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TOMOYO Linux Cross Reference
Linux/crypto/sha256_generic.c

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  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 <asm/byteorder.h>
 27 #include <asm/unaligned.h>
 28 
 29 static inline u32 Ch(u32 x, u32 y, u32 z)
 30 {
 31         return z ^ (x & (y ^ z));
 32 }
 33 
 34 static inline u32 Maj(u32 x, u32 y, u32 z)
 35 {
 36         return (x & y) | (z & (x | y));
 37 }
 38 
 39 #define e0(x)       (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22))
 40 #define e1(x)       (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25))
 41 #define s0(x)       (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3))
 42 #define s1(x)       (ror32(x,17) ^ ror32(x,19) ^ (x >> 10))
 43 
 44 static inline void LOAD_OP(int I, u32 *W, const u8 *input)
 45 {
 46         W[I] = get_unaligned_be32((__u32 *)input + I);
 47 }
 48 
 49 static inline void BLEND_OP(int I, u32 *W)
 50 {
 51         W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
 52 }
 53 
 54 static void sha256_transform(u32 *state, const u8 *input)
 55 {
 56         u32 a, b, c, d, e, f, g, h, t1, t2;
 57         u32 W[64];
 58         int i;
 59 
 60         /* load the input */
 61         for (i = 0; i < 16; i++)
 62                 LOAD_OP(i, W, input);
 63 
 64         /* now blend */
 65         for (i = 16; i < 64; i++)
 66                 BLEND_OP(i, W);
 67 
 68         /* load the state into our registers */
 69         a=state[0];  b=state[1];  c=state[2];  d=state[3];
 70         e=state[4];  f=state[5];  g=state[6];  h=state[7];
 71 
 72         /* now iterate */
 73         t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0];
 74         t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 75         t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1];
 76         t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 77         t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2];
 78         t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 79         t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3];
 80         t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 81         t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4];
 82         t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 83         t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5];
 84         t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 85         t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6];
 86         t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 87         t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7];
 88         t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
 89 
 90         t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8];
 91         t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 92         t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9];
 93         t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 94         t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10];
 95         t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 96         t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11];
 97         t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 98         t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12];
 99         t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
100         t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13];
101         t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
102         t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14];
103         t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
104         t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15];
105         t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
106 
107         t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16];
108         t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
109         t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17];
110         t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
111         t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18];
112         t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
113         t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19];
114         t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
115         t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20];
116         t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
117         t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21];
118         t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
119         t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22];
120         t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
121         t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23];
122         t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
123 
124         t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24];
125         t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
126         t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25];
127         t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
128         t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26];
129         t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
130         t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27];
131         t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
132         t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28];
133         t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
134         t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29];
135         t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
136         t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30];
137         t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
138         t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31];
139         t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
140 
141         t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32];
142         t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
143         t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33];
144         t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
145         t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34];
146         t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
147         t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35];
148         t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
149         t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36];
150         t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
151         t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37];
152         t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
153         t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38];
154         t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
155         t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39];
156         t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
157 
158         t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40];
159         t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
160         t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41];
161         t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
162         t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42];
163         t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
164         t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43];
165         t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
166         t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44];
167         t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
168         t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45];
169         t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
170         t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46];
171         t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
172         t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47];
173         t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
174 
175         t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48];
176         t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
177         t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49];
178         t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
179         t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50];
180         t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
181         t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51];
182         t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
183         t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52];
184         t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
185         t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53];
186         t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
187         t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54];
188         t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
189         t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55];
190         t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
191 
192         t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56];
193         t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
194         t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57];
195         t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
196         t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58];
197         t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
198         t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59];
199         t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
200         t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60];
201         t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
202         t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61];
203         t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
204         t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62];
205         t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
206         t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63];
207         t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
208 
209         state[0] += a; state[1] += b; state[2] += c; state[3] += d;
210         state[4] += e; state[5] += f; state[6] += g; state[7] += h;
211 
212         /* clear any sensitive info... */
213         a = b = c = d = e = f = g = h = t1 = t2 = 0;
214         memzero_explicit(W, 64 * sizeof(u32));
215 }
216 
217 static int sha224_init(struct shash_desc *desc)
218 {
219         struct sha256_state *sctx = shash_desc_ctx(desc);
220         sctx->state[0] = SHA224_H0;
221         sctx->state[1] = SHA224_H1;
222         sctx->state[2] = SHA224_H2;
223         sctx->state[3] = SHA224_H3;
224         sctx->state[4] = SHA224_H4;
225         sctx->state[5] = SHA224_H5;
226         sctx->state[6] = SHA224_H6;
227         sctx->state[7] = SHA224_H7;
228         sctx->count = 0;
229 
230         return 0;
231 }
232 
233 static int sha256_init(struct shash_desc *desc)
234 {
235         struct sha256_state *sctx = shash_desc_ctx(desc);
236         sctx->state[0] = SHA256_H0;
237         sctx->state[1] = SHA256_H1;
238         sctx->state[2] = SHA256_H2;
239         sctx->state[3] = SHA256_H3;
240         sctx->state[4] = SHA256_H4;
241         sctx->state[5] = SHA256_H5;
242         sctx->state[6] = SHA256_H6;
243         sctx->state[7] = SHA256_H7;
244         sctx->count = 0;
245 
246         return 0;
247 }
248 
249 int crypto_sha256_update(struct shash_desc *desc, const u8 *data,
250                           unsigned int len)
251 {
252         struct sha256_state *sctx = shash_desc_ctx(desc);
253         unsigned int partial, done;
254         const u8 *src;
255 
256         partial = sctx->count & 0x3f;
257         sctx->count += len;
258         done = 0;
259         src = data;
260 
261         if ((partial + len) > 63) {
262                 if (partial) {
263                         done = -partial;
264                         memcpy(sctx->buf + partial, data, done + 64);
265                         src = sctx->buf;
266                 }
267 
268                 do {
269                         sha256_transform(sctx->state, src);
270                         done += 64;
271                         src = data + done;
272                 } while (done + 63 < len);
273 
274                 partial = 0;
275         }
276         memcpy(sctx->buf + partial, src, len - done);
277 
278         return 0;
279 }
280 EXPORT_SYMBOL(crypto_sha256_update);
281 
282 static int sha256_final(struct shash_desc *desc, u8 *out)
283 {
284         struct sha256_state *sctx = shash_desc_ctx(desc);
285         __be32 *dst = (__be32 *)out;
286         __be64 bits;
287         unsigned int index, pad_len;
288         int i;
289         static const u8 padding[64] = { 0x80, };
290 
291         /* Save number of bits */
292         bits = cpu_to_be64(sctx->count << 3);
293 
294         /* Pad out to 56 mod 64. */
295         index = sctx->count & 0x3f;
296         pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
297         crypto_sha256_update(desc, padding, pad_len);
298 
299         /* Append length (before padding) */
300         crypto_sha256_update(desc, (const u8 *)&bits, sizeof(bits));
301 
302         /* Store state in digest */
303         for (i = 0; i < 8; i++)
304                 dst[i] = cpu_to_be32(sctx->state[i]);
305 
306         /* Zeroize sensitive information. */
307         memset(sctx, 0, sizeof(*sctx));
308 
309         return 0;
310 }
311 
312 static int sha224_final(struct shash_desc *desc, u8 *hash)
313 {
314         u8 D[SHA256_DIGEST_SIZE];
315 
316         sha256_final(desc, D);
317 
318         memcpy(hash, D, SHA224_DIGEST_SIZE);
319         memzero_explicit(D, SHA256_DIGEST_SIZE);
320 
321         return 0;
322 }
323 
324 static int sha256_export(struct shash_desc *desc, void *out)
325 {
326         struct sha256_state *sctx = shash_desc_ctx(desc);
327 
328         memcpy(out, sctx, sizeof(*sctx));
329         return 0;
330 }
331 
332 static int sha256_import(struct shash_desc *desc, const void *in)
333 {
334         struct sha256_state *sctx = shash_desc_ctx(desc);
335 
336         memcpy(sctx, in, sizeof(*sctx));
337         return 0;
338 }
339 
340 static struct shash_alg sha256_algs[2] = { {
341         .digestsize     =       SHA256_DIGEST_SIZE,
342         .init           =       sha256_init,
343         .update         =       crypto_sha256_update,
344         .final          =       sha256_final,
345         .export         =       sha256_export,
346         .import         =       sha256_import,
347         .descsize       =       sizeof(struct sha256_state),
348         .statesize      =       sizeof(struct sha256_state),
349         .base           =       {
350                 .cra_name       =       "sha256",
351                 .cra_driver_name=       "sha256-generic",
352                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
353                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
354                 .cra_module     =       THIS_MODULE,
355         }
356 }, {
357         .digestsize     =       SHA224_DIGEST_SIZE,
358         .init           =       sha224_init,
359         .update         =       crypto_sha256_update,
360         .final          =       sha224_final,
361         .descsize       =       sizeof(struct sha256_state),
362         .base           =       {
363                 .cra_name       =       "sha224",
364                 .cra_driver_name=       "sha224-generic",
365                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
366                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
367                 .cra_module     =       THIS_MODULE,
368         }
369 } };
370 
371 static int __init sha256_generic_mod_init(void)
372 {
373         return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
374 }
375 
376 static void __exit sha256_generic_mod_fini(void)
377 {
378         crypto_unregister_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
379 }
380 
381 module_init(sha256_generic_mod_init);
382 module_exit(sha256_generic_mod_fini);
383 
384 MODULE_LICENSE("GPL");
385 MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
386 
387 MODULE_ALIAS_CRYPTO("sha224");
388 MODULE_ALIAS_CRYPTO("sha224-generic");
389 MODULE_ALIAS_CRYPTO("sha256");
390 MODULE_ALIAS_CRYPTO("sha256-generic");
391 

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