.303 +unsigned int len;
   1.304 +{
   1.305 +  unsigned int i, j;
   1.306 +
   1.307 +  for (i = 0, j = 0; j < len; i++, j += 4)
   1.308 + output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
   1.309 +   (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
   1.310 +}
   1.311 +
   1.312 +/* Note: Replace "for loop" with standard memcpy if possible.
   1.313 + */
   1.314 +
   1.315 +static void MD5_memcpy (output, input, len)
   1.316 +POINTER output;
   1.317 +POINTER input;
   1.318 +unsigned int len;
   1.319 +{
   1.320 +  unsigned int i;
   1.321 +
   1.322 +  for (i = 0; i < len; i++)
   1.323 +    output[i] = input[i];
   1.324 +}
   1.325 +
   1.326 +/* Note: Replace "for loop" with standard memset if possible.
   1.327 + */
   1.328 +static void MD5_memset (output, value, len)
   1.329 +POINTER output;
   1.330 +int value;
   1.331 +unsigned int len;
   1.332 +{
   1.333 +  unsigned int i;
   1.334 +
   1.335 +  for (i = 0; i < len; i++)
   1.336 + ((char *)output)[i] = (char)value;
   1.337 +}