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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 <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
45static inline u32 RORu32(u32 x, u32 y)
46{
47 return (x >> y) | (x << (32 - y));
48}
49
50#define e0(x) (RORu32(x, 2) ^ RORu32(x,13) ^ RORu32(x,22))
51#define e1(x) (RORu32(x, 6) ^ RORu32(x,11) ^ RORu32(x,25))
52#define s0(x) (RORu32(x, 7) ^ RORu32(x,18) ^ (x >> 3))
53#define s1(x) (RORu32(x,17) ^ RORu32(x,19) ^ (x >> 10))
54
55#define H0 0x6a09e667
56#define H1 0xbb67ae85
57#define H2 0x3c6ef372
58#define H3 0xa54ff53a
59#define H4 0x510e527f
60#define H5 0x9b05688c
61#define H6 0x1f83d9ab
62#define H7 0x5be0cd19
63
64static inline void LOAD_OP(int I, u32 *W, const u8 *input)
65{
66 u32 t1 = input[(4 * I)] & 0xff;
67
68 t1 <<= 8;
69 t1 |= input[(4 * I) + 1] & 0xff;
70 t1 <<= 8;
71 t1 |= input[(4 * I) + 2] & 0xff;
72 t1 <<= 8;
73 t1 |= input[(4 * I) + 3] & 0xff;
74 W[I] = t1;
75}
76
77static inline void BLEND_OP(int I, u32 *W)
78{
79 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
80}
81
82static void sha256_transform(u32 *state, const u8 *input)
83{
84 u32 a, b, c, d, e, f, g, h, t1, t2;
85 u32 W[64];
86 int i;
87
88
89 for (i = 0; i < 16; i++)
90 LOAD_OP(i, W, input);
91
92
93 for (i = 16; i < 64; i++)
94 BLEND_OP(i, W);
95
96
97 a=state[0]; b=state[1]; c=state[2]; d=state[3];
98 e=state[4]; f=state[5]; g=state[6]; h=state[7];
99
100
101 t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0];
102 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
103 t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1];
104 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
105 t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2];
106 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
107 t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3];
108 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
109 t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4];
110 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
111 t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5];
112 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
113 t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6];
114 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
115 t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7];
116 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
117
118 t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8];
119 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
120 t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9];
121 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
122 t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10];
123 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
124 t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11];
125 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
126 t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12];
127 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
128 t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13];
129 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
130 t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14];
131 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
132 t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15];
133 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
134
135 t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16];
136 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
137 t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17];
138 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
139 t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18];
140 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
141 t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19];
142 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
143 t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20];
144 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
145 t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21];
146 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
147 t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22];
148 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
149 t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23];
150 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
151
152 t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24];
153 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
154 t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25];
155 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
156 t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26];
157 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
158 t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27];
159 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
160 t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28];
161 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
162 t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29];
163 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
164 t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30];
165 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
166 t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31];
167 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
168
169 t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32];
170 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
171 t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33];
172 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
173 t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34];
174 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
175 t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35];
176 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
177 t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36];
178 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
179 t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37];
180 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
181 t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38];
182 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
183 t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39];
184 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
185
186 t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40];
187 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
188 t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41];
189 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
190 t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42];
191 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
192 t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43];
193 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
194 t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44];
195 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
196 t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45];
197 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
198 t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46];
199 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
200 t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47];
201 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
202
203 t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48];
204 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
205 t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49];
206 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
207 t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50];
208 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
209 t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51];
210 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
211 t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52];
212 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
213 t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53];
214 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
215 t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54];
216 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
217 t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55];
218 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
219
220 t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56];
221 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
222 t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57];
223 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
224 t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58];
225 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
226 t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59];
227 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
228 t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60];
229 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
230 t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61];
231 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
232 t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62];
233 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
234 t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63];
235 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
236
237 state[0] += a; state[1] += b; state[2] += c; state[3] += d;
238 state[4] += e; state[5] += f; state[6] += g; state[7] += h;
239
240
241 a = b = c = d = e = f = g = h = t1 = t2 = 0;
242 memset(W, 0, 64 * sizeof(u32));
243}
244
245static void sha256_init(void *ctx)
246{
247 struct sha256_ctx *sctx = ctx;
248 sctx->state[0] = H0;
249 sctx->state[1] = H1;
250 sctx->state[2] = H2;
251 sctx->state[3] = H3;
252 sctx->state[4] = H4;
253 sctx->state[5] = H5;
254 sctx->state[6] = H6;
255 sctx->state[7] = H7;
256 sctx->count[0] = sctx->count[1] = 0;
257 memset(sctx->buf, 0, sizeof(sctx->buf));
258}
259
260static void sha256_update(void *ctx, const u8 *data, unsigned int len)
261{
262 struct sha256_ctx *sctx = ctx;
263 unsigned int i, index, part_len;
264
265
266 index = (unsigned int)((sctx->count[0] >> 3) & 0x3f);
267
268
269 if ((sctx->count[0] += (len << 3)) < (len << 3)) {
270 sctx->count[1]++;
271 sctx->count[1] += (len >> 29);
272 }
273
274 part_len = 64 - index;
275
276
277 if (len >= part_len) {
278 memcpy(&sctx->buf[index], data, part_len);
279 sha256_transform(sctx->state, sctx->buf);
280
281 for (i = part_len; i + 63 < len; i += 64)
282 sha256_transform(sctx->state, &data[i]);
283 index = 0;
284 } else {
285 i = 0;
286 }
287
288
289 memcpy(&sctx->buf[index], &data[i], len-i);
290}
291
292static void sha256_final(void* ctx, u8 *out)
293{
294 struct sha256_ctx *sctx = ctx;
295 u8 bits[8];
296 unsigned int index, pad_len, t;
297 int i, j;
298 static u8 padding[64] = { 0x80, };
299
300
301 t = sctx->count[0];
302 bits[7] = t; t >>= 8;
303 bits[6] = t; t >>= 8;
304 bits[5] = t; t >>= 8;
305 bits[4] = t;
306 t = sctx->count[1];
307 bits[3] = t; t >>= 8;
308 bits[2] = t; t >>= 8;
309 bits[1] = t; t >>= 8;
310 bits[0] = t;
311
312
313 index = (sctx->count[0] >> 3) & 0x3f;
314 pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
315 sha256_update(sctx, padding, pad_len);
316
317
318 sha256_update(sctx, bits, 8);
319
320
321 for (i = j = 0; i < 8; i++, j += 4) {
322 t = sctx->state[i];
323 out[j+3] = t; t >>= 8;
324 out[j+2] = t; t >>= 8;
325 out[j+1] = t; t >>= 8;
326 out[j ] = t;
327 }
328
329
330 memset(sctx, 0, sizeof(*sctx));
331}
332
333
334static struct crypto_alg alg = {
335 .cra_name = "sha256",
336 .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
337 .cra_blocksize = SHA256_HMAC_BLOCK_SIZE,
338 .cra_ctxsize = sizeof(struct sha256_ctx),
339 .cra_module = THIS_MODULE,
340 .cra_list = LIST_HEAD_INIT(alg.cra_list),
341 .cra_u = { .digest = {
342 .dia_digestsize = SHA256_DIGEST_SIZE,
343 .dia_init = sha256_init,
344 .dia_update = sha256_update,
345 .dia_final = sha256_final } }
346};
347
348static int __init init(void)
349{
350 return crypto_register_alg(&alg);
351}
352
353static void __exit fini(void)
354{
355 crypto_unregister_alg(&alg);
356}
357
358module_init(init);
359module_exit(fini);
360
361MODULE_LICENSE("GPL");
362MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");
363
