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// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*
* This is an implementation of the BLAKE2s hash and PRF functions.
*
* Information: https://blake2.net/
*/
#include "blake2s.h"
#include <linux/kernel.h>
static inline u32 ror32(u32 v, int n)
{
return (v >> n) | (v << (32 - n));
}
static inline void le32_to_cpu_array(u32 a[], size_t n)
{
for (size_t i = 0; i < n; i++)
a[i] = le32_to_cpu((__force __le32)a[i]);
}
static inline void cpu_to_le32_array(u32 a[], size_t n)
{
for (size_t i = 0; i < n; i++)
a[i] = (__force u32)cpu_to_le32(a[i]);
}
static const u8 blake2s_sigma[10][16] = {
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 },
{ 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 },
{ 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 },
{ 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 },
{ 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 },
{ 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 },
{ 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 },
{ 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 },
{ 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 },
};
static inline void blake2s_increment_counter(struct blake2s_ctx *ctx, u32 inc)
{
ctx->t[0] += inc;
ctx->t[1] += (ctx->t[0] < inc);
}
static void blake2s_compress(struct blake2s_ctx *ctx,
const u8 *data, size_t nblocks, u32 inc)
{
u32 m[16];
u32 v[16];
int i;
while (nblocks > 0) {
blake2s_increment_counter(ctx, inc);
memcpy(m, data, BLAKE2S_BLOCK_SIZE);
le32_to_cpu_array(m, ARRAY_SIZE(m));
memcpy(v, ctx->h, 32);
v[ 8] = BLAKE2S_IV0;
v[ 9] = BLAKE2S_IV1;
v[10] = BLAKE2S_IV2;
v[11] = BLAKE2S_IV3;
v[12] = BLAKE2S_IV4 ^ ctx->t[0];
v[13] = BLAKE2S_IV5 ^ ctx->t[1];
v[14] = BLAKE2S_IV6 ^ ctx->f[0];
v[15] = BLAKE2S_IV7 ^ ctx->f[1];
#define G(r, i, a, b, c, d) do { \
a += b + m[blake2s_sigma[r][2 * i + 0]]; \
d = ror32(d ^ a, 16); \
c += d; \
b = ror32(b ^ c, 12); \
a += b + m[blake2s_sigma[r][2 * i + 1]]; \
d = ror32(d ^ a, 8); \
c += d; \
b = ror32(b ^ c, 7); \
} while (0)
#define ROUND(r) do { \
G(r, 0, v[0], v[ 4], v[ 8], v[12]); \
G(r, 1, v[1], v[ 5], v[ 9], v[13]); \
G(r, 2, v[2], v[ 6], v[10], v[14]); \
G(r, 3, v[3], v[ 7], v[11], v[15]); \
G(r, 4, v[0], v[ 5], v[10], v[15]); \
G(r, 5, v[1], v[ 6], v[11], v[12]); \
G(r, 6, v[2], v[ 7], v[ 8], v[13]); \
G(r, 7, v[3], v[ 4], v[ 9], v[14]); \
} while (0)
ROUND(0);
ROUND(1);
ROUND(2);
ROUND(3);
ROUND(4);
ROUND(5);
ROUND(6);
ROUND(7);
ROUND(8);
ROUND(9);
#undef G
#undef ROUND
for (i = 0; i < 8; ++i)
ctx->h[i] ^= v[i] ^ v[i + 8];
data += BLAKE2S_BLOCK_SIZE;
--nblocks;
}
}
static inline void blake2s_set_lastblock(struct blake2s_ctx *ctx)
{
ctx->f[0] = -1;
}
void blake2s_update(struct blake2s_ctx *ctx, const u8 *in, size_t inlen)
{
const size_t fill = BLAKE2S_BLOCK_SIZE - ctx->buflen;
if (unlikely(!inlen))
return;
if (inlen > fill) {
memcpy(ctx->buf + ctx->buflen, in, fill);
blake2s_compress(ctx, ctx->buf, 1, BLAKE2S_BLOCK_SIZE);
ctx->buflen = 0;
in += fill;
inlen -= fill;
}
if (inlen > BLAKE2S_BLOCK_SIZE) {
const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
blake2s_compress(ctx, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
}
memcpy(ctx->buf + ctx->buflen, in, inlen);
ctx->buflen += inlen;
}
void blake2s_final(struct blake2s_ctx *ctx, u8 *out)
{
blake2s_set_lastblock(ctx);
memset(ctx->buf + ctx->buflen, 0,
BLAKE2S_BLOCK_SIZE - ctx->buflen); /* Padding */
blake2s_compress(ctx, ctx->buf, 1, ctx->buflen);
cpu_to_le32_array(ctx->h, ARRAY_SIZE(ctx->h));
memcpy(out, ctx->h, ctx->outlen);
memset(ctx, 0, sizeof(*ctx));
}
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