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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: md5.c,v 1.3 2000/06/17 11:31:43 mdw Exp $ |
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4 | * |
5 | * The MD5 message digest function |
6 | * |
7 | * (c) 1998 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: md5.c,v $ |
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33 | * Revision 1.3 2000/06/17 11:31:43 mdw |
34 | * Portability fix for broken compilers. |
35 | * |
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36 | * Revision 1.2 1999/12/10 23:20:03 mdw |
37 | * New hash interface requirements. |
38 | * |
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39 | * Revision 1.1 1999/09/03 08:41:12 mdw |
40 | * Initial import. |
41 | * |
42 | */ |
43 | |
44 | /*----- Header files ------------------------------------------------------*/ |
45 | |
46 | #include <mLib/bits.h> |
47 | |
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48 | #include "ghash.h" |
49 | #include "ghash-def.h" |
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50 | #include "hash.h" |
51 | #include "md5.h" |
52 | |
53 | /*----- Main code ---------------------------------------------------------*/ |
54 | |
55 | /* --- @md5_compress@ --- * |
56 | * |
57 | * Arguments: @md5_ctx *ctx@ = pointer to context block |
58 | * @const void *sbuf@ = pointer to buffer of appropriate size |
59 | * |
60 | * Returns: --- |
61 | * |
62 | * Use: MD5 compression function. |
63 | */ |
64 | |
65 | void md5_compress(md5_ctx *ctx, const void *sbuf) |
66 | { |
67 | uint32 a, b, c, d; |
68 | uint32 buf[16]; |
69 | |
70 | /* --- Fetch the chaining variables --- */ |
71 | |
72 | a = ctx->a; |
73 | b = ctx->b; |
74 | c = ctx->c; |
75 | d = ctx->d; |
76 | |
77 | /* --- Fetch the buffer contents --- */ |
78 | |
79 | { |
80 | int i; |
81 | const octet *p; |
82 | |
83 | for (i = 0, p = sbuf; i < 16; i++, p += 4) |
84 | buf[i] = LOAD32_L(p); |
85 | } |
86 | |
87 | /* --- Definitions for round functions --- */ |
88 | |
89 | #define F(x, y, z) (((x) & (y)) | (~(x) & (z))) |
90 | #define G(x, y, z) (((x) & (z)) | ((y) & ~(z))) |
91 | #define H(x, y, z) ((x) ^ (y) ^ (z)) |
92 | #define I(x, y, z) ((y) ^ ((x) | ~(z))) |
93 | |
94 | #define T(w, x, y, z, i, r, k, f) do { \ |
95 | uint32 _t = w + f(x, y, z) + buf[i] + k; \ |
96 | w = ROL32(_t, r) + x; \ |
97 | } while (0) |
98 | |
99 | #define FF(w, x, y, z, i, r, k) T(w, x, y, z, i, r, k, F) |
100 | #define GG(w, x, y, z, i, r, k) T(w, x, y, z, i, r, k, G) |
101 | #define HH(w, x, y, z, i, r, k) T(w, x, y, z, i, r, k, H) |
102 | #define II(w, x, y, z, i, r, k) T(w, x, y, z, i, r, k, I) |
103 | |
104 | /* --- The main compression function --- */ |
105 | |
106 | FF(a, b, c, d, 0, 7, 0xd76aa478); |
107 | FF(d, a, b, c, 1, 12, 0xe8c7b756); |
108 | FF(c, d, a, b, 2, 17, 0x242070db); |
109 | FF(b, c, d, a, 3, 22, 0xc1bdceee); |
110 | FF(a, b, c, d, 4, 7, 0xf57c0faf); |
111 | FF(d, a, b, c, 5, 12, 0x4787c62a); |
112 | FF(c, d, a, b, 6, 17, 0xa8304613); |
113 | FF(b, c, d, a, 7, 22, 0xfd469501); |
114 | FF(a, b, c, d, 8, 7, 0x698098d8); |
115 | FF(d, a, b, c, 9, 12, 0x8b44f7af); |
116 | FF(c, d, a, b, 10, 17, 0xffff5bb1); |
117 | FF(b, c, d, a, 11, 22, 0x895cd7be); |
118 | FF(a, b, c, d, 12, 7, 0x6b901122); |
119 | FF(d, a, b, c, 13, 12, 0xfd987193); |
120 | FF(c, d, a, b, 14, 17, 0xa679438e); |
121 | FF(b, c, d, a, 15, 22, 0x49b40821); |
122 | |
123 | GG(a, b, c, d, 1, 5, 0xf61e2562); |
124 | GG(d, a, b, c, 6, 9, 0xc040b340); |
125 | GG(c, d, a, b, 11, 14, 0x265e5a51); |
126 | GG(b, c, d, a, 0, 20, 0xe9b6c7aa); |
127 | GG(a, b, c, d, 5, 5, 0xd62f105d); |
128 | GG(d, a, b, c, 10, 9, 0x02441453); |
129 | GG(c, d, a, b, 15, 14, 0xd8a1e681); |
130 | GG(b, c, d, a, 4, 20, 0xe7d3fbc8); |
131 | GG(a, b, c, d, 9, 5, 0x21e1cde6); |
132 | GG(d, a, b, c, 14, 9, 0xc33707d6); |
133 | GG(c, d, a, b, 3, 14, 0xf4d50d87); |
134 | GG(b, c, d, a, 8, 20, 0x455a14ed); |
135 | GG(a, b, c, d, 13, 5, 0xa9e3e905); |
136 | GG(d, a, b, c, 2, 9, 0xfcefa3f8); |
137 | GG(c, d, a, b, 7, 14, 0x676f02d9); |
138 | GG(b, c, d, a, 12, 20, 0x8d2a4c8a); |
139 | |
140 | HH(a, b, c, d, 5, 4, 0xfffa3942); |
141 | HH(d, a, b, c, 8, 11, 0x8771f681); |
142 | HH(c, d, a, b, 11, 16, 0x6d9d6122); |
143 | HH(b, c, d, a, 14, 23, 0xfde5380c); |
144 | HH(a, b, c, d, 1, 4, 0xa4beea44); |
145 | HH(d, a, b, c, 4, 11, 0x4bdecfa9); |
146 | HH(c, d, a, b, 7, 16, 0xf6bb4b60); |
147 | HH(b, c, d, a, 10, 23, 0xbebfbc70); |
148 | HH(a, b, c, d, 13, 4, 0x289b7ec6); |
149 | HH(d, a, b, c, 0, 11, 0xeaa127fa); |
150 | HH(c, d, a, b, 3, 16, 0xd4ef3085); |
151 | HH(b, c, d, a, 6, 23, 0x04881d05); |
152 | HH(a, b, c, d, 9, 4, 0xd9d4d039); |
153 | HH(d, a, b, c, 12, 11, 0xe6db99e5); |
154 | HH(c, d, a, b, 15, 16, 0x1fa27cf8); |
155 | HH(b, c, d, a, 2, 23, 0xc4ac5665); |
156 | |
157 | II(a, b, c, d, 0, 6, 0xf4292244); |
158 | II(d, a, b, c, 7, 10, 0x432aff97); |
159 | II(c, d, a, b, 14, 15, 0xab9423a7); |
160 | II(b, c, d, a, 5, 21, 0xfc93a039); |
161 | II(a, b, c, d, 12, 6, 0x655b59c3); |
162 | II(d, a, b, c, 3, 10, 0x8f0ccc92); |
163 | II(c, d, a, b, 10, 15, 0xffeff47d); |
164 | II(b, c, d, a, 1, 21, 0x85845dd1); |
165 | II(a, b, c, d, 8, 6, 0x6fa87e4f); |
166 | II(d, a, b, c, 15, 10, 0xfe2ce6e0); |
167 | II(c, d, a, b, 6, 15, 0xa3014314); |
168 | II(b, c, d, a, 13, 21, 0x4e0811a1); |
169 | II(a, b, c, d, 4, 6, 0xf7537e82); |
170 | II(d, a, b, c, 11, 10, 0xbd3af235); |
171 | II(c, d, a, b, 2, 15, 0x2ad7d2bb); |
172 | II(b, c, d, a, 9, 21, 0xeb86d391); |
173 | |
174 | /* --- Update the chaining variables --- */ |
175 | |
176 | ctx->a += a; |
177 | ctx->b += b; |
178 | ctx->c += c; |
179 | ctx->d += d; |
180 | } |
181 | |
182 | /* --- @md5_init@ --- * |
183 | * |
184 | * Arguments: @md5_ctx *ctx@ = pointer to context block to initialize |
185 | * |
186 | * Returns: --- |
187 | * |
188 | * Use: Initializes a context block ready for hashing. |
189 | */ |
190 | |
191 | void md5_init(md5_ctx *ctx) |
192 | { |
193 | ctx->a = 0x67452301; |
194 | ctx->b = 0xefcdab89; |
195 | ctx->c = 0x98badcfe; |
196 | ctx->d = 0x10325476; |
197 | ctx->off = 0; |
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198 | ctx->nl = ctx->nh = 0; |
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199 | } |
200 | |
201 | /* --- @md5_set@ --- * |
202 | * |
203 | * Arguments: @md5_ctx *ctx@ = pointer to context block |
204 | * @const void *buf@ = pointer to state buffer |
205 | * @unsigned long count@ = current count of bytes processed |
206 | * |
207 | * Returns: --- |
208 | * |
209 | * Use: Initializes a context block from a given state. This is |
210 | * useful in cases where the initial hash state is meant to be |
211 | * secret, e.g., for NMAC and HMAC support. |
212 | */ |
213 | |
214 | void md5_set(md5_ctx *ctx, const void *buf, unsigned long count) |
215 | { |
216 | const octet *p = buf; |
217 | ctx->a = LOAD32_L(p + 0); |
218 | ctx->b = LOAD32_L(p + 4); |
219 | ctx->c = LOAD32_L(p + 8); |
220 | ctx->d = LOAD32_L(p + 12); |
221 | ctx->off = 0; |
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222 | ctx->nl = U32(count); |
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223 | ctx->nh = U32(((count & ~MASK32) >> 16) >> 16); |
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224 | } |
225 | |
226 | /* --- @md5_hash@ --- * |
227 | * |
228 | * Arguments: @md5_ctx *ctx@ = pointer to context block |
229 | * @const void *buf@ = buffer of data to hash |
230 | * @size_t sz@ = size of buffer to hash |
231 | * |
232 | * Returns: --- |
233 | * |
234 | * Use: Hashes a buffer of data. The buffer may be of any size and |
235 | * alignment. |
236 | */ |
237 | |
238 | void md5_hash(md5_ctx *ctx, const void *buf, size_t sz) |
239 | { |
240 | HASH_BUFFER(MD5, md5, ctx, buf, sz); |
241 | } |
242 | |
243 | /* --- @md5_done@ --- * |
244 | * |
245 | * Arguments: @md5_ctx *ctx@ = pointer to context block |
246 | * @void *hash@ = pointer to output buffer |
247 | * |
248 | * Returns: --- |
249 | * |
250 | * Use: Returns the hash of the data read so far. |
251 | */ |
252 | |
253 | void md5_done(md5_ctx *ctx, void *hash) |
254 | { |
255 | octet *p = hash; |
256 | HASH_MD5STRENGTH(MD5, md5, ctx); |
257 | STORE32_L(p + 0, ctx->a); |
258 | STORE32_L(p + 4, ctx->b); |
259 | STORE32_L(p + 8, ctx->c); |
260 | STORE32_L(p + 12, ctx->d); |
261 | } |
262 | |
263 | /* --- @md5_state@ --- * |
264 | * |
265 | * Arguments: @md5_ctx *ctx@ = pointer to context |
266 | * @void *state@ = pointer to buffer for current state |
267 | * |
268 | * Returns: Number of bytes written to the hash function so far. |
269 | * |
270 | * Use: Returns the current state of the hash function such that |
271 | * it can be passed to @md5_set@. |
272 | */ |
273 | |
274 | unsigned long md5_state(md5_ctx *ctx, void *state) |
275 | { |
276 | octet *p = state; |
277 | STORE32_L(p + 0, ctx->a); |
278 | STORE32_L(p + 4, ctx->b); |
279 | STORE32_L(p + 8, ctx->c); |
280 | STORE32_L(p + 12, ctx->d); |
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281 | return (ctx->nl | ((ctx->nh << 16) << 16)); |
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282 | } |
283 | |
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284 | /* --- Generic interface --- */ |
285 | |
286 | GHASH_DEF(MD5, md5) |
287 | |
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288 | /* --- Test code --- */ |
289 | |
290 | HASH_TEST(MD5, md5) |
291 | |
292 | /*----- That's all, folks -------------------------------------------------*/ |