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6048fdcc5f
In preparation for using blake2s in the RNG, we change the way that it is wired-in to the build system. Instead of using ifdefs to select the right symbol, we use weak symbols. And because ARM doesn't need the generic implementation, we make the generic one default only if an arch library doesn't need it already, and then have arch libraries that do need it opt-in. So that the arch libraries can remain tristate rather than bool, we then split the shash part from the glue code. Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Acked-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Masahiro Yamada <masahiroy@kernel.org> Cc: linux-kbuild@vger.kernel.org Cc: linux-crypto@vger.kernel.org Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
115 lines
3 KiB
C
115 lines
3 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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static const u8 blake2s_sigma[10][16] = {
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
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{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 },
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{ 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 },
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{ 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 },
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{ 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 },
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{ 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 },
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{ 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 },
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{ 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 },
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{ 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 },
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{ 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 },
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};
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static inline void blake2s_increment_counter(struct blake2s_state *state,
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const u32 inc)
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{
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state->t[0] += inc;
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state->t[1] += (state->t[0] < inc);
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}
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void blake2s_compress(struct blake2s_state *state, const u8 *block,
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size_t nblocks, const u32 inc)
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__weak __alias(blake2s_compress_generic);
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void blake2s_compress_generic(struct blake2s_state *state, const u8 *block,
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size_t nblocks, const u32 inc)
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{
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u32 m[16];
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u32 v[16];
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int i;
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WARN_ON(IS_ENABLED(DEBUG) &&
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(nblocks > 1 && inc != BLAKE2S_BLOCK_SIZE));
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while (nblocks > 0) {
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blake2s_increment_counter(state, inc);
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memcpy(m, block, BLAKE2S_BLOCK_SIZE);
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le32_to_cpu_array(m, ARRAY_SIZE(m));
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memcpy(v, state->h, 32);
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v[ 8] = BLAKE2S_IV0;
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v[ 9] = BLAKE2S_IV1;
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v[10] = BLAKE2S_IV2;
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v[11] = BLAKE2S_IV3;
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v[12] = BLAKE2S_IV4 ^ state->t[0];
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v[13] = BLAKE2S_IV5 ^ state->t[1];
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v[14] = BLAKE2S_IV6 ^ state->f[0];
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v[15] = BLAKE2S_IV7 ^ state->f[1];
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#define G(r, i, a, b, c, d) do { \
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a += b + m[blake2s_sigma[r][2 * i + 0]]; \
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d = ror32(d ^ a, 16); \
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c += d; \
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b = ror32(b ^ c, 12); \
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a += b + m[blake2s_sigma[r][2 * i + 1]]; \
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d = ror32(d ^ a, 8); \
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c += d; \
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b = ror32(b ^ c, 7); \
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} while (0)
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#define ROUND(r) do { \
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G(r, 0, v[0], v[ 4], v[ 8], v[12]); \
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G(r, 1, v[1], v[ 5], v[ 9], v[13]); \
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G(r, 2, v[2], v[ 6], v[10], v[14]); \
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G(r, 3, v[3], v[ 7], v[11], v[15]); \
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G(r, 4, v[0], v[ 5], v[10], v[15]); \
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G(r, 5, v[1], v[ 6], v[11], v[12]); \
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G(r, 6, v[2], v[ 7], v[ 8], v[13]); \
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G(r, 7, v[3], v[ 4], v[ 9], v[14]); \
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} while (0)
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ROUND(0);
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ROUND(1);
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ROUND(2);
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ROUND(3);
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ROUND(4);
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ROUND(5);
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ROUND(6);
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ROUND(7);
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ROUND(8);
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ROUND(9);
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#undef G
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#undef ROUND
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for (i = 0; i < 8; ++i)
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state->h[i] ^= v[i] ^ v[i + 8];
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block += BLAKE2S_BLOCK_SIZE;
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--nblocks;
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}
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}
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EXPORT_SYMBOL(blake2s_compress_generic);
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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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