1/*
2 * Cryptographic API.
3 *
4 * SHA-256, as specified in
5 * http://csrc.nist.gov/groups/STM/cavp/documents/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 * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
13 *
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU General Public License as published by the Free
16 * Software Foundation; either version 2 of the License, or (at your option)
17 * any later version.
18 *
19 */
20#include <crypto/internal/hash.h>
21#include <linux/init.h>
22#include <linux/module.h>
23#include <linux/mm.h>
24#include <linux/types.h>
25#include <crypto/sha.h>
26#include <crypto/sha256_base.h>
27#include <asm/byteorder.h>
28#include <asm/unaligned.h>
29
30const u8 sha224_zero_message_hash[SHA224_DIGEST_SIZE] = {
31 0xd1, 0x4a, 0x02, 0x8c, 0x2a, 0x3a, 0x2b, 0xc9, 0x47,
32 0x61, 0x02, 0xbb, 0x28, 0x82, 0x34, 0xc4, 0x15, 0xa2,
33 0xb0, 0x1f, 0x82, 0x8e, 0xa6, 0x2a, 0xc5, 0xb3, 0xe4,
34 0x2f
35};
36EXPORT_SYMBOL_GPL(sha224_zero_message_hash);
37
38const u8 sha256_zero_message_hash[SHA256_DIGEST_SIZE] = {
39 0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14,
40 0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24,
41 0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c,
42 0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55
43};
44EXPORT_SYMBOL_GPL(sha256_zero_message_hash);
45
46static inline u32 Ch(u32 x, u32 y, u32 z)
47{
48 return z ^ (x & (y ^ z));
49}
50
51static inline u32 Maj(u32 x, u32 y, u32 z)
52{
53 return (x & y) | (z & (x | y));
54}
55
56#define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22))
57#define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25))
58#define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3))
59#define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10))
60
61static inline void LOAD_OP(int I, u32 *W, const u8 *input)
62{
63 W[I] = get_unaligned_be32((__u32 *)input + I);
64}
65
66static inline void BLEND_OP(int I, u32 *W)
67{
68 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
69}
70
71static void sha256_transform(u32 *state, const u8 *input)
72{
73 u32 a, b, c, d, e, f, g, h, t1, t2;
74 u32 W[64];
75 int i;
76
77 /* load the input */
78 for (i = 0; i < 16; i++)
79 LOAD_OP(i, W, input);
80
81 /* now blend */
82 for (i = 16; i < 64; i++)
83 BLEND_OP(i, W);
84
85 /* load the state into our registers */
86 a=state[0]; b=state[1]; c=state[2]; d=state[3];
87 e=state[4]; f=state[5]; g=state[6]; h=state[7];
88
89 /* now iterate */
90 t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0];
91 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
92 t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1];
93 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
94 t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2];
95 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
96 t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3];
97 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
98 t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4];
99 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
100 t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5];
101 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
102 t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6];
103 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
104 t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7];
105 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
106
107 t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8];
108 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
109 t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9];
110 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
111 t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10];
112 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
113 t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11];
114 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
115 t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12];
116 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
117 t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13];
118 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
119 t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14];
120 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
121 t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15];
122 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
123
124 t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16];
125 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
126 t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17];
127 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
128 t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18];
129 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
130 t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19];
131 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
132 t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20];
133 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
134 t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21];
135 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
136 t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22];
137 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
138 t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23];
139 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
140
141 t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24];
142 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
143 t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25];
144 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
145 t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26];
146 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
147 t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27];
148 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
149 t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28];
150 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
151 t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29];
152 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
153 t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30];
154 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
155 t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31];
156 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
157
158 t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32];
159 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
160 t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33];
161 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
162 t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34];
163 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
164 t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35];
165 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
166 t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36];
167 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
168 t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37];
169 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
170 t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38];
171 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
172 t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39];
173 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
174
175 t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40];
176 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
177 t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41];
178 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
179 t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42];
180 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
181 t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43];
182 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
183 t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44];
184 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
185 t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45];
186 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
187 t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46];
188 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
189 t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47];
190 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
191
192 t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48];
193 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
194 t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49];
195 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
196 t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50];
197 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
198 t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51];
199 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
200 t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52];
201 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
202 t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53];
203 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
204 t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54];
205 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
206 t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55];
207 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
208
209 t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56];
210 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
211 t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57];
212 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
213 t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58];
214 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
215 t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59];
216 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
217 t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60];
218 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
219 t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61];
220 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
221 t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62];
222 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
223 t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63];
224 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
225
226 state[0] += a; state[1] += b; state[2] += c; state[3] += d;
227 state[4] += e; state[5] += f; state[6] += g; state[7] += h;
228
229 /* clear any sensitive info... */
230 a = b = c = d = e = f = g = h = t1 = t2 = 0;
231 memzero_explicit(W, 64 * sizeof(u32));
232}
233
234static void sha256_generic_block_fn(struct sha256_state *sst, u8 const *src,
235 int blocks)
236{
237 while (blocks--) {
238 sha256_transform(sst->state, src);
239 src += SHA256_BLOCK_SIZE;
240 }
241}
242
243int crypto_sha256_update(struct shash_desc *desc, const u8 *data,
244 unsigned int len)
245{
246 return sha256_base_do_update(desc, data, len, sha256_generic_block_fn);
247}
248EXPORT_SYMBOL(crypto_sha256_update);
249
250static int sha256_final(struct shash_desc *desc, u8 *out)
251{
252 sha256_base_do_finalize(desc, sha256_generic_block_fn);
253 return sha256_base_finish(desc, out);
254}
255
256int crypto_sha256_finup(struct shash_desc *desc, const u8 *data,
257 unsigned int len, u8 *hash)
258{
259 sha256_base_do_update(desc, data, len, sha256_generic_block_fn);
260 return sha256_final(desc, hash);
261}
262EXPORT_SYMBOL(crypto_sha256_finup);
263
264static struct shash_alg sha256_algs[2] = { {
265 .digestsize = SHA256_DIGEST_SIZE,
266 .init = sha256_base_init,
267 .update = crypto_sha256_update,
268 .final = sha256_final,
269 .finup = crypto_sha256_finup,
270 .descsize = sizeof(struct sha256_state),
271 .base = {
272 .cra_name = "sha256",
273 .cra_driver_name= "sha256-generic",
274 .cra_priority = 100,
275 .cra_blocksize = SHA256_BLOCK_SIZE,
276 .cra_module = THIS_MODULE,
277 }
278}, {
279 .digestsize = SHA224_DIGEST_SIZE,
280 .init = sha224_base_init,
281 .update = crypto_sha256_update,
282 .final = sha256_final,
283 .finup = crypto_sha256_finup,
284 .descsize = sizeof(struct sha256_state),
285 .base = {
286 .cra_name = "sha224",
287 .cra_driver_name= "sha224-generic",
288 .cra_priority = 100,
289 .cra_blocksize = SHA224_BLOCK_SIZE,
290 .cra_module = THIS_MODULE,
291 }
292} };
293
294static int __init sha256_generic_mod_init(void)
295{
296 return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
297}
298
299static void __exit sha256_generic_mod_fini(void)
300{
301 crypto_unregister_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
302}
303
304module_init(sha256_generic_mod_init);
305module_exit(sha256_generic_mod_fini);
306
307MODULE_LICENSE("GPL");
308MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
309
310MODULE_ALIAS_CRYPTO("sha224");
311MODULE_ALIAS_CRYPTO("sha224-generic");
312MODULE_ALIAS_CRYPTO("sha256");
313MODULE_ALIAS_CRYPTO("sha256-generic");
314