summaryrefslogtreecommitdiff
path: root/arch/sparc/crypto/sha512_glue.c
blob: 4c55e97a4408d3d2bd5abc4b6be58bf242520ec9 (plain)
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
/* Glue code for SHA512 hashing optimized for sparc64 crypto opcodes.
 *
 * This is based largely upon crypto/sha512_generic.c
 *
 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
 * Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
 */

#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt

#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/cryptohash.h>
#include <linux/types.h>
#include <crypto/sha.h>

#include <asm/pstate.h>
#include <asm/elf.h>

#include "opcodes.h"

asmlinkage void sha512_sparc64_transform(u64 *digest, const char *data,
					 unsigned int rounds);

static int sha512_sparc64_init(struct shash_desc *desc)
{
	struct sha512_state *sctx = shash_desc_ctx(desc);
	sctx->state[0] = SHA512_H0;
	sctx->state[1] = SHA512_H1;
	sctx->state[2] = SHA512_H2;
	sctx->state[3] = SHA512_H3;
	sctx->state[4] = SHA512_H4;
	sctx->state[5] = SHA512_H5;
	sctx->state[6] = SHA512_H6;
	sctx->state[7] = SHA512_H7;
	sctx->count[0] = sctx->count[1] = 0;

	return 0;
}

static int sha384_sparc64_init(struct shash_desc *desc)
{
	struct sha512_state *sctx = shash_desc_ctx(desc);
	sctx->state[0] = SHA384_H0;
	sctx->state[1] = SHA384_H1;
	sctx->state[2] = SHA384_H2;
	sctx->state[3] = SHA384_H3;
	sctx->state[4] = SHA384_H4;
	sctx->state[5] = SHA384_H5;
	sctx->state[6] = SHA384_H6;
	sctx->state[7] = SHA384_H7;
	sctx->count[0] = sctx->count[1] = 0;

	return 0;
}

static void __sha512_sparc64_update(struct sha512_state *sctx, const u8 *data,
				    unsigned int len, unsigned int partial)
{
	unsigned int done = 0;

	if ((sctx->count[0] += len) < len)
		sctx->count[1]++;
	if (partial) {
		done = SHA512_BLOCK_SIZE - partial;
		memcpy(sctx->buf + partial, data, done);
		sha512_sparc64_transform(sctx->state, sctx->buf, 1);
	}
	if (len - done >= SHA512_BLOCK_SIZE) {
		const unsigned int rounds = (len - done) / SHA512_BLOCK_SIZE;

		sha512_sparc64_transform(sctx->state, data + done, rounds);
		done += rounds * SHA512_BLOCK_SIZE;
	}

	memcpy(sctx->buf, data + done, len - done);
}

static int sha512_sparc64_update(struct shash_desc *desc, const u8 *data,
				 unsigned int len)
{
	struct sha512_state *sctx = shash_desc_ctx(desc);
	unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;

	/* Handle the fast case right here */
	if (partial + len < SHA512_BLOCK_SIZE) {
		if ((sctx->count[0] += len) < len)
			sctx->count[1]++;
		memcpy(sctx->buf + partial, data, len);
	} else
		__sha512_sparc64_update(sctx, data, len, partial);

	return 0;
}

static int sha512_sparc64_final(struct shash_desc *desc, u8 *out)
{
	struct sha512_state *sctx = shash_desc_ctx(desc);
	unsigned int i, index, padlen;
	__be64 *dst = (__be64 *)out;
	__be64 bits[2];
	static const u8 padding[SHA512_BLOCK_SIZE] = { 0x80, };

	/* Save number of bits */
	bits[1] = cpu_to_be64(sctx->count[0] << 3);
	bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);

	/* Pad out to 112 mod 128 and append length */
	index = sctx->count[0] % SHA512_BLOCK_SIZE;
	padlen = (index < 112) ? (112 - index) : ((SHA512_BLOCK_SIZE+112) - index);

	/* We need to fill a whole block for __sha512_sparc64_update() */
	if (padlen <= 112) {
		if ((sctx->count[0] += padlen) < padlen)
			sctx->count[1]++;
		memcpy(sctx->buf + index, padding, padlen);
	} else {
		__sha512_sparc64_update(sctx, padding, padlen, index);
	}
	__sha512_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 112);

	/* Store state in digest */
	for (i = 0; i < 8; i++)
		dst[i] = cpu_to_be64(sctx->state[i]);

	/* Wipe context */
	memset(sctx, 0, sizeof(*sctx));

	return 0;
}

static int sha384_sparc64_final(struct shash_desc *desc, u8 *hash)
{
	u8 D[64];

	sha512_sparc64_final(desc, D);

	memcpy(hash, D, 48);
	memzero_explicit(D, 64);

	return 0;
}

static struct shash_alg sha512 = {
	.digestsize	=	SHA512_DIGEST_SIZE,
	.init		=	sha512_sparc64_init,
	.update		=	sha512_sparc64_update,
	.final		=	sha512_sparc64_final,
	.descsize	=	sizeof(struct sha512_state),
	.base		=	{
		.cra_name	=	"sha512",
		.cra_driver_name=	"sha512-sparc64",
		.cra_priority	=	SPARC_CR_OPCODE_PRIORITY,
		.cra_blocksize	=	SHA512_BLOCK_SIZE,
		.cra_module	=	THIS_MODULE,
	}
};

static struct shash_alg sha384 = {
	.digestsize	=	SHA384_DIGEST_SIZE,
	.init		=	sha384_sparc64_init,
	.update		=	sha512_sparc64_update,
	.final		=	sha384_sparc64_final,
	.descsize	=	sizeof(struct sha512_state),
	.base		=	{
		.cra_name	=	"sha384",
		.cra_driver_name=	"sha384-sparc64",
		.cra_priority	=	SPARC_CR_OPCODE_PRIORITY,
		.cra_blocksize	=	SHA384_BLOCK_SIZE,
		.cra_module	=	THIS_MODULE,
	}
};

static bool __init sparc64_has_sha512_opcode(void)
{
	unsigned long cfr;

	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
		return false;

	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
	if (!(cfr & CFR_SHA512))
		return false;

	return true;
}

static int __init sha512_sparc64_mod_init(void)
{
	if (sparc64_has_sha512_opcode()) {
		int ret = crypto_register_shash(&sha384);
		if (ret < 0)
			return ret;

		ret = crypto_register_shash(&sha512);
		if (ret < 0) {
			crypto_unregister_shash(&sha384);
			return ret;
		}

		pr_info("Using sparc64 sha512 opcode optimized SHA-512/SHA-384 implementation\n");
		return 0;
	}
	pr_info("sparc64 sha512 opcode not available.\n");
	return -ENODEV;
}

static void __exit sha512_sparc64_mod_fini(void)
{
	crypto_unregister_shash(&sha384);
	crypto_unregister_shash(&sha512);
}

module_init(sha512_sparc64_mod_init);
module_exit(sha512_sparc64_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA-384 and SHA-512 Secure Hash Algorithm, sparc64 sha512 opcode accelerated");

MODULE_ALIAS_CRYPTO("sha384");
MODULE_ALIAS_CRYPTO("sha512");

#include "crop_devid.c"