[deliverable/linux.git] / arch / sparc / crypto / sha256_glue.c

/* Glue code for SHA256 hashing optimized for sparc64 crypto opcodes.
 *
 * This is based largely upon crypto/sha256_generic.c
 *
 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
 * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
 */

#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt

#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/cryptohash.h>
#include <linux/types.h>
#include <crypto/sha.h>

#include <asm/pstate.h>
#include <asm/elf.h>

#include "opcodes.h"

asmlinkage void sha256_sparc64_transform(u32 *digest, const char *data,
					 unsigned int rounds);

static int sha224_sparc64_init(struct shash_desc *desc)
{
	struct sha256_state *sctx = shash_desc_ctx(desc);
	sctx->state[0] = SHA224_H0;
	sctx->state[1] = SHA224_H1;
	sctx->state[2] = SHA224_H2;
	sctx->state[3] = SHA224_H3;
	sctx->state[4] = SHA224_H4;
	sctx->state[5] = SHA224_H5;
	sctx->state[6] = SHA224_H6;
	sctx->state[7] = SHA224_H7;
	sctx->count = 0;

	return 0;
}

static int sha256_sparc64_init(struct shash_desc *desc)
{
	struct sha256_state *sctx = shash_desc_ctx(desc);
	sctx->state[0] = SHA256_H0;
	sctx->state[1] = SHA256_H1;
	sctx->state[2] = SHA256_H2;
	sctx->state[3] = SHA256_H3;
	sctx->state[4] = SHA256_H4;
	sctx->state[5] = SHA256_H5;
	sctx->state[6] = SHA256_H6;
	sctx->state[7] = SHA256_H7;
	sctx->count = 0;

	return 0;
}

static void __sha256_sparc64_update(struct sha256_state *sctx, const u8 *data,
				    unsigned int len, unsigned int partial)
{
	unsigned int done = 0;

	sctx->count += len;
	if (partial) {
		done = SHA256_BLOCK_SIZE - partial;
		memcpy(sctx->buf + partial, data, done);
		sha256_sparc64_transform(sctx->state, sctx->buf, 1);
	}
	if (len - done >= SHA256_BLOCK_SIZE) {
		const unsigned int rounds = (len - done) / SHA256_BLOCK_SIZE;

		sha256_sparc64_transform(sctx->state, data + done, rounds);
		done += rounds * SHA256_BLOCK_SIZE;
	}

	memcpy(sctx->buf, data + done, len - done);
}

static int sha256_sparc64_update(struct shash_desc *desc, const u8 *data,
				 unsigned int len)
{
	struct sha256_state *sctx = shash_desc_ctx(desc);
	unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;

	/* Handle the fast case right here */
	if (partial + len < SHA256_BLOCK_SIZE) {
		sctx->count += len;
		memcpy(sctx->buf + partial, data, len);
	} else
		__sha256_sparc64_update(sctx, data, len, partial);

	return 0;
}

static int sha256_sparc64_final(struct shash_desc *desc, u8 *out)
{
	struct sha256_state *sctx = shash_desc_ctx(desc);
	unsigned int i, index, padlen;
	__be32 *dst = (__be32 *)out;
	__be64 bits;
	static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, };

	bits = cpu_to_be64(sctx->count << 3);

	/* Pad out to 56 mod 64 and append length */
	index = sctx->count % SHA256_BLOCK_SIZE;
	padlen = (index < 56) ? (56 - index) : ((SHA256_BLOCK_SIZE+56) - index);

	/* We need to fill a whole block for __sha256_sparc64_update() */
	if (padlen <= 56) {
		sctx->count += padlen;
		memcpy(sctx->buf + index, padding, padlen);
	} else {
		__sha256_sparc64_update(sctx, padding, padlen, index);
	}
	__sha256_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);

	/* Store state in digest */
	for (i = 0; i < 8; i++)
		dst[i] = cpu_to_be32(sctx->state[i]);

	/* Wipe context */
	memset(sctx, 0, sizeof(*sctx));

	return 0;
}

static int sha224_sparc64_final(struct shash_desc *desc, u8 *hash)
{
	u8 D[SHA256_DIGEST_SIZE];

	sha256_sparc64_final(desc, D);

	memcpy(hash, D, SHA224_DIGEST_SIZE);
	memzero_explicit(D, SHA256_DIGEST_SIZE);

	return 0;
}

static int sha256_sparc64_export(struct shash_desc *desc, void *out)
{
	struct sha256_state *sctx = shash_desc_ctx(desc);

	memcpy(out, sctx, sizeof(*sctx));
	return 0;
}

static int sha256_sparc64_import(struct shash_desc *desc, const void *in)
{
	struct sha256_state *sctx = shash_desc_ctx(desc);

	memcpy(sctx, in, sizeof(*sctx));
	return 0;
}

static struct shash_alg sha256 = {
	.digestsize	=	SHA256_DIGEST_SIZE,
	.init		=	sha256_sparc64_init,
	.update		=	sha256_sparc64_update,
	.final		=	sha256_sparc64_final,
	.export		=	sha256_sparc64_export,
	.import		=	sha256_sparc64_import,
	.descsize	=	sizeof(struct sha256_state),
	.statesize	=	sizeof(struct sha256_state),
	.base		=	{
		.cra_name	=	"sha256",
		.cra_driver_name=	"sha256-sparc64",
		.cra_priority	=	SPARC_CR_OPCODE_PRIORITY,
		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
		.cra_blocksize	=	SHA256_BLOCK_SIZE,
		.cra_module	=	THIS_MODULE,
	}
};

static struct shash_alg sha224 = {
	.digestsize	=	SHA224_DIGEST_SIZE,
	.init		=	sha224_sparc64_init,
	.update		=	sha256_sparc64_update,
	.final		=	sha224_sparc64_final,
	.descsize	=	sizeof(struct sha256_state),
	.base		=	{
		.cra_name	=	"sha224",
		.cra_driver_name=	"sha224-sparc64",
		.cra_priority	=	SPARC_CR_OPCODE_PRIORITY,
		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
		.cra_blocksize	=	SHA224_BLOCK_SIZE,
		.cra_module	=	THIS_MODULE,
	}
};

static bool __init sparc64_has_sha256_opcode(void)
{
	unsigned long cfr;

	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
		return false;

	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
	if (!(cfr & CFR_SHA256))
		return false;

	return true;
}

static int __init sha256_sparc64_mod_init(void)
{
	if (sparc64_has_sha256_opcode()) {
		int ret = crypto_register_shash(&sha224);
		if (ret < 0)
			return ret;

		ret = crypto_register_shash(&sha256);
		if (ret < 0) {
			crypto_unregister_shash(&sha224);
			return ret;
		}

		pr_info("Using sparc64 sha256 opcode optimized SHA-256/SHA-224 implementation\n");
		return 0;
	}
	pr_info("sparc64 sha256 opcode not available.\n");
	return -ENODEV;
}

static void __exit sha256_sparc64_mod_fini(void)
{
	crypto_unregister_shash(&sha224);
	crypto_unregister_shash(&sha256);
}

module_init(sha256_sparc64_mod_init);
module_exit(sha256_sparc64_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm, sparc64 sha256 opcode accelerated");

MODULE_ALIAS_CRYPTO("sha224");
MODULE_ALIAS_CRYPTO("sha256");

#include "crop_devid.c"
Commit	Line	Data
86c93b24 DM	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
10803624 DM	24	#include "opcodes.h"
10803624 DM	25
86c93b24 DM	26	asmlinkage void sha256_sparc64_transform(u32 digest, const char data,
	27	unsigned int rounds);
	28
	29	static 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
	45	static 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
	61	static 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
	82	static 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
98	static 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
131	static 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);
8202cd72	138	memzero_explicit(D, SHA256_DIGEST_SIZE);
86c93b24 DM	139
	140	return 0;
	141	}
	142
	143	static 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
	151	static 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
	159	static 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",
10803624	171	.cra_priority = SPARC_CR_OPCODE_PRIORITY,
86c93b24 DM	172	.cra_flags = CRYPTO_ALG_TYPE_SHASH,
	173	.cra_blocksize = SHA256_BLOCK_SIZE,
	174	.cra_module = THIS_MODULE,
	175	}
	176	};
	177
	178	static 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",
10803624	187	.cra_priority = SPARC_CR_OPCODE_PRIORITY,
86c93b24 DM	188	.cra_flags = CRYPTO_ALG_TYPE_SHASH,
	189	.cra_blocksize = SHA224_BLOCK_SIZE,
	190	.cra_module = THIS_MODULE,
	191	}
	192	};
	193
	194	static 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
	208	static 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
	228	static void __exit sha256_sparc64_mod_fini(void)
	229	{
	230	crypto_unregister_shash(&sha224);
	231	crypto_unregister_shash(&sha256);
	232	}
	233
	234	module_init(sha256_sparc64_mod_init);
	235	module_exit(sha256_sparc64_mod_fini);
	236
	237	MODULE_LICENSE("GPL");
	238	MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm, sparc64 sha256 opcode accelerated");
	239
5d26a105 KC	240	MODULE_ALIAS_CRYPTO("sha224");
5d26a105 KC	241	MODULE_ALIAS_CRYPTO("sha256");
226f7cea DM	242
226f7cea DM	243	#include "crop_devid.c"