]>
jfr.im git - irc/quakenet/snircd.git/blob - ircd/ircd_md5.c
2 * IRC - Internet Relay Chat, ircd/ircd_md5.h
4 * This code implements the MD5 message-digest algorithm.
5 * The algorithm is due to Ron Rivest. This code was
6 * written by Colin Plumb in 1993, no copyright is claimed.
7 * This code is in the public domain; do with it what you wish.
9 * Equivalent code is available from RSA Data Security, Inc.
10 * This code has been tested against that, and is equivalent,
11 * except that you don't need to include two pages of legalese
14 * To compute the message digest of a chunk of bytes, declare an
15 * MD5Context structure, pass it to MD5Init, call MD5Update as
16 * needed on buffers full of bytes, and then call MD5Final, which
17 * will fill a supplied 16-byte array with the digest.
19 * ircuified 2002 by hikari
22 * @brief MD5 implementation for ircu.
23 * @version $Id: ircd_md5.c,v 1.4 2004/10/05 22:51:47 entrope Exp $
30 /** Bit-reverse bytes in a buffer. */
31 #define byteReverse(buf, len) /* Nothing */
33 static void byteReverse(unsigned char *buf
, unsigned longs
);
37 * Note: this code is harmless on little-endian machines.
39 static void byteReverse(unsigned char *buf
, unsigned longs
)
43 t
= (uint32
) ((unsigned) buf
[3] << 8 | buf
[2]) << 16 |
44 ((unsigned) buf
[1] << 8 | buf
[0]);
52 /** Iniitalize MD5 context.
53 * @param[out] ctx MD5 context to initialize.
55 void MD5Init(struct MD5Context
*ctx
)
57 ctx
->buf
[0] = 0x67452301U
;
58 ctx
->buf
[1] = 0xefcdab89U
;
59 ctx
->buf
[2] = 0x98badcfeU
;
60 ctx
->buf
[3] = 0x10325476U
;
66 /** Update MD5 context with data from a buffer.
67 * @param[in,out] ctx MD5 context to operate on.
68 * @param[in] buf Input buffer.
69 * @param[in] len Number of bytes in input buffer.
71 void MD5Update(struct MD5Context
*ctx
, unsigned const char *buf
, unsigned len
)
78 if ((ctx
->bits
[0] = t
+ ((uint32
) len
<< 3)) < t
)
79 ctx
->bits
[1]++; /* Carry from low to high */
80 ctx
->bits
[1] += len
>> 29;
82 t
= (t
>> 3) & 0x3f; /* Bytes already in shsInfo->data */
84 /* Handle any leading odd-sized chunks */
87 unsigned char *p
= (unsigned char *) ctx
->in
+ t
;
95 byteReverse(ctx
->in
, 16);
96 MD5Transform(ctx
->buf
, (uint32
*) ctx
->in
);
100 /* Process data in 64-byte chunks */
103 memcpy(ctx
->in
, buf
, 64);
104 byteReverse(ctx
->in
, 16);
105 MD5Transform(ctx
->buf
, (uint32
*) ctx
->in
);
110 /* Handle any remaining bytes of data. */
112 memcpy(ctx
->in
, buf
, len
);
115 /** Perform final steps of MD5 hash.
116 * @param[out] digest Receives output hash value.
117 * @param[in,out] ctx MD5 context to finalize.
119 void MD5Final(unsigned char digest
[16], struct MD5Context
*ctx
)
124 /* Compute number of bytes mod 64 */
125 count
= (ctx
->bits
[0] >> 3) & 0x3F;
127 /* Set the first char of padding to 0x80. This is safe since there is
128 always at least one byte free */
132 /* Bytes of padding needed to make 64 bytes */
133 count
= 64 - 1 - count
;
135 /* Pad out to 56 mod 64 */
137 /* Two lots of padding: Pad the first block to 64 bytes */
139 byteReverse(ctx
->in
, 16);
140 MD5Transform(ctx
->buf
, (uint32
*) ctx
->in
);
142 /* Now fill the next block with 56 bytes */
143 memset(ctx
->in
, 0, 56);
145 /* Pad block to 56 bytes */
146 memset(p
, 0, count
- 8);
148 byteReverse(ctx
->in
, 14);
150 /* Append length in bits and transform */
151 ((uint32
*) ctx
->in
)[14] = ctx
->bits
[0];
152 ((uint32
*) ctx
->in
)[15] = ctx
->bits
[1];
154 MD5Transform(ctx
->buf
, (uint32
*) ctx
->in
);
155 byteReverse((unsigned char *) ctx
->buf
, 4);
156 memcpy(digest
, ctx
->buf
, 16);
157 memset(ctx
, 0, sizeof(ctx
)); /* In case it's sensitive */
162 /* The four core functions - F1 is optimized somewhat */
164 /* #define F1(x, y, z) (x & y | ~x & z) */
165 /** Helper function for first round of MD5. */
166 #define F1(x, y, z) (z ^ (x & (y ^ z)))
167 /** Helper function for second round of MD5. */
168 #define F2(x, y, z) F1(z, x, y)
169 /** Helper function for third round of MD5. */
170 #define F3(x, y, z) (x ^ y ^ z)
171 /** Helper function for fourth round of MD5. */
172 #define F4(x, y, z) (y ^ (x | ~z))
174 /** Step function for each round of MD5 */
175 #define MD5STEP(f, w, x, y, z, data, s) \
176 ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
178 /** Perform the core MD5 update steps to update a 128-bit hash value
179 * with 512 bits of input data.
180 * @param[in,out] buf Hash value.
181 * @param[in] in Input buffer.
183 void MD5Transform(uint32 buf
[4], uint32
const in
[16])
185 register uint32 a
, b
, c
, d
;
192 MD5STEP(F1
, a
, b
, c
, d
, in
[0] + 0xd76aa478U
, 7);
193 MD5STEP(F1
, d
, a
, b
, c
, in
[1] + 0xe8c7b756U
, 12);
194 MD5STEP(F1
, c
, d
, a
, b
, in
[2] + 0x242070dbU
, 17);
195 MD5STEP(F1
, b
, c
, d
, a
, in
[3] + 0xc1bdceeeU
, 22);
196 MD5STEP(F1
, a
, b
, c
, d
, in
[4] + 0xf57c0fafU
, 7);
197 MD5STEP(F1
, d
, a
, b
, c
, in
[5] + 0x4787c62aU
, 12);
198 MD5STEP(F1
, c
, d
, a
, b
, in
[6] + 0xa8304613U
, 17);
199 MD5STEP(F1
, b
, c
, d
, a
, in
[7] + 0xfd469501U
, 22);
200 MD5STEP(F1
, a
, b
, c
, d
, in
[8] + 0x698098d8U
, 7);
201 MD5STEP(F1
, d
, a
, b
, c
, in
[9] + 0x8b44f7afU
, 12);
202 MD5STEP(F1
, c
, d
, a
, b
, in
[10] + 0xffff5bb1U
, 17);
203 MD5STEP(F1
, b
, c
, d
, a
, in
[11] + 0x895cd7beU
, 22);
204 MD5STEP(F1
, a
, b
, c
, d
, in
[12] + 0x6b901122U
, 7);
205 MD5STEP(F1
, d
, a
, b
, c
, in
[13] + 0xfd987193U
, 12);
206 MD5STEP(F1
, c
, d
, a
, b
, in
[14] + 0xa679438eU
, 17);
207 MD5STEP(F1
, b
, c
, d
, a
, in
[15] + 0x49b40821U
, 22);
209 MD5STEP(F2
, a
, b
, c
, d
, in
[1] + 0xf61e2562U
, 5);
210 MD5STEP(F2
, d
, a
, b
, c
, in
[6] + 0xc040b340U
, 9);
211 MD5STEP(F2
, c
, d
, a
, b
, in
[11] + 0x265e5a51U
, 14);
212 MD5STEP(F2
, b
, c
, d
, a
, in
[0] + 0xe9b6c7aaU
, 20);
213 MD5STEP(F2
, a
, b
, c
, d
, in
[5] + 0xd62f105dU
, 5);
214 MD5STEP(F2
, d
, a
, b
, c
, in
[10] + 0x02441453U
, 9);
215 MD5STEP(F2
, c
, d
, a
, b
, in
[15] + 0xd8a1e681U
, 14);
216 MD5STEP(F2
, b
, c
, d
, a
, in
[4] + 0xe7d3fbc8U
, 20);
217 MD5STEP(F2
, a
, b
, c
, d
, in
[9] + 0x21e1cde6U
, 5);
218 MD5STEP(F2
, d
, a
, b
, c
, in
[14] + 0xc33707d6U
, 9);
219 MD5STEP(F2
, c
, d
, a
, b
, in
[3] + 0xf4d50d87U
, 14);
220 MD5STEP(F2
, b
, c
, d
, a
, in
[8] + 0x455a14edU
, 20);
221 MD5STEP(F2
, a
, b
, c
, d
, in
[13] + 0xa9e3e905U
, 5);
222 MD5STEP(F2
, d
, a
, b
, c
, in
[2] + 0xfcefa3f8U
, 9);
223 MD5STEP(F2
, c
, d
, a
, b
, in
[7] + 0x676f02d9U
, 14);
224 MD5STEP(F2
, b
, c
, d
, a
, in
[12] + 0x8d2a4c8aU
, 20);
226 MD5STEP(F3
, a
, b
, c
, d
, in
[5] + 0xfffa3942U
, 4);
227 MD5STEP(F3
, d
, a
, b
, c
, in
[8] + 0x8771f681U
, 11);
228 MD5STEP(F3
, c
, d
, a
, b
, in
[11] + 0x6d9d6122U
, 16);
229 MD5STEP(F3
, b
, c
, d
, a
, in
[14] + 0xfde5380cU
, 23);
230 MD5STEP(F3
, a
, b
, c
, d
, in
[1] + 0xa4beea44U
, 4);
231 MD5STEP(F3
, d
, a
, b
, c
, in
[4] + 0x4bdecfa9U
, 11);
232 MD5STEP(F3
, c
, d
, a
, b
, in
[7] + 0xf6bb4b60U
, 16);
233 MD5STEP(F3
, b
, c
, d
, a
, in
[10] + 0xbebfbc70U
, 23);
234 MD5STEP(F3
, a
, b
, c
, d
, in
[13] + 0x289b7ec6U
, 4);
235 MD5STEP(F3
, d
, a
, b
, c
, in
[0] + 0xeaa127faU
, 11);
236 MD5STEP(F3
, c
, d
, a
, b
, in
[3] + 0xd4ef3085U
, 16);
237 MD5STEP(F3
, b
, c
, d
, a
, in
[6] + 0x04881d05U
, 23);
238 MD5STEP(F3
, a
, b
, c
, d
, in
[9] + 0xd9d4d039U
, 4);
239 MD5STEP(F3
, d
, a
, b
, c
, in
[12] + 0xe6db99e5U
, 11);
240 MD5STEP(F3
, c
, d
, a
, b
, in
[15] + 0x1fa27cf8U
, 16);
241 MD5STEP(F3
, b
, c
, d
, a
, in
[2] + 0xc4ac5665U
, 23);
243 MD5STEP(F4
, a
, b
, c
, d
, in
[0] + 0xf4292244U
, 6);
244 MD5STEP(F4
, d
, a
, b
, c
, in
[7] + 0x432aff97U
, 10);
245 MD5STEP(F4
, c
, d
, a
, b
, in
[14] + 0xab9423a7U
, 15);
246 MD5STEP(F4
, b
, c
, d
, a
, in
[5] + 0xfc93a039U
, 21);
247 MD5STEP(F4
, a
, b
, c
, d
, in
[12] + 0x655b59c3U
, 6);
248 MD5STEP(F4
, d
, a
, b
, c
, in
[3] + 0x8f0ccc92U
, 10);
249 MD5STEP(F4
, c
, d
, a
, b
, in
[10] + 0xffeff47dU
, 15);
250 MD5STEP(F4
, b
, c
, d
, a
, in
[1] + 0x85845dd1U
, 21);
251 MD5STEP(F4
, a
, b
, c
, d
, in
[8] + 0x6fa87e4fU
, 6);
252 MD5STEP(F4
, d
, a
, b
, c
, in
[15] + 0xfe2ce6e0U
, 10);
253 MD5STEP(F4
, c
, d
, a
, b
, in
[6] + 0xa3014314U
, 15);
254 MD5STEP(F4
, b
, c
, d
, a
, in
[13] + 0x4e0811a1U
, 21);
255 MD5STEP(F4
, a
, b
, c
, d
, in
[4] + 0xf7537e82U
, 6);
256 MD5STEP(F4
, d
, a
, b
, c
, in
[11] + 0xbd3af235U
, 10);
257 MD5STEP(F4
, c
, d
, a
, b
, in
[2] + 0x2ad7d2bbU
, 15);
258 MD5STEP(F4
, b
, c
, d
, a
, in
[9] + 0xeb86d391U
, 21);