1/* Glue code for SHA1 hashing optimized for sparc64 crypto opcodes.
2 *
3 * This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c
4 *
5 * Copyright (c) Alan Smithee.
6 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
7 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
8 * Copyright (c) Mathias Krause <minipli@googlemail.com>
9 */
10
11#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
12
13#include <crypto/internal/hash.h>
14#include <linux/init.h>
15#include <linux/module.h>
16#include <linux/mm.h>
17#include <linux/cryptohash.h>
18#include <linux/types.h>
19#include <crypto/sha.h>
20
21#include <asm/pstate.h>
22#include <asm/elf.h>
23
24#include "opcodes.h"
25
26asmlinkage void sha1_sparc64_transform(u32 *digest, const char *data,
27				       unsigned int rounds);
28
29static int sha1_sparc64_init(struct shash_desc *desc)
30{
31	struct sha1_state *sctx = shash_desc_ctx(desc);
32
33	*sctx = (struct sha1_state){
34		.state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
35	};
36
37	return 0;
38}
39
40static void __sha1_sparc64_update(struct sha1_state *sctx, const u8 *data,
41				  unsigned int len, unsigned int partial)
42{
43	unsigned int done = 0;
44
45	sctx->count += len;
46	if (partial) {
47		done = SHA1_BLOCK_SIZE - partial;
48		memcpy(sctx->buffer + partial, data, done);
49		sha1_sparc64_transform(sctx->state, sctx->buffer, 1);
50	}
51	if (len - done >= SHA1_BLOCK_SIZE) {
52		const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE;
53
54		sha1_sparc64_transform(sctx->state, data + done, rounds);
55		done += rounds * SHA1_BLOCK_SIZE;
56	}
57
58	memcpy(sctx->buffer, data + done, len - done);
59}
60
61static int sha1_sparc64_update(struct shash_desc *desc, const u8 *data,
62			       unsigned int len)
63{
64	struct sha1_state *sctx = shash_desc_ctx(desc);
65	unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
66
67	/* Handle the fast case right here */
68	if (partial + len < SHA1_BLOCK_SIZE) {
69		sctx->count += len;
70		memcpy(sctx->buffer + partial, data, len);
71	} else
72		__sha1_sparc64_update(sctx, data, len, partial);
73
74	return 0;
75}
76
77/* Add padding and return the message digest. */
78static int sha1_sparc64_final(struct shash_desc *desc, u8 *out)
79{
80	struct sha1_state *sctx = shash_desc_ctx(desc);
81	unsigned int i, index, padlen;
82	__be32 *dst = (__be32 *)out;
83	__be64 bits;
84	static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, };
85
86	bits = cpu_to_be64(sctx->count << 3);
87
88	/* Pad out to 56 mod 64 and append length */
89	index = sctx->count % SHA1_BLOCK_SIZE;
90	padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index);
91
92	/* We need to fill a whole block for __sha1_sparc64_update() */
93	if (padlen <= 56) {
94		sctx->count += padlen;
95		memcpy(sctx->buffer + index, padding, padlen);
96	} else {
97		__sha1_sparc64_update(sctx, padding, padlen, index);
98	}
99	__sha1_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
100
101	/* Store state in digest */
102	for (i = 0; i < 5; i++)
103		dst[i] = cpu_to_be32(sctx->state[i]);
104
105	/* Wipe context */
106	memset(sctx, 0, sizeof(*sctx));
107
108	return 0;
109}
110
111static int sha1_sparc64_export(struct shash_desc *desc, void *out)
112{
113	struct sha1_state *sctx = shash_desc_ctx(desc);
114
115	memcpy(out, sctx, sizeof(*sctx));
116
117	return 0;
118}
119
120static int sha1_sparc64_import(struct shash_desc *desc, const void *in)
121{
122	struct sha1_state *sctx = shash_desc_ctx(desc);
123
124	memcpy(sctx, in, sizeof(*sctx));
125
126	return 0;
127}
128
129static struct shash_alg alg = {
130	.digestsize	=	SHA1_DIGEST_SIZE,
131	.init		=	sha1_sparc64_init,
132	.update		=	sha1_sparc64_update,
133	.final		=	sha1_sparc64_final,
134	.export		=	sha1_sparc64_export,
135	.import		=	sha1_sparc64_import,
136	.descsize	=	sizeof(struct sha1_state),
137	.statesize	=	sizeof(struct sha1_state),
138	.base		=	{
139		.cra_name	=	"sha1",
140		.cra_driver_name=	"sha1-sparc64",
141		.cra_priority	=	SPARC_CR_OPCODE_PRIORITY,
142		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
143		.cra_blocksize	=	SHA1_BLOCK_SIZE,
144		.cra_module	=	THIS_MODULE,
145	}
146};
147
148static bool __init sparc64_has_sha1_opcode(void)
149{
150	unsigned long cfr;
151
152	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
153		return false;
154
155	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
156	if (!(cfr & CFR_SHA1))
157		return false;
158
159	return true;
160}
161
162static int __init sha1_sparc64_mod_init(void)
163{
164	if (sparc64_has_sha1_opcode()) {
165		pr_info("Using sparc64 sha1 opcode optimized SHA-1 implementation\n");
166		return crypto_register_shash(&alg);
167	}
168	pr_info("sparc64 sha1 opcode not available.\n");
169	return -ENODEV;
170}
171
172static void __exit sha1_sparc64_mod_fini(void)
173{
174	crypto_unregister_shash(&alg);
175}
176
177module_init(sha1_sparc64_mod_init);
178module_exit(sha1_sparc64_mod_fini);
179
180MODULE_LICENSE("GPL");
181MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, sparc64 sha1 opcode accelerated");
182
183MODULE_ALIAS_CRYPTO("sha1");
184
185#include "crop_devid.c"
186