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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: sha.c,v 1.4 2004/04/08 01:36:15 mdw Exp $ |
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4 | * |
5 | * Implementation of the SHA-1 hash 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 "sha.h" |
38 | |
39 | /*----- Main code ---------------------------------------------------------*/ |
40 | |
41 | /* --- @sha_compress@ --- * |
42 | * |
43 | * Arguments: @sha_ctx *ctx@ = pointer to context block |
44 | * @const void *sbuf@ = pointer to buffer of appropriate size |
45 | * |
46 | * Returns: --- |
47 | * |
48 | * Use: SHA-1 compression function. |
49 | */ |
50 | |
51 | void sha_compress(sha_ctx *ctx, const void *sbuf) |
52 | { |
53 | uint32 a, b, c, d, e; |
54 | uint32 buf[80]; |
55 | |
56 | /* --- Fetch the chaining variables --- */ |
57 | |
58 | a = ctx->a; |
59 | b = ctx->b; |
60 | c = ctx->c; |
61 | d = ctx->d; |
62 | e = ctx->e; |
63 | |
64 | /* --- Fetch and expand the buffer contents --- */ |
65 | |
66 | { |
67 | int i; |
68 | const octet *p; |
69 | |
70 | for (i = 0, p = sbuf; i < 16; i++, p += 4) |
71 | buf[i] = LOAD32(p); |
72 | for (i = 16; i < 80; i++) { |
73 | uint32 x = buf[i - 3] ^ buf[i - 8] ^ buf[i - 14] ^ buf[i - 16]; |
74 | buf[i] = ROL32(x, 1); |
75 | } |
76 | } |
77 | |
78 | /* --- Definitions for round functions --- */ |
79 | |
80 | #define F(x, y, z) (((x) & (y)) | (~(x) & (z))) |
81 | #define G(x, y, z) ((x) ^ (y) ^ (z)) |
82 | #define H(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z))) |
83 | |
84 | #define T(v, w, x, y, z, i, f, k) do { \ |
85 | z = ROL32(v, 5) + f(w, x, y) + z + buf[i] + k; \ |
86 | w = ROR32(w, 2); \ |
87 | } while (0) |
88 | |
89 | #define FF(v, w, x, y, z, i) T(v, w, x, y, z, i, F, 0x5a827999) |
90 | #define GG(v, w, x, y, z, i) T(v, w, x, y, z, i, G, 0x6ed9eba1) |
91 | #define HH(v, w, x, y, z, i) T(v, w, x, y, z, i, H, 0x8f1bbcdc) |
92 | #define II(v, w, x, y, z, i) T(v, w, x, y, z, i, G, 0xca62c1d6) |
93 | |
94 | /* --- The main compression function --- */ |
95 | |
96 | FF(a, b, c, d, e, 0); |
97 | FF(e, a, b, c, d, 1); |
98 | FF(d, e, a, b, c, 2); |
99 | FF(c, d, e, a, b, 3); |
100 | FF(b, c, d, e, a, 4); |
101 | FF(a, b, c, d, e, 5); |
102 | FF(e, a, b, c, d, 6); |
103 | FF(d, e, a, b, c, 7); |
104 | FF(c, d, e, a, b, 8); |
105 | FF(b, c, d, e, a, 9); |
106 | FF(a, b, c, d, e, 10); |
107 | FF(e, a, b, c, d, 11); |
108 | FF(d, e, a, b, c, 12); |
109 | FF(c, d, e, a, b, 13); |
110 | FF(b, c, d, e, a, 14); |
111 | FF(a, b, c, d, e, 15); |
112 | FF(e, a, b, c, d, 16); |
113 | FF(d, e, a, b, c, 17); |
114 | FF(c, d, e, a, b, 18); |
115 | FF(b, c, d, e, a, 19); |
116 | |
117 | GG(a, b, c, d, e, 20); |
118 | GG(e, a, b, c, d, 21); |
119 | GG(d, e, a, b, c, 22); |
120 | GG(c, d, e, a, b, 23); |
121 | GG(b, c, d, e, a, 24); |
122 | GG(a, b, c, d, e, 25); |
123 | GG(e, a, b, c, d, 26); |
124 | GG(d, e, a, b, c, 27); |
125 | GG(c, d, e, a, b, 28); |
126 | GG(b, c, d, e, a, 29); |
127 | GG(a, b, c, d, e, 30); |
128 | GG(e, a, b, c, d, 31); |
129 | GG(d, e, a, b, c, 32); |
130 | GG(c, d, e, a, b, 33); |
131 | GG(b, c, d, e, a, 34); |
132 | GG(a, b, c, d, e, 35); |
133 | GG(e, a, b, c, d, 36); |
134 | GG(d, e, a, b, c, 37); |
135 | GG(c, d, e, a, b, 38); |
136 | GG(b, c, d, e, a, 39); |
137 | |
138 | HH(a, b, c, d, e, 40); |
139 | HH(e, a, b, c, d, 41); |
140 | HH(d, e, a, b, c, 42); |
141 | HH(c, d, e, a, b, 43); |
142 | HH(b, c, d, e, a, 44); |
143 | HH(a, b, c, d, e, 45); |
144 | HH(e, a, b, c, d, 46); |
145 | HH(d, e, a, b, c, 47); |
146 | HH(c, d, e, a, b, 48); |
147 | HH(b, c, d, e, a, 49); |
148 | HH(a, b, c, d, e, 50); |
149 | HH(e, a, b, c, d, 51); |
150 | HH(d, e, a, b, c, 52); |
151 | HH(c, d, e, a, b, 53); |
152 | HH(b, c, d, e, a, 54); |
153 | HH(a, b, c, d, e, 55); |
154 | HH(e, a, b, c, d, 56); |
155 | HH(d, e, a, b, c, 57); |
156 | HH(c, d, e, a, b, 58); |
157 | HH(b, c, d, e, a, 59); |
158 | |
159 | II(a, b, c, d, e, 60); |
160 | II(e, a, b, c, d, 61); |
161 | II(d, e, a, b, c, 62); |
162 | II(c, d, e, a, b, 63); |
163 | II(b, c, d, e, a, 64); |
164 | II(a, b, c, d, e, 65); |
165 | II(e, a, b, c, d, 66); |
166 | II(d, e, a, b, c, 67); |
167 | II(c, d, e, a, b, 68); |
168 | II(b, c, d, e, a, 69); |
169 | II(a, b, c, d, e, 70); |
170 | II(e, a, b, c, d, 71); |
171 | II(d, e, a, b, c, 72); |
172 | II(c, d, e, a, b, 73); |
173 | II(b, c, d, e, a, 74); |
174 | II(a, b, c, d, e, 75); |
175 | II(e, a, b, c, d, 76); |
176 | II(d, e, a, b, c, 77); |
177 | II(c, d, e, a, b, 78); |
178 | II(b, c, d, e, a, 79); |
179 | |
180 | /* --- Update the chaining variables --- */ |
181 | |
182 | ctx->a += a; |
183 | ctx->b += b; |
184 | ctx->c += c; |
185 | ctx->d += d; |
186 | ctx->e += e; |
187 | } |
188 | |
189 | /* --- @sha_init@ --- * |
190 | * |
191 | * Arguments: @sha_ctx *ctx@ = pointer to context block to initialize |
192 | * |
193 | * Returns: --- |
194 | * |
195 | * Use: Initializes a context block ready for hashing. |
196 | */ |
197 | |
198 | void sha_init(sha_ctx *ctx) |
199 | { |
200 | ctx->a = 0x67452301; |
201 | ctx->b = 0xefcdab89; |
202 | ctx->c = 0x98badcfe; |
203 | ctx->d = 0x10325476; |
204 | ctx->e = 0xc3d2e1f0; |
205 | ctx->off = 0; |
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206 | ctx->nl = ctx->nh = 0; |
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207 | } |
208 | |
209 | /* --- @sha_set@ --- * |
210 | * |
211 | * Arguments: @sha_ctx *ctx@ = pointer to context block |
212 | * @const void *buf@ = pointer to state buffer |
213 | * @unsigned long count@ = current count of bytes processed |
214 | * |
215 | * Returns: --- |
216 | * |
217 | * Use: Initializes a context block from a given state. This is |
218 | * useful in cases where the initial hash state is meant to be |
219 | * secret, e.g., for NMAC and HMAC support. |
220 | */ |
221 | |
222 | void sha_set(sha_ctx *ctx, const void *buf, unsigned long count) |
223 | { |
224 | const octet *p = buf; |
225 | ctx->a = LOAD32(p + 0); |
226 | ctx->b = LOAD32(p + 4); |
227 | ctx->c = LOAD32(p + 8); |
228 | ctx->d = LOAD32(p + 12); |
229 | ctx->e = LOAD32(p + 16); |
230 | ctx->off = 0; |
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231 | ctx->nl = U32(count); |
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232 | ctx->nh = U32(((count & ~MASK32) >> 16) >> 16); |
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233 | } |
234 | |
235 | /* --- @sha_hash@ --- * |
236 | * |
237 | * Arguments: @sha_ctx *ctx@ = pointer to context block |
238 | * @const void *buf@ = buffer of data to hash |
239 | * @size_t sz@ = size of buffer to hash |
240 | * |
241 | * Returns: --- |
242 | * |
243 | * Use: Hashes a buffer of data. The buffer may be of any size and |
244 | * alignment. |
245 | */ |
246 | |
247 | void sha_hash(sha_ctx *ctx, const void *buf, size_t sz) |
248 | { |
249 | HASH_BUFFER(SHA, sha, ctx, buf, sz); |
250 | } |
251 | |
252 | /* --- @sha_done@ --- * |
253 | * |
254 | * Arguments: @sha_ctx *ctx@ = pointer to context block |
255 | * @void *hash@ = pointer to output buffer |
256 | * |
257 | * Returns: --- |
258 | * |
259 | * Use: Returns the hash of the data read so far. |
260 | */ |
261 | |
262 | void sha_done(sha_ctx *ctx, void *hash) |
263 | { |
264 | octet *p = hash; |
265 | HASH_PAD(SHA, sha, ctx, 0x80, 0, 8); |
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266 | STORE32(ctx->buf + SHA_BUFSZ - 8, (ctx->nl >> 29) | (ctx->nh << 3)); |
267 | STORE32(ctx->buf + SHA_BUFSZ - 4, ctx->nl << 3); |
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268 | sha_compress(ctx, ctx->buf); |
269 | STORE32(p + 0, ctx->a); |
270 | STORE32(p + 4, ctx->b); |
271 | STORE32(p + 8, ctx->c); |
272 | STORE32(p + 12, ctx->d); |
273 | STORE32(p + 16, ctx->e); |
274 | } |
275 | |
276 | /* --- @sha_state@ --- * |
277 | * |
278 | * Arguments: @sha_ctx *ctx@ = pointer to context |
279 | * @void *state@ = pointer to buffer for current state |
280 | * |
281 | * Returns: Number of bytes written to the hash function so far. |
282 | * |
283 | * Use: Returns the current state of the hash function such that |
284 | * it can be passed to @sha_set@. |
285 | */ |
286 | |
287 | unsigned long sha_state(sha_ctx *ctx, void *state) |
288 | { |
289 | octet *p = state; |
290 | STORE32(p + 0, ctx->a); |
291 | STORE32(p + 4, ctx->b); |
292 | STORE32(p + 8, ctx->c); |
293 | STORE32(p + 12, ctx->d); |
294 | STORE32(p + 16, ctx->e); |
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295 | return (ctx->nl | ((ctx->nh << 16) << 16)); |
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296 | } |
297 | |
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298 | /* --- Generic interface --- */ |
299 | |
300 | GHASH_DEF(SHA, sha) |
301 | |
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302 | /* --- Test code --- */ |
303 | |
304 | HASH_TEST(SHA, sha) |
305 | |
306 | /*----- That's all, folks -------------------------------------------------*/ |