xref: /linux/arch/sparc/crypto/sha1_glue.c (revision f9bff0e31881d03badf191d3b0005839391f5f2b)
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 
27 asmlinkage void sha1_sparc64_transform(u32 *digest, const char *data,
28 				       unsigned int rounds);
29 
30 static 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 
51 static 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. */
68 static 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 
101 static 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 
110 static 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 
119 static 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 
137 static 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 
151 static 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 
161 static void __exit sha1_sparc64_mod_fini(void)
162 {
163 	crypto_unregister_shash(&alg);
164 }
165 
166 module_init(sha1_sparc64_mod_init);
167 module_exit(sha1_sparc64_mod_fini);
168 
169 MODULE_LICENSE("GPL");
170 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, sparc64 sha1 opcode accelerated");
171 
172 MODULE_ALIAS_CRYPTO("sha1");
173 
174 #include "crop_devid.c"
175