72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR MIT
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/*
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* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*
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* This is an implementation of the BLAKE2s hash and PRF functions.
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*
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* Information: https://blake2.net/
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*
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*/
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#include <crypto/internal/blake2s.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/bug.h>
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static inline void blake2s_set_lastblock(struct blake2s_state *state)
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{
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state->f[0] = -1;
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}
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void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen)
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{
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const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
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if (unlikely(!inlen))
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return;
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if (inlen > fill) {
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memcpy(state->buf + state->buflen, in, fill);
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blake2s_compress(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
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state->buflen = 0;
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in += fill;
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inlen -= fill;
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}
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if (inlen > BLAKE2S_BLOCK_SIZE) {
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const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
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blake2s_compress(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
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in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
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inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
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}
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memcpy(state->buf + state->buflen, in, inlen);
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state->buflen += inlen;
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}
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EXPORT_SYMBOL(blake2s_update);
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void blake2s_final(struct blake2s_state *state, u8 *out)
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{
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WARN_ON(IS_ENABLED(DEBUG) && !out);
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blake2s_set_lastblock(state);
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memset(state->buf + state->buflen, 0,
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BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
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blake2s_compress(state, state->buf, 1, state->buflen);
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cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
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memcpy(out, state->h, state->outlen);
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memzero_explicit(state, sizeof(*state));
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}
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EXPORT_SYMBOL(blake2s_final);
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static int __init blake2s_mod_init(void)
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{
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if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) &&
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WARN_ON(!blake2s_selftest()))
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return -ENODEV;
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return 0;
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}
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module_init(blake2s_mod_init);
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MODULE_DESCRIPTION("BLAKE2s hash function");
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MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");
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