[linux-block.git] / lib / crypto / blake2s.c

// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
 * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
 *
 * This is an implementation of the BLAKE2s hash and PRF functions.
 *
 * Information: https://blake2.net/
 *
 */

#include <crypto/internal/blake2s.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/bug.h>

static inline void blake2s_set_lastblock(struct blake2s_state *state)
{
	state->f[0] = -1;
}

void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen)
{
	const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;

	if (unlikely(!inlen))
		return;
	if (inlen > fill) {
		memcpy(state->buf + state->buflen, in, fill);
		blake2s_compress(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);
		blake2s_compress(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;
}
EXPORT_SYMBOL(blake2s_update);

void blake2s_final(struct blake2s_state *state, u8 *out)
{
	WARN_ON(IS_ENABLED(DEBUG) && !out);
	blake2s_set_lastblock(state);
	memset(state->buf + state->buflen, 0,
	       BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
	blake2s_compress(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));
}
EXPORT_SYMBOL(blake2s_final);

static int __init blake2s_mod_init(void)
{
	if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) &&
	    WARN_ON(!blake2s_selftest()))
		return -ENODEV;
	return 0;
}

module_init(blake2s_mod_init);
MODULE_DESCRIPTION("BLAKE2s hash function");
MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");
Commit	Line	Data
66d7fb94 JD	1	// SPDX-License-Identifier: GPL-2.0 OR MIT
	2	/*
	3	* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
	4	*
	5	* This is an implementation of the BLAKE2s hash and PRF functions.
	6	*
	7	* Information: https://blake2.net/
	8	*
	9	*/
	10
	11	#include <crypto/internal/blake2s.h>
	12	#include <linux/types.h>
	13	#include <linux/string.h>
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/init.h>
	17	#include <linux/bug.h>
057edc9c	18
2d16803c JD	19	static inline void blake2s_set_lastblock(struct blake2s_state *state)
	20	{
	21	state->f[0] = -1;
	22	}
	23
66d7fb94 JD	24	void blake2s_update(struct blake2s_state state, const u8 in, size_t inlen)
66d7fb94 JD	25	{
2d16803c JD	26	const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
	27
	28	if (unlikely(!inlen))
	29	return;
	30	if (inlen > fill) {
	31	memcpy(state->buf + state->buflen, in, fill);
	32	blake2s_compress(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
	33	state->buflen = 0;
	34	in += fill;
	35	inlen -= fill;
	36	}
	37	if (inlen > BLAKE2S_BLOCK_SIZE) {
	38	const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
	39	blake2s_compress(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
	40	in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
	41	inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
	42	}
	43	memcpy(state->buf + state->buflen, in, inlen);
	44	state->buflen += inlen;
66d7fb94 JD	45	}
	46	EXPORT_SYMBOL(blake2s_update);
	47
	48	void blake2s_final(struct blake2s_state state, u8 out)
	49	{
	50	WARN_ON(IS_ENABLED(DEBUG) && !out);
2d16803c JD	51	blake2s_set_lastblock(state);
	52	memset(state->buf + state->buflen, 0,
	53	BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
	54	blake2s_compress(state, state->buf, 1, state->buflen);
	55	cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
	56	memcpy(out, state->h, state->outlen);
66d7fb94 JD	57	memzero_explicit(state, sizeof(*state));
	58	}
	59	EXPORT_SYMBOL(blake2s_final);
	60
f03a3cab	61	static int __init blake2s_mod_init(void)
66d7fb94 JD	62	{
	63	if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) &&
	64	WARN_ON(!blake2s_selftest()))
	65	return -ENODEV;
	66	return 0;
	67	}
	68
f03a3cab	69	module_init(blake2s_mod_init);
66d7fb94 JD	70	MODULE_DESCRIPTION("BLAKE2s hash function");
66d7fb94 JD	71	MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");