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