1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Cryptographic API.
*
* SHA-224 and SHA-256 Secure Hash Algorithm.
*
* Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
*
* Based on crypto/sha256_generic.c, which is:
*
* Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
* SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
*/
#include <linux/mm.h>
#include <crypto/sha2.h>
#include <crypto/sha256_base.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/module.h>
#include <asm/byteorder.h>
#include <asm/octeon/octeon.h>
#include <crypto/internal/hash.h>
#include "octeon-crypto.h"
/*
* We pass everything as 64-bit. OCTEON can handle misaligned data.
*/
static void octeon_sha256_store_hash(struct sha256_state *sctx)
{
u64 *hash = (u64 *)sctx->state;
write_octeon_64bit_hash_dword(hash[0], 0);
write_octeon_64bit_hash_dword(hash[1], 1);
write_octeon_64bit_hash_dword(hash[2], 2);
write_octeon_64bit_hash_dword(hash[3], 3);
}
static void octeon_sha256_read_hash(struct sha256_state *sctx)
{
u64 *hash = (u64 *)sctx->state;
hash[0] = read_octeon_64bit_hash_dword(0);
hash[1] = read_octeon_64bit_hash_dword(1);
hash[2] = read_octeon_64bit_hash_dword(2);
hash[3] = read_octeon_64bit_hash_dword(3);
}
static void octeon_sha256_transform(const void *_block)
{
const u64 *block = _block;
write_octeon_64bit_block_dword(block[0], 0);
write_octeon_64bit_block_dword(block[1], 1);
write_octeon_64bit_block_dword(block[2], 2);
write_octeon_64bit_block_dword(block[3], 3);
write_octeon_64bit_block_dword(block[4], 4);
write_octeon_64bit_block_dword(block[5], 5);
write_octeon_64bit_block_dword(block[6], 6);
octeon_sha256_start(block[7]);
}
static void __octeon_sha256_update(struct sha256_state *sctx, const u8 *data,
unsigned int len)
{
unsigned int partial;
unsigned int done;
const u8 *src;
partial = sctx->count % SHA256_BLOCK_SIZE;
sctx->count += len;
done = 0;
src = data;
if ((partial + len) >= SHA256_BLOCK_SIZE) {
if (partial) {
done = -partial;
memcpy(sctx->buf + partial, data,
done + SHA256_BLOCK_SIZE);
src = sctx->buf;
}
do {
octeon_sha256_transform(src);
done += SHA256_BLOCK_SIZE;
src = data + done;
} while (done + SHA256_BLOCK_SIZE <= len);
partial = 0;
}
memcpy(sctx->buf + partial, src, len - done);
}
static int octeon_sha256_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
struct sha256_state *sctx = shash_desc_ctx(desc);
struct octeon_cop2_state state;
unsigned long flags;
/*
* Small updates never reach the crypto engine, so the generic sha256 is
* faster because of the heavyweight octeon_crypto_enable() /
* octeon_crypto_disable().
*/
if ((sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
return crypto_sha256_update(desc, data, len);
flags = octeon_crypto_enable(&state);
octeon_sha256_store_hash(sctx);
__octeon_sha256_update(sctx, data, len);
octeon_sha256_read_hash(sctx);
octeon_crypto_disable(&state, flags);
return 0;
}
static int octeon_sha256_final(struct shash_desc *desc, u8 *out)
{
struct sha256_state *sctx = shash_desc_ctx(desc);
static const u8 padding[64] = { 0x80, };
struct octeon_cop2_state state;
__be32 *dst = (__be32 *)out;
unsigned int pad_len;
unsigned long flags;
unsigned int index;
__be64 bits;
int i;
/* Save number of bits. */
bits = cpu_to_be64(sctx->count << 3);
/* Pad out to 56 mod 64. */
index = sctx->count & 0x3f;
pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
flags = octeon_crypto_enable(&state);
octeon_sha256_store_hash(sctx);
__octeon_sha256_update(sctx, padding, pad_len);
/* Append length (before padding). */
__octeon_sha256_update(sctx, (const u8 *)&bits, sizeof(bits));
octeon_sha256_read_hash(sctx);
octeon_crypto_disable(&state, flags);
/* Store state in digest */
for (i = 0; i < 8; i++)
dst[i] = cpu_to_be32(sctx->state[i]);
/* Zeroize sensitive information. */
memset(sctx, 0, sizeof(*sctx));
return 0;
}
static int octeon_sha224_final(struct shash_desc *desc, u8 *hash)
{
u8 D[SHA256_DIGEST_SIZE];
octeon_sha256_final(desc, D);
memcpy(hash, D, SHA224_DIGEST_SIZE);
memzero_explicit(D, SHA256_DIGEST_SIZE);
return 0;
}
static int octeon_sha256_export(struct shash_desc *desc, void *out)
{
struct sha256_state *sctx = shash_desc_ctx(desc);
memcpy(out, sctx, sizeof(*sctx));
return 0;
}
static int octeon_sha256_import(struct shash_desc *desc, const void *in)
{
struct sha256_state *sctx = shash_desc_ctx(desc);
memcpy(sctx, in, sizeof(*sctx));
return 0;
}
static struct shash_alg octeon_sha256_algs[2] = { {
.digestsize = SHA256_DIGEST_SIZE,
.init = sha256_base_init,
.update = octeon_sha256_update,
.final = octeon_sha256_final,
.export = octeon_sha256_export,
.import = octeon_sha256_import,
.descsize = sizeof(struct sha256_state),
.statesize = sizeof(struct sha256_state),
.base = {
.cra_name = "sha256",
.cra_driver_name= "octeon-sha256",
.cra_priority = OCTEON_CR_OPCODE_PRIORITY,
.cra_blocksize = SHA256_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
}, {
.digestsize = SHA224_DIGEST_SIZE,
.init = sha224_base_init,
.update = octeon_sha256_update,
.final = octeon_sha224_final,
.descsize = sizeof(struct sha256_state),
.base = {
.cra_name = "sha224",
.cra_driver_name= "octeon-sha224",
.cra_blocksize = SHA224_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
} };
static int __init octeon_sha256_mod_init(void)
{
if (!octeon_has_crypto())
return -ENOTSUPP;
return crypto_register_shashes(octeon_sha256_algs,
ARRAY_SIZE(octeon_sha256_algs));
}
static void __exit octeon_sha256_mod_fini(void)
{
crypto_unregister_shashes(octeon_sha256_algs,
ARRAY_SIZE(octeon_sha256_algs));
}
module_init(octeon_sha256_mod_init);
module_exit(octeon_sha256_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm (OCTEON)");
MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
|
