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/* SPDX-License-Identifier: GPL-2.0 OR MIT */
/*
* Helper functions for BLAKE2b implementations.
* Keep this in sync with the corresponding BLAKE2s header.
*/
#ifndef _CRYPTO_INTERNAL_BLAKE2B_H
#define _CRYPTO_INTERNAL_BLAKE2B_H
#include <crypto/blake2b.h>
#include <crypto/internal/hash.h>
#include <linux/string.h>
void blake2b_compress_generic(struct blake2b_state *state,
const u8 *block, size_t nblocks, u32 inc);
static inline void blake2b_set_lastblock(struct blake2b_state *state)
{
state->f[0] = -1;
}
typedef void (*blake2b_compress_t)(struct blake2b_state *state,
const u8 *block, size_t nblocks, u32 inc);
static inline void __blake2b_update(struct blake2b_state *state,
const u8 *in, size_t inlen,
blake2b_compress_t compress)
{
const size_t fill = BLAKE2B_BLOCK_SIZE - state->buflen;
if (unlikely(!inlen))
return;
if (inlen > fill) {
memcpy(state->buf + state->buflen, in, fill);
(*compress)(state, state->buf, 1, BLAKE2B_BLOCK_SIZE);
state->buflen = 0;
in += fill;
inlen -= fill;
}
if (inlen > BLAKE2B_BLOCK_SIZE) {
const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2B_BLOCK_SIZE);
/* Hash one less (full) block than strictly possible */
(*compress)(state, in, nblocks - 1, BLAKE2B_BLOCK_SIZE);
in += BLAKE2B_BLOCK_SIZE * (nblocks - 1);
inlen -= BLAKE2B_BLOCK_SIZE * (nblocks - 1);
}
memcpy(state->buf + state->buflen, in, inlen);
state->buflen += inlen;
}
static inline void __blake2b_final(struct blake2b_state *state, u8 *out,
blake2b_compress_t compress)
{
int i;
blake2b_set_lastblock(state);
memset(state->buf + state->buflen, 0,
BLAKE2B_BLOCK_SIZE - state->buflen); /* Padding */
(*compress)(state, state->buf, 1, state->buflen);
for (i = 0; i < ARRAY_SIZE(state->h); i++)
__cpu_to_le64s(&state->h[i]);
memcpy(out, state->h, state->outlen);
}
/* Helper functions for shash implementations of BLAKE2b */
struct blake2b_tfm_ctx {
u8 key[BLAKE2B_KEY_SIZE];
unsigned int keylen;
};
static inline int crypto_blake2b_setkey(struct crypto_shash *tfm,
const u8 *key, unsigned int keylen)
{
struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(tfm);
if (keylen == 0 || keylen > BLAKE2B_KEY_SIZE)
return -EINVAL;
memcpy(tctx->key, key, keylen);
tctx->keylen = keylen;
return 0;
}
static inline int crypto_blake2b_init(struct shash_desc *desc)
{
const struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
struct blake2b_state *state = shash_desc_ctx(desc);
unsigned int outlen = crypto_shash_digestsize(desc->tfm);
__blake2b_init(state, outlen, tctx->key, tctx->keylen);
return 0;
}
static inline int crypto_blake2b_update(struct shash_desc *desc,
const u8 *in, unsigned int inlen,
blake2b_compress_t compress)
{
struct blake2b_state *state = shash_desc_ctx(desc);
__blake2b_update(state, in, inlen, compress);
return 0;
}
static inline int crypto_blake2b_final(struct shash_desc *desc, u8 *out,
blake2b_compress_t compress)
{
struct blake2b_state *state = shash_desc_ctx(desc);
__blake2b_final(state, out, compress);
return 0;
}
#endif /* _CRYPTO_INTERNAL_BLAKE2B_H */