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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: md4.c,v 1.4 2004/04/08 01:36:15 mdw Exp $ |
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4 | * |
5 | * The MD4 message digest function |
6 | * |
7 | * (c) 1999 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 | |
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30 | /*----- Header files ------------------------------------------------------*/ |
31 | |
32 | #include <mLib/bits.h> |
33 | |
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34 | #include "ghash.h" |
35 | #include "ghash-def.h" |
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36 | #include "hash.h" |
37 | #include "md4.h" |
38 | |
39 | /*----- Main code ---------------------------------------------------------*/ |
40 | |
41 | /* --- @md4_compress@ --- * |
42 | * |
43 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
44 | * @const void *sbuf@ = pointer to buffer of appropriate size |
45 | * |
46 | * Returns: --- |
47 | * |
48 | * Use: RIPEMD-160 compression function. |
49 | */ |
50 | |
51 | void md4_compress(md4_ctx *ctx, const void *sbuf) |
52 | { |
53 | uint32 a, b, c, d; |
54 | uint32 buf[16]; |
55 | |
56 | /* --- Fetch the chaining variables --- */ |
57 | |
58 | a = ctx->a; |
59 | b = ctx->b; |
60 | c = ctx->c; |
61 | d = ctx->d; |
62 | |
63 | /* --- Fetch the buffer contents --- */ |
64 | |
65 | { |
66 | int i; |
67 | const octet *p; |
68 | |
69 | for (i = 0, p = sbuf; i < 16; i++, p += 4) |
70 | buf[i] = LOAD32_L(p); |
71 | } |
72 | |
73 | /* --- Definitions for round functions --- */ |
74 | |
75 | #define F(x, y, z) (((x) & (y)) | (~(x) & (z))) |
76 | #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z))) |
77 | #define H(x, y, z) ((x) ^ (y) ^ (z)) |
78 | |
79 | #define T(w, x, y, z, i, r, k, f) do { \ |
80 | uint32 _t = w + f(x, y, z) + buf[i] + k; \ |
81 | w = ROL32(_t, r); \ |
82 | } while (0) |
83 | |
84 | #define FF(w, x, y, z, i, r) T(w, x, y, z, i, r, 0x00000000, F) |
85 | #define GG(w, x, y, z, i, r) T(w, x, y, z, i, r, 0x5a827999, G) |
86 | #define HH(w, x, y, z, i, r) T(w, x, y, z, i, r, 0x6ed9eba1, H) |
87 | |
88 | /* --- The main compression function --- */ |
89 | |
90 | FF(a, b, c, d, 0, 3); |
91 | FF(d, a, b, c, 1, 7); |
92 | FF(c, d, a, b, 2, 11); |
93 | FF(b, c, d, a, 3, 19); |
94 | FF(a, b, c, d, 4, 3); |
95 | FF(d, a, b, c, 5, 7); |
96 | FF(c, d, a, b, 6, 11); |
97 | FF(b, c, d, a, 7, 19); |
98 | FF(a, b, c, d, 8, 3); |
99 | FF(d, a, b, c, 9, 7); |
100 | FF(c, d, a, b, 10, 11); |
101 | FF(b, c, d, a, 11, 19); |
102 | FF(a, b, c, d, 12, 3); |
103 | FF(d, a, b, c, 13, 7); |
104 | FF(c, d, a, b, 14, 11); |
105 | FF(b, c, d, a, 15, 19); |
106 | |
107 | GG(a, b, c, d, 0, 3); |
108 | GG(d, a, b, c, 4, 5); |
109 | GG(c, d, a, b, 8, 9); |
110 | GG(b, c, d, a, 12, 13); |
111 | GG(a, b, c, d, 1, 3); |
112 | GG(d, a, b, c, 5, 5); |
113 | GG(c, d, a, b, 9, 9); |
114 | GG(b, c, d, a, 13, 13); |
115 | GG(a, b, c, d, 2, 3); |
116 | GG(d, a, b, c, 6, 5); |
117 | GG(c, d, a, b, 10, 9); |
118 | GG(b, c, d, a, 14, 13); |
119 | GG(a, b, c, d, 3, 3); |
120 | GG(d, a, b, c, 7, 5); |
121 | GG(c, d, a, b, 11, 9); |
122 | GG(b, c, d, a, 15, 13); |
123 | |
124 | HH(a, b, c, d, 0, 3); |
125 | HH(d, a, b, c, 8, 9); |
126 | HH(c, d, a, b, 4, 11); |
127 | HH(b, c, d, a, 12, 15); |
128 | HH(a, b, c, d, 2, 3); |
129 | HH(d, a, b, c, 10, 9); |
130 | HH(c, d, a, b, 6, 11); |
131 | HH(b, c, d, a, 14, 15); |
132 | HH(a, b, c, d, 1, 3); |
133 | HH(d, a, b, c, 9, 9); |
134 | HH(c, d, a, b, 5, 11); |
135 | HH(b, c, d, a, 13, 15); |
136 | HH(a, b, c, d, 3, 3); |
137 | HH(d, a, b, c, 11, 9); |
138 | HH(c, d, a, b, 7, 11); |
139 | HH(b, c, d, a, 15, 15); |
140 | |
141 | /* --- Update the chaining variables --- */ |
142 | |
143 | ctx->a += a; |
144 | ctx->b += b; |
145 | ctx->c += c; |
146 | ctx->d += d; |
147 | } |
148 | |
149 | /* --- @md4_init@ --- * |
150 | * |
151 | * Arguments: @md4_ctx *ctx@ = pointer to context block to initialize |
152 | * |
153 | * Returns: --- |
154 | * |
155 | * Use: Initializes a context block ready for hashing. |
156 | */ |
157 | |
158 | void md4_init(md4_ctx *ctx) |
159 | { |
160 | ctx->a = 0x67452301; |
161 | ctx->b = 0xefcdab89; |
162 | ctx->c = 0x98badcfe; |
163 | ctx->d = 0x10325476; |
164 | ctx->off = 0; |
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165 | ctx->nl = ctx->nh = 0; |
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166 | } |
167 | |
168 | /* --- @md4_set@ --- * |
169 | * |
170 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
171 | * @const void *buf@ = pointer to state buffer |
172 | * @unsigned long count@ = current count of bytes processed |
173 | * |
174 | * Returns: --- |
175 | * |
176 | * Use: Initializes a context block from a given state. This is |
177 | * useful in cases where the initial hash state is meant to be |
178 | * secret, e.g., for NMAC and HMAC support. |
179 | */ |
180 | |
181 | void md4_set(md4_ctx *ctx, const void *buf, unsigned long count) |
182 | { |
183 | const octet *p = buf; |
184 | ctx->a = LOAD32_L(p + 0); |
185 | ctx->b = LOAD32_L(p + 4); |
186 | ctx->c = LOAD32_L(p + 8); |
187 | ctx->d = LOAD32_L(p + 12); |
188 | ctx->off = 0; |
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189 | ctx->nl = U32(count); |
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190 | ctx->nh = U32(((count & ~MASK32) >> 16) >> 16); |
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191 | } |
192 | |
193 | /* --- @md4_hash@ --- * |
194 | * |
195 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
196 | * @const void *buf@ = buffer of data to hash |
197 | * @size_t sz@ = size of buffer to hash |
198 | * |
199 | * Returns: --- |
200 | * |
201 | * Use: Hashes a buffer of data. The buffer may be of any size and |
202 | * alignment. |
203 | */ |
204 | |
205 | void md4_hash(md4_ctx *ctx, const void *buf, size_t sz) |
206 | { |
207 | HASH_BUFFER(MD4, md4, ctx, buf, sz); |
208 | } |
209 | |
210 | /* --- @md4_done@ --- * |
211 | * |
212 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
213 | * @void *hash@ = pointer to output buffer |
214 | * |
215 | * Returns: --- |
216 | * |
217 | * Use: Returns the hash of the data read so far. |
218 | */ |
219 | |
220 | void md4_done(md4_ctx *ctx, void *hash) |
221 | { |
222 | octet *p = hash; |
223 | HASH_MD5STRENGTH(MD4, md4, ctx); |
224 | STORE32_L(p + 0, ctx->a); |
225 | STORE32_L(p + 4, ctx->b); |
226 | STORE32_L(p + 8, ctx->c); |
227 | STORE32_L(p + 12, ctx->d); |
228 | } |
229 | |
230 | /* --- @md4_state@ --- * |
231 | * |
232 | * Arguments: @md4_ctx *ctx@ = pointer to context |
233 | * @void *state@ = pointer to buffer for current state |
234 | * |
235 | * Returns: Number of bytes written to the hash function so far. |
236 | * |
237 | * Use: Returns the current state of the hash function such that |
238 | * it can be passed to @md4_set@. |
239 | */ |
240 | |
241 | unsigned long md4_state(md4_ctx *ctx, void *state) |
242 | { |
243 | octet *p = state; |
244 | STORE32_L(p + 0, ctx->a); |
245 | STORE32_L(p + 4, ctx->b); |
246 | STORE32_L(p + 8, ctx->c); |
247 | STORE32_L(p + 12, ctx->d); |
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248 | return (ctx->nl | ((ctx->nh >> 16) >> 16)); |
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249 | } |
250 | |
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251 | /* --- Generic interface --- */ |
252 | |
253 | GHASH_DEF(MD4, md4) |
254 | |
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255 | /* --- Test rig --- */ |
256 | |
257 | HASH_TEST(MD4, md4) |
258 | |
259 | /*----- That's all, folks -------------------------------------------------*/ |