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1 | /* | |
2 | * IRC - Internet Relay Chat, ircd/ircd_md5.h | |
3 | * | |
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. | |
8 | * | |
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 | |
12 | * with every copy. | |
13 | * | |
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. | |
18 | * | |
19 | * ircuified 2002 by hikari | |
20 | */ | |
21 | /** @file | |
22 | * @brief MD5 implementation for ircu. | |
23 | * @version $Id: ircd_md5.c,v 1.4 2004/10/05 22:51:47 entrope Exp $ | |
24 | */ | |
25 | ||
26 | #include <string.h> | |
27 | #include "ircd_md5.h" | |
28 | ||
29 | #ifndef HIGHFIRST | |
30 | /** Bit-reverse bytes in a buffer. */ | |
31 | #define byteReverse(buf, len) /* Nothing */ | |
32 | #else | |
33 | static void byteReverse(unsigned char *buf, unsigned longs); | |
34 | ||
35 | #ifndef ASM_MD5 | |
36 | /* | |
37 | * Note: this code is harmless on little-endian machines. | |
38 | */ | |
39 | static void byteReverse(unsigned char *buf, unsigned longs) | |
40 | { | |
41 | uint32 t; | |
42 | do { | |
43 | t = (uint32) ((unsigned) buf[3] << 8 | buf[2]) << 16 | | |
44 | ((unsigned) buf[1] << 8 | buf[0]); | |
45 | *(uint32 *) buf = t; | |
46 | buf += 4; | |
47 | } while (--longs); | |
48 | } | |
49 | #endif | |
50 | #endif | |
51 | ||
52 | /** Iniitalize MD5 context. | |
53 | * @param[out] ctx MD5 context to initialize. | |
54 | */ | |
55 | void MD5Init(struct MD5Context *ctx) | |
56 | { | |
57 | ctx->buf[0] = 0x67452301U; | |
58 | ctx->buf[1] = 0xefcdab89U; | |
59 | ctx->buf[2] = 0x98badcfeU; | |
60 | ctx->buf[3] = 0x10325476U; | |
61 | ||
62 | ctx->bits[0] = 0; | |
63 | ctx->bits[1] = 0; | |
64 | } | |
65 | ||
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. | |
70 | */ | |
71 | void MD5Update(struct MD5Context *ctx, unsigned const char *buf, unsigned len) | |
72 | { | |
73 | uint32 t; | |
74 | ||
75 | /* Update bitcount */ | |
76 | ||
77 | t = ctx->bits[0]; | |
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; | |
81 | ||
82 | t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */ | |
83 | ||
84 | /* Handle any leading odd-sized chunks */ | |
85 | ||
86 | if (t) { | |
87 | unsigned char *p = (unsigned char *) ctx->in + t; | |
88 | ||
89 | t = 64 - t; | |
90 | if (len < t) { | |
91 | memcpy(p, buf, len); | |
92 | return; | |
93 | } | |
94 | memcpy(p, buf, t); | |
95 | byteReverse(ctx->in, 16); | |
96 | MD5Transform(ctx->buf, (uint32 *) ctx->in); | |
97 | buf += t; | |
98 | len -= t; | |
99 | } | |
100 | /* Process data in 64-byte chunks */ | |
101 | ||
102 | while (len >= 64) { | |
103 | memcpy(ctx->in, buf, 64); | |
104 | byteReverse(ctx->in, 16); | |
105 | MD5Transform(ctx->buf, (uint32 *) ctx->in); | |
106 | buf += 64; | |
107 | len -= 64; | |
108 | } | |
109 | ||
110 | /* Handle any remaining bytes of data. */ | |
111 | ||
112 | memcpy(ctx->in, buf, len); | |
113 | } | |
114 | ||
115 | /** Perform final steps of MD5 hash. | |
116 | * @param[out] digest Receives output hash value. | |
117 | * @param[in,out] ctx MD5 context to finalize. | |
118 | */ | |
119 | void MD5Final(unsigned char digest[16], struct MD5Context *ctx) | |
120 | { | |
121 | unsigned count; | |
122 | unsigned char *p; | |
123 | ||
124 | /* Compute number of bytes mod 64 */ | |
125 | count = (ctx->bits[0] >> 3) & 0x3F; | |
126 | ||
127 | /* Set the first char of padding to 0x80. This is safe since there is | |
128 | always at least one byte free */ | |
129 | p = ctx->in + count; | |
130 | *p++ = 0x80; | |
131 | ||
132 | /* Bytes of padding needed to make 64 bytes */ | |
133 | count = 64 - 1 - count; | |
134 | ||
135 | /* Pad out to 56 mod 64 */ | |
136 | if (count < 8) { | |
137 | /* Two lots of padding: Pad the first block to 64 bytes */ | |
138 | memset(p, 0, count); | |
139 | byteReverse(ctx->in, 16); | |
140 | MD5Transform(ctx->buf, (uint32 *) ctx->in); | |
141 | ||
142 | /* Now fill the next block with 56 bytes */ | |
143 | memset(ctx->in, 0, 56); | |
144 | } else { | |
145 | /* Pad block to 56 bytes */ | |
146 | memset(p, 0, count - 8); | |
147 | } | |
148 | byteReverse(ctx->in, 14); | |
149 | ||
150 | /* Append length in bits and transform */ | |
151 | ((uint32 *) ctx->in)[14] = ctx->bits[0]; | |
152 | ((uint32 *) ctx->in)[15] = ctx->bits[1]; | |
153 | ||
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 */ | |
158 | } | |
159 | ||
160 | #ifndef ASM_MD5 | |
161 | ||
162 | /* The four core functions - F1 is optimized somewhat */ | |
163 | ||
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)) | |
173 | ||
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 ) | |
177 | ||
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. | |
182 | */ | |
183 | void MD5Transform(uint32 buf[4], uint32 const in[16]) | |
184 | { | |
185 | register uint32 a, b, c, d; | |
186 | ||
187 | a = buf[0]; | |
188 | b = buf[1]; | |
189 | c = buf[2]; | |
190 | d = buf[3]; | |
191 | ||
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); | |
208 | ||
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); | |
225 | ||
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); | |
242 | ||
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); | |
259 | ||
260 | buf[0] += a; | |
261 | buf[1] += b; | |
262 | buf[2] += c; | |
263 | buf[3] += d; | |
264 | } | |
265 | ||
266 | #endif |