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1da177e4 LT |
1 | /* |
2 | * Cryptographic API. | |
3 | * | |
4 | * SHA-256, as specified in | |
5 | * http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf | |
6 | * | |
7 | * SHA-256 code by Jean-Luc Cooke <jlcooke@certainkey.com>. | |
8 | * | |
9 | * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com> | |
10 | * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> | |
11 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify it | |
14 | * under the terms of the GNU General Public License as published by the Free | |
15 | * Software Foundation; either version 2 of the License, or (at your option) | |
16 | * any later version. | |
17 | * | |
18 | */ | |
19 | #include <linux/init.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/crypto.h> | |
06ace7a9 | 23 | #include <linux/types.h> |
5265eeb2 | 24 | #include <crypto/sha.h> |
1da177e4 LT |
25 | #include <asm/byteorder.h> |
26 | ||
1da177e4 LT |
27 | struct sha256_ctx { |
28 | u32 count[2]; | |
29 | u32 state[8]; | |
30 | u8 buf[128]; | |
31 | }; | |
32 | ||
33 | static inline u32 Ch(u32 x, u32 y, u32 z) | |
34 | { | |
35 | return z ^ (x & (y ^ z)); | |
36 | } | |
37 | ||
38 | static inline u32 Maj(u32 x, u32 y, u32 z) | |
39 | { | |
40 | return (x & y) | (z & (x | y)); | |
41 | } | |
42 | ||
43 | #define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22)) | |
44 | #define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25)) | |
45 | #define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3)) | |
46 | #define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10)) | |
47 | ||
1da177e4 LT |
48 | static inline void LOAD_OP(int I, u32 *W, const u8 *input) |
49 | { | |
50 | W[I] = __be32_to_cpu( ((__be32*)(input))[I] ); | |
51 | } | |
52 | ||
53 | static inline void BLEND_OP(int I, u32 *W) | |
54 | { | |
55 | W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16]; | |
56 | } | |
57 | ||
58 | static void sha256_transform(u32 *state, const u8 *input) | |
59 | { | |
60 | u32 a, b, c, d, e, f, g, h, t1, t2; | |
61 | u32 W[64]; | |
62 | int i; | |
63 | ||
64 | /* load the input */ | |
65 | for (i = 0; i < 16; i++) | |
66 | LOAD_OP(i, W, input); | |
67 | ||
68 | /* now blend */ | |
69 | for (i = 16; i < 64; i++) | |
70 | BLEND_OP(i, W); | |
71 | ||
72 | /* load the state into our registers */ | |
73 | a=state[0]; b=state[1]; c=state[2]; d=state[3]; | |
74 | e=state[4]; f=state[5]; g=state[6]; h=state[7]; | |
75 | ||
76 | /* now iterate */ | |
77 | t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0]; | |
78 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; | |
79 | t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1]; | |
80 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; | |
81 | t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2]; | |
82 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; | |
83 | t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3]; | |
84 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; | |
85 | t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4]; | |
86 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; | |
87 | t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5]; | |
88 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; | |
89 | t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6]; | |
90 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; | |
91 | t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7]; | |
92 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; | |
93 | ||
94 | t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8]; | |
95 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; | |
96 | t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9]; | |
97 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; | |
98 | t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10]; | |
99 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; | |
100 | t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11]; | |
101 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; | |
102 | t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12]; | |
103 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; | |
104 | t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13]; | |
105 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; | |
106 | t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14]; | |
107 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; | |
108 | t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15]; | |
109 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; | |
110 | ||
111 | t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16]; | |
112 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; | |
113 | t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17]; | |
114 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; | |
115 | t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18]; | |
116 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; | |
117 | t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19]; | |
118 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; | |
119 | t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20]; | |
120 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; | |
121 | t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21]; | |
122 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; | |
123 | t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22]; | |
124 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; | |
125 | t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23]; | |
126 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; | |
127 | ||
128 | t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24]; | |
129 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; | |
130 | t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25]; | |
131 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; | |
132 | t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26]; | |
133 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; | |
134 | t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27]; | |
135 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; | |
136 | t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28]; | |
137 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; | |
138 | t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29]; | |
139 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; | |
140 | t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30]; | |
141 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; | |
142 | t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31]; | |
143 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; | |
144 | ||
145 | t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32]; | |
146 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; | |
147 | t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33]; | |
148 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; | |
149 | t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34]; | |
150 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; | |
151 | t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35]; | |
152 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; | |
153 | t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36]; | |
154 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; | |
155 | t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37]; | |
156 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; | |
157 | t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38]; | |
158 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; | |
159 | t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39]; | |
160 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; | |
161 | ||
162 | t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40]; | |
163 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; | |
164 | t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41]; | |
165 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; | |
166 | t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42]; | |
167 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; | |
168 | t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43]; | |
169 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; | |
170 | t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44]; | |
171 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; | |
172 | t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45]; | |
173 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; | |
174 | t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46]; | |
175 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; | |
176 | t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47]; | |
177 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; | |
178 | ||
179 | t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48]; | |
180 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; | |
181 | t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49]; | |
182 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; | |
183 | t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50]; | |
184 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; | |
185 | t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51]; | |
186 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; | |
187 | t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52]; | |
188 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; | |
189 | t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53]; | |
190 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; | |
191 | t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54]; | |
192 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; | |
193 | t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55]; | |
194 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; | |
195 | ||
196 | t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56]; | |
197 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; | |
198 | t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57]; | |
199 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; | |
200 | t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58]; | |
201 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; | |
202 | t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59]; | |
203 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; | |
204 | t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60]; | |
205 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; | |
206 | t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61]; | |
207 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; | |
208 | t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62]; | |
209 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; | |
210 | t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63]; | |
211 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; | |
212 | ||
213 | state[0] += a; state[1] += b; state[2] += c; state[3] += d; | |
214 | state[4] += e; state[5] += f; state[6] += g; state[7] += h; | |
215 | ||
216 | /* clear any sensitive info... */ | |
217 | a = b = c = d = e = f = g = h = t1 = t2 = 0; | |
218 | memset(W, 0, 64 * sizeof(u32)); | |
219 | } | |
220 | ||
6c2bb98b | 221 | static void sha256_init(struct crypto_tfm *tfm) |
1da177e4 | 222 | { |
6c2bb98b | 223 | struct sha256_ctx *sctx = crypto_tfm_ctx(tfm); |
5265eeb2 JG |
224 | sctx->state[0] = SHA256_H0; |
225 | sctx->state[1] = SHA256_H1; | |
226 | sctx->state[2] = SHA256_H2; | |
227 | sctx->state[3] = SHA256_H3; | |
228 | sctx->state[4] = SHA256_H4; | |
229 | sctx->state[5] = SHA256_H5; | |
230 | sctx->state[6] = SHA256_H6; | |
231 | sctx->state[7] = SHA256_H7; | |
1da177e4 | 232 | sctx->count[0] = sctx->count[1] = 0; |
1da177e4 LT |
233 | } |
234 | ||
6c2bb98b HX |
235 | static void sha256_update(struct crypto_tfm *tfm, const u8 *data, |
236 | unsigned int len) | |
1da177e4 | 237 | { |
6c2bb98b | 238 | struct sha256_ctx *sctx = crypto_tfm_ctx(tfm); |
1da177e4 LT |
239 | unsigned int i, index, part_len; |
240 | ||
241 | /* Compute number of bytes mod 128 */ | |
242 | index = (unsigned int)((sctx->count[0] >> 3) & 0x3f); | |
243 | ||
244 | /* Update number of bits */ | |
245 | if ((sctx->count[0] += (len << 3)) < (len << 3)) { | |
246 | sctx->count[1]++; | |
247 | sctx->count[1] += (len >> 29); | |
248 | } | |
249 | ||
250 | part_len = 64 - index; | |
251 | ||
252 | /* Transform as many times as possible. */ | |
253 | if (len >= part_len) { | |
254 | memcpy(&sctx->buf[index], data, part_len); | |
255 | sha256_transform(sctx->state, sctx->buf); | |
256 | ||
257 | for (i = part_len; i + 63 < len; i += 64) | |
258 | sha256_transform(sctx->state, &data[i]); | |
259 | index = 0; | |
260 | } else { | |
261 | i = 0; | |
262 | } | |
263 | ||
264 | /* Buffer remaining input */ | |
265 | memcpy(&sctx->buf[index], &data[i], len-i); | |
266 | } | |
267 | ||
6c2bb98b | 268 | static void sha256_final(struct crypto_tfm *tfm, u8 *out) |
1da177e4 | 269 | { |
6c2bb98b | 270 | struct sha256_ctx *sctx = crypto_tfm_ctx(tfm); |
06ace7a9 HX |
271 | __be32 *dst = (__be32 *)out; |
272 | __be32 bits[2]; | |
273 | unsigned int index, pad_len; | |
274 | int i; | |
1da177e4 LT |
275 | static const u8 padding[64] = { 0x80, }; |
276 | ||
277 | /* Save number of bits */ | |
06ace7a9 HX |
278 | bits[1] = cpu_to_be32(sctx->count[0]); |
279 | bits[0] = cpu_to_be32(sctx->count[1]); | |
1da177e4 LT |
280 | |
281 | /* Pad out to 56 mod 64. */ | |
282 | index = (sctx->count[0] >> 3) & 0x3f; | |
283 | pad_len = (index < 56) ? (56 - index) : ((64+56) - index); | |
6c2bb98b | 284 | sha256_update(tfm, padding, pad_len); |
1da177e4 LT |
285 | |
286 | /* Append length (before padding) */ | |
6c2bb98b | 287 | sha256_update(tfm, (const u8 *)bits, sizeof(bits)); |
1da177e4 LT |
288 | |
289 | /* Store state in digest */ | |
06ace7a9 HX |
290 | for (i = 0; i < 8; i++) |
291 | dst[i] = cpu_to_be32(sctx->state[i]); | |
1da177e4 LT |
292 | |
293 | /* Zeroize sensitive information. */ | |
294 | memset(sctx, 0, sizeof(*sctx)); | |
295 | } | |
296 | ||
297 | ||
298 | static struct crypto_alg alg = { | |
299 | .cra_name = "sha256", | |
b3be9a6d | 300 | .cra_driver_name= "sha256-generic", |
1da177e4 | 301 | .cra_flags = CRYPTO_ALG_TYPE_DIGEST, |
5265eeb2 | 302 | .cra_blocksize = SHA256_BLOCK_SIZE, |
1da177e4 LT |
303 | .cra_ctxsize = sizeof(struct sha256_ctx), |
304 | .cra_module = THIS_MODULE, | |
e1147d8f | 305 | .cra_alignmask = 3, |
1da177e4 LT |
306 | .cra_list = LIST_HEAD_INIT(alg.cra_list), |
307 | .cra_u = { .digest = { | |
308 | .dia_digestsize = SHA256_DIGEST_SIZE, | |
309 | .dia_init = sha256_init, | |
310 | .dia_update = sha256_update, | |
311 | .dia_final = sha256_final } } | |
312 | }; | |
313 | ||
314 | static int __init init(void) | |
315 | { | |
316 | return crypto_register_alg(&alg); | |
317 | } | |
318 | ||
319 | static void __exit fini(void) | |
320 | { | |
321 | crypto_unregister_alg(&alg); | |
322 | } | |
323 | ||
324 | module_init(init); | |
325 | module_exit(fini); | |
326 | ||
327 | MODULE_LICENSE("GPL"); | |
328 | MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm"); | |
b3be9a6d | 329 | |
ad5d2789 | 330 | MODULE_ALIAS("sha256"); |