4 * SHA-256, as specified in
5 * http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf
7 * SHA-256 code by Jean-Luc Cooke <jlcooke@certainkey.com>.
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>
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)
19 #include <linux/init.h>
20 #include <linux/module.h>
22 #include <linux/crypto.h>
23 #include <asm/scatterlist.h>
24 #include <asm/byteorder.h>
26 #define SHA256_DIGEST_SIZE 32
27 #define SHA256_HMAC_BLOCK_SIZE 64
35 static inline u32
Ch(u32 x
, u32 y
, u32 z
)
37 return z
^ (x
& (y
^ z
));
40 static inline u32
Maj(u32 x
, u32 y
, u32 z
)
42 return (x
& y
) | (z
& (x
| y
));
45 static inline u32
RORu32(u32 x
, u32 y
)
47 return (x
>> y
) | (x
<< (32 - y
));
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))
64 static inline void LOAD_OP(int I
, u32
*W
, const u8
*input
)
66 u32 t1
= input
[(4 * I
)] & 0xff;
69 t1
|= input
[(4 * I
) + 1] & 0xff;
71 t1
|= input
[(4 * I
) + 2] & 0xff;
73 t1
|= input
[(4 * I
) + 3] & 0xff;
77 static inline void BLEND_OP(int I
, u32
*W
)
79 W
[I
] = s1(W
[I
-2]) + W
[I
-7] + s0(W
[I
-15]) + W
[I
-16];
82 static void sha256_transform(u32
*state
, const u8
*input
)
84 u32 a
, b
, c
, d
, e
, f
, g
, h
, t1
, t2
;
89 for (i
= 0; i
< 16; i
++)
93 for (i
= 16; i
< 64; i
++)
96 /* load the state into our registers */
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];
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
;
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
;
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
;
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
;
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
;
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
;
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
;
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
;
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
;
240 /* clear any sensitive info... */
241 a
= b
= c
= d
= e
= f
= g
= h
= t1
= t2
= 0;
242 memset(W
, 0, 64 * sizeof(u32
));
245 static void sha256_init(void *ctx
)
247 struct sha256_ctx
*sctx
= ctx
;
256 sctx
->count
[0] = sctx
->count
[1] = 0;
257 memset(sctx
->buf
, 0, sizeof(sctx
->buf
));
260 static void sha256_update(void *ctx
, const u8
*data
, unsigned int len
)
262 struct sha256_ctx
*sctx
= ctx
;
263 unsigned int i
, index
, part_len
;
265 /* Compute number of bytes mod 128 */
266 index
= (unsigned int)((sctx
->count
[0] >> 3) & 0x3f);
268 /* Update number of bits */
269 if ((sctx
->count
[0] += (len
<< 3)) < (len
<< 3)) {
271 sctx
->count
[1] += (len
>> 29);
274 part_len
= 64 - index
;
276 /* Transform as many times as possible. */
277 if (len
>= part_len
) {
278 memcpy(&sctx
->buf
[index
], data
, part_len
);
279 sha256_transform(sctx
->state
, sctx
->buf
);
281 for (i
= part_len
; i
+ 63 < len
; i
+= 64)
282 sha256_transform(sctx
->state
, &data
[i
]);
288 /* Buffer remaining input */
289 memcpy(&sctx
->buf
[index
], &data
[i
], len
-i
);
292 static void sha256_final(void* ctx
, u8
*out
)
294 struct sha256_ctx
*sctx
= ctx
;
296 unsigned int index
, pad_len
, t
;
298 static const u8 padding
[64] = { 0x80, };
300 /* Save number of bits */
302 bits
[7] = t
; t
>>= 8;
303 bits
[6] = t
; t
>>= 8;
304 bits
[5] = t
; t
>>= 8;
307 bits
[3] = t
; t
>>= 8;
308 bits
[2] = t
; t
>>= 8;
309 bits
[1] = t
; t
>>= 8;
312 /* Pad out to 56 mod 64. */
313 index
= (sctx
->count
[0] >> 3) & 0x3f;
314 pad_len
= (index
< 56) ? (56 - index
) : ((64+56) - index
);
315 sha256_update(sctx
, padding
, pad_len
);
317 /* Append length (before padding) */
318 sha256_update(sctx
, bits
, 8);
320 /* Store state in digest */
321 for (i
= j
= 0; i
< 8; i
++, j
+= 4) {
323 out
[j
+3] = t
; t
>>= 8;
324 out
[j
+2] = t
; t
>>= 8;
325 out
[j
+1] = t
; t
>>= 8;
329 /* Zeroize sensitive information. */
330 memset(sctx
, 0, sizeof(*sctx
));
334 static 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
} }
348 static int __init
init(void)
350 return crypto_register_alg(&alg
);
353 static void __exit
fini(void)
355 crypto_unregister_alg(&alg
);
361 MODULE_LICENSE("GPL");
362 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");
