1// SPDX-License-Identifier: GPL-2.0-only
  2/* Glue code for SHA256 hashing optimized for sparc64 crypto opcodes.
  3 *
  4 * This is based largely upon crypto/sha256_generic.c
  5 *
  6 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
  7 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
  8 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  9 * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.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/cryptohash.h>
 19#include <linux/types.h>
 20#include <crypto/sha.h>
 21
 22#include <asm/pstate.h>
 23#include <asm/elf.h>
 24
 25#include "opcodes.h"
 26
 27asmlinkage void sha256_sparc64_transform(u32 *digest, const char *data,
 28					 unsigned int rounds);
 29
 30static int sha224_sparc64_init(struct shash_desc *desc)
 31{
 32	struct sha256_state *sctx = shash_desc_ctx(desc);
 33	sctx->state[0] = SHA224_H0;
 34	sctx->state[1] = SHA224_H1;
 35	sctx->state[2] = SHA224_H2;
 36	sctx->state[3] = SHA224_H3;
 37	sctx->state[4] = SHA224_H4;
 38	sctx->state[5] = SHA224_H5;
 39	sctx->state[6] = SHA224_H6;
 40	sctx->state[7] = SHA224_H7;
 41	sctx->count = 0;
 42
 43	return 0;
 44}
 45
 46static int sha256_sparc64_init(struct shash_desc *desc)
 47{
 48	struct sha256_state *sctx = shash_desc_ctx(desc);
 49	sctx->state[0] = SHA256_H0;
 50	sctx->state[1] = SHA256_H1;
 51	sctx->state[2] = SHA256_H2;
 52	sctx->state[3] = SHA256_H3;
 53	sctx->state[4] = SHA256_H4;
 54	sctx->state[5] = SHA256_H5;
 55	sctx->state[6] = SHA256_H6;
 56	sctx->state[7] = SHA256_H7;
 57	sctx->count = 0;
 58
 59	return 0;
 60}
 61
 62static void __sha256_sparc64_update(struct sha256_state *sctx, const u8 *data,
 63				    unsigned int len, unsigned int partial)
 64{
 65	unsigned int done = 0;
 66
 67	sctx->count += len;
 68	if (partial) {
 69		done = SHA256_BLOCK_SIZE - partial;
 70		memcpy(sctx->buf + partial, data, done);
 71		sha256_sparc64_transform(sctx->state, sctx->buf, 1);
 72	}
 73	if (len - done >= SHA256_BLOCK_SIZE) {
 74		const unsigned int rounds = (len - done) / SHA256_BLOCK_SIZE;
 75
 76		sha256_sparc64_transform(sctx->state, data + done, rounds);
 77		done += rounds * SHA256_BLOCK_SIZE;
 78	}
 79
 80	memcpy(sctx->buf, data + done, len - done);
 81}
 82
 83static int sha256_sparc64_update(struct shash_desc *desc, const u8 *data,
 84				 unsigned int len)
 85{
 86	struct sha256_state *sctx = shash_desc_ctx(desc);
 87	unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
 88
 89	/* Handle the fast case right here */
 90	if (partial + len < SHA256_BLOCK_SIZE) {
 91		sctx->count += len;
 92		memcpy(sctx->buf + partial, data, len);
 93	} else
 94		__sha256_sparc64_update(sctx, data, len, partial);
 95
 96	return 0;
 97}
 98
 99static int sha256_sparc64_final(struct shash_desc *desc, u8 *out)
100{
101	struct sha256_state *sctx = shash_desc_ctx(desc);
102	unsigned int i, index, padlen;
103	__be32 *dst = (__be32 *)out;
104	__be64 bits;
105	static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, };
106
107	bits = cpu_to_be64(sctx->count << 3);
108
109	/* Pad out to 56 mod 64 and append length */
110	index = sctx->count % SHA256_BLOCK_SIZE;
111	padlen = (index < 56) ? (56 - index) : ((SHA256_BLOCK_SIZE+56) - index);
112
113	/* We need to fill a whole block for __sha256_sparc64_update() */
114	if (padlen <= 56) {
115		sctx->count += padlen;
116		memcpy(sctx->buf + index, padding, padlen);
117	} else {
118		__sha256_sparc64_update(sctx, padding, padlen, index);
119	}
120	__sha256_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
121
122	/* Store state in digest */
123	for (i = 0; i < 8; i++)
124		dst[i] = cpu_to_be32(sctx->state[i]);
125
126	/* Wipe context */
127	memset(sctx, 0, sizeof(*sctx));
128
129	return 0;
130}
131
132static int sha224_sparc64_final(struct shash_desc *desc, u8 *hash)
133{
134	u8 D[SHA256_DIGEST_SIZE];
135
136	sha256_sparc64_final(desc, D);
137
138	memcpy(hash, D, SHA224_DIGEST_SIZE);
139	memzero_explicit(D, SHA256_DIGEST_SIZE);
140
141	return 0;
142}
143
144static int sha256_sparc64_export(struct shash_desc *desc, void *out)
145{
146	struct sha256_state *sctx = shash_desc_ctx(desc);
147
148	memcpy(out, sctx, sizeof(*sctx));
149	return 0;
150}
151
152static int sha256_sparc64_import(struct shash_desc *desc, const void *in)
153{
154	struct sha256_state *sctx = shash_desc_ctx(desc);
155
156	memcpy(sctx, in, sizeof(*sctx));
157	return 0;
158}
159
160static struct shash_alg sha256 = {
161	.digestsize	=	SHA256_DIGEST_SIZE,
162	.init		=	sha256_sparc64_init,
163	.update		=	sha256_sparc64_update,
164	.final		=	sha256_sparc64_final,
165	.export		=	sha256_sparc64_export,
166	.import		=	sha256_sparc64_import,
167	.descsize	=	sizeof(struct sha256_state),
168	.statesize	=	sizeof(struct sha256_state),
169	.base		=	{
170		.cra_name	=	"sha256",
171		.cra_driver_name=	"sha256-sparc64",
172		.cra_priority	=	SPARC_CR_OPCODE_PRIORITY,
173		.cra_blocksize	=	SHA256_BLOCK_SIZE,
174		.cra_module	=	THIS_MODULE,
175	}
176};
177
178static struct shash_alg sha224 = {
179	.digestsize	=	SHA224_DIGEST_SIZE,
180	.init		=	sha224_sparc64_init,
181	.update		=	sha256_sparc64_update,
182	.final		=	sha224_sparc64_final,
183	.descsize	=	sizeof(struct sha256_state),
184	.base		=	{
185		.cra_name	=	"sha224",
186		.cra_driver_name=	"sha224-sparc64",
187		.cra_priority	=	SPARC_CR_OPCODE_PRIORITY,
188		.cra_blocksize	=	SHA224_BLOCK_SIZE,
189		.cra_module	=	THIS_MODULE,
190	}
191};
192
193static bool __init sparc64_has_sha256_opcode(void)
194{
195	unsigned long cfr;
196
197	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
198		return false;
199
200	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
201	if (!(cfr & CFR_SHA256))
202		return false;
203
204	return true;
205}
206
207static int __init sha256_sparc64_mod_init(void)
208{
209	if (sparc64_has_sha256_opcode()) {
210		int ret = crypto_register_shash(&sha224);
211		if (ret < 0)
212			return ret;
213
214		ret = crypto_register_shash(&sha256);
215		if (ret < 0) {
216			crypto_unregister_shash(&sha224);
217			return ret;
218		}
219
220		pr_info("Using sparc64 sha256 opcode optimized SHA-256/SHA-224 implementation\n");
221		return 0;
222	}
223	pr_info("sparc64 sha256 opcode not available.\n");
224	return -ENODEV;
225}
226
227static void __exit sha256_sparc64_mod_fini(void)
228{
229	crypto_unregister_shash(&sha224);
230	crypto_unregister_shash(&sha256);
231}
232
233module_init(sha256_sparc64_mod_init);
234module_exit(sha256_sparc64_mod_fini);
235
236MODULE_LICENSE("GPL");
237MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm, sparc64 sha256 opcode accelerated");
238
239MODULE_ALIAS_CRYPTO("sha224");
240MODULE_ALIAS_CRYPTO("sha256");
241
242#include "crop_devid.c"