[linux-2.6-block.git] / arch / powerpc / crypto / sha1.c

/*
 * Cryptographic API.
 *
 * powerpc implementation of the SHA1 Secure Hash Algorithm.
 *
 * Derived from cryptoapi implementation, adapted for in-place
 * scatterlist interface.
 *
 * Derived from "crypto/sha1.c"
 * Copyright (c) Alan Smithee.
 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */
#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/byteorder.h>

extern void powerpc_sha_transform(u32 *state, const u8 *src, u32 *temp);

static int sha1_init(struct shash_desc *desc)
{
	struct sha1_state *sctx = shash_desc_ctx(desc);

	*sctx = (struct sha1_state){
		.state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
	};

	return 0;
}

static int sha1_update(struct shash_desc *desc, const u8 *data,
			unsigned int len)
{
	struct sha1_state *sctx = shash_desc_ctx(desc);
	unsigned int partial, done;
	const u8 *src;

	partial = sctx->count & 0x3f;
	sctx->count += len;
	done = 0;
	src = data;

	if ((partial + len) > 63) {
		u32 temp[SHA_WORKSPACE_WORDS];

		if (partial) {
			done = -partial;
			memcpy(sctx->buffer + partial, data, done + 64);
			src = sctx->buffer;
		}

		do {
			powerpc_sha_transform(sctx->state, src, temp);
			done += 64;
			src = data + done;
		} while (done + 63 < len);

		memzero_explicit(temp, sizeof(temp));
		partial = 0;
	}
	memcpy(sctx->buffer + partial, src, len - done);

	return 0;
}


/* Add padding and return the message digest. */
static int sha1_final(struct shash_desc *desc, u8 *out)
{
	struct sha1_state *sctx = shash_desc_ctx(desc);
	__be32 *dst = (__be32 *)out;
	u32 i, index, padlen;
	__be64 bits;
	static const u8 padding[64] = { 0x80, };

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

	/* Pad out to 56 mod 64 */
	index = sctx->count & 0x3f;
	padlen = (index < 56) ? (56 - index) : ((64+56) - index);
	sha1_update(desc, padding, padlen);

	/* Append length */
	sha1_update(desc, (const u8 *)&bits, sizeof(bits));

	/* Store state in digest */
	for (i = 0; i < 5; i++)
		dst[i] = cpu_to_be32(sctx->state[i]);

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

	return 0;
}

static int sha1_export(struct shash_desc *desc, void *out)
{
	struct sha1_state *sctx = shash_desc_ctx(desc);

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

static int sha1_import(struct shash_desc *desc, const void *in)
{
	struct sha1_state *sctx = shash_desc_ctx(desc);

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

static struct shash_alg alg = {
	.digestsize	=	SHA1_DIGEST_SIZE,
	.init		=	sha1_init,
	.update		=	sha1_update,
	.final		=	sha1_final,
	.export		=	sha1_export,
	.import		=	sha1_import,
	.descsize	=	sizeof(struct sha1_state),
	.statesize	=	sizeof(struct sha1_state),
	.base		=	{
		.cra_name	=	"sha1",
		.cra_driver_name=	"sha1-powerpc",
		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
		.cra_blocksize	=	SHA1_BLOCK_SIZE,
		.cra_module	=	THIS_MODULE,
	}
};

static int __init sha1_powerpc_mod_init(void)
{
	return crypto_register_shash(&alg);
}

static void __exit sha1_powerpc_mod_fini(void)
{
	crypto_unregister_shash(&alg);
}

module_init(sha1_powerpc_mod_init);
module_exit(sha1_powerpc_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");

MODULE_ALIAS_CRYPTO("sha1");
MODULE_ALIAS_CRYPTO("sha1-powerpc");
Commit	Line	Data
323a6bf1 ME	1	/*
	2	* Cryptographic API.
	3	*
	4	* powerpc implementation of the SHA1 Secure Hash Algorithm.
	5	*
	6	* Derived from cryptoapi implementation, adapted for in-place
	7	* scatterlist interface.
	8	*
	9	* Derived from "crypto/sha1.c"
	10	* Copyright (c) Alan Smithee.
	11	* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
	12	* Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
	13	*
	14	* This program is free software; you can redistribute it and/or modify it
	15	* under the terms of the GNU General Public License as published by the Free
	16	* Software Foundation; either version 2 of the License, or (at your option)
	17	* any later version.
	18	*
	19	*/
	20	#include <crypto/internal/hash.h>
	21	#include <linux/init.h>
	22	#include <linux/module.h>
	23	#include <linux/mm.h>
	24	#include <linux/cryptohash.h>
	25	#include <linux/types.h>
	26	#include <crypto/sha.h>
	27	#include <asm/byteorder.h>
	28
	29	extern void powerpc_sha_transform(u32 state, const u8 src, u32 *temp);
	30
	31	static int sha1_init(struct shash_desc *desc)
	32	{
	33	struct sha1_state *sctx = shash_desc_ctx(desc);
	34
	35	*sctx = (struct sha1_state){
	36	.state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
	37	};
	38
	39	return 0;
	40	}
	41
	42	static int sha1_update(struct shash_desc desc, const u8 data,
	43	unsigned int len)
	44	{
	45	struct sha1_state *sctx = shash_desc_ctx(desc);
	46	unsigned int partial, done;
	47	const u8 *src;
	48
	49	partial = sctx->count & 0x3f;
	50	sctx->count += len;
	51	done = 0;
	52	src = data;
	53
	54	if ((partial + len) > 63) {
	55	u32 temp[SHA_WORKSPACE_WORDS];
	56
	57	if (partial) {
	58	done = -partial;
	59	memcpy(sctx->buffer + partial, data, done + 64);
	60	src = sctx->buffer;
	61	}
	62
	63	do {
	64	powerpc_sha_transform(sctx->state, src, temp);
65	done += 64;
66	src = data + done;
67	} while (done + 63 < len);
68
d83480b0	69	memzero_explicit(temp, sizeof(temp));
323a6bf1 ME	70	partial = 0;
	71	}
	72	memcpy(sctx->buffer + partial, src, len - done);
	73
	74	return 0;
	75	}
	76
	77
	78	/* Add padding and return the message digest. */
	79	static int sha1_final(struct shash_desc desc, u8 out)
	80	{
	81	struct sha1_state *sctx = shash_desc_ctx(desc);
	82	__be32 dst = (__be32 )out;
	83	u32 i, index, padlen;
	84	__be64 bits;
	85	static const u8 padding[64] = { 0x80, };
	86
	87	bits = cpu_to_be64(sctx->count << 3);
	88
	89	/* Pad out to 56 mod 64 */
	90	index = sctx->count & 0x3f;
	91	padlen = (index < 56) ? (56 - index) : ((64+56) - index);
	92	sha1_update(desc, padding, padlen);
	93
	94	/* Append length */
	95	sha1_update(desc, (const u8 *)&bits, sizeof(bits));
	96
	97	/* Store state in digest */
	98	for (i = 0; i < 5; i++)
	99	dst[i] = cpu_to_be32(sctx->state[i]);
	100
	101	/* Wipe context */
	102	memset(sctx, 0, sizeof *sctx);
	103
	104	return 0;
	105	}
	106
	107	static int sha1_export(struct shash_desc desc, void out)
	108	{
	109	struct sha1_state *sctx = shash_desc_ctx(desc);
	110
	111	memcpy(out, sctx, sizeof(*sctx));
	112	return 0;
	113	}
	114
	115	static int sha1_import(struct shash_desc desc, const void in)
	116	{
	117	struct sha1_state *sctx = shash_desc_ctx(desc);
	118
	119	memcpy(sctx, in, sizeof(*sctx));
	120	return 0;
	121	}
	122
	123	static struct shash_alg alg = {
	124	.digestsize = SHA1_DIGEST_SIZE,
	125	.init = sha1_init,
	126	.update = sha1_update,
	127	.final = sha1_final,
	128	.export = sha1_export,
	129	.import = sha1_import,
	130	.descsize = sizeof(struct sha1_state),
	131	.statesize = sizeof(struct sha1_state),
	132	.base = {
	133	.cra_name = "sha1",
134	.cra_driver_name= "sha1-powerpc",
135	.cra_flags = CRYPTO_ALG_TYPE_SHASH,
136	.cra_blocksize = SHA1_BLOCK_SIZE,
137	.cra_module = THIS_MODULE,
138	}
139	};
140
141	static int __init sha1_powerpc_mod_init(void)
142	{
143	return crypto_register_shash(&alg);
144	}
145
146	static void __exit sha1_powerpc_mod_fini(void)
147	{
148	crypto_unregister_shash(&alg);
149	}
150
151	module_init(sha1_powerpc_mod_init);
152	module_exit(sha1_powerpc_mod_fini);
153
154	MODULE_LICENSE("GPL");
155	MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
156
3e14dcf7	157	MODULE_ALIAS_CRYPTO("sha1");
5d26a105	158	MODULE_ALIAS_CRYPTO("sha1-powerpc");