/* SPDX-License-Identifier: GPL-2.0 OR MIT */
/*
* Helper functions for BLAKE2s implementations.
* Keep this in sync with the corresponding BLAKE2b header.
*/
#ifndef _CRYPTO_INTERNAL_BLAKE2S_H
#define _CRYPTO_INTERNAL_BLAKE2S_H
#include <crypto/blake2s.h>
#include <crypto/internal/hash.h>
#include <linux/string.h>
void blake2s_compress_generic(struct blake2s_state *state, const u8 *block,
size_t nblocks, const u32 inc);
void blake2s_compress(struct blake2s_state *state, const u8 *block,
size_t nblocks, const u32 inc);
bool blake2s_selftest(void);
static inline void blake2s_set_lastblock(struct blake2s_state *state)
{
state->f[0] = -1;
}
/* Helper functions for BLAKE2s shared by the library and shash APIs */
static __always_inline void
__blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen,
bool force_generic)
{
const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
if (unlikely(!inlen))
return;
if (inlen > fill) {
memcpy(state->buf + state->buflen, in, fill);
if (force_generic)
blake2s_compress_generic(state, state->buf, 1,
BLAKE2S_BLOCK_SIZE);
else
blake2s_compress(state, state->buf, 1,
BLAKE2S_BLOCK_SIZE);
state->buflen = 0;
in += fill;
inlen -= fill;
}
if (inlen > BLAKE2S_BLOCK_SIZE) {
const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
/* Hash one less (full) block than strictly possible */
if (force_generic)
blake2s_compress_generic(state, in, nblocks - 1,
BLAKE2S_BLOCK_SIZE);
else
blake2s_compress(state, in, nblocks - 1,
BLAKE2S_BLOCK_SIZE);
in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
}
memcpy(state->buf + state->buflen, in, inlen);
state->buflen += inlen;
}
static __always_inline void
__blake2s_final(struct blake2s_state *state, u8 *out, bool force_generic)
{
blake2s_set_lastblock(state);
memset(state->buf + state->buflen, 0,
BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
if (force_generic)
blake2s_compress_generic(state, state->buf, 1, state->buflen);
else
blake2s_compress(state, state->buf, 1, state->buflen);
cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
memcpy(out, state->h, state->outlen);
}
/* Helper functions for shash implementations of BLAKE2s */
struct blake2s_tfm_ctx {
u8 key[BLAKE2S_KEY_SIZE];
unsigned int keylen;
};
static inline int crypto_blake2s_setkey(struct crypto_shash *tfm,
const u8 *key, unsigned int keylen)
{
struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(tfm);
if (keylen == 0 || keylen > BLAKE2S_KEY_SIZE)
return -EINVAL;
memcpy(tctx->key, key, keylen);
tctx->keylen = keylen;
return 0;
}
static inline int crypto_blake2s_init(struct shash_desc *desc)
{
const struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
struct blake2s_state *state = shash_desc_ctx(desc);
unsigned int outlen = crypto_shash_digestsize(desc->tfm);
__blake2s_init(state, outlen, tctx->key, tctx->keylen);
return 0;
}
static inline int crypto_blake2s_update(struct shash_desc *desc,
const u8 *in, unsigned int inlen,
bool force_generic)
{
struct blake2s_state *state = shash_desc_ctx(desc);
__blake2s_update(state, in, inlen, force_generic);
return 0;
}
static inline int crypto_blake2s_final(struct shash_desc *desc, u8 *out,
bool force_generic)
{
struct blake2s_state *state = shash_desc_ctx(desc);
__blake2s_final(state, out, force_generic);
return 0;
}
#endif /* _CRYPTO_INTERNAL_BLAKE2S_H */