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