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
Ch(u32 x,u32 y,u32 z)29 static inline u32 Ch(u32 x, u32 y, u32 z)
30 {
31 return z ^ (x & (y ^ z));
32 }
33
Maj(u32 x,u32 y,u32 z)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
LOAD_OP(int I,u32 * W,const u8 * input)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
BLEND_OP(int I,u32 * W)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
sha256_transform(u32 * state,const u8 * input)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
sha224_init(struct shash_desc * desc)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
sha256_init(struct shash_desc * desc)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
crypto_sha256_update(struct shash_desc * desc,const u8 * data,unsigned int len)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
sha256_final(struct shash_desc * desc,u8 * out)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
sha224_final(struct shash_desc * desc,u8 * hash)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
sha256_export(struct shash_desc * desc,void * out)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
sha256_import(struct shash_desc * desc,const void * in)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
sha256_generic_mod_init(void)371 static int __init sha256_generic_mod_init(void)
372 {
373 return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
374 }
375
sha256_generic_mod_fini(void)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