1 /* File ripped from noiz-0.5 */
2 /* Modified by Pekka Riikonen (priikone@poseidon.pspt.fi) */
5 * This code implements the MD5 message-digest algorithm.
6 * The algorithm is due to Ron Rivest. This code was
7 * written by Colin Plumb in 1993, no copyright is claimed.
8 * This code is in the public domain; do with it what you wish.
10 * Equivalent code is available from RSA Data Security, Inc.
11 * This code has been tested against that, and is equivalent,
12 * except that you don't need to include two pages of legalese
15 * To compute the message digest of a chunk of bytes, declare an
16 * MD5Context structure, pass it to MD5Init, call MD5Update as
17 * needed on buffers full of bytes, and then call MD5Final, which
18 * will fill a supplied 16-byte array with the digest.
21 #include "silcincludes.h"
22 #include "md5_internal.h"
26 * SILC Hash API for MD5
29 SILC_HASH_API_INIT(md5)
31 MD5Init((struct MD5Context *)context);
34 SILC_HASH_API_UPDATE(md5)
36 MD5Update((struct MD5Context *)context, data, len);
39 SILC_HASH_API_FINAL(md5)
41 MD5Final(digest, (struct MD5Context *)context);
44 SILC_HASH_API_TRANSFORM(md5)
46 MD5Transform(state, buffer);
49 SILC_HASH_API_CONTEXT_LEN(md5)
51 return sizeof(struct MD5Context);
55 #define byteReverse(buf, len) /* Nothing */
57 void byteReverse(unsigned char *buf, SilcUInt32s);
61 * Note: this code is harmless on little-endian machines.
63 void byteReverse(unsigned char *buf, SilcUInt32s)
67 t = (SilcUInt32)((unsigned)buf[3]<<8 | buf[2]) << 16 |
68 ((unsigned)buf[1]<<8 | buf[0]);
69 *(SilcUInt32 *)buf = t;
77 * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
78 * initialization constants.
81 MD5Init(struct MD5Context *ctx)
83 ctx->buf[0] = 0x67452301;
84 ctx->buf[1] = 0xefcdab89;
85 ctx->buf[2] = 0x98badcfe;
86 ctx->buf[3] = 0x10325476;
93 * Update context to reflect the concatenation of another buffer full
97 MD5Update(struct MD5Context *ctx, unsigned char const *buf, unsigned len)
101 /* Update bitcount */
104 if ((ctx->bits[0] = t + ((SilcUInt32)len << 3)) < t)
105 ctx->bits[1]++; /* Carry from low to high */
106 ctx->bits[1] += len >> 29;
108 t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
110 /* Handle any leading odd-sized chunks */
113 unsigned char *p = (unsigned char *)ctx->in + t;
121 byteReverse(ctx->in, 16);
122 MD5Transform(ctx->buf, ctx->in);
127 /* Process data in 64-byte chunks */
130 memcpy(ctx->in, buf, 64);
131 byteReverse(ctx->in, 16);
132 MD5Transform(ctx->buf, ctx->in);
137 /* Handle any remaining bytes of data. */
139 memcpy(ctx->in, buf, len);
143 * Final wrapup - pad to 64-byte boundary with the bit pattern
144 * 1 0* (64-bit count of bits processed, MSB-first)
147 MD5Final(unsigned char digest[16], struct MD5Context *ctx)
152 /* Compute number of bytes mod 64 */
153 count = (ctx->bits[0] >> 3) & 0x3F;
155 /* Set the first char of padding to 0x80. This is safe since there is
156 always at least one byte free */
160 /* Bytes of padding needed to make 64 bytes */
161 count = 64 - 1 - count;
163 /* Pad out to 56 mod 64 */
165 /* Two lots of padding: Pad the first block to 64 bytes */
167 byteReverse(ctx->in, 16);
168 MD5Transform(ctx->buf, ctx->in);
170 /* Now fill the next block with 56 bytes */
171 memset(ctx->in, 0, 56);
173 /* Pad block to 56 bytes */
174 memset(p, 0, count-8);
176 byteReverse(ctx->in, 14);
178 /* Append length in bits and transform */
179 ((SilcUInt32 *)ctx->in)[ 14 ] = ctx->bits[0];
180 ((SilcUInt32 *)ctx->in)[ 15 ] = ctx->bits[1];
182 MD5Transform(ctx->buf, ctx->in);
183 byteReverse((unsigned char *)ctx->buf, 4);
184 memcpy(digest, ctx->buf, 16);
185 memset(ctx, 0, sizeof(ctx)); /* In case it's sensitive */
190 /* The four core functions - F1 is optimized somewhat */
192 /* #define F1(x, y, z) (x & y | ~x & z) */
193 #define F1(x, y, z) (z ^ (x & (y ^ z)))
194 #define F2(x, y, z) F1(z, x, y)
195 #define F3(x, y, z) (x ^ y ^ z)
196 #define F4(x, y, z) (y ^ (x | ~z))
198 /* This is the central step in the MD5 algorithm. */
199 #define MD5STEP(f, w, x, y, z, data, s) \
200 ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
203 * The core of the MD5 algorithm, this alters an existing MD5 hash to
204 * reflect the addition of 16 longwords of new data. MD5Update blocks
205 * the data and converts bytes into longwords for this routine.
208 MD5Transform(SilcUInt32 buf[4], const unsigned char kbuf[64])
210 register SilcUInt32 a, b, c, d, i;
213 for (i = 0; i < 16; i++)
214 SILC_GET32_MSB(in[i], kbuf + 4 * i);
221 MD5STEP(F1, a, b, c, d, in[ 0]+0xd76aa478, 7);
222 MD5STEP(F1, d, a, b, c, in[ 1]+0xe8c7b756, 12);
223 MD5STEP(F1, c, d, a, b, in[ 2]+0x242070db, 17);
224 MD5STEP(F1, b, c, d, a, in[ 3]+0xc1bdceee, 22);
225 MD5STEP(F1, a, b, c, d, in[ 4]+0xf57c0faf, 7);
226 MD5STEP(F1, d, a, b, c, in[ 5]+0x4787c62a, 12);
227 MD5STEP(F1, c, d, a, b, in[ 6]+0xa8304613, 17);
228 MD5STEP(F1, b, c, d, a, in[ 7]+0xfd469501, 22);
229 MD5STEP(F1, a, b, c, d, in[ 8]+0x698098d8, 7);
230 MD5STEP(F1, d, a, b, c, in[ 9]+0x8b44f7af, 12);
231 MD5STEP(F1, c, d, a, b, in[10]+0xffff5bb1, 17);
232 MD5STEP(F1, b, c, d, a, in[11]+0x895cd7be, 22);
233 MD5STEP(F1, a, b, c, d, in[12]+0x6b901122, 7);
234 MD5STEP(F1, d, a, b, c, in[13]+0xfd987193, 12);
235 MD5STEP(F1, c, d, a, b, in[14]+0xa679438e, 17);
236 MD5STEP(F1, b, c, d, a, in[15]+0x49b40821, 22);
238 MD5STEP(F2, a, b, c, d, in[ 1]+0xf61e2562, 5);
239 MD5STEP(F2, d, a, b, c, in[ 6]+0xc040b340, 9);
240 MD5STEP(F2, c, d, a, b, in[11]+0x265e5a51, 14);
241 MD5STEP(F2, b, c, d, a, in[ 0]+0xe9b6c7aa, 20);
242 MD5STEP(F2, a, b, c, d, in[ 5]+0xd62f105d, 5);
243 MD5STEP(F2, d, a, b, c, in[10]+0x02441453, 9);
244 MD5STEP(F2, c, d, a, b, in[15]+0xd8a1e681, 14);
245 MD5STEP(F2, b, c, d, a, in[ 4]+0xe7d3fbc8, 20);
246 MD5STEP(F2, a, b, c, d, in[ 9]+0x21e1cde6, 5);
247 MD5STEP(F2, d, a, b, c, in[14]+0xc33707d6, 9);
248 MD5STEP(F2, c, d, a, b, in[ 3]+0xf4d50d87, 14);
249 MD5STEP(F2, b, c, d, a, in[ 8]+0x455a14ed, 20);
250 MD5STEP(F2, a, b, c, d, in[13]+0xa9e3e905, 5);
251 MD5STEP(F2, d, a, b, c, in[ 2]+0xfcefa3f8, 9);
252 MD5STEP(F2, c, d, a, b, in[ 7]+0x676f02d9, 14);
253 MD5STEP(F2, b, c, d, a, in[12]+0x8d2a4c8a, 20);
255 MD5STEP(F3, a, b, c, d, in[ 5]+0xfffa3942, 4);
256 MD5STEP(F3, d, a, b, c, in[ 8]+0x8771f681, 11);
257 MD5STEP(F3, c, d, a, b, in[11]+0x6d9d6122, 16);
258 MD5STEP(F3, b, c, d, a, in[14]+0xfde5380c, 23);
259 MD5STEP(F3, a, b, c, d, in[ 1]+0xa4beea44, 4);
260 MD5STEP(F3, d, a, b, c, in[ 4]+0x4bdecfa9, 11);
261 MD5STEP(F3, c, d, a, b, in[ 7]+0xf6bb4b60, 16);
262 MD5STEP(F3, b, c, d, a, in[10]+0xbebfbc70, 23);
263 MD5STEP(F3, a, b, c, d, in[13]+0x289b7ec6, 4);
264 MD5STEP(F3, d, a, b, c, in[ 0]+0xeaa127fa, 11);
265 MD5STEP(F3, c, d, a, b, in[ 3]+0xd4ef3085, 16);
266 MD5STEP(F3, b, c, d, a, in[ 6]+0x04881d05, 23);
267 MD5STEP(F3, a, b, c, d, in[ 9]+0xd9d4d039, 4);
268 MD5STEP(F3, d, a, b, c, in[12]+0xe6db99e5, 11);
269 MD5STEP(F3, c, d, a, b, in[15]+0x1fa27cf8, 16);
270 MD5STEP(F3, b, c, d, a, in[ 2]+0xc4ac5665, 23);
272 MD5STEP(F4, a, b, c, d, in[ 0]+0xf4292244, 6);
273 MD5STEP(F4, d, a, b, c, in[ 7]+0x432aff97, 10);
274 MD5STEP(F4, c, d, a, b, in[14]+0xab9423a7, 15);
275 MD5STEP(F4, b, c, d, a, in[ 5]+0xfc93a039, 21);
276 MD5STEP(F4, a, b, c, d, in[12]+0x655b59c3, 6);
277 MD5STEP(F4, d, a, b, c, in[ 3]+0x8f0ccc92, 10);
278 MD5STEP(F4, c, d, a, b, in[10]+0xffeff47d, 15);
279 MD5STEP(F4, b, c, d, a, in[ 1]+0x85845dd1, 21);
280 MD5STEP(F4, a, b, c, d, in[ 8]+0x6fa87e4f, 6);
281 MD5STEP(F4, d, a, b, c, in[15]+0xfe2ce6e0, 10);
282 MD5STEP(F4, c, d, a, b, in[ 6]+0xa3014314, 15);
283 MD5STEP(F4, b, c, d, a, in[13]+0x4e0811a1, 21);
284 MD5STEP(F4, a, b, c, d, in[ 4]+0xf7537e82, 6);
285 MD5STEP(F4, d, a, b, c, in[11]+0xbd3af235, 10);
286 MD5STEP(F4, c, d, a, b, in[ 2]+0x2ad7d2bb, 15);
287 MD5STEP(F4, b, c, d, a, in[ 9]+0xeb86d391, 21);