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66680715fd
commit d8d83d8ab0 upstream.
Basically nobody should use blake2s in an HMAC construction; it already
has a keyed variant. But unfortunately for historical reasons, Noise,
used by WireGuard, uses HKDF quite strictly, which means we have to use
this. Because this really shouldn't be used by others, this commit moves
it into wireguard's noise.c locally, so that kernels that aren't using
WireGuard don't get this superfluous code baked in. On m68k systems,
this shaves off ~314 bytes.
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
[Jason: for stable, skip the wireguard changes, since this kernel
doesn't have wireguard.]
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
78 lines
2.1 KiB
C
78 lines
2.1 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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#include <asm/unaligned.h>
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bool blake2s_selftest(void);
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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_generic(state, state->buf, 1,
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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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/* Hash one less (full) block than strictly possible */
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blake2s_compress_generic(state, in, nblocks - 1,
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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_generic(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 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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static void __exit mod_exit(void)
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{
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}
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module_init(mod_init);
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module_exit(mod_exit);
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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 <Jason@zx2c4.com>");
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