1// SPDX-License-Identifier: GPL-2.0-only
2/* Glue code for SHA1 hashing optimized for sparc64 crypto opcodes.
3 *
4 * This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c
5 *
6 * Copyright (c) Alan Smithee.
7 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
8 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
9 * Copyright (c) Mathias Krause <minipli@googlemail.com>
10 */
11
12#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
13
14#include <crypto/internal/hash.h>
15#include <linux/init.h>
16#include <linux/module.h>
17#include <linux/mm.h>
18#include <linux/types.h>
19#include <crypto/sha1.h>
20#include <crypto/sha1_base.h>
21
22#include <asm/pstate.h>
23#include <asm/elf.h>
24
25#include "opcodes.h"
26
27asmlinkage void sha1_sparc64_transform(u32 *digest, const char *data,
28				       unsigned int rounds);
29
30static void __sha1_sparc64_update(struct sha1_state *sctx, const u8 *data,
31				  unsigned int len, unsigned int partial)
32{
33	unsigned int done = 0;
34
35	sctx->count += len;
36	if (partial) {
37		done = SHA1_BLOCK_SIZE - partial;
38		memcpy(sctx->buffer + partial, data, done);
39		sha1_sparc64_transform(sctx->state, sctx->buffer, 1);
40	}
41	if (len - done >= SHA1_BLOCK_SIZE) {
42		const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE;
43
44		sha1_sparc64_transform(sctx->state, data + done, rounds);
45		done += rounds * SHA1_BLOCK_SIZE;
46	}
47
48	memcpy(sctx->buffer, data + done, len - done);
49}
50
51static int sha1_sparc64_update(struct shash_desc *desc, const u8 *data,
52			       unsigned int len)
53{
54	struct sha1_state *sctx = shash_desc_ctx(desc);
55	unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
56
57	/* Handle the fast case right here */
58	if (partial + len < SHA1_BLOCK_SIZE) {
59		sctx->count += len;
60		memcpy(sctx->buffer + partial, data, len);
61	} else
62		__sha1_sparc64_update(sctx, data, len, partial);
63
64	return 0;
65}
66
67/* Add padding and return the message digest. */
68static int sha1_sparc64_final(struct shash_desc *desc, u8 *out)
69{
70	struct sha1_state *sctx = shash_desc_ctx(desc);
71	unsigned int i, index, padlen;
72	__be32 *dst = (__be32 *)out;
73	__be64 bits;
74	static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, };
75
76	bits = cpu_to_be64(sctx->count << 3);
77
78	/* Pad out to 56 mod 64 and append length */
79	index = sctx->count % SHA1_BLOCK_SIZE;
80	padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index);
81
82	/* We need to fill a whole block for __sha1_sparc64_update() */
83	if (padlen <= 56) {
84		sctx->count += padlen;
85		memcpy(sctx->buffer + index, padding, padlen);
86	} else {
87		__sha1_sparc64_update(sctx, padding, padlen, index);
88	}
89	__sha1_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
90
91	/* Store state in digest */
92	for (i = 0; i < 5; i++)
93		dst[i] = cpu_to_be32(sctx->state[i]);
94
95	/* Wipe context */
96	memset(sctx, 0, sizeof(*sctx));
97
98	return 0;
99}
100
101static int sha1_sparc64_export(struct shash_desc *desc, void *out)
102{
103	struct sha1_state *sctx = shash_desc_ctx(desc);
104
105	memcpy(out, sctx, sizeof(*sctx));
106
107	return 0;
108}
109
110static int sha1_sparc64_import(struct shash_desc *desc, const void *in)
111{
112	struct sha1_state *sctx = shash_desc_ctx(desc);
113
114	memcpy(sctx, in, sizeof(*sctx));
115
116	return 0;
117}
118
119static struct shash_alg alg = {
120	.digestsize	=	SHA1_DIGEST_SIZE,
121	.init		=	sha1_base_init,
122	.update		=	sha1_sparc64_update,
123	.final		=	sha1_sparc64_final,
124	.export		=	sha1_sparc64_export,
125	.import		=	sha1_sparc64_import,
126	.descsize	=	sizeof(struct sha1_state),
127	.statesize	=	sizeof(struct sha1_state),
128	.base		=	{
129		.cra_name	=	"sha1",
130		.cra_driver_name=	"sha1-sparc64",
131		.cra_priority	=	SPARC_CR_OPCODE_PRIORITY,
132		.cra_blocksize	=	SHA1_BLOCK_SIZE,
133		.cra_module	=	THIS_MODULE,
134	}
135};
136
137static bool __init sparc64_has_sha1_opcode(void)
138{
139	unsigned long cfr;
140
141	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
142		return false;
143
144	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
145	if (!(cfr & CFR_SHA1))
146		return false;
147
148	return true;
149}
150
151static int __init sha1_sparc64_mod_init(void)
152{
153	if (sparc64_has_sha1_opcode()) {
154		pr_info("Using sparc64 sha1 opcode optimized SHA-1 implementation\n");
155		return crypto_register_shash(&alg);
156	}
157	pr_info("sparc64 sha1 opcode not available.\n");
158	return -ENODEV;
159}
160
161static void __exit sha1_sparc64_mod_fini(void)
162{
163	crypto_unregister_shash(&alg);
164}
165
166module_init(sha1_sparc64_mod_init);
167module_exit(sha1_sparc64_mod_fini);
168
169MODULE_LICENSE("GPL");
170MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, sparc64 sha1 opcode accelerated");
171
172MODULE_ALIAS_CRYPTO("sha1");
173
174#include "crop_devid.c"
175