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[/] [test_project/] [trunk/] [linux_sd_driver/] [crypto/] [sha256_generic.c] - Blame information for rev 62

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1 62 marcus.erl
/*
2
 * Cryptographic API.
3
 *
4
 * SHA-256, as specified in
5
 * http://csrc.nist.gov/cryptval/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
 *
13
 * This program is free software; you can redistribute it and/or modify it
14
 * under the terms of the GNU General Public License as published by the Free
15
 * Software Foundation; either version 2 of the License, or (at your option)
16
 * any later version.
17
 *
18
 */
19
#include <linux/init.h>
20
#include <linux/module.h>
21
#include <linux/mm.h>
22
#include <linux/crypto.h>
23
#include <linux/types.h>
24
#include <crypto/sha.h>
25
#include <asm/byteorder.h>
26
 
27
struct sha256_ctx {
28
        u32 count[2];
29
        u32 state[8];
30
        u8 buf[128];
31
};
32
 
33
static inline u32 Ch(u32 x, u32 y, u32 z)
34
{
35
        return z ^ (x & (y ^ z));
36
}
37
 
38
static inline u32 Maj(u32 x, u32 y, u32 z)
39
{
40
        return (x & y) | (z & (x | y));
41
}
42
 
43
#define e0(x)       (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22))
44
#define e1(x)       (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25))
45
#define s0(x)       (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3))
46
#define s1(x)       (ror32(x,17) ^ ror32(x,19) ^ (x >> 10))
47
 
48
static inline void LOAD_OP(int I, u32 *W, const u8 *input)
49
{
50
        W[I] = __be32_to_cpu( ((__be32*)(input))[I] );
51
}
52
 
53
static inline void BLEND_OP(int I, u32 *W)
54
{
55
        W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
56
}
57
 
58
static void sha256_transform(u32 *state, const u8 *input)
59
{
60
        u32 a, b, c, d, e, f, g, h, t1, t2;
61
        u32 W[64];
62
        int i;
63
 
64
        /* load the input */
65
        for (i = 0; i < 16; i++)
66
                LOAD_OP(i, W, input);
67
 
68
        /* now blend */
69
        for (i = 16; i < 64; i++)
70
                BLEND_OP(i, W);
71
 
72
        /* load the state into our registers */
73
        a=state[0];  b=state[1];  c=state[2];  d=state[3];
74
        e=state[4];  f=state[5];  g=state[6];  h=state[7];
75
 
76
        /* now iterate */
77
        t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0];
78
        t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
79
        t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1];
80
        t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
81
        t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2];
82
        t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
83
        t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3];
84
        t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
85
        t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4];
86
        t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
87
        t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5];
88
        t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
89
        t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6];
90
        t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
91
        t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7];
92
        t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
93
 
94
        t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8];
95
        t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
96
        t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9];
97
        t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
98
        t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10];
99
        t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
100
        t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11];
101
        t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
102
        t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12];
103
        t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
104
        t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13];
105
        t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
106
        t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14];
107
        t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
108
        t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15];
109
        t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
110
 
111
        t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16];
112
        t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
113
        t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17];
114
        t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
115
        t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18];
116
        t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
117
        t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19];
118
        t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
119
        t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20];
120
        t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
121
        t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21];
122
        t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
123
        t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22];
124
        t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
125
        t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23];
126
        t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
127
 
128
        t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24];
129
        t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
130
        t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25];
131
        t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
132
        t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26];
133
        t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
134
        t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27];
135
        t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
136
        t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28];
137
        t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
138
        t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29];
139
        t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
140
        t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30];
141
        t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
142
        t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31];
143
        t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
144
 
145
        t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32];
146
        t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
147
        t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33];
148
        t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
149
        t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34];
150
        t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
151
        t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35];
152
        t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
153
        t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36];
154
        t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
155
        t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37];
156
        t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
157
        t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38];
158
        t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
159
        t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39];
160
        t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
161
 
162
        t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40];
163
        t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
164
        t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41];
165
        t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
166
        t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42];
167
        t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
168
        t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43];
169
        t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
170
        t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44];
171
        t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
172
        t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45];
173
        t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
174
        t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46];
175
        t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
176
        t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47];
177
        t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
178
 
179
        t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48];
180
        t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
181
        t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49];
182
        t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
183
        t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50];
184
        t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
185
        t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51];
186
        t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
187
        t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52];
188
        t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
189
        t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53];
190
        t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
191
        t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54];
192
        t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
193
        t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55];
194
        t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
195
 
196
        t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56];
197
        t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
198
        t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57];
199
        t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
200
        t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58];
201
        t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
202
        t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59];
203
        t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
204
        t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60];
205
        t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
206
        t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61];
207
        t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
208
        t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62];
209
        t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
210
        t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63];
211
        t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
212
 
213
        state[0] += a; state[1] += b; state[2] += c; state[3] += d;
214
        state[4] += e; state[5] += f; state[6] += g; state[7] += h;
215
 
216
        /* clear any sensitive info... */
217
        a = b = c = d = e = f = g = h = t1 = t2 = 0;
218
        memset(W, 0, 64 * sizeof(u32));
219
}
220
 
221
static void sha256_init(struct crypto_tfm *tfm)
222
{
223
        struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
224
        sctx->state[0] = SHA256_H0;
225
        sctx->state[1] = SHA256_H1;
226
        sctx->state[2] = SHA256_H2;
227
        sctx->state[3] = SHA256_H3;
228
        sctx->state[4] = SHA256_H4;
229
        sctx->state[5] = SHA256_H5;
230
        sctx->state[6] = SHA256_H6;
231
        sctx->state[7] = SHA256_H7;
232
        sctx->count[0] = sctx->count[1] = 0;
233
}
234
 
235
static void sha256_update(struct crypto_tfm *tfm, const u8 *data,
236
                          unsigned int len)
237
{
238
        struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
239
        unsigned int i, index, part_len;
240
 
241
        /* Compute number of bytes mod 128 */
242
        index = (unsigned int)((sctx->count[0] >> 3) & 0x3f);
243
 
244
        /* Update number of bits */
245
        if ((sctx->count[0] += (len << 3)) < (len << 3)) {
246
                sctx->count[1]++;
247
                sctx->count[1] += (len >> 29);
248
        }
249
 
250
        part_len = 64 - index;
251
 
252
        /* Transform as many times as possible. */
253
        if (len >= part_len) {
254
                memcpy(&sctx->buf[index], data, part_len);
255
                sha256_transform(sctx->state, sctx->buf);
256
 
257
                for (i = part_len; i + 63 < len; i += 64)
258
                        sha256_transform(sctx->state, &data[i]);
259
                index = 0;
260
        } else {
261
                i = 0;
262
        }
263
 
264
        /* Buffer remaining input */
265
        memcpy(&sctx->buf[index], &data[i], len-i);
266
}
267
 
268
static void sha256_final(struct crypto_tfm *tfm, u8 *out)
269
{
270
        struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
271
        __be32 *dst = (__be32 *)out;
272
        __be32 bits[2];
273
        unsigned int index, pad_len;
274
        int i;
275
        static const u8 padding[64] = { 0x80, };
276
 
277
        /* Save number of bits */
278
        bits[1] = cpu_to_be32(sctx->count[0]);
279
        bits[0] = cpu_to_be32(sctx->count[1]);
280
 
281
        /* Pad out to 56 mod 64. */
282
        index = (sctx->count[0] >> 3) & 0x3f;
283
        pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
284
        sha256_update(tfm, padding, pad_len);
285
 
286
        /* Append length (before padding) */
287
        sha256_update(tfm, (const u8 *)bits, sizeof(bits));
288
 
289
        /* Store state in digest */
290
        for (i = 0; i < 8; i++)
291
                dst[i] = cpu_to_be32(sctx->state[i]);
292
 
293
        /* Zeroize sensitive information. */
294
        memset(sctx, 0, sizeof(*sctx));
295
}
296
 
297
 
298
static struct crypto_alg alg = {
299
        .cra_name       =       "sha256",
300
        .cra_driver_name=       "sha256-generic",
301
        .cra_flags      =       CRYPTO_ALG_TYPE_DIGEST,
302
        .cra_blocksize  =       SHA256_BLOCK_SIZE,
303
        .cra_ctxsize    =       sizeof(struct sha256_ctx),
304
        .cra_module     =       THIS_MODULE,
305
        .cra_alignmask  =       3,
306
        .cra_list       =       LIST_HEAD_INIT(alg.cra_list),
307
        .cra_u          =       { .digest = {
308
        .dia_digestsize =       SHA256_DIGEST_SIZE,
309
        .dia_init       =       sha256_init,
310
        .dia_update     =       sha256_update,
311
        .dia_final      =       sha256_final } }
312
};
313
 
314
static int __init init(void)
315
{
316
        return crypto_register_alg(&alg);
317
}
318
 
319
static void __exit fini(void)
320
{
321
        crypto_unregister_alg(&alg);
322
}
323
 
324
module_init(init);
325
module_exit(fini);
326
 
327
MODULE_LICENSE("GPL");
328
MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");
329
 
330
MODULE_ALIAS("sha256");

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