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4758 right-hear 1 
/*
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 **********************************************************************
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 ** md5.c                                                            **
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 ** RSA Data Security, Inc. MD5 Message Digest Algorithm             **
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 ** Created: 2/17/90 RLR                                             **
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 ** Revised: 1/91 SRD,AJ,BSK,JT Reference C Version                  **
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 **********************************************************************
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 */
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10 
/*
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 **********************************************************************
12 
 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. **
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 **                                                                  **
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 ** License to copy and use this software is granted provided that   **
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 ** it is identified as the "RSA Data Security, Inc. MD5 Message     **
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 ** Digest Algorithm" in all material mentioning or referencing this **
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 ** software or this function.                                       **
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 **                                                                  **
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 ** License is also granted to make and use derivative works         **
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 ** provided that such works are identified as "derived from the RSA **
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 ** Data Security, Inc. MD5 Message Digest Algorithm" in all         **
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 ** material mentioning or referencing the derived work.             **
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 **                                                                  **
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 ** RSA Data Security, Inc. makes no representations concerning      **
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 ** either the merchantability of this software or the suitability   **
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 ** of this software for any particular purpose.  It is provided "as **
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 ** is" without express or implied warranty of any kind.             **
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 **                                                                  **
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 ** These notices must be retained in any copies of any part of this **
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 ** documentation and/or software.                                   **
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 **********************************************************************
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 */
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/* -- include the following line if the md5.h header file is separate -- */
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#include "md5.h"
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/* forward declaration */
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static void Transform ();
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static unsigned char PADDING[64] = {
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  0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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51 
/* F, G and H are basic MD5 functions: selection, majority, parity */
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#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
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#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
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#define H(x, y, z) ((x) ^ (y) ^ (z))
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#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE_LEFT rotates x left n bits */
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#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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60 
/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
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/* Rotation is separate from addition to prevent recomputation */
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#define FF(a, b, c, d, x, s, ac) \
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  {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
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   (a) = ROTATE_LEFT ((a), (s)); \
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   (a) += (b); \
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  }
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#define GG(a, b, c, d, x, s, ac) \
68 
  {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
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   (a) = ROTATE_LEFT ((a), (s)); \
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   (a) += (b); \
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  }
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#define HH(a, b, c, d, x, s, ac) \
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  {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
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   (a) = ROTATE_LEFT ((a), (s)); \
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   (a) += (b); \
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  }
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#define II(a, b, c, d, x, s, ac) \
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  {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
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   (a) = ROTATE_LEFT ((a), (s)); \
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   (a) += (b); \
81 
  }
82 
 
83 
void MD5Init (mdContext)
84 
MD5_CTX *mdContext;
85 
{
86 
  mdContext->i[0] = mdContext->i[1] = (UINT4)0;
87 
 
88 
  /* Load magic initialization constants.
89 
   */
90 
  mdContext->buf[0] = (UINT4)0x67452301;
91 
  mdContext->buf[1] = (UINT4)0xefcdab89;
92 
  mdContext->buf[2] = (UINT4)0x98badcfe;
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  mdContext->buf[3] = (UINT4)0x10325476;
94 
}
95 
 
96 
void MD5Update (mdContext, inBuf, inLen)
97 
MD5_CTX *mdContext;
98 
unsigned char *inBuf;
99 
unsigned int inLen;
100 
{
101 
  UINT4 in[16];
102 
  int mdi;
103 
  unsigned int i, ii;
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105 
  /* compute number of bytes mod 64 */
106 
  mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
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108 
  /* update number of bits */
109 
  if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0])
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    mdContext->i[1]++;
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  mdContext->i[0] += ((UINT4)inLen << 3);
112 
  mdContext->i[1] += ((UINT4)inLen >> 29);
113 
 
114 
  while (inLen--) {
115 
    /* add new character to buffer, increment mdi */
116 
    mdContext->in[mdi++] = *inBuf++;
117 
 
118 
    /* transform if necessary */
119 
    if (mdi == 0x40) {
120 
      for (i = 0, ii = 0; i < 16; i++, ii += 4)
121 
        in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
122 
                (((UINT4)mdContext->in[ii+2]) << 16) |
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                (((UINT4)mdContext->in[ii+1]) << 8) |
124 
                ((UINT4)mdContext->in[ii]);
125 
      Transform (mdContext->buf, in);
126 
      mdi = 0;
127 
    }
128 
  }
129 
}
130 
 
131 
void MD5Final (mdContext)
132 
MD5_CTX *mdContext;
133 
{
134 
  UINT4 in[16];
135 
  int mdi;
136 
  unsigned int i, ii;
137 
  unsigned int padLen;
138 
 
139 
  /* save number of bits */
140 
  in[14] = mdContext->i[0];
141 
  in[15] = mdContext->i[1];
142 
 
143 
  /* compute number of bytes mod 64 */
144 
  mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
145 
 
146 
  /* pad out to 56 mod 64 */
147 
  padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
148 
  MD5Update (mdContext, PADDING, padLen);
149 
 
150 
  /* append length in bits and transform */
151 
  for (i = 0, ii = 0; i < 14; i++, ii += 4)
152 
    in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
153 
            (((UINT4)mdContext->in[ii+2]) << 16) |
154 
            (((UINT4)mdContext->in[ii+1]) << 8) |
155 
            ((UINT4)mdContext->in[ii]);
156 
  Transform (mdContext->buf, in);
157 
 
158 
  /* store buffer in digest */
159 
  for (i = 0, ii = 0; i < 4; i++, ii += 4) {
160 
    mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
161 
    mdContext->digest[ii+1] =
162 
      (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
163 
    mdContext->digest[ii+2] =
164 
      (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
165 
    mdContext->digest[ii+3] =
166 
      (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
167 
  }
168 
}
169 
 
170 
/* Basic MD5 step. Transform buf based on in.
171 
 */
172 
static void Transform (buf, in)
173 
UINT4 *buf;
174 
UINT4 *in;
175 
{
176 
  UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
177 
 
178 
  /* Round 1 */
179 
#define S11 7
180 
#define S12 12
181 
#define S13 17
182 
#define S14 22
183 
  FF ( a, b, c, d, in[ 0], S11, 3614090360); /* 1 */
184 
  FF ( d, a, b, c, in[ 1], S12, 3905402710); /* 2 */
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  FF ( c, d, a, b, in[ 2], S13,  606105819); /* 3 */
186 
  FF ( b, c, d, a, in[ 3], S14, 3250441966); /* 4 */
187 
  FF ( a, b, c, d, in[ 4], S11, 4118548399); /* 5 */
188 
  FF ( d, a, b, c, in[ 5], S12, 1200080426); /* 6 */
189 
  FF ( c, d, a, b, in[ 6], S13, 2821735955); /* 7 */
190 
  FF ( b, c, d, a, in[ 7], S14, 4249261313); /* 8 */
191 
  FF ( a, b, c, d, in[ 8], S11, 1770035416); /* 9 */
192 
  FF ( d, a, b, c, in[ 9], S12, 2336552879); /* 10 */
193 
  FF ( c, d, a, b, in[10], S13, 4294925233); /* 11 */
194 
  FF ( b, c, d, a, in[11], S14, 2304563134); /* 12 */
195 
  FF ( a, b, c, d, in[12], S11, 1804603682); /* 13 */
196 
  FF ( d, a, b, c, in[13], S12, 4254626195); /* 14 */
197 
  FF ( c, d, a, b, in[14], S13, 2792965006); /* 15 */
198 
  FF ( b, c, d, a, in[15], S14, 1236535329); /* 16 */
199 
 
200 
  /* Round 2 */
201 
#define S21 5
202 
#define S22 9
203 
#define S23 14
204 
#define S24 20
205 
  GG ( a, b, c, d, in[ 1], S21, 4129170786); /* 17 */
206 
  GG ( d, a, b, c, in[ 6], S22, 3225465664); /* 18 */
207 
  GG ( c, d, a, b, in[11], S23,  643717713); /* 19 */
208 
  GG ( b, c, d, a, in[ 0], S24, 3921069994); /* 20 */
209 
  GG ( a, b, c, d, in[ 5], S21, 3593408605); /* 21 */
210 
  GG ( d, a, b, c, in[10], S22,   38016083); /* 22 */
211 
  GG ( c, d, a, b, in[15], S23, 3634488961); /* 23 */
212 
  GG ( b, c, d, a, in[ 4], S24, 3889429448); /* 24 */
213 
  GG ( a, b, c, d, in[ 9], S21,  568446438); /* 25 */
214 
  GG ( d, a, b, c, in[14], S22, 3275163606); /* 26 */
215 
  GG ( c, d, a, b, in[ 3], S23, 4107603335); /* 27 */
216 
  GG ( b, c, d, a, in[ 8], S24, 1163531501); /* 28 */
217 
  GG ( a, b, c, d, in[13], S21, 2850285829); /* 29 */
218 
  GG ( d, a, b, c, in[ 2], S22, 4243563512); /* 30 */
219 
  GG ( c, d, a, b, in[ 7], S23, 1735328473); /* 31 */
220 
  GG ( b, c, d, a, in[12], S24, 2368359562); /* 32 */
221 
 
222 
  /* Round 3 */
223 
#define S31 4
224 
#define S32 11
225 
#define S33 16
226 
#define S34 23
227 
  HH ( a, b, c, d, in[ 5], S31, 4294588738); /* 33 */
228 
  HH ( d, a, b, c, in[ 8], S32, 2272392833); /* 34 */
229 
  HH ( c, d, a, b, in[11], S33, 1839030562); /* 35 */
230 
  HH ( b, c, d, a, in[14], S34, 4259657740); /* 36 */
231 
  HH ( a, b, c, d, in[ 1], S31, 2763975236); /* 37 */
232 
  HH ( d, a, b, c, in[ 4], S32, 1272893353); /* 38 */
233 
  HH ( c, d, a, b, in[ 7], S33, 4139469664); /* 39 */
234 
  HH ( b, c, d, a, in[10], S34, 3200236656); /* 40 */
235 
  HH ( a, b, c, d, in[13], S31,  681279174); /* 41 */
236 
  HH ( d, a, b, c, in[ 0], S32, 3936430074); /* 42 */
237 
  HH ( c, d, a, b, in[ 3], S33, 3572445317); /* 43 */
238 
  HH ( b, c, d, a, in[ 6], S34,   76029189); /* 44 */
239 
  HH ( a, b, c, d, in[ 9], S31, 3654602809); /* 45 */
240 
  HH ( d, a, b, c, in[12], S32, 3873151461); /* 46 */
241 
  HH ( c, d, a, b, in[15], S33,  530742520); /* 47 */
242 
  HH ( b, c, d, a, in[ 2], S34, 3299628645); /* 48 */
243 
 
244 
  /* Round 4 */
245 
#define S41 6
246 
#define S42 10
247 
#define S43 15
248 
#define S44 21
249 
  II ( a, b, c, d, in[ 0], S41, 4096336452); /* 49 */
250 
  II ( d, a, b, c, in[ 7], S42, 1126891415); /* 50 */
251 
  II ( c, d, a, b, in[14], S43, 2878612391); /* 51 */
252 
  II ( b, c, d, a, in[ 5], S44, 4237533241); /* 52 */
253 
  II ( a, b, c, d, in[12], S41, 1700485571); /* 53 */
254 
  II ( d, a, b, c, in[ 3], S42, 2399980690); /* 54 */
255 
  II ( c, d, a, b, in[10], S43, 4293915773); /* 55 */
256 
  II ( b, c, d, a, in[ 1], S44, 2240044497); /* 56 */
257 
  II ( a, b, c, d, in[ 8], S41, 1873313359); /* 57 */
258 
  II ( d, a, b, c, in[15], S42, 4264355552); /* 58 */
259 
  II ( c, d, a, b, in[ 6], S43, 2734768916); /* 59 */
260 
  II ( b, c, d, a, in[13], S44, 1309151649); /* 60 */
261 
  II ( a, b, c, d, in[ 4], S41, 4149444226); /* 61 */
262 
  II ( d, a, b, c, in[11], S42, 3174756917); /* 62 */
263 
  II ( c, d, a, b, in[ 2], S43,  718787259); /* 63 */
264 
  II ( b, c, d, a, in[ 9], S44, 3951481745); /* 64 */
265 
 
266 
  buf[0] += a;
267 
  buf[1] += b;
268 
  buf[2] += c;
269 
  buf[3] += d;
270 
}
271 
 
272 
/*
273 
 **********************************************************************
274 
 ** End of md5.c                                                     **
275 
 ******************************* (cut) ********************************
276 
 */