brintos

brintos / linux-shallow public Read only

0
0
Text · 5.9 KiB · 04a712d Raw
188 lines · c
1// SPDX-License-Identifier: (GPL-2.0-only OR Apache-2.0)2/*3 * Generic implementation of the BLAKE2b digest algorithm.  Based on the BLAKE2b4 * reference implementation, but it has been heavily modified for use in the5 * kernel.  The reference implementation was:6 *7 *	Copyright 2012, Samuel Neves <sneves@dei.uc.pt>.  You may use this under8 *	the terms of the CC0, the OpenSSL Licence, or the Apache Public License9 *	2.0, at your option.  The terms of these licenses can be found at:10 *11 *	- CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.012 *	- OpenSSL license   : https://www.openssl.org/source/license.html13 *	- Apache 2.0        : https://www.apache.org/licenses/LICENSE-2.014 *15 * More information about BLAKE2 can be found at https://blake2.net.16 */17 18#include <linux/unaligned.h>19#include <linux/module.h>20#include <linux/kernel.h>21#include <linux/bitops.h>22#include <crypto/internal/blake2b.h>23#include <crypto/internal/hash.h>24 25static 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 40static 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 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 70static void blake2b_compress_one_generic(struct blake2b_state *S,71					 const u8 block[BLAKE2B_BLOCK_SIZE])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 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];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);104#ifdef CONFIG_CC_IS_CLANG105#pragma nounroll /* https://llvm.org/pr45803 */106#endif107	for (i = 0; i < 8; ++i)108		S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];109}110 111#undef G112#undef ROUND113 114void blake2b_compress_generic(struct blake2b_state *state,115			      const u8 *block, size_t nblocks, u32 inc)116{117	do {118		blake2b_increment_counter(state, inc);119		blake2b_compress_one_generic(state, block);120		block += BLAKE2B_BLOCK_SIZE;121	} while (--nblocks);122}123EXPORT_SYMBOL(blake2b_compress_generic);124 125static int crypto_blake2b_update_generic(struct shash_desc *desc,126					 const u8 *in, unsigned int inlen)127{128	return crypto_blake2b_update(desc, in, inlen, blake2b_compress_generic);129}130 131static int crypto_blake2b_final_generic(struct shash_desc *desc, u8 *out)132{133	return crypto_blake2b_final(desc, out, blake2b_compress_generic);134}135 136#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	}152 153static struct shash_alg blake2b_algs[] = {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),162};163 164static int __init blake2b_mod_init(void)165{166	return crypto_register_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));167}168 169static void __exit blake2b_mod_fini(void)170{171	crypto_unregister_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));172}173 174subsys_initcall(blake2b_mod_init);175module_exit(blake2b_mod_fini);176 177MODULE_AUTHOR("David Sterba <kdave@kernel.org>");178MODULE_DESCRIPTION("BLAKE2b generic implementation");179MODULE_LICENSE("GPL");180MODULE_ALIAS_CRYPTO("blake2b-160");181MODULE_ALIAS_CRYPTO("blake2b-160-generic");182MODULE_ALIAS_CRYPTO("blake2b-256");183MODULE_ALIAS_CRYPTO("blake2b-256-generic");184MODULE_ALIAS_CRYPTO("blake2b-384");185MODULE_ALIAS_CRYPTO("blake2b-384-generic");186MODULE_ALIAS_CRYPTO("blake2b-512");187MODULE_ALIAS_CRYPTO("blake2b-512-generic");188