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20#include <linux/init.h>
21#include <linux/module.h>
22#include <linux/mm.h>
23#include <linux/crypto.h>
24#include <linux/types.h>
25#include <crypto/sha.h>
26#include <asm/byteorder.h>
27
28struct sha256_ctx {
29 u32 count[2];
30 u32 state[8];
31 u8 buf[128];
32};
33
34static inline u32 Ch(u32 x, u32 y, u32 z)
35{
36 return z ^ (x & (y ^ z));
37}
38
39static inline u32 Maj(u32 x, u32 y, u32 z)
40{
41 return (x & y) | (z & (x | y));
42}
43
44#define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22))
45#define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25))
46#define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3))
47#define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10))
48
49static inline void LOAD_OP(int I, u32 *W, const u8 *input)
50{
51 W[I] = __be32_to_cpu( ((__be32*)(input))[I] );
52}
53
54static inline void BLEND_OP(int I, u32 *W)
55{
56 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
57}
58
59static void sha256_transform(u32 *state, const u8 *input)
60{
61 u32 a, b, c, d, e, f, g, h, t1, t2;
62 u32 W[64];
63 int i;
64
65
66 for (i = 0; i < 16; i++)
67 LOAD_OP(i, W, input);
68
69
70 for (i = 16; i < 64; i++)
71 BLEND_OP(i, W);
72
73
74 a=state[0]; b=state[1]; c=state[2]; d=state[3];
75 e=state[4]; f=state[5]; g=state[6]; h=state[7];
76
77
78 t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0];
79 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
80 t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1];
81 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
82 t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2];
83 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
84 t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3];
85 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
86 t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4];
87 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
88 t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5];
89 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
90 t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6];
91 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
92 t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7];
93 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
94
95 t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8];
96 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
97 t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9];
98 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
99 t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10];
100 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
101 t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11];
102 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
103 t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12];
104 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
105 t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13];
106 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
107 t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14];
108 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
109 t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15];
110 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
111
112 t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16];
113 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
114 t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17];
115 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
116 t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18];
117 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
118 t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19];
119 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
120 t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20];
121 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
122 t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21];
123 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
124 t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22];
125 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
126 t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23];
127 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
128
129 t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24];
130 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
131 t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25];
132 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
133 t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26];
134 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
135 t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27];
136 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
137 t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28];
138 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
139 t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29];
140 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
141 t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30];
142 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
143 t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31];
144 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
145
146 t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32];
147 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
148 t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33];
149 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
150 t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34];
151 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
152 t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35];
153 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
154 t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36];
155 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
156 t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37];
157 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
158 t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38];
159 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
160 t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39];
161 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
162
163 t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40];
164 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
165 t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41];
166 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
167 t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42];
168 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
169 t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43];
170 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
171 t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44];
172 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
173 t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45];
174 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
175 t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46];
176 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
177 t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47];
178 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
179
180 t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48];
181 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
182 t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49];
183 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
184 t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50];
185 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
186 t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51];
187 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
188 t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52];
189 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
190 t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53];
191 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
192 t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54];
193 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
194 t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55];
195 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
196
197 t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56];
198 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
199 t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57];
200 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
201 t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58];
202 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
203 t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59];
204 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
205 t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60];
206 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
207 t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61];
208 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
209 t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62];
210 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
211 t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63];
212 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
213
214 state[0] += a; state[1] += b; state[2] += c; state[3] += d;
215 state[4] += e; state[5] += f; state[6] += g; state[7] += h;
216
217
218 a = b = c = d = e = f = g = h = t1 = t2 = 0;
219 memset(W, 0, 64 * sizeof(u32));
220}
221
222
223static void sha224_init(struct crypto_tfm *tfm)
224{
225 struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
226 sctx->state[0] = SHA224_H0;
227 sctx->state[1] = SHA224_H1;
228 sctx->state[2] = SHA224_H2;
229 sctx->state[3] = SHA224_H3;
230 sctx->state[4] = SHA224_H4;
231 sctx->state[5] = SHA224_H5;
232 sctx->state[6] = SHA224_H6;
233 sctx->state[7] = SHA224_H7;
234 sctx->count[0] = 0;
235 sctx->count[1] = 0;
236}
237
238static void sha256_init(struct crypto_tfm *tfm)
239{
240 struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
241 sctx->state[0] = SHA256_H0;
242 sctx->state[1] = SHA256_H1;
243 sctx->state[2] = SHA256_H2;
244 sctx->state[3] = SHA256_H3;
245 sctx->state[4] = SHA256_H4;
246 sctx->state[5] = SHA256_H5;
247 sctx->state[6] = SHA256_H6;
248 sctx->state[7] = SHA256_H7;
249 sctx->count[0] = sctx->count[1] = 0;
250}
251
252static void sha256_update(struct crypto_tfm *tfm, const u8 *data,
253 unsigned int len)
254{
255 struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
256 unsigned int i, index, part_len;
257
258
259 index = (unsigned int)((sctx->count[0] >> 3) & 0x3f);
260
261
262 if ((sctx->count[0] += (len << 3)) < (len << 3)) {
263 sctx->count[1]++;
264 sctx->count[1] += (len >> 29);
265 }
266
267 part_len = 64 - index;
268
269
270 if (len >= part_len) {
271 memcpy(&sctx->buf[index], data, part_len);
272 sha256_transform(sctx->state, sctx->buf);
273
274 for (i = part_len; i + 63 < len; i += 64)
275 sha256_transform(sctx->state, &data[i]);
276 index = 0;
277 } else {
278 i = 0;
279 }
280
281
282 memcpy(&sctx->buf[index], &data[i], len-i);
283}
284
285static void sha256_final(struct crypto_tfm *tfm, u8 *out)
286{
287 struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
288 __be32 *dst = (__be32 *)out;
289 __be32 bits[2];
290 unsigned int index, pad_len;
291 int i;
292 static const u8 padding[64] = { 0x80, };
293
294
295 bits[1] = cpu_to_be32(sctx->count[0]);
296 bits[0] = cpu_to_be32(sctx->count[1]);
297
298
299 index = (sctx->count[0] >> 3) & 0x3f;
300 pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
301 sha256_update(tfm, padding, pad_len);
302
303
304 sha256_update(tfm, (const u8 *)bits, sizeof(bits));
305
306
307 for (i = 0; i < 8; i++)
308 dst[i] = cpu_to_be32(sctx->state[i]);
309
310
311 memset(sctx, 0, sizeof(*sctx));
312}
313
314static void sha224_final(struct crypto_tfm *tfm, u8 *hash)
315{
316 u8 D[SHA256_DIGEST_SIZE];
317
318 sha256_final(tfm, D);
319
320 memcpy(hash, D, SHA224_DIGEST_SIZE);
321 memset(D, 0, SHA256_DIGEST_SIZE);
322}
323
324static struct crypto_alg sha256 = {
325 .cra_name = "sha256",
326 .cra_driver_name= "sha256-generic",
327 .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
328 .cra_blocksize = SHA256_BLOCK_SIZE,
329 .cra_ctxsize = sizeof(struct sha256_ctx),
330 .cra_module = THIS_MODULE,
331 .cra_alignmask = 3,
332 .cra_list = LIST_HEAD_INIT(sha256.cra_list),
333 .cra_u = { .digest = {
334 .dia_digestsize = SHA256_DIGEST_SIZE,
335 .dia_init = sha256_init,
336 .dia_update = sha256_update,
337 .dia_final = sha256_final } }
338};
339
340static struct crypto_alg sha224 = {
341 .cra_name = "sha224",
342 .cra_driver_name = "sha224-generic",
343 .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
344 .cra_blocksize = SHA224_BLOCK_SIZE,
345 .cra_ctxsize = sizeof(struct sha256_ctx),
346 .cra_module = THIS_MODULE,
347 .cra_alignmask = 3,
348 .cra_list = LIST_HEAD_INIT(sha224.cra_list),
349 .cra_u = { .digest = {
350 .dia_digestsize = SHA224_DIGEST_SIZE,
351 .dia_init = sha224_init,
352 .dia_update = sha256_update,
353 .dia_final = sha224_final } }
354};
355
356static int __init sha256_generic_mod_init(void)
357{
358 int ret = 0;
359
360 ret = crypto_register_alg(&sha224);
361
362 if (ret < 0)
363 return ret;
364
365 ret = crypto_register_alg(&sha256);
366
367 if (ret < 0)
368 crypto_unregister_alg(&sha224);
369
370 return ret;
371}
372
373static void __exit sha256_generic_mod_fini(void)
374{
375 crypto_unregister_alg(&sha224);
376 crypto_unregister_alg(&sha256);
377}
378
379module_init(sha256_generic_mod_init);
380module_exit(sha256_generic_mod_fini);
381
382MODULE_LICENSE("GPL");
383MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
384
385MODULE_ALIAS("sha224");
386MODULE_ALIAS("sha256");
387
