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
28static inline u32 Ch(u32 x, u32 y, u32 z)
29{
30	return z ^ (x & (y ^ z));
31}
32
33static 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
43static inline void LOAD_OP(int I, u32 *W, const u8 *input)
44{
45	W[I] = __be32_to_cpu( ((__be32*)(input))[I] );
46}
47
48static 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
53static 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
217static 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
233static 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
249static 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
281static 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
311static 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
323static 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
331static 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
339static struct shash_alg sha256 = {
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
357static struct shash_alg sha224 = {
358	.digestsize	=	SHA224_DIGEST_SIZE,
359	.init		=	sha224_init,
360	.update		=	sha256_update,
361	.final		=	sha224_final,
362	.descsize	=	sizeof(struct sha256_state),
363	.base		=	{
364		.cra_name	=	"sha224",
365		.cra_driver_name=	"sha224-generic",
366		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
367		.cra_blocksize	=	SHA224_BLOCK_SIZE,
368		.cra_module	=	THIS_MODULE,
369	}
370};
371
372static int __init sha256_generic_mod_init(void)
373{
374	int ret = 0;
375
376	ret = crypto_register_shash(&sha224);
377
378	if (ret < 0)
379		return ret;
380
381	ret = crypto_register_shash(&sha256);
382
383	if (ret < 0)
384		crypto_unregister_shash(&sha224);
385
386	return ret;
387}
388
389static void __exit sha256_generic_mod_fini(void)
390{
391	crypto_unregister_shash(&sha224);
392	crypto_unregister_shash(&sha256);
393}
394
395module_init(sha256_generic_mod_init);
396module_exit(sha256_generic_mod_fini);
397
398MODULE_LICENSE("GPL");
399MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
400
401MODULE_ALIAS("sha224");
402MODULE_ALIAS("sha256");
403