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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 <[email protected]>.
8  *
9  * Copyright (c) Jean-Luc Cooke <[email protected]>
10  * Copyright (c) Andrew McDonald <[email protected]>
11  * Copyright (c) 2002 James Morris <[email protected]>
12  * SHA224 Support Copyright 2007 Intel Corporation <[email protected]>
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 
28 static inline u32 Ch(u32 x, u32 y, u32 z)
29 {
30  return z ^ (x & (y ^ z));
31 }
32 
33 static inline u32 Maj(u32 x, u32 y, u32 z)
34 {
35  return (x & y) | (z & (x | y));
36 }
37 
38 #define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22))
39 #define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25))
40 #define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3))
41 #define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10))
42 
43 static inline void LOAD_OP(int I, u32 *W, const u8 *input)
44 {
45  W[I] = __be32_to_cpu( ((__be32*)(input))[I] );
46 }
47 
48 static inline void BLEND_OP(int I, u32 *W)
49 {
50  W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
51 }
52 
53 static void sha256_transform(u32 *state, const u8 *input)
54 {
55  u32 a, b, c, d, e, f, g, h, t1, t2;
56  u32 W[64];
57  int i;
58 
59  /* load the input */
60  for (i = 0; i < 16; i++)
61  LOAD_OP(i, W, input);
62 
63  /* now blend */
64  for (i = 16; i < 64; i++)
65  BLEND_OP(i, W);
66 
67  /* load the state into our registers */
68  a=state[0]; b=state[1]; c=state[2]; d=state[3];
69  e=state[4]; f=state[5]; g=state[6]; h=state[7];
70 
71  /* now iterate */
72  t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0];
73  t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
74  t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1];
75  t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
76  t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2];
77  t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
78  t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3];
79  t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
80  t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4];
81  t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
82  t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5];
83  t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
84  t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6];
85  t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
86  t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7];
87  t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
88 
89  t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8];
90  t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
91  t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9];
92  t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
93  t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10];
94  t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
95  t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11];
96  t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
97  t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12];
98  t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
99  t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13];
100  t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
101  t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14];
102  t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
103  t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15];
104  t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
105 
106  t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16];
107  t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
108  t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17];
109  t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
110  t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18];
111  t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
112  t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19];
113  t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
114  t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20];
115  t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
116  t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21];
117  t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
118  t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22];
119  t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
120  t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23];
121  t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
122 
123  t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24];
124  t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
125  t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25];
126  t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
127  t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26];
128  t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
129  t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27];
130  t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
131  t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28];
132  t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
133  t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29];
134  t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
135  t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30];
136  t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
137  t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31];
138  t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
139 
140  t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32];
141  t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
142  t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33];
143  t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
144  t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34];
145  t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
146  t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35];
147  t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
148  t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36];
149  t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
150  t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37];
151  t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
152  t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38];
153  t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
154  t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39];
155  t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
156 
157  t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40];
158  t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
159  t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41];
160  t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
161  t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42];
162  t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
163  t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43];
164  t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
165  t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44];
166  t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
167  t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45];
168  t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
169  t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46];
170  t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
171  t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47];
172  t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
173 
174  t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48];
175  t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
176  t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49];
177  t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
178  t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50];
179  t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
180  t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51];
181  t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
182  t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52];
183  t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
184  t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53];
185  t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
186  t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54];
187  t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
188  t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55];
189  t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
190 
191  t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56];
192  t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
193  t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57];
194  t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
195  t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58];
196  t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
197  t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59];
198  t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
199  t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60];
200  t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
201  t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61];
202  t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
203  t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62];
204  t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
205  t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63];
206  t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
207 
208  state[0] += a; state[1] += b; state[2] += c; state[3] += d;
209  state[4] += e; state[5] += f; state[6] += g; state[7] += h;
210 
211  /* clear any sensitive info... */
212  a = b = c = d = e = f = g = h = t1 = t2 = 0;
213  memset(W, 0, 64 * sizeof(u32));
214 }
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 static int 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 
281 static int sha256_final(struct shash_desc *desc, u8 *out)
282 {
283  struct sha256_state *sctx = shash_desc_ctx(desc);
284  __be32 *dst = (__be32 *)out;
285  __be64 bits;
286  unsigned int index, pad_len;
287  int i;
288  static const u8 padding[64] = { 0x80, };
289 
290  /* Save number of bits */
291  bits = cpu_to_be64(sctx->count << 3);
292 
293  /* Pad out to 56 mod 64. */
294  index = sctx->count & 0x3f;
295  pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
296  sha256_update(desc, padding, pad_len);
297 
298  /* Append length (before padding) */
299  sha256_update(desc, (const u8 *)&bits, sizeof(bits));
300 
301  /* Store state in digest */
302  for (i = 0; i < 8; i++)
303  dst[i] = cpu_to_be32(sctx->state[i]);
304 
305  /* Zeroize sensitive information. */
306  memset(sctx, 0, sizeof(*sctx));
307 
308  return 0;
309 }
310 
311 static int sha224_final(struct shash_desc *desc, u8 *hash)
312 {
313  u8 D[SHA256_DIGEST_SIZE];
314 
315  sha256_final(desc, D);
316 
317  memcpy(hash, D, SHA224_DIGEST_SIZE);
318  memset(D, 0, SHA256_DIGEST_SIZE);
319 
320  return 0;
321 }
322 
323 static int sha256_export(struct shash_desc *desc, void *out)
324 {
325  struct sha256_state *sctx = shash_desc_ctx(desc);
326 
327  memcpy(out, sctx, sizeof(*sctx));
328  return 0;
329 }
330 
331 static int sha256_import(struct shash_desc *desc, const void *in)
332 {
333  struct sha256_state *sctx = shash_desc_ctx(desc);
334 
335  memcpy(sctx, in, sizeof(*sctx));
336  return 0;
337 }
338 
339 static struct shash_alg sha256_algs[2] = { {
340  .digestsize = SHA256_DIGEST_SIZE,
341  .init = sha256_init,
342  .update = sha256_update,
343  .final = sha256_final,
344  .export = sha256_export,
345  .import = sha256_import,
346  .descsize = sizeof(struct sha256_state),
347  .statesize = sizeof(struct sha256_state),
348  .base = {
349  .cra_name = "sha256",
350  .cra_driver_name= "sha256-generic",
351  .cra_flags = CRYPTO_ALG_TYPE_SHASH,
352  .cra_blocksize = SHA256_BLOCK_SIZE,
353  .cra_module = THIS_MODULE,
354  }
355 }, {
356  .digestsize = SHA224_DIGEST_SIZE,
357  .init = sha224_init,
358  .update = sha256_update,
359  .final = sha224_final,
360  .descsize = sizeof(struct sha256_state),
361  .base = {
362  .cra_name = "sha224",
363  .cra_driver_name= "sha224-generic",
364  .cra_flags = CRYPTO_ALG_TYPE_SHASH,
365  .cra_blocksize = SHA224_BLOCK_SIZE,
366  .cra_module = THIS_MODULE,
367  }
368 } };
369 
370 static int __init sha256_generic_mod_init(void)
371 {
372  return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
373 }
374 
375 static void __exit sha256_generic_mod_fini(void)
376 {
377  crypto_unregister_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
378 }
379 
380 module_init(sha256_generic_mod_init);
381 module_exit(sha256_generic_mod_fini);
382 
383 MODULE_LICENSE("GPL");
384 MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
385 
386 MODULE_ALIAS("sha224");
387 MODULE_ALIAS("sha256");
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