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Linux/crypto/sha256_generic.c

  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 
 30 const 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 };
 36 EXPORT_SYMBOL_GPL(sha224_zero_message_hash);
 37 
 38 const 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 };
 44 EXPORT_SYMBOL_GPL(sha256_zero_message_hash);
 45 
 46 static inline u32 Ch(u32 x, u32 y, u32 z)
 47 {
 48         return z ^ (x & (y ^ z));
 49 }
 50 
 51 static 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 
 61 static inline void LOAD_OP(int I, u32 *W, const u8 *input)
 62 {
 63         W[I] = get_unaligned_be32((__u32 *)input + I);
 64 }
 65 
 66 static 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 
 71 static 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 
234 static 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 
243 int 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 }
248 EXPORT_SYMBOL(crypto_sha256_update);
249 
250 static 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 
256 int 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 }
262 EXPORT_SYMBOL(crypto_sha256_finup);
263 
264 static 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_flags      =       CRYPTO_ALG_TYPE_SHASH,
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_flags      =       CRYPTO_ALG_TYPE_SHASH,
289                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
290                 .cra_module     =       THIS_MODULE,
291         }
292 } };
293 
294 static int __init sha256_generic_mod_init(void)
295 {
296         return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
297 }
298 
299 static void __exit sha256_generic_mod_fini(void)
300 {
301         crypto_unregister_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
302 }
303 
304 module_init(sha256_generic_mod_init);
305 module_exit(sha256_generic_mod_fini);
306 
307 MODULE_LICENSE("GPL");
308 MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
309 
310 MODULE_ALIAS_CRYPTO("sha224");
311 MODULE_ALIAS_CRYPTO("sha224-generic");
312 MODULE_ALIAS_CRYPTO("sha256");
313 MODULE_ALIAS_CRYPTO("sha256-generic");
314 

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