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-rw-r--r--crypto/sha256_generic.c342
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diff --git a/crypto/sha256_generic.c b/crypto/sha256_generic.c
new file mode 100644
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+++ b/crypto/sha256_generic.c
@@ -0,0 +1,342 @@
1/*
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 <asm/scatterlist.h>
25#include <asm/byteorder.h>
26
27#define SHA256_DIGEST_SIZE 32
28#define SHA256_HMAC_BLOCK_SIZE 64
29
30struct sha256_ctx {
31 u32 count[2];
32 u32 state[8];
33 u8 buf[128];
34};
35
36static inline u32 Ch(u32 x, u32 y, u32 z)
37{
38 return z ^ (x & (y ^ z));
39}
40
41static inline u32 Maj(u32 x, u32 y, u32 z)
42{
43 return (x & y) | (z & (x | y));
44}
45
46#define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22))
47#define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25))
48#define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3))
49#define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10))
50
51#define H0 0x6a09e667
52#define H1 0xbb67ae85
53#define H2 0x3c6ef372
54#define H3 0xa54ff53a
55#define H4 0x510e527f
56#define H5 0x9b05688c
57#define H6 0x1f83d9ab
58#define H7 0x5be0cd19
59
60static inline void LOAD_OP(int I, u32 *W, const u8 *input)
61{
62 W[I] = __be32_to_cpu( ((__be32*)(input))[I] );
63}
64
65static inline void BLEND_OP(int I, u32 *W)
66{
67 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
68}
69
70static void sha256_transform(u32 *state, const u8 *input)
71{
72 u32 a, b, c, d, e, f, g, h, t1, t2;
73 u32 W[64];
74 int i;
75
76 /* load the input */
77 for (i = 0; i < 16; i++)
78 LOAD_OP(i, W, input);
79
80 /* now blend */
81 for (i = 16; i < 64; i++)
82 BLEND_OP(i, W);
83
84 /* load the state into our registers */
85 a=state[0]; b=state[1]; c=state[2]; d=state[3];
86 e=state[4]; f=state[5]; g=state[6]; h=state[7];
87
88 /* now iterate */
89 t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0];
90 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
91 t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1];
92 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
93 t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2];
94 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
95 t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3];
96 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
97 t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4];
98 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
99 t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5];
100 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
101 t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6];
102 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
103 t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7];
104 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
105
106 t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8];
107 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
108 t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9];
109 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
110 t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10];
111 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
112 t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11];
113 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
114 t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12];
115 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
116 t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13];
117 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
118 t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14];
119 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
120 t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15];
121 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
122
123 t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16];
124 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
125 t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17];
126 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
127 t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18];
128 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
129 t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19];
130 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
131 t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20];
132 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
133 t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21];
134 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
135 t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22];
136 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
137 t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23];
138 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
139
140 t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24];
141 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
142 t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25];
143 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
144 t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26];
145 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
146 t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27];
147 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
148 t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28];
149 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
150 t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29];
151 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
152 t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30];
153 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
154 t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31];
155 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
156
157 t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32];
158 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
159 t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33];
160 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
161 t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34];
162 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
163 t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35];
164 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
165 t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36];
166 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
167 t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37];
168 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
169 t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38];
170 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
171 t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39];
172 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
173
174 t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40];
175 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
176 t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41];
177 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
178 t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42];
179 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
180 t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43];
181 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
182 t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44];
183 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
184 t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45];
185 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
186 t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46];
187 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
188 t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47];
189 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
190
191 t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48];
192 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
193 t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49];
194 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
195 t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50];
196 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
197 t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51];
198 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
199 t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52];
200 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
201 t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53];
202 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
203 t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54];
204 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
205 t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55];
206 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
207
208 t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56];
209 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
210 t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57];
211 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
212 t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58];
213 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
214 t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59];
215 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
216 t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60];
217 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
218 t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61];
219 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
220 t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62];
221 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
222 t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63];
223 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
224
225 state[0] += a; state[1] += b; state[2] += c; state[3] += d;
226 state[4] += e; state[5] += f; state[6] += g; state[7] += h;
227
228 /* clear any sensitive info... */
229 a = b = c = d = e = f = g = h = t1 = t2 = 0;
230 memset(W, 0, 64 * sizeof(u32));
231}
232
233static void sha256_init(struct crypto_tfm *tfm)
234{
235 struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
236 sctx->state[0] = H0;
237 sctx->state[1] = H1;
238 sctx->state[2] = H2;
239 sctx->state[3] = H3;
240 sctx->state[4] = H4;
241 sctx->state[5] = H5;
242 sctx->state[6] = H6;
243 sctx->state[7] = H7;
244 sctx->count[0] = sctx->count[1] = 0;
245}
246
247static void sha256_update(struct crypto_tfm *tfm, const u8 *data,
248 unsigned int len)
249{
250 struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
251 unsigned int i, index, part_len;
252
253 /* Compute number of bytes mod 128 */
254 index = (unsigned int)((sctx->count[0] >> 3) & 0x3f);
255
256 /* Update number of bits */
257 if ((sctx->count[0] += (len << 3)) < (len << 3)) {
258 sctx->count[1]++;
259 sctx->count[1] += (len >> 29);
260 }
261
262 part_len = 64 - index;
263
264 /* Transform as many times as possible. */
265 if (len >= part_len) {
266 memcpy(&sctx->buf[index], data, part_len);
267 sha256_transform(sctx->state, sctx->buf);
268
269 for (i = part_len; i + 63 < len; i += 64)
270 sha256_transform(sctx->state, &data[i]);
271 index = 0;
272 } else {
273 i = 0;
274 }
275
276 /* Buffer remaining input */
277 memcpy(&sctx->buf[index], &data[i], len-i);
278}
279
280static void sha256_final(struct crypto_tfm *tfm, u8 *out)
281{
282 struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
283 __be32 *dst = (__be32 *)out;
284 __be32 bits[2];
285 unsigned int index, pad_len;
286 int i;
287 static const u8 padding[64] = { 0x80, };
288
289 /* Save number of bits */
290 bits[1] = cpu_to_be32(sctx->count[0]);
291 bits[0] = cpu_to_be32(sctx->count[1]);
292
293 /* Pad out to 56 mod 64. */
294 index = (sctx->count[0] >> 3) & 0x3f;
295 pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
296 sha256_update(tfm, padding, pad_len);
297
298 /* Append length (before padding) */
299 sha256_update(tfm, (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
309
310static struct crypto_alg alg = {
311 .cra_name = "sha256",
312 .cra_driver_name= "sha256-generic",
313 .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
314 .cra_blocksize = SHA256_HMAC_BLOCK_SIZE,
315 .cra_ctxsize = sizeof(struct sha256_ctx),
316 .cra_module = THIS_MODULE,
317 .cra_alignmask = 3,
318 .cra_list = LIST_HEAD_INIT(alg.cra_list),
319 .cra_u = { .digest = {
320 .dia_digestsize = SHA256_DIGEST_SIZE,
321 .dia_init = sha256_init,
322 .dia_update = sha256_update,
323 .dia_final = sha256_final } }
324};
325
326static int __init init(void)
327{
328 return crypto_register_alg(&alg);
329}
330
331static void __exit fini(void)
332{
333 crypto_unregister_alg(&alg);
334}
335
336module_init(init);
337module_exit(fini);
338
339MODULE_LICENSE("GPL");
340MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");
341
342MODULE_ALIAS("sha256");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 19:37:38 -0500