1/* Glue code for SHA512 hashing optimized for sparc64 crypto opcodes.
2 *
3 * This is based largely upon crypto/sha512_generic.c
4 *
5 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
6 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
7 * Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
8 */
9
10#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
11
12#include <crypto/internal/hash.h>
13#include <linux/init.h>
14#include <linux/module.h>
15#include <linux/mm.h>
16#include <linux/cryptohash.h>
17#include <linux/types.h>
18#include <crypto/sha.h>
19
20#include <asm/pstate.h>
21#include <asm/elf.h>
22
23#include "opcodes.h"
24
25asmlinkage void sha512_sparc64_transform(u64 *digest, const char *data,
26					 unsigned int rounds);
27
28static int sha512_sparc64_init(struct shash_desc *desc)
29{
30	struct sha512_state *sctx = shash_desc_ctx(desc);
31	sctx->state[0] = SHA512_H0;
32	sctx->state[1] = SHA512_H1;
33	sctx->state[2] = SHA512_H2;
34	sctx->state[3] = SHA512_H3;
35	sctx->state[4] = SHA512_H4;
36	sctx->state[5] = SHA512_H5;
37	sctx->state[6] = SHA512_H6;
38	sctx->state[7] = SHA512_H7;
39	sctx->count[0] = sctx->count[1] = 0;
40
41	return 0;
42}
43
44static int sha384_sparc64_init(struct shash_desc *desc)
45{
46	struct sha512_state *sctx = shash_desc_ctx(desc);
47	sctx->state[0] = SHA384_H0;
48	sctx->state[1] = SHA384_H1;
49	sctx->state[2] = SHA384_H2;
50	sctx->state[3] = SHA384_H3;
51	sctx->state[4] = SHA384_H4;
52	sctx->state[5] = SHA384_H5;
53	sctx->state[6] = SHA384_H6;
54	sctx->state[7] = SHA384_H7;
55	sctx->count[0] = sctx->count[1] = 0;
56
57	return 0;
58}
59
60static void __sha512_sparc64_update(struct sha512_state *sctx, const u8 *data,
61				    unsigned int len, unsigned int partial)
62{
63	unsigned int done = 0;
64
65	if ((sctx->count[0] += len) < len)
66		sctx->count[1]++;
67	if (partial) {
68		done = SHA512_BLOCK_SIZE - partial;
69		memcpy(sctx->buf + partial, data, done);
70		sha512_sparc64_transform(sctx->state, sctx->buf, 1);
71	}
72	if (len - done >= SHA512_BLOCK_SIZE) {
73		const unsigned int rounds = (len - done) / SHA512_BLOCK_SIZE;
74
75		sha512_sparc64_transform(sctx->state, data + done, rounds);
76		done += rounds * SHA512_BLOCK_SIZE;
77	}
78
79	memcpy(sctx->buf, data + done, len - done);
80}
81
82static int sha512_sparc64_update(struct shash_desc *desc, const u8 *data,
83				 unsigned int len)
84{
85	struct sha512_state *sctx = shash_desc_ctx(desc);
86	unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
87
88	/* Handle the fast case right here */
89	if (partial + len < SHA512_BLOCK_SIZE) {
90		if ((sctx->count[0] += len) < len)
91			sctx->count[1]++;
92		memcpy(sctx->buf + partial, data, len);
93	} else
94		__sha512_sparc64_update(sctx, data, len, partial);
95
96	return 0;
97}
98
99static int sha512_sparc64_final(struct shash_desc *desc, u8 *out)
100{
101	struct sha512_state *sctx = shash_desc_ctx(desc);
102	unsigned int i, index, padlen;
103	__be64 *dst = (__be64 *)out;
104	__be64 bits[2];
105	static const u8 padding[SHA512_BLOCK_SIZE] = { 0x80, };
106
107	/* Save number of bits */
108	bits[1] = cpu_to_be64(sctx->count[0] << 3);
109	bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
110
111	/* Pad out to 112 mod 128 and append length */
112	index = sctx->count[0] % SHA512_BLOCK_SIZE;
113	padlen = (index < 112) ? (112 - index) : ((SHA512_BLOCK_SIZE+112) - index);
114
115	/* We need to fill a whole block for __sha512_sparc64_update() */
116	if (padlen <= 112) {
117		if ((sctx->count[0] += padlen) < padlen)
118			sctx->count[1]++;
119		memcpy(sctx->buf + index, padding, padlen);
120	} else {
121		__sha512_sparc64_update(sctx, padding, padlen, index);
122	}
123	__sha512_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 112);
124
125	/* Store state in digest */
126	for (i = 0; i < 8; i++)
127		dst[i] = cpu_to_be64(sctx->state[i]);
128
129	/* Wipe context */
130	memset(sctx, 0, sizeof(*sctx));
131
132	return 0;
133}
134
135static int sha384_sparc64_final(struct shash_desc *desc, u8 *hash)
136{
137	u8 D[64];
138
139	sha512_sparc64_final(desc, D);
140
141	memcpy(hash, D, 48);
142	memzero_explicit(D, 64);
143
144	return 0;
145}
146
147static struct shash_alg sha512 = {
148	.digestsize	=	SHA512_DIGEST_SIZE,
149	.init		=	sha512_sparc64_init,
150	.update		=	sha512_sparc64_update,
151	.final		=	sha512_sparc64_final,
152	.descsize	=	sizeof(struct sha512_state),
153	.base		=	{
154		.cra_name	=	"sha512",
155		.cra_driver_name=	"sha512-sparc64",
156		.cra_priority	=	SPARC_CR_OPCODE_PRIORITY,
157		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
158		.cra_blocksize	=	SHA512_BLOCK_SIZE,
159		.cra_module	=	THIS_MODULE,
160	}
161};
162
163static struct shash_alg sha384 = {
164	.digestsize	=	SHA384_DIGEST_SIZE,
165	.init		=	sha384_sparc64_init,
166	.update		=	sha512_sparc64_update,
167	.final		=	sha384_sparc64_final,
168	.descsize	=	sizeof(struct sha512_state),
169	.base		=	{
170		.cra_name	=	"sha384",
171		.cra_driver_name=	"sha384-sparc64",
172		.cra_priority	=	SPARC_CR_OPCODE_PRIORITY,
173		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
174		.cra_blocksize	=	SHA384_BLOCK_SIZE,
175		.cra_module	=	THIS_MODULE,
176	}
177};
178
179static bool __init sparc64_has_sha512_opcode(void)
180{
181	unsigned long cfr;
182
183	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
184		return false;
185
186	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
187	if (!(cfr & CFR_SHA512))
188		return false;
189
190	return true;
191}
192
193static int __init sha512_sparc64_mod_init(void)
194{
195	if (sparc64_has_sha512_opcode()) {
196		int ret = crypto_register_shash(&sha384);
197		if (ret < 0)
198			return ret;
199
200		ret = crypto_register_shash(&sha512);
201		if (ret < 0) {
202			crypto_unregister_shash(&sha384);
203			return ret;
204		}
205
206		pr_info("Using sparc64 sha512 opcode optimized SHA-512/SHA-384 implementation\n");
207		return 0;
208	}
209	pr_info("sparc64 sha512 opcode not available.\n");
210	return -ENODEV;
211}
212
213static void __exit sha512_sparc64_mod_fini(void)
214{
215	crypto_unregister_shash(&sha384);
216	crypto_unregister_shash(&sha512);
217}
218
219module_init(sha512_sparc64_mod_init);
220module_exit(sha512_sparc64_mod_fini);
221
222MODULE_LICENSE("GPL");
223MODULE_DESCRIPTION("SHA-384 and SHA-512 Secure Hash Algorithm, sparc64 sha512 opcode accelerated");
224
225MODULE_ALIAS_CRYPTO("sha384");
226MODULE_ALIAS_CRYPTO("sha512");
227
228#include "crop_devid.c"
229