cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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blake2s-generic.c (3089B)


      1// SPDX-License-Identifier: GPL-2.0 OR MIT
      2/*
      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#include <asm/unaligned.h>
     19
     20static const u8 blake2s_sigma[10][16] = {
     21	{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
     22	{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 },
     23	{ 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 },
     24	{ 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 },
     25	{ 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 },
     26	{ 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 },
     27	{ 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 },
     28	{ 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 },
     29	{ 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 },
     30	{ 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 },
     31};
     32
     33static inline void blake2s_increment_counter(struct blake2s_state *state,
     34					     const u32 inc)
     35{
     36	state->t[0] += inc;
     37	state->t[1] += (state->t[0] < inc);
     38}
     39
     40void blake2s_compress(struct blake2s_state *state, const u8 *block,
     41		      size_t nblocks, const u32 inc)
     42		      __weak __alias(blake2s_compress_generic);
     43
     44void blake2s_compress_generic(struct blake2s_state *state, const u8 *block,
     45			      size_t nblocks, const u32 inc)
     46{
     47	u32 m[16];
     48	u32 v[16];
     49	int i;
     50
     51	WARN_ON(IS_ENABLED(DEBUG) &&
     52		(nblocks > 1 && inc != BLAKE2S_BLOCK_SIZE));
     53
     54	while (nblocks > 0) {
     55		blake2s_increment_counter(state, inc);
     56		memcpy(m, block, BLAKE2S_BLOCK_SIZE);
     57		le32_to_cpu_array(m, ARRAY_SIZE(m));
     58		memcpy(v, state->h, 32);
     59		v[ 8] = BLAKE2S_IV0;
     60		v[ 9] = BLAKE2S_IV1;
     61		v[10] = BLAKE2S_IV2;
     62		v[11] = BLAKE2S_IV3;
     63		v[12] = BLAKE2S_IV4 ^ state->t[0];
     64		v[13] = BLAKE2S_IV5 ^ state->t[1];
     65		v[14] = BLAKE2S_IV6 ^ state->f[0];
     66		v[15] = BLAKE2S_IV7 ^ state->f[1];
     67
     68#define G(r, i, a, b, c, d) do { \
     69	a += b + m[blake2s_sigma[r][2 * i + 0]]; \
     70	d = ror32(d ^ a, 16); \
     71	c += d; \
     72	b = ror32(b ^ c, 12); \
     73	a += b + m[blake2s_sigma[r][2 * i + 1]]; \
     74	d = ror32(d ^ a, 8); \
     75	c += d; \
     76	b = ror32(b ^ c, 7); \
     77} while (0)
     78
     79#define ROUND(r) do { \
     80	G(r, 0, v[0], v[ 4], v[ 8], v[12]); \
     81	G(r, 1, v[1], v[ 5], v[ 9], v[13]); \
     82	G(r, 2, v[2], v[ 6], v[10], v[14]); \
     83	G(r, 3, v[3], v[ 7], v[11], v[15]); \
     84	G(r, 4, v[0], v[ 5], v[10], v[15]); \
     85	G(r, 5, v[1], v[ 6], v[11], v[12]); \
     86	G(r, 6, v[2], v[ 7], v[ 8], v[13]); \
     87	G(r, 7, v[3], v[ 4], v[ 9], v[14]); \
     88} while (0)
     89		ROUND(0);
     90		ROUND(1);
     91		ROUND(2);
     92		ROUND(3);
     93		ROUND(4);
     94		ROUND(5);
     95		ROUND(6);
     96		ROUND(7);
     97		ROUND(8);
     98		ROUND(9);
     99
    100#undef G
    101#undef ROUND
    102
    103		for (i = 0; i < 8; ++i)
    104			state->h[i] ^= v[i] ^ v[i + 8];
    105
    106		block += BLAKE2S_BLOCK_SIZE;
    107		--nblocks;
    108	}
    109}
    110
    111EXPORT_SYMBOL(blake2s_compress_generic);
    112
    113MODULE_LICENSE("GPL v2");
    114MODULE_DESCRIPTION("BLAKE2s hash function");
    115MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");