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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
27struct sha256_ctx {
28 u32 count[2];
29 u32 state[8];
30 u8 buf[128];
31};
32
33static inline u32 Ch(u32 x, u32 y, u32 z)
34{
35 return z ^ (x & (y ^ z));
36}
37
38static 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
48static inline void LOAD_OP(int I, u32 *W, const u8 *input)
49{
50 W[I] = __be32_to_cpu( ((__be32*)(input))[I] );
51}
52
53static 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
58static 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
65 for (i = 0; i < 16; i++)
66 LOAD_OP(i, W, input);
67
68
69 for (i = 16; i < 64; i++)
70 BLEND_OP(i, W);
71
72
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
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
217 a = b = c = d = e = f = g = h = t1 = t2 = 0;
218 memset(W, 0, 64 * sizeof(u32));
219}
220
221static 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
235static 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
242 index = (unsigned int)((sctx->count[0] >> 3) & 0x3f);
243
244
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
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
265 memcpy(&sctx->buf[index], &data[i], len-i);
266}
267
268static 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
278 bits[1] = cpu_to_be32(sctx->count[0]);
279 bits[0] = cpu_to_be32(sctx->count[1]);
280
281
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
287 sha256_update(tfm, (const u8 *)bits, sizeof(bits));
288
289
290 for (i = 0; i < 8; i++)
291 dst[i] = cpu_to_be32(sctx->state[i]);
292
293
294 memset(sctx, 0, sizeof(*sctx));
295}
296
297
298static 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
314static int __init init(void)
315{
316 return crypto_register_alg(&alg);
317}
318
319static void __exit fini(void)
320{
321 crypto_unregister_alg(&alg);
322}
323
324module_init(init);
325module_exit(fini);
326
327MODULE_LICENSE("GPL");
328MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");
329
330MODULE_ALIAS("sha256");
331
