[deliverable/linux.git] / arch / arm / crypto / sha1-ce-glue.c

/*
 * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
 *
 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <crypto/internal/hash.h>
#include <crypto/sha.h>
#include <linux/crypto.h>
#include <linux/module.h>

#include <asm/crypto/sha1.h>
#include <asm/hwcap.h>
#include <asm/neon.h>
#include <asm/simd.h>
#include <asm/unaligned.h>

MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");

asmlinkage void sha1_ce_transform(int blocks, u8 const *src, u32 *state, 
				  u8 *head);

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;

	if (!may_use_simd())
		return sha1_update_arm(desc, data, len);

	partial = sctx->count % SHA1_BLOCK_SIZE;
	sctx->count += len;

	if ((partial + len) >= SHA1_BLOCK_SIZE) {
		int blocks;

		if (partial) {
			int p = SHA1_BLOCK_SIZE - partial;

			memcpy(sctx->buffer + partial, data, p);
			data += p;
			len -= p;
		}

		blocks = len / SHA1_BLOCK_SIZE;
		len %= SHA1_BLOCK_SIZE;

		kernel_neon_begin();
		sha1_ce_transform(blocks, data, sctx->state,
				  partial ? sctx->buffer : NULL);
		kernel_neon_end();

		data += blocks * SHA1_BLOCK_SIZE;
		partial = 0;
	}
	if (len)
		memcpy(sctx->buffer + partial, data, len);
	return 0;
}

static int sha1_final(struct shash_desc *desc, u8 *out)
{
	static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, };

	struct sha1_state *sctx = shash_desc_ctx(desc);
	__be64 bits = cpu_to_be64(sctx->count << 3);
	__be32 *dst = (__be32 *)out;
	int i;

	u32 padlen = SHA1_BLOCK_SIZE
		     - ((sctx->count + sizeof(bits)) % SHA1_BLOCK_SIZE);

	sha1_update(desc, padding, padlen);
	sha1_update(desc, (const u8 *)&bits, sizeof(bits));

	for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++)
		put_unaligned_be32(sctx->state[i], dst++);

	*sctx = (struct sha1_state){};
	return 0;
}

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

	*dst = *sctx;
	return 0;
}

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

	*sctx = *src;
	return 0;
}

static struct shash_alg alg = {
	.init			= sha1_init,
	.update			= sha1_update,
	.final			= sha1_final,
	.export			= sha1_export,
	.import			= sha1_import,
	.descsize		= sizeof(struct sha1_state),
	.digestsize		= SHA1_DIGEST_SIZE,
	.statesize		= sizeof(struct sha1_state),
	.base			= {
		.cra_name		= "sha1",
		.cra_driver_name	= "sha1-ce",
		.cra_priority		= 200,
		.cra_flags		= CRYPTO_ALG_TYPE_SHASH,
		.cra_blocksize		= SHA1_BLOCK_SIZE,
		.cra_module		= THIS_MODULE,
	}
};

static int __init sha1_ce_mod_init(void)
{
	if (!(elf_hwcap2 & HWCAP2_SHA1))
		return -ENODEV;
	return crypto_register_shash(&alg);
}

static void __exit sha1_ce_mod_fini(void)
{
	crypto_unregister_shash(&alg);
}

module_init(sha1_ce_mod_init);
module_exit(sha1_ce_mod_fini);
Commit	Line	Data
864cbeed AB	1	/*
	2	* sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
	3	*
	4	* Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#include <crypto/internal/hash.h>
	12	#include <crypto/sha.h>
	13	#include <linux/crypto.h>
	14	#include <linux/module.h>
	15
	16	#include <asm/crypto/sha1.h>
	17	#include <asm/hwcap.h>
	18	#include <asm/neon.h>
	19	#include <asm/simd.h>
	20	#include <asm/unaligned.h>
	21
	22	MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
	23	MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
	24	MODULE_LICENSE("GPL v2");
	25
	26	asmlinkage void sha1_ce_transform(int blocks, u8 const src, u32 state,
	27	u8 *head);
	28
	29	static int sha1_init(struct shash_desc *desc)
	30	{
	31	struct sha1_state *sctx = shash_desc_ctx(desc);
	32
	33	*sctx = (struct sha1_state){
	34	.state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
	35	};
	36	return 0;
	37	}
	38
	39	static int sha1_update(struct shash_desc desc, const u8 data,
	40	unsigned int len)
	41	{
	42	struct sha1_state *sctx = shash_desc_ctx(desc);
	43	unsigned int partial;
	44
	45	if (!may_use_simd())
	46	return sha1_update_arm(desc, data, len);
	47
	48	partial = sctx->count % SHA1_BLOCK_SIZE;
	49	sctx->count += len;
	50
	51	if ((partial + len) >= SHA1_BLOCK_SIZE) {
	52	int blocks;
	53
	54	if (partial) {
	55	int p = SHA1_BLOCK_SIZE - partial;
	56
	57	memcpy(sctx->buffer + partial, data, p);
	58	data += p;
	59	len -= p;
	60	}
	61
	62	blocks = len / SHA1_BLOCK_SIZE;
	63	len %= SHA1_BLOCK_SIZE;
	64
65	kernel_neon_begin();
66	sha1_ce_transform(blocks, data, sctx->state,
67	partial ? sctx->buffer : NULL);
68	kernel_neon_end();
69
70	data += blocks * SHA1_BLOCK_SIZE;
71	partial = 0;
72	}
73	if (len)
74	memcpy(sctx->buffer + partial, data, len);
75	return 0;
76	}
77
78	static int sha1_final(struct shash_desc desc, u8 out)
79	{
80	static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, };
81
82	struct sha1_state *sctx = shash_desc_ctx(desc);
83	__be64 bits = cpu_to_be64(sctx->count << 3);
84	__be32 dst = (__be32 )out;
85	int i;
86
87	u32 padlen = SHA1_BLOCK_SIZE
88	- ((sctx->count + sizeof(bits)) % SHA1_BLOCK_SIZE);
89
90	sha1_update(desc, padding, padlen);
91	sha1_update(desc, (const u8 *)&bits, sizeof(bits));
92
93	for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++)
94	put_unaligned_be32(sctx->state[i], dst++);
95
96	*sctx = (struct sha1_state){};
97	return 0;
98	}
99
100	static int sha1_export(struct shash_desc desc, void out)
101	{
102	struct sha1_state *sctx = shash_desc_ctx(desc);
103	struct sha1_state *dst = out;
104
105	dst = sctx;
106	return 0;
107	}
108
109	static int sha1_import(struct shash_desc desc, const void in)
110	{
111	struct sha1_state *sctx = shash_desc_ctx(desc);
112	struct sha1_state const *src = in;
113
114	sctx = src;
115	return 0;
116	}
117
118	static struct shash_alg alg = {
119	.init = sha1_init,
120	.update = sha1_update,
121	.final = sha1_final,
122	.export = sha1_export,
123	.import = sha1_import,
124	.descsize = sizeof(struct sha1_state),
125	.digestsize = SHA1_DIGEST_SIZE,
126	.statesize = sizeof(struct sha1_state),
127	.base = {
128	.cra_name = "sha1",
129	.cra_driver_name = "sha1-ce",
130	.cra_priority = 200,
131	.cra_flags = CRYPTO_ALG_TYPE_SHASH,
132	.cra_blocksize = SHA1_BLOCK_SIZE,
133	.cra_module = THIS_MODULE,
134	}
135	};
136
137	static int __init sha1_ce_mod_init(void)
138	{
139	if (!(elf_hwcap2 & HWCAP2_SHA1))
140	return -ENODEV;
141	return crypto_register_shash(&alg);
142	}
143
144	static void __exit sha1_ce_mod_fini(void)
145	{
146	crypto_unregister_shash(&alg);
147	}
148
149	module_init(sha1_ce_mod_init);
150	module_exit(sha1_ce_mod_fini);