xref: /openbmc/linux/arch/sparc/crypto/sha512_glue.c (revision c35a824c)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Glue code for SHA512 hashing optimized for sparc64 crypto opcodes.
3  *
4  * This is based largely upon crypto/sha512_generic.c
5  *
6  * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
7  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
8  * Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
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/types.h>
18 #include <crypto/sha2.h>
19 
20 #include <asm/pstate.h>
21 #include <asm/elf.h>
22 
23 #include "opcodes.h"
24 
25 asmlinkage void sha512_sparc64_transform(u64 *digest, const char *data,
26 					 unsigned int rounds);
27 
28 static 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 
44 static 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 
60 static 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 
82 static 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 
99 static 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 
135 static 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 
147 static 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_blocksize	=	SHA512_BLOCK_SIZE,
158 		.cra_module	=	THIS_MODULE,
159 	}
160 };
161 
162 static struct shash_alg sha384 = {
163 	.digestsize	=	SHA384_DIGEST_SIZE,
164 	.init		=	sha384_sparc64_init,
165 	.update		=	sha512_sparc64_update,
166 	.final		=	sha384_sparc64_final,
167 	.descsize	=	sizeof(struct sha512_state),
168 	.base		=	{
169 		.cra_name	=	"sha384",
170 		.cra_driver_name=	"sha384-sparc64",
171 		.cra_priority	=	SPARC_CR_OPCODE_PRIORITY,
172 		.cra_blocksize	=	SHA384_BLOCK_SIZE,
173 		.cra_module	=	THIS_MODULE,
174 	}
175 };
176 
177 static bool __init sparc64_has_sha512_opcode(void)
178 {
179 	unsigned long cfr;
180 
181 	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
182 		return false;
183 
184 	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
185 	if (!(cfr & CFR_SHA512))
186 		return false;
187 
188 	return true;
189 }
190 
191 static int __init sha512_sparc64_mod_init(void)
192 {
193 	if (sparc64_has_sha512_opcode()) {
194 		int ret = crypto_register_shash(&sha384);
195 		if (ret < 0)
196 			return ret;
197 
198 		ret = crypto_register_shash(&sha512);
199 		if (ret < 0) {
200 			crypto_unregister_shash(&sha384);
201 			return ret;
202 		}
203 
204 		pr_info("Using sparc64 sha512 opcode optimized SHA-512/SHA-384 implementation\n");
205 		return 0;
206 	}
207 	pr_info("sparc64 sha512 opcode not available.\n");
208 	return -ENODEV;
209 }
210 
211 static void __exit sha512_sparc64_mod_fini(void)
212 {
213 	crypto_unregister_shash(&sha384);
214 	crypto_unregister_shash(&sha512);
215 }
216 
217 module_init(sha512_sparc64_mod_init);
218 module_exit(sha512_sparc64_mod_fini);
219 
220 MODULE_LICENSE("GPL");
221 MODULE_DESCRIPTION("SHA-384 and SHA-512 Secure Hash Algorithm, sparc64 sha512 opcode accelerated");
222 
223 MODULE_ALIAS_CRYPTO("sha384");
224 MODULE_ALIAS_CRYPTO("sha512");
225 
226 #include "crop_devid.c"
227