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-rw-r--r--crypto/sha256.c349
1 files changed, 349 insertions, 0 deletions
diff --git a/crypto/sha256.c b/crypto/sha256.c
new file mode 100644
index 000000000000..c78da50a9b7a
--- /dev/null
+++ b/crypto/sha256.c
@@ -0,0 +1,349 @@
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 <asm/scatterlist.h>
24#include <asm/byteorder.h>
25
26#define SHA256_DIGEST_SIZE 32
27#define SHA256_HMAC_BLOCK_SIZE 64
28
29struct sha256_ctx {
30 u32 count[2];
31 u32 state[8];
32 u8 buf[128];
33};
34
35static inline u32 Ch(u32 x, u32 y, u32 z)
36{
37 return z ^ (x & (y ^ z));
38}
39
40static inline u32 Maj(u32 x, u32 y, u32 z)
41{
42 return (x & y) | (z & (x | y));
43}
44
45#define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22))
46#define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25))
47#define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3))
48#define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10))
49
50#define H0 0x6a09e667
51#define H1 0xbb67ae85
52#define H2 0x3c6ef372
53#define H3 0xa54ff53a
54#define H4 0x510e527f
55#define H5 0x9b05688c
56#define H6 0x1f83d9ab
57#define H7 0x5be0cd19
58
59static inline void LOAD_OP(int I, u32 *W, const u8 *input)
60{
61 W[I] = __be32_to_cpu( ((__be32*)(input))[I] );
62}
63
64static inline void BLEND_OP(int I, u32 *W)
65{
66 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
67}
68
69static void sha256_transform(u32 *state, const u8 *input)
70{
71 u32 a, b, c, d, e, f, g, h, t1, t2;
72 u32 W[64];
73 int i;
74
75 /* load the input */
76 for (i = 0; i < 16; i++)
77 LOAD_OP(i, W, input);
78
79 /* now blend */
80 for (i = 16; i < 64; i++)
81 BLEND_OP(i, W);
82
83 /* load the state into our registers */
84 a=state[0]; b=state[1]; c=state[2]; d=state[3];
85 e=state[4]; f=state[5]; g=state[6]; h=state[7];
86
87 /* now iterate */
88 t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0];
89 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
90 t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1];
91 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
92 t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2];
93 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
94 t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3];
95 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
96 t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4];
97 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
98 t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5];
99 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
100 t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6];
101 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
102 t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7];
103 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
104
105 t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8];
106 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
107 t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9];
108 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
109 t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10];
110 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
111 t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11];
112 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
113 t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12];
114 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
115 t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13];
116 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
117 t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14];
118 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
119 t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15];
120 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
121
122 t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16];
123 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
124 t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17];
125 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
126 t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18];
127 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
128 t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19];
129 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
130 t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20];
131 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
132 t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21];
133 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
134 t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22];
135 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
136 t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23];
137 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
138
139 t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24];
140 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
141 t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25];
142 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
143 t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26];
144 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
145 t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27];
146 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
147 t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28];
148 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
149 t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29];
150 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
151 t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30];
152 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
153 t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31];
154 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
155
156 t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32];
157 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
158 t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33];
159 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
160 t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34];
161 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
162 t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35];
163 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
164 t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36];
165 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
166 t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37];
167 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
168 t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38];
169 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
170 t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39];
171 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
172
173 t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40];
174 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
175 t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41];
176 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
177 t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42];
178 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
179 t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43];
180 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
181 t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44];
182 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
183 t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45];
184 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
185 t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46];
186 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
187 t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47];
188 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
189
190 t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48];
191 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
192 t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49];
193 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
194 t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50];
195 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
196 t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51];
197 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
198 t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52];
199 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
200 t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53];
201 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
202 t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54];
203 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
204 t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55];
205 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
206
207 t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56];
208 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
209 t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57];
210 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
211 t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58];
212 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
213 t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59];
214 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
215 t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60];
216 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
217 t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61];
218 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
219 t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62];
220 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
221 t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63];
222 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
223
224 state[0] += a; state[1] += b; state[2] += c; state[3] += d;
225 state[4] += e; state[5] += f; state[6] += g; state[7] += h;
226
227 /* clear any sensitive info... */
228 a = b = c = d = e = f = g = h = t1 = t2 = 0;
229 memset(W, 0, 64 * sizeof(u32));
230}
231
232static void sha256_init(void *ctx)
233{
234 struct sha256_ctx *sctx = ctx;
235 sctx->state[0] = H0;
236 sctx->state[1] = H1;
237 sctx->state[2] = H2;
238 sctx->state[3] = H3;
239 sctx->state[4] = H4;
240 sctx->state[5] = H5;
241 sctx->state[6] = H6;
242 sctx->state[7] = H7;
243 sctx->count[0] = sctx->count[1] = 0;
244 memset(sctx->buf, 0, sizeof(sctx->buf));
245}
246
247static void sha256_update(void *ctx, const u8 *data, unsigned int len)
248{
249 struct sha256_ctx *sctx = ctx;
250 unsigned int i, index, part_len;
251
252 /* Compute number of bytes mod 128 */
253 index = (unsigned int)((sctx->count[0] >> 3) & 0x3f);
254
255 /* Update number of bits */
256 if ((sctx->count[0] += (len << 3)) < (len << 3)) {
257 sctx->count[1]++;
258 sctx->count[1] += (len >> 29);
259 }
260
261 part_len = 64 - index;
262
263 /* Transform as many times as possible. */
264 if (len >= part_len) {
265 memcpy(&sctx->buf[index], data, part_len);
266 sha256_transform(sctx->state, sctx->buf);
267
268 for (i = part_len; i + 63 < len; i += 64)
269 sha256_transform(sctx->state, &data[i]);
270 index = 0;
271 } else {
272 i = 0;
273 }
274
275 /* Buffer remaining input */
276 memcpy(&sctx->buf[index], &data[i], len-i);
277}
278
279static void sha256_final(void* ctx, u8 *out)
280{
281 struct sha256_ctx *sctx = ctx;
282 u8 bits[8];
283 unsigned int index, pad_len, t;
284 int i, j;
285 static const u8 padding[64] = { 0x80, };
286
287 /* Save number of bits */
288 t = sctx->count[0];
289 bits[7] = t; t >>= 8;
290 bits[6] = t; t >>= 8;
291 bits[5] = t; t >>= 8;
292 bits[4] = t;
293 t = sctx->count[1];
294 bits[3] = t; t >>= 8;
295 bits[2] = t; t >>= 8;
296 bits[1] = t; t >>= 8;
297 bits[0] = t;
298
299 /* Pad out to 56 mod 64. */
300 index = (sctx->count[0] >> 3) & 0x3f;
301 pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
302 sha256_update(sctx, padding, pad_len);
303
304 /* Append length (before padding) */
305 sha256_update(sctx, bits, 8);
306
307 /* Store state in digest */
308 for (i = j = 0; i < 8; i++, j += 4) {
309 t = sctx->state[i];
310 out[j+3] = t; t >>= 8;
311 out[j+2] = t; t >>= 8;
312 out[j+1] = t; t >>= 8;
313 out[j ] = t;
314 }
315
316 /* Zeroize sensitive information. */
317 memset(sctx, 0, sizeof(*sctx));
318}
319
320
321static struct crypto_alg alg = {
322 .cra_name = "sha256",
323 .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
324 .cra_blocksize = SHA256_HMAC_BLOCK_SIZE,
325 .cra_ctxsize = sizeof(struct sha256_ctx),
326 .cra_module = THIS_MODULE,
327 .cra_list = LIST_HEAD_INIT(alg.cra_list),
328 .cra_u = { .digest = {
329 .dia_digestsize = SHA256_DIGEST_SIZE,
330 .dia_init = sha256_init,
331 .dia_update = sha256_update,
332 .dia_final = sha256_final } }
333};
334
335static int __init init(void)
336{
337 return crypto_register_alg(&alg);
338}
339
340static void __exit fini(void)
341{
342 crypto_unregister_alg(&alg);
343}
344
345module_init(init);
346module_exit(fini);
347
348MODULE_LICENSE("GPL");
349MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-27 10:49:35 -0500