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