Root/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 <asm/byteorder.h>
27#include <asm/unaligned.h>
28
29static inline u32 Ch(u32 x, u32 y, u32 z)
30{
31    return z ^ (x & (y ^ z));
32}
33
34static 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
44static inline void LOAD_OP(int I, u32 *W, const u8 *input)
45{
46    W[I] = get_unaligned_be32((__u32 *)input + I);
47}
48
49static 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
54static 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
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
249int 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}
280EXPORT_SYMBOL(crypto_sha256_update);
281
282static 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
312static 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
324static 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
332static 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
340static 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
371static int __init sha256_generic_mod_init(void)
372{
373    return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
374}
375
376static void __exit sha256_generic_mod_fini(void)
377{
378    crypto_unregister_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
379}
380
381module_init(sha256_generic_mod_init);
382module_exit(sha256_generic_mod_fini);
383
384MODULE_LICENSE("GPL");
385MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
386
387MODULE_ALIAS("sha224");
388MODULE_ALIAS("sha256");
389

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