[linux.git] / crypto / blake2b_generic.c

// SPDX-License-Identifier: (GPL-2.0-only OR Apache-2.0)
/*
 * Generic implementation of the BLAKE2b digest algorithm.  Based on the BLAKE2b
 * reference implementation, but it has been heavily modified for use in the
 * kernel.  The reference implementation was:
 *
 *	Copyright 2012, Samuel Neves <[email protected]>.  You may use this under
 *	the terms of the CC0, the OpenSSL Licence, or the Apache Public License
 *	2.0, at your option.  The terms of these licenses can be found at:
 *
 *	- CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
 *	- OpenSSL license   : https://www.openssl.org/source/license.html
 *	- Apache 2.0        : https://www.apache.org/licenses/LICENSE-2.0
 *
 * More information about BLAKE2 can be found at https://blake2.net.
 */

#include <asm/unaligned.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/bitops.h>
#include <crypto/internal/blake2b.h>
#include <crypto/internal/hash.h>

static const u8 blake2b_sigma[12][16] = {
	{  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15 },
	{ 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3 },
	{ 11,  8, 12,  0,  5,  2, 15, 13, 10, 14,  3,  6,  7,  1,  9,  4 },
	{  7,  9,  3,  1, 13, 12, 11, 14,  2,  6,  5, 10,  4,  0, 15,  8 },
	{  9,  0,  5,  7,  2,  4, 10, 15, 14,  1, 11, 12,  6,  8,  3, 13 },
	{  2, 12,  6, 10,  0, 11,  8,  3,  4, 13,  7,  5, 15, 14,  1,  9 },
	{ 12,  5,  1, 15, 14, 13,  4, 10,  0,  7,  6,  3,  9,  2,  8, 11 },
	{ 13, 11,  7, 14, 12,  1,  3,  9,  5,  0, 15,  4,  8,  6,  2, 10 },
	{  6, 15, 14,  9, 11,  3,  0,  8, 12,  2, 13,  7,  1,  4, 10,  5 },
	{ 10,  2,  8,  4,  7,  6,  1,  5, 15, 11,  9, 14,  3, 12, 13,  0 },
	{  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15 },
	{ 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3 }
};

static void blake2b_increment_counter(struct blake2b_state *S, const u64 inc)
{
	S->t[0] += inc;
	S->t[1] += (S->t[0] < inc);
}

#define G(r,i,a,b,c,d)                                  \
	do {                                            \
		a = a + b + m[blake2b_sigma[r][2*i+0]]; \
		d = ror64(d ^ a, 32);                   \
		c = c + d;                              \
		b = ror64(b ^ c, 24);                   \
		a = a + b + m[blake2b_sigma[r][2*i+1]]; \
		d = ror64(d ^ a, 16);                   \
		c = c + d;                              \
		b = ror64(b ^ c, 63);                   \
	} while (0)

#define ROUND(r)                                \
	do {                                    \
		G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
		G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
		G(r,2,v[ 2],v[ 6],v[10],v[14]); \
		G(r,3,v[ 3],v[ 7],v[11],v[15]); \
		G(r,4,v[ 0],v[ 5],v[10],v[15]); \
		G(r,5,v[ 1],v[ 6],v[11],v[12]); \
		G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
		G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
	} while (0)

static void blake2b_compress_one_generic(struct blake2b_state *S,
					 const u8 block[BLAKE2B_BLOCK_SIZE])
{
	u64 m[16];
	u64 v[16];
	size_t i;

	for (i = 0; i < 16; ++i)
		m[i] = get_unaligned_le64(block + i * sizeof(m[i]));

	for (i = 0; i < 8; ++i)
		v[i] = S->h[i];

	v[ 8] = BLAKE2B_IV0;
	v[ 9] = BLAKE2B_IV1;
	v[10] = BLAKE2B_IV2;
	v[11] = BLAKE2B_IV3;
	v[12] = BLAKE2B_IV4 ^ S->t[0];
	v[13] = BLAKE2B_IV5 ^ S->t[1];
	v[14] = BLAKE2B_IV6 ^ S->f[0];
	v[15] = BLAKE2B_IV7 ^ S->f[1];

	ROUND(0);
	ROUND(1);
	ROUND(2);
	ROUND(3);
	ROUND(4);
	ROUND(5);
	ROUND(6);
	ROUND(7);
	ROUND(8);
	ROUND(9);
	ROUND(10);
	ROUND(11);
#ifdef CONFIG_CC_IS_CLANG
#pragma nounroll /* https://llvm.org/pr45803 */
#endif
	for (i = 0; i < 8; ++i)
		S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
}

#undef G
#undef ROUND

void blake2b_compress_generic(struct blake2b_state *state,
			      const u8 *block, size_t nblocks, u32 inc)
{
	do {
		blake2b_increment_counter(state, inc);
		blake2b_compress_one_generic(state, block);
		block += BLAKE2B_BLOCK_SIZE;
	} while (--nblocks);
}
EXPORT_SYMBOL(blake2b_compress_generic);

static int crypto_blake2b_update_generic(struct shash_desc *desc,
					 const u8 *in, unsigned int inlen)
{
	return crypto_blake2b_update(desc, in, inlen, blake2b_compress_generic);
}

static int crypto_blake2b_final_generic(struct shash_desc *desc, u8 *out)
{
	return crypto_blake2b_final(desc, out, blake2b_compress_generic);
}

#define BLAKE2B_ALG(name, driver_name, digest_size)			\
	{								\
		.base.cra_name		= name,				\
		.base.cra_driver_name	= driver_name,			\
		.base.cra_priority	= 100,				\
		.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,	\
		.base.cra_blocksize	= BLAKE2B_BLOCK_SIZE,		\
		.base.cra_ctxsize	= sizeof(struct blake2b_tfm_ctx), \
		.base.cra_module	= THIS_MODULE,			\
		.digestsize		= digest_size,			\
		.setkey			= crypto_blake2b_setkey,	\
		.init			= crypto_blake2b_init,		\
		.update			= crypto_blake2b_update_generic, \
		.final			= crypto_blake2b_final_generic,	\
		.descsize		= sizeof(struct blake2b_state),	\
	}

static struct shash_alg blake2b_algs[] = {
	BLAKE2B_ALG("blake2b-160", "blake2b-160-generic",
		    BLAKE2B_160_HASH_SIZE),
	BLAKE2B_ALG("blake2b-256", "blake2b-256-generic",
		    BLAKE2B_256_HASH_SIZE),
	BLAKE2B_ALG("blake2b-384", "blake2b-384-generic",
		    BLAKE2B_384_HASH_SIZE),
	BLAKE2B_ALG("blake2b-512", "blake2b-512-generic",
		    BLAKE2B_512_HASH_SIZE),
};

static int __init blake2b_mod_init(void)
{
	return crypto_register_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
}

static void __exit blake2b_mod_fini(void)
{
	crypto_unregister_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
}

subsys_initcall(blake2b_mod_init);
module_exit(blake2b_mod_fini);

MODULE_AUTHOR("David Sterba <[email protected]>");
MODULE_DESCRIPTION("BLAKE2b generic implementation");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("blake2b-160");
MODULE_ALIAS_CRYPTO("blake2b-160-generic");
MODULE_ALIAS_CRYPTO("blake2b-256");
MODULE_ALIAS_CRYPTO("blake2b-256-generic");
MODULE_ALIAS_CRYPTO("blake2b-384");
MODULE_ALIAS_CRYPTO("blake2b-384-generic");
MODULE_ALIAS_CRYPTO("blake2b-512");
MODULE_ALIAS_CRYPTO("blake2b-512-generic");
Commit	Line	Data
91d68933 DS	1	// SPDX-License-Identifier: (GPL-2.0-only OR Apache-2.0)
91d68933 DS	2	/*
0cdc438e EB	3	* Generic implementation of the BLAKE2b digest algorithm. Based on the BLAKE2b
	4	* reference implementation, but it has been heavily modified for use in the
	5	* kernel. The reference implementation was:
91d68933	6	*
0cdc438e EB	7	* Copyright 2012, Samuel Neves <[email protected]>. You may use this under
	8	* the terms of the CC0, the OpenSSL Licence, or the Apache Public License
	9	* 2.0, at your option. The terms of these licenses can be found at:
91d68933	10	*
0cdc438e EB	11	* - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
	12	* - OpenSSL license : https://www.openssl.org/source/license.html
	13	* - Apache 2.0 : https://www.apache.org/licenses/LICENSE-2.0
91d68933	14	*
0cdc438e	15	* More information about BLAKE2 can be found at https://blake2.net.
91d68933 DS	16	*/
	17
	18	#include <asm/unaligned.h>
	19	#include <linux/module.h>
91d68933 DS	20	#include <linux/kernel.h>
91d68933 DS	21	#include <linux/bitops.h>
28dcca4c	22	#include <crypto/internal/blake2b.h>
91d68933 DS	23	#include <crypto/internal/hash.h>
91d68933 DS	24
91d68933 DS	25	static const u8 blake2b_sigma[12][16] = {
	26	{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
	27	{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 },
	28	{ 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 },
	29	{ 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 },
	30	{ 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 },
	31	{ 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 },
	32	{ 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 },
	33	{ 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 },
	34	{ 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 },
	35	{ 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 },
	36	{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
	37	{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 }
	38	};
	39
91d68933 DS	40	static void blake2b_increment_counter(struct blake2b_state *S, const u64 inc)
	41	{
	42	S->t[0] += inc;
	43	S->t[1] += (S->t[0] < inc);
	44	}
	45
91d68933 DS	46	#define G(r,i,a,b,c,d) \
	47	do { \
	48	a = a + b + m[blake2b_sigma[r][2*i+0]]; \
	49	d = ror64(d ^ a, 32); \
	50	c = c + d; \
	51	b = ror64(b ^ c, 24); \
	52	a = a + b + m[blake2b_sigma[r][2*i+1]]; \
	53	d = ror64(d ^ a, 16); \
	54	c = c + d; \
	55	b = ror64(b ^ c, 63); \
	56	} while (0)
	57
	58	#define ROUND(r) \
	59	do { \
	60	G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
	61	G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
	62	G(r,2,v[ 2],v[ 6],v[10],v[14]); \
	63	G(r,3,v[ 3],v[ 7],v[11],v[15]); \
	64	G(r,4,v[ 0],v[ 5],v[10],v[15]); \
	65	G(r,5,v[ 1],v[ 6],v[11],v[12]); \
	66	G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
	67	G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
	68	} while (0)
	69
28dcca4c EB	70	static void blake2b_compress_one_generic(struct blake2b_state *S,
28dcca4c EB	71	const u8 block[BLAKE2B_BLOCK_SIZE])
91d68933 DS	72	{
	73	u64 m[16];
	74	u64 v[16];
	75	size_t i;
	76
	77	for (i = 0; i < 16; ++i)
	78	m[i] = get_unaligned_le64(block + i * sizeof(m[i]));
	79
	80	for (i = 0; i < 8; ++i)
	81	v[i] = S->h[i];
	82
28dcca4c EB	83	v[ 8] = BLAKE2B_IV0;
	84	v[ 9] = BLAKE2B_IV1;
	85	v[10] = BLAKE2B_IV2;
	86	v[11] = BLAKE2B_IV3;
	87	v[12] = BLAKE2B_IV4 ^ S->t[0];
	88	v[13] = BLAKE2B_IV5 ^ S->t[1];
	89	v[14] = BLAKE2B_IV6 ^ S->f[0];
	90	v[15] = BLAKE2B_IV7 ^ S->f[1];
91d68933 DS	91
	92	ROUND(0);
	93	ROUND(1);
	94	ROUND(2);
	95	ROUND(3);
	96	ROUND(4);
	97	ROUND(5);
	98	ROUND(6);
	99	ROUND(7);
	100	ROUND(8);
	101	ROUND(9);
	102	ROUND(10);
	103	ROUND(11);
0c0408e8	104	#ifdef CONFIG_CC_IS_CLANG
2947a456	105	#pragma nounroll /* https://llvm.org/pr45803 */
0c0408e8	106	#endif
91d68933 DS	107	for (i = 0; i < 8; ++i)
	108	S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
	109	}
	110
	111	#undef G
	112	#undef ROUND
	113
28dcca4c EB	114	void blake2b_compress_generic(struct blake2b_state *state,
28dcca4c EB	115	const u8 *block, size_t nblocks, u32 inc)
91d68933	116	{
28dcca4c EB	117	do {
	118	blake2b_increment_counter(state, inc);
	119	blake2b_compress_one_generic(state, block);
	120	block += BLAKE2B_BLOCK_SIZE;
	121	} while (--nblocks);
91d68933	122	}
28dcca4c	123	EXPORT_SYMBOL(blake2b_compress_generic);
91d68933	124
28dcca4c EB	125	static int crypto_blake2b_update_generic(struct shash_desc *desc,
28dcca4c EB	126	const u8 *in, unsigned int inlen)
91d68933	127	{
28dcca4c	128	return crypto_blake2b_update(desc, in, inlen, blake2b_compress_generic);
91d68933 DS	129	}
91d68933 DS	130
28dcca4c	131	static int crypto_blake2b_final_generic(struct shash_desc desc, u8 out)
91d68933	132	{
28dcca4c	133	return crypto_blake2b_final(desc, out, blake2b_compress_generic);
91d68933 DS	134	}
91d68933 DS	135
28dcca4c EB	136	#define BLAKE2B_ALG(name, driver_name, digest_size) \
	137	{ \
	138	.base.cra_name = name, \
	139	.base.cra_driver_name = driver_name, \
	140	.base.cra_priority = 100, \
	141	.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, \
	142	.base.cra_blocksize = BLAKE2B_BLOCK_SIZE, \
	143	.base.cra_ctxsize = sizeof(struct blake2b_tfm_ctx), \
	144	.base.cra_module = THIS_MODULE, \
	145	.digestsize = digest_size, \
	146	.setkey = crypto_blake2b_setkey, \
	147	.init = crypto_blake2b_init, \
	148	.update = crypto_blake2b_update_generic, \
	149	.final = crypto_blake2b_final_generic, \
	150	.descsize = sizeof(struct blake2b_state), \
	151	}
91d68933 DS	152
91d68933 DS	153	static struct shash_alg blake2b_algs[] = {
28dcca4c EB	154	BLAKE2B_ALG("blake2b-160", "blake2b-160-generic",
	155	BLAKE2B_160_HASH_SIZE),
	156	BLAKE2B_ALG("blake2b-256", "blake2b-256-generic",
	157	BLAKE2B_256_HASH_SIZE),
	158	BLAKE2B_ALG("blake2b-384", "blake2b-384-generic",
	159	BLAKE2B_384_HASH_SIZE),
	160	BLAKE2B_ALG("blake2b-512", "blake2b-512-generic",
	161	BLAKE2B_512_HASH_SIZE),
91d68933 DS	162	};
	163
	164	static int __init blake2b_mod_init(void)
	165	{
91d68933 DS	166	return crypto_register_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
	167	}
	168
	169	static void __exit blake2b_mod_fini(void)
	170	{
	171	crypto_unregister_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
	172	}
	173
	174	subsys_initcall(blake2b_mod_init);
	175	module_exit(blake2b_mod_fini);
	176
	177	MODULE_AUTHOR("David Sterba <[email protected]>");
	178	MODULE_DESCRIPTION("BLAKE2b generic implementation");
	179	MODULE_LICENSE("GPL");
	180	MODULE_ALIAS_CRYPTO("blake2b-160");
	181	MODULE_ALIAS_CRYPTO("blake2b-160-generic");
	182	MODULE_ALIAS_CRYPTO("blake2b-256");
	183	MODULE_ALIAS_CRYPTO("blake2b-256-generic");
	184	MODULE_ALIAS_CRYPTO("blake2b-384");
	185	MODULE_ALIAS_CRYPTO("blake2b-384-generic");
	186	MODULE_ALIAS_CRYPTO("blake2b-512");
	187	MODULE_ALIAS_CRYPTO("blake2b-512-generic");