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 <linux/types.h>
24 #include <crypto/sha.h>
25 #include <asm/scatterlist.h>
26 #include <asm/byteorder.h>
34 static inline u32
Ch(u32 x
, u32 y
, u32 z
)
36 return z
^ (x
& (y
^ z
));
39 static inline u32
Maj(u32 x
, u32 y
, u32 z
)
41 return (x
& y
) | (z
& (x
| y
));
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))
49 static inline void LOAD_OP(int I
, u32
*W
, const u8
*input
)
51 W
[I
] = __be32_to_cpu( ((__be32
*)(input
))[I
] );
54 static inline void BLEND_OP(int I
, u32
*W
)
56 W
[I
] = s1(W
[I
-2]) + W
[I
-7] + s0(W
[I
-15]) + W
[I
-16];
59 static void sha256_transform(u32
*state
, const u8
*input
)
61 u32 a
, b
, c
, d
, e
, f
, g
, h
, t1
, t2
;
66 for (i
= 0; i
< 16; i
++)
70 for (i
= 16; i
< 64; i
++)
73 /* load the state into our registers */
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];
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
;
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
;
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
;
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
;
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
;
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
;
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
;
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
;
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
;
217 /* clear any sensitive info... */
218 a
= b
= c
= d
= e
= f
= g
= h
= t1
= t2
= 0;
219 memset(W
, 0, 64 * sizeof(u32
));
222 static void sha256_init(struct crypto_tfm
*tfm
)
224 struct sha256_ctx
*sctx
= crypto_tfm_ctx(tfm
);
225 sctx
->state
[0] = SHA256_H0
;
226 sctx
->state
[1] = SHA256_H1
;
227 sctx
->state
[2] = SHA256_H2
;
228 sctx
->state
[3] = SHA256_H3
;
229 sctx
->state
[4] = SHA256_H4
;
230 sctx
->state
[5] = SHA256_H5
;
231 sctx
->state
[6] = SHA256_H6
;
232 sctx
->state
[7] = SHA256_H7
;
233 sctx
->count
[0] = sctx
->count
[1] = 0;
236 static void sha256_update(struct crypto_tfm
*tfm
, const u8
*data
,
239 struct sha256_ctx
*sctx
= crypto_tfm_ctx(tfm
);
240 unsigned int i
, index
, part_len
;
242 /* Compute number of bytes mod 128 */
243 index
= (unsigned int)((sctx
->count
[0] >> 3) & 0x3f);
245 /* Update number of bits */
246 if ((sctx
->count
[0] += (len
<< 3)) < (len
<< 3)) {
248 sctx
->count
[1] += (len
>> 29);
251 part_len
= 64 - index
;
253 /* Transform as many times as possible. */
254 if (len
>= part_len
) {
255 memcpy(&sctx
->buf
[index
], data
, part_len
);
256 sha256_transform(sctx
->state
, sctx
->buf
);
258 for (i
= part_len
; i
+ 63 < len
; i
+= 64)
259 sha256_transform(sctx
->state
, &data
[i
]);
265 /* Buffer remaining input */
266 memcpy(&sctx
->buf
[index
], &data
[i
], len
-i
);
269 static void sha256_final(struct crypto_tfm
*tfm
, u8
*out
)
271 struct sha256_ctx
*sctx
= crypto_tfm_ctx(tfm
);
272 __be32
*dst
= (__be32
*)out
;
274 unsigned int index
, pad_len
;
276 static const u8 padding
[64] = { 0x80, };
278 /* Save number of bits */
279 bits
[1] = cpu_to_be32(sctx
->count
[0]);
280 bits
[0] = cpu_to_be32(sctx
->count
[1]);
282 /* Pad out to 56 mod 64. */
283 index
= (sctx
->count
[0] >> 3) & 0x3f;
284 pad_len
= (index
< 56) ? (56 - index
) : ((64+56) - index
);
285 sha256_update(tfm
, padding
, pad_len
);
287 /* Append length (before padding) */
288 sha256_update(tfm
, (const u8
*)bits
, sizeof(bits
));
290 /* Store state in digest */
291 for (i
= 0; i
< 8; i
++)
292 dst
[i
] = cpu_to_be32(sctx
->state
[i
]);
294 /* Zeroize sensitive information. */
295 memset(sctx
, 0, sizeof(*sctx
));
299 static struct crypto_alg alg
= {
300 .cra_name
= "sha256",
301 .cra_driver_name
= "sha256-generic",
302 .cra_flags
= CRYPTO_ALG_TYPE_DIGEST
,
303 .cra_blocksize
= SHA256_BLOCK_SIZE
,
304 .cra_ctxsize
= sizeof(struct sha256_ctx
),
305 .cra_module
= THIS_MODULE
,
307 .cra_list
= LIST_HEAD_INIT(alg
.cra_list
),
308 .cra_u
= { .digest
= {
309 .dia_digestsize
= SHA256_DIGEST_SIZE
,
310 .dia_init
= sha256_init
,
311 .dia_update
= sha256_update
,
312 .dia_final
= sha256_final
} }
315 static int __init
init(void)
317 return crypto_register_alg(&alg
);
320 static void __exit
fini(void)
322 crypto_unregister_alg(&alg
);
328 MODULE_LICENSE("GPL");
329 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");
331 MODULE_ALIAS("sha256");
