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1// SPDX-License-Identifier: GPL-2.0 OR MIT2/*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>18 19static inline void blake2s_set_lastblock(struct blake2s_state *state)20{21	state->f[0] = -1;22}23 24void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen)25{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;45}46EXPORT_SYMBOL(blake2s_update);47 48void blake2s_final(struct blake2s_state *state, u8 *out)49{50	WARN_ON(IS_ENABLED(DEBUG) && !out);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);57	memzero_explicit(state, sizeof(*state));58}59EXPORT_SYMBOL(blake2s_final);60 61static int __init blake2s_mod_init(void)62{63	if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) &&64	    WARN_ON(!blake2s_selftest()))65		return -ENODEV;66	return 0;67}68 69module_init(blake2s_mod_init);70MODULE_DESCRIPTION("BLAKE2s hash function");71MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");72