2 * $Id: md5.c,v 1.3 2004/04/14 21:06:23 mkern Exp $
3 * This code implements the MD5 message-digest algorithm.
4 * The algorithm is due to Ron Rivest. This code was
5 * written by Colin Plumb in 1993, no copyright is claimed.
6 * This code is in the public domain; do with it what you wish.
8 * Equivalent code is available from RSA Data Security, Inc.
9 * This code has been tested against that, and is equivalent,
10 * except that you don't need to include two pages of legalese
13 * To compute the message digest of a chunk of bytes, declare an
14 * MD5Context structure, pass it to MD5Init, call MD5Update as
15 * needed on buffers full of bytes, and then call MD5Final, which
16 * will fill a supplied 16-byte array with the digest.
22 #include "securityAssistant/IN_SA_MD5.h"
24 static void MD5Transform(unsigned long int buf[4], const unsigned long int in[16]);
25 static void _byte_reverse(unsigned char *buf, unsigned int longs);
27 void MD5GetDigest(const char *buffer, int buffer_size, unsigned char *digest)
32 MD5Update(&ctx, buffer, buffer_size);
33 MD5Final(&ctx, digest);
37 void MD5Init(MD5Context *ctx)
39 ctx->buf[0] = 0x67452301;
40 ctx->buf[1] = 0xefcdab89;
41 ctx->buf[2] = 0x98badcfe;
42 ctx->buf[3] = 0x10325476;
48 ctx->doByteReverse = 1;
50 ctx->doByteReverse = 0;
53 void MD5Update(MD5Context *ctx, const char *buf, unsigned long int len)
60 if ((ctx->bits[0] = t + ((unsigned int)len << 3)) < t)
61 ctx->bits[1]++; /* Carry from low to high */
62 ctx->bits[1] += len >> 29;
64 t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
66 /* Handle any leading odd-sized chunks */
69 unsigned char *p = (unsigned char *)ctx->in + t;
77 if (ctx->doByteReverse)
78 _byte_reverse(ctx->in, 16);
79 MD5Transform(ctx->buf, (const long unsigned int *)ctx->in);
83 /* Process data in 64-byte chunks */
86 memcpy(ctx->in, buf, 64);
87 if (ctx->doByteReverse)
88 _byte_reverse(ctx->in, 16);
89 MD5Transform(ctx->buf, (const long unsigned int *)ctx->in);
94 /* Handle any remaining bytes of data. */
96 memcpy(ctx->in, buf, len);
99 static void MD5Transform(unsigned long int buf[4], const unsigned long int in[16])
101 register unsigned int a, b, c, d;
108 MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
109 MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
110 MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
111 MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
112 MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
113 MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
114 MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
115 MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
116 MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
117 MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
118 MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
119 MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
120 MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
121 MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
122 MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
123 MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
125 MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
126 MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
127 MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
128 MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
129 MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
130 MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
131 MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
132 MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
133 MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
134 MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
135 MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
136 MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
137 MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
138 MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
139 MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
140 MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
142 MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
143 MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
144 MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
145 MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
146 MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
147 MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
148 MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
149 MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
150 MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
151 MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
152 MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
153 MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
154 MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
155 MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
156 MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
157 MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
159 MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
160 MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
161 MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
162 MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
163 MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
164 MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
165 MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
166 MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
167 MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
168 MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
169 MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
170 MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
171 MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
172 MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
173 MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
174 MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
182 static void _byte_reverse(unsigned char *buf, unsigned int longs)
186 t = (unsigned int)((unsigned int)buf[3] << 8 | buf[2]) << 16 | ((unsigned int)buf[1] << 8 | buf[0]);
187 *(unsigned int *)buf = t;
192 void MD5Final(MD5Context *ctx, unsigned char *digest)
197 /* Compute number of bytes mod 64 */
198 count = (ctx->bits[0] >> 3) & 0x3F;
200 /* Set the first char of padding to 0x80. This is safe since there is
201 always at least one byte free */
205 /* Bytes of padding needed to make 64 bytes */
206 count = 64 - 1 - count;
208 /* Pad out to 56 mod 64 */
210 /* Two lots of padding: Pad the first block to 64 bytes */
212 if (ctx->doByteReverse)
213 _byte_reverse(ctx->in, 16);
214 MD5Transform(ctx->buf, (const long unsigned int *)ctx->in);
216 /* Now fill the next block with 56 bytes */
217 memset(ctx->in, 0, 56);
219 /* Pad block to 56 bytes */
220 memset(p, 0, count - 8);
222 if (ctx->doByteReverse)
223 _byte_reverse(ctx->in, 14);
225 /* Append length in bits and transform */
226 ((unsigned int *)ctx->in)[14] = ctx->bits[0];
227 ((unsigned int *)ctx->in)[15] = ctx->bits[1];
229 MD5Transform(ctx->buf, (const long unsigned int *)ctx->in);
230 if (ctx->doByteReverse)
231 _byte_reverse((unsigned char *)ctx->buf, 4);
232 memcpy(digest, ctx->buf, 16);