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/* SPDX-License-Identifier: GPL-2.0
*
* Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#ifndef _ZINC_BLAKE2S_H
#define _ZINC_BLAKE2S_H
#include <linux/types.h>
#include <linux/kernel.h>
#include <crypto/algapi.h>
enum blake2s_lengths {
BLAKE2S_BLOCKBYTES = 64,
BLAKE2S_OUTBYTES = 32,
BLAKE2S_KEYBYTES = 32
};
struct blake2s_state {
u32 h[8];
u32 t[2];
u32 f[2];
u8 buf[BLAKE2S_BLOCKBYTES];
size_t buflen;
u8 last_node;
};
void blake2s_init(struct blake2s_state *state, const size_t outlen);
void blake2s_init_key(struct blake2s_state *state, const size_t outlen,
const void *key, const size_t keylen);
void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen);
void __blake2s_final(struct blake2s_state *state);
static inline void blake2s_final(struct blake2s_state *state, u8 *out,
const size_t outlen)
{
int i;
#ifdef DEBUG
BUG_ON(!out || !outlen || outlen > BLAKE2S_OUTBYTES);
#endif
__blake2s_final(state);
if (__builtin_constant_p(outlen) && !(outlen % sizeof(u32))) {
if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
IS_ALIGNED((unsigned long)out, __alignof__(u32))) {
__le32 *outwords = (__le32 *)out;
for (i = 0; i < outlen / sizeof(u32); ++i)
outwords[i] = cpu_to_le32(state->h[i]);
} else {
__le32 buffer[BLAKE2S_OUTBYTES];
for (i = 0; i < outlen / sizeof(u32); ++i)
buffer[i] = cpu_to_le32(state->h[i]);
memcpy(out, buffer, outlen);
memzero_explicit(buffer, sizeof(buffer));
}
} else {
u8 buffer[BLAKE2S_OUTBYTES] __aligned(__alignof__(u32));
__le32 *outwords = (__le32 *)buffer;
for (i = 0; i < 8; ++i)
outwords[i] = cpu_to_le32(state->h[i]);
memcpy(out, buffer, outlen);
memzero_explicit(buffer, sizeof(buffer));
}
memzero_explicit(state, sizeof(*state));
}
static inline void blake2s(u8 *out, const u8 *in, const u8 *key,
const size_t outlen, const size_t inlen,
const size_t keylen)
{
struct blake2s_state state;
#ifdef DEBUG
BUG_ON((!in && inlen > 0) || !out || !outlen ||
outlen > BLAKE2S_OUTBYTES || keylen > BLAKE2S_KEYBYTES ||
(!key && keylen));
#endif
if (keylen)
blake2s_init_key(&state, outlen, key, keylen);
else
blake2s_init(&state, outlen);
blake2s_update(&state, in, inlen);
blake2s_final(&state, out, outlen);
}
void blake2s_hmac(u8 *out, const u8 *in, const u8 *key, const size_t outlen,
const size_t inlen, const size_t keylen);
void blake2s_fpu_init(void);
#ifdef DEBUG
bool blake2s_selftest(void);
#endif
#endif /* _ZINC_BLAKE2S_H */
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