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d03ab969 | 1 | /* -*-c-*- |
d03ab969 | 2 | * |
3 | * The MD5 message digest function | |
4 | * | |
5 | * (c) 1998 Straylight/Edgeware | |
6 | */ | |
7 | ||
45c0fd36 | 8 | /*----- Licensing notice --------------------------------------------------* |
d03ab969 | 9 | * |
10 | * This file is part of Catacomb. | |
11 | * | |
12 | * Catacomb is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU Library General Public License as | |
14 | * published by the Free Software Foundation; either version 2 of the | |
15 | * License, or (at your option) any later version. | |
45c0fd36 | 16 | * |
d03ab969 | 17 | * Catacomb is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU Library General Public License for more details. | |
45c0fd36 | 21 | * |
d03ab969 | 22 | * You should have received a copy of the GNU Library General Public |
23 | * License along with Catacomb; if not, write to the Free | |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
25 | * MA 02111-1307, USA. | |
26 | */ | |
27 | ||
d03ab969 | 28 | /*----- Header files ------------------------------------------------------*/ |
29 | ||
30 | #include <mLib/bits.h> | |
31 | ||
dc2f0497 | 32 | #include "ghash.h" |
33 | #include "ghash-def.h" | |
d03ab969 | 34 | #include "hash.h" |
35 | #include "md5.h" | |
36 | ||
37 | /*----- Main code ---------------------------------------------------------*/ | |
38 | ||
39 | /* --- @md5_compress@ --- * | |
40 | * | |
41 | * Arguments: @md5_ctx *ctx@ = pointer to context block | |
42 | * @const void *sbuf@ = pointer to buffer of appropriate size | |
43 | * | |
44 | * Returns: --- | |
45 | * | |
46 | * Use: MD5 compression function. | |
47 | */ | |
48 | ||
49 | void md5_compress(md5_ctx *ctx, const void *sbuf) | |
50 | { | |
51 | uint32 a, b, c, d; | |
52 | uint32 buf[16]; | |
53 | ||
54 | /* --- Fetch the chaining variables --- */ | |
55 | ||
56 | a = ctx->a; | |
57 | b = ctx->b; | |
58 | c = ctx->c; | |
59 | d = ctx->d; | |
60 | ||
61 | /* --- Fetch the buffer contents --- */ | |
62 | ||
63 | { | |
64 | int i; | |
65 | const octet *p; | |
66 | ||
67 | for (i = 0, p = sbuf; i < 16; i++, p += 4) | |
68 | buf[i] = LOAD32_L(p); | |
69 | } | |
70 | ||
71 | /* --- Definitions for round functions --- */ | |
72 | ||
73 | #define F(x, y, z) (((x) & (y)) | (~(x) & (z))) | |
74 | #define G(x, y, z) (((x) & (z)) | ((y) & ~(z))) | |
75 | #define H(x, y, z) ((x) ^ (y) ^ (z)) | |
76 | #define I(x, y, z) ((y) ^ ((x) | ~(z))) | |
77 | ||
78 | #define T(w, x, y, z, i, r, k, f) do { \ | |
79 | uint32 _t = w + f(x, y, z) + buf[i] + k; \ | |
80 | w = ROL32(_t, r) + x; \ | |
81 | } while (0) | |
82 | ||
83 | #define FF(w, x, y, z, i, r, k) T(w, x, y, z, i, r, k, F) | |
84 | #define GG(w, x, y, z, i, r, k) T(w, x, y, z, i, r, k, G) | |
85 | #define HH(w, x, y, z, i, r, k) T(w, x, y, z, i, r, k, H) | |
86 | #define II(w, x, y, z, i, r, k) T(w, x, y, z, i, r, k, I) | |
87 | ||
88 | /* --- The main compression function --- */ | |
89 | ||
90 | FF(a, b, c, d, 0, 7, 0xd76aa478); | |
91 | FF(d, a, b, c, 1, 12, 0xe8c7b756); | |
92 | FF(c, d, a, b, 2, 17, 0x242070db); | |
93 | FF(b, c, d, a, 3, 22, 0xc1bdceee); | |
94 | FF(a, b, c, d, 4, 7, 0xf57c0faf); | |
95 | FF(d, a, b, c, 5, 12, 0x4787c62a); | |
96 | FF(c, d, a, b, 6, 17, 0xa8304613); | |
97 | FF(b, c, d, a, 7, 22, 0xfd469501); | |
98 | FF(a, b, c, d, 8, 7, 0x698098d8); | |
99 | FF(d, a, b, c, 9, 12, 0x8b44f7af); | |
100 | FF(c, d, a, b, 10, 17, 0xffff5bb1); | |
101 | FF(b, c, d, a, 11, 22, 0x895cd7be); | |
102 | FF(a, b, c, d, 12, 7, 0x6b901122); | |
103 | FF(d, a, b, c, 13, 12, 0xfd987193); | |
104 | FF(c, d, a, b, 14, 17, 0xa679438e); | |
105 | FF(b, c, d, a, 15, 22, 0x49b40821); | |
106 | ||
107 | GG(a, b, c, d, 1, 5, 0xf61e2562); | |
108 | GG(d, a, b, c, 6, 9, 0xc040b340); | |
109 | GG(c, d, a, b, 11, 14, 0x265e5a51); | |
110 | GG(b, c, d, a, 0, 20, 0xe9b6c7aa); | |
111 | GG(a, b, c, d, 5, 5, 0xd62f105d); | |
112 | GG(d, a, b, c, 10, 9, 0x02441453); | |
113 | GG(c, d, a, b, 15, 14, 0xd8a1e681); | |
114 | GG(b, c, d, a, 4, 20, 0xe7d3fbc8); | |
115 | GG(a, b, c, d, 9, 5, 0x21e1cde6); | |
116 | GG(d, a, b, c, 14, 9, 0xc33707d6); | |
117 | GG(c, d, a, b, 3, 14, 0xf4d50d87); | |
118 | GG(b, c, d, a, 8, 20, 0x455a14ed); | |
119 | GG(a, b, c, d, 13, 5, 0xa9e3e905); | |
120 | GG(d, a, b, c, 2, 9, 0xfcefa3f8); | |
121 | GG(c, d, a, b, 7, 14, 0x676f02d9); | |
122 | GG(b, c, d, a, 12, 20, 0x8d2a4c8a); | |
123 | ||
124 | HH(a, b, c, d, 5, 4, 0xfffa3942); | |
125 | HH(d, a, b, c, 8, 11, 0x8771f681); | |
126 | HH(c, d, a, b, 11, 16, 0x6d9d6122); | |
127 | HH(b, c, d, a, 14, 23, 0xfde5380c); | |
128 | HH(a, b, c, d, 1, 4, 0xa4beea44); | |
129 | HH(d, a, b, c, 4, 11, 0x4bdecfa9); | |
130 | HH(c, d, a, b, 7, 16, 0xf6bb4b60); | |
131 | HH(b, c, d, a, 10, 23, 0xbebfbc70); | |
132 | HH(a, b, c, d, 13, 4, 0x289b7ec6); | |
133 | HH(d, a, b, c, 0, 11, 0xeaa127fa); | |
134 | HH(c, d, a, b, 3, 16, 0xd4ef3085); | |
135 | HH(b, c, d, a, 6, 23, 0x04881d05); | |
136 | HH(a, b, c, d, 9, 4, 0xd9d4d039); | |
137 | HH(d, a, b, c, 12, 11, 0xe6db99e5); | |
138 | HH(c, d, a, b, 15, 16, 0x1fa27cf8); | |
139 | HH(b, c, d, a, 2, 23, 0xc4ac5665); | |
140 | ||
141 | II(a, b, c, d, 0, 6, 0xf4292244); | |
142 | II(d, a, b, c, 7, 10, 0x432aff97); | |
143 | II(c, d, a, b, 14, 15, 0xab9423a7); | |
144 | II(b, c, d, a, 5, 21, 0xfc93a039); | |
145 | II(a, b, c, d, 12, 6, 0x655b59c3); | |
146 | II(d, a, b, c, 3, 10, 0x8f0ccc92); | |
147 | II(c, d, a, b, 10, 15, 0xffeff47d); | |
148 | II(b, c, d, a, 1, 21, 0x85845dd1); | |
149 | II(a, b, c, d, 8, 6, 0x6fa87e4f); | |
150 | II(d, a, b, c, 15, 10, 0xfe2ce6e0); | |
151 | II(c, d, a, b, 6, 15, 0xa3014314); | |
152 | II(b, c, d, a, 13, 21, 0x4e0811a1); | |
153 | II(a, b, c, d, 4, 6, 0xf7537e82); | |
154 | II(d, a, b, c, 11, 10, 0xbd3af235); | |
155 | II(c, d, a, b, 2, 15, 0x2ad7d2bb); | |
156 | II(b, c, d, a, 9, 21, 0xeb86d391); | |
157 | ||
158 | /* --- Update the chaining variables --- */ | |
159 | ||
160 | ctx->a += a; | |
161 | ctx->b += b; | |
162 | ctx->c += c; | |
163 | ctx->d += d; | |
164 | } | |
165 | ||
166 | /* --- @md5_init@ --- * | |
167 | * | |
168 | * Arguments: @md5_ctx *ctx@ = pointer to context block to initialize | |
169 | * | |
170 | * Returns: --- | |
171 | * | |
172 | * Use: Initializes a context block ready for hashing. | |
173 | */ | |
174 | ||
175 | void md5_init(md5_ctx *ctx) | |
176 | { | |
177 | ctx->a = 0x67452301; | |
178 | ctx->b = 0xefcdab89; | |
179 | ctx->c = 0x98badcfe; | |
180 | ctx->d = 0x10325476; | |
181 | ctx->off = 0; | |
dc2f0497 | 182 | ctx->nl = ctx->nh = 0; |
d03ab969 | 183 | } |
184 | ||
185 | /* --- @md5_set@ --- * | |
186 | * | |
187 | * Arguments: @md5_ctx *ctx@ = pointer to context block | |
188 | * @const void *buf@ = pointer to state buffer | |
189 | * @unsigned long count@ = current count of bytes processed | |
190 | * | |
191 | * Returns: --- | |
192 | * | |
193 | * Use: Initializes a context block from a given state. This is | |
194 | * useful in cases where the initial hash state is meant to be | |
195 | * secret, e.g., for NMAC and HMAC support. | |
196 | */ | |
197 | ||
198 | void md5_set(md5_ctx *ctx, const void *buf, unsigned long count) | |
199 | { | |
200 | const octet *p = buf; | |
45c0fd36 MW |
201 | ctx->a = LOAD32_L(p + 0); |
202 | ctx->b = LOAD32_L(p + 4); | |
203 | ctx->c = LOAD32_L(p + 8); | |
d03ab969 | 204 | ctx->d = LOAD32_L(p + 12); |
205 | ctx->off = 0; | |
dc2f0497 | 206 | ctx->nl = U32(count); |
5d59cd77 | 207 | ctx->nh = U32(((count & ~MASK32) >> 16) >> 16); |
d03ab969 | 208 | } |
209 | ||
210 | /* --- @md5_hash@ --- * | |
211 | * | |
212 | * Arguments: @md5_ctx *ctx@ = pointer to context block | |
213 | * @const void *buf@ = buffer of data to hash | |
214 | * @size_t sz@ = size of buffer to hash | |
215 | * | |
216 | * Returns: --- | |
217 | * | |
218 | * Use: Hashes a buffer of data. The buffer may be of any size and | |
219 | * alignment. | |
220 | */ | |
221 | ||
222 | void md5_hash(md5_ctx *ctx, const void *buf, size_t sz) | |
223 | { | |
224 | HASH_BUFFER(MD5, md5, ctx, buf, sz); | |
225 | } | |
226 | ||
227 | /* --- @md5_done@ --- * | |
228 | * | |
229 | * Arguments: @md5_ctx *ctx@ = pointer to context block | |
230 | * @void *hash@ = pointer to output buffer | |
231 | * | |
232 | * Returns: --- | |
233 | * | |
234 | * Use: Returns the hash of the data read so far. | |
235 | */ | |
236 | ||
237 | void md5_done(md5_ctx *ctx, void *hash) | |
238 | { | |
239 | octet *p = hash; | |
240 | HASH_MD5STRENGTH(MD5, md5, ctx); | |
45c0fd36 MW |
241 | STORE32_L(p + 0, ctx->a); |
242 | STORE32_L(p + 4, ctx->b); | |
243 | STORE32_L(p + 8, ctx->c); | |
d03ab969 | 244 | STORE32_L(p + 12, ctx->d); |
245 | } | |
246 | ||
247 | /* --- @md5_state@ --- * | |
248 | * | |
249 | * Arguments: @md5_ctx *ctx@ = pointer to context | |
250 | * @void *state@ = pointer to buffer for current state | |
251 | * | |
252 | * Returns: Number of bytes written to the hash function so far. | |
253 | * | |
254 | * Use: Returns the current state of the hash function such that | |
255 | * it can be passed to @md5_set@. | |
256 | */ | |
257 | ||
258 | unsigned long md5_state(md5_ctx *ctx, void *state) | |
259 | { | |
260 | octet *p = state; | |
45c0fd36 MW |
261 | STORE32_L(p + 0, ctx->a); |
262 | STORE32_L(p + 4, ctx->b); | |
263 | STORE32_L(p + 8, ctx->c); | |
d03ab969 | 264 | STORE32_L(p + 12, ctx->d); |
dc2f0497 | 265 | return (ctx->nl | ((ctx->nh << 16) << 16)); |
d03ab969 | 266 | } |
267 | ||
dc2f0497 | 268 | /* --- Generic interface --- */ |
269 | ||
270 | GHASH_DEF(MD5, md5) | |
271 | ||
d03ab969 | 272 | /* --- Test code --- */ |
273 | ||
274 | HASH_TEST(MD5, md5) | |
275 | ||
276 | /*----- That's all, folks -------------------------------------------------*/ |