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72 lines
2.0 KiB
72 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0 OR MIT |
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/* |
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* Copyright (C) 2015-2019 Jason A. Donenfeld <[email protected]>. 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_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("BLAKE2s hash function"); |
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MODULE_AUTHOR("Jason A. Donenfeld <[email protected]>");
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