Commit 7f9b0880 authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Herbert Xu
Browse files

crypto: blake2s - implement generic shash driver 



Wire up our newly added Blake2s implementation via the shash API.

Signed-off-by: default avatarArd Biesheuvel <ardb@kernel.org>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 17e1df67

crypto/Kconfig

+18 −0
Original line number Diff line number Diff line
@@ -656,6 +656,24 @@ config CRYPTO_BLAKE2B 


	  See https://blake2.net for further information.



config CRYPTO_BLAKE2S

	tristate "BLAKE2s digest algorithm"

	select CRYPTO_LIB_BLAKE2S_GENERIC

	select CRYPTO_HASH

	help

	  Implementation of cryptographic hash function BLAKE2s

	  optimized for 8-32bit platforms and can produce digests of any size

	  between 1 to 32.  The keyed hash is also implemented.



	  This module provides the following algorithms:



	  - blake2s-128

	  - blake2s-160

	  - blake2s-224

	  - blake2s-256



	  See https://blake2.net for further information.



config CRYPTO_CRCT10DIF

	tristate "CRCT10DIF algorithm"

	select CRYPTO_HASH

crypto/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -75,6 +75,7 @@ obj-$(CONFIG_CRYPTO_WP512) += wp512.o 
CFLAGS_wp512.o := $(call cc-option,-fno-schedule-insns)  # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79149

obj-$(CONFIG_CRYPTO_TGR192) += tgr192.o

obj-$(CONFIG_CRYPTO_BLAKE2B) += blake2b_generic.o

obj-$(CONFIG_CRYPTO_BLAKE2S) += blake2s_generic.o

obj-$(CONFIG_CRYPTO_GF128MUL) += gf128mul.o

obj-$(CONFIG_CRYPTO_ECB) += ecb.o

obj-$(CONFIG_CRYPTO_CBC) += cbc.o

crypto/blake2s_generic.c

0 → 100644
+171 −0
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// SPDX-License-Identifier: GPL-2.0 OR MIT

/*

 * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.

 */



#include <crypto/internal/blake2s.h>

#include <crypto/internal/simd.h>

#include <crypto/internal/hash.h>



#include <linux/types.h>

#include <linux/jump_label.h>

#include <linux/kernel.h>

#include <linux/module.h>



static int crypto_blake2s_setkey(struct crypto_shash *tfm, const u8 *key,

				 unsigned int keylen)

{

	struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(tfm);



	if (keylen == 0 || keylen > BLAKE2S_KEY_SIZE) {

		crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);

		return -EINVAL;

	}



	memcpy(tctx->key, key, keylen);

	tctx->keylen = keylen;



	return 0;

}



static int crypto_blake2s_init(struct shash_desc *desc)

{

	struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);

	struct blake2s_state *state = shash_desc_ctx(desc);

	const int outlen = crypto_shash_digestsize(desc->tfm);



	if (tctx->keylen)

		blake2s_init_key(state, outlen, tctx->key, tctx->keylen);

	else

		blake2s_init(state, outlen);



	return 0;

}



static int crypto_blake2s_update(struct shash_desc *desc, const u8 *in,

				 unsigned int inlen)

{

	struct blake2s_state *state = shash_desc_ctx(desc);

	const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;



	if (unlikely(!inlen))

		return 0;

	if (inlen > fill) {

		memcpy(state->buf + state->buflen, in, fill);

		blake2s_compress_generic(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);

		state->buflen = 0;

		in += fill;

		inlen -= fill;

	}

	if (inlen > BLAKE2S_BLOCK_SIZE) {

		const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);

		/* Hash one less (full) block than strictly possible */

		blake2s_compress_generic(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);

		in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);

		inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);

	}

	memcpy(state->buf + state->buflen, in, inlen);

	state->buflen += inlen;



	return 0;

}



static int crypto_blake2s_final(struct shash_desc *desc, u8 *out)

{

	struct blake2s_state *state = shash_desc_ctx(desc);



	blake2s_set_lastblock(state);

	memset(state->buf + state->buflen, 0,

	       BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */

	blake2s_compress_generic(state, state->buf, 1, state->buflen);

	cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));

	memcpy(out, state->h, state->outlen);

	memzero_explicit(state, sizeof(*state));



	return 0;

}



static struct shash_alg blake2s_algs[] = {{

	.base.cra_name		= "blake2s-128",

	.base.cra_driver_name	= "blake2s-128-generic",

	.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,

	.base.cra_ctxsize	= sizeof(struct blake2s_tfm_ctx),

	.base.cra_priority	= 200,

	.base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,

	.base.cra_module	= THIS_MODULE,



	.digestsize		= BLAKE2S_128_HASH_SIZE,

	.setkey			= crypto_blake2s_setkey,

	.init			= crypto_blake2s_init,

	.update			= crypto_blake2s_update,

	.final			= crypto_blake2s_final,

	.descsize		= sizeof(struct blake2s_state),

}, {

	.base.cra_name		= "blake2s-160",

	.base.cra_driver_name	= "blake2s-160-generic",

	.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,

	.base.cra_ctxsize	= sizeof(struct blake2s_tfm_ctx),

	.base.cra_priority	= 200,

	.base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,

	.base.cra_module	= THIS_MODULE,



	.digestsize		= BLAKE2S_160_HASH_SIZE,

	.setkey			= crypto_blake2s_setkey,

	.init			= crypto_blake2s_init,

	.update			= crypto_blake2s_update,

	.final			= crypto_blake2s_final,

	.descsize		= sizeof(struct blake2s_state),

}, {

	.base.cra_name		= "blake2s-224",

	.base.cra_driver_name	= "blake2s-224-generic",

	.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,

	.base.cra_ctxsize	= sizeof(struct blake2s_tfm_ctx),

	.base.cra_priority	= 200,

	.base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,

	.base.cra_module	= THIS_MODULE,



	.digestsize		= BLAKE2S_224_HASH_SIZE,

	.setkey			= crypto_blake2s_setkey,

	.init			= crypto_blake2s_init,

	.update			= crypto_blake2s_update,

	.final			= crypto_blake2s_final,

	.descsize		= sizeof(struct blake2s_state),

}, {

	.base.cra_name		= "blake2s-256",

	.base.cra_driver_name	= "blake2s-256-generic",

	.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,

	.base.cra_ctxsize	= sizeof(struct blake2s_tfm_ctx),

	.base.cra_priority	= 200,

	.base.cra_blocksize     = BLAKE2S_BLOCK_SIZE,

	.base.cra_module	= THIS_MODULE,



	.digestsize		= BLAKE2S_256_HASH_SIZE,

	.setkey			= crypto_blake2s_setkey,

	.init			= crypto_blake2s_init,

	.update			= crypto_blake2s_update,

	.final			= crypto_blake2s_final,

	.descsize		= sizeof(struct blake2s_state),

}};



static int __init blake2s_mod_init(void)

{

	return crypto_register_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));

}



static void __exit blake2s_mod_exit(void)

{

	crypto_unregister_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));

}



subsys_initcall(blake2s_mod_init);

module_exit(blake2s_mod_exit);



MODULE_ALIAS_CRYPTO("blake2s-128");

MODULE_ALIAS_CRYPTO("blake2s-128-generic");

MODULE_ALIAS_CRYPTO("blake2s-160");

MODULE_ALIAS_CRYPTO("blake2s-160-generic");

MODULE_ALIAS_CRYPTO("blake2s-224");

MODULE_ALIAS_CRYPTO("blake2s-224-generic");

MODULE_ALIAS_CRYPTO("blake2s-256");

MODULE_ALIAS_CRYPTO("blake2s-256-generic");

MODULE_LICENSE("GPL v2");

include/crypto/internal/blake2s.h

+5 −0
Original line number Diff line number Diff line
@@ -5,6 +5,11 @@ 


#include <crypto/blake2s.h>



struct blake2s_tfm_ctx {

	u8 key[BLAKE2S_KEY_SIZE];

	unsigned int keylen;

};



void blake2s_compress_generic(struct blake2s_state *state,const u8 *block,

			      size_t nblocks, const u32 inc);