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/* $OpenBSD: mlkem_internal.h,v 1.4 2024/12/19 23:52:26 tb Exp $ */
/*
* Copyright (c) 2023, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef OPENSSL_HEADER_CRYPTO_MLKEM_INTERNAL_H
#define OPENSSL_HEADER_CRYPTO_MLKEM_INTERNAL_H
#include "bytestring.h"
#include "mlkem.h"
#if defined(__cplusplus)
extern "C" {
#endif
__BEGIN_HIDDEN_DECLS
/*
* MLKEM_ENCAP_ENTROPY is the number of bytes of uniformly random entropy
* necessary to encapsulate a secret. The entropy will be leaked to the
* decapsulating party.
*/
#define MLKEM_ENCAP_ENTROPY 32
/*
* MLKEM768_generate_key_external_entropy is a deterministic function to create a
* pair of ML-KEM 768 keys, using the supplied entropy. The entropy needs to be
* uniformly random generated. This function is should only be used for tests,
* regular callers should use the non-deterministic |MLKEM_generate_key|
* directly.
*/
void MLKEM768_generate_key_external_entropy(
uint8_t out_encoded_public_key[MLKEM768_PUBLIC_KEY_BYTES],
struct MLKEM768_private_key *out_private_key,
const uint8_t entropy[MLKEM_SEED_BYTES]);
/*
* MLKEM768_PRIVATE_KEY_BYTES is the length of the data produced by
* |MLKEM768_marshal_private_key|.
*/
#define MLKEM768_PRIVATE_KEY_BYTES 2400
/*
* MLKEM768_marshal_private_key serializes |private_key| to |out| in the standard
* format for ML-KEM private keys. It returns one on success or zero on
* allocation error.
*/
int MLKEM768_marshal_private_key(CBB *out,
const struct MLKEM768_private_key *private_key);
/*
* MLKEM_encap_external_entropy behaves like |MLKEM_encap|, but uses
* |MLKEM_ENCAP_ENTROPY| bytes of |entropy| for randomization. The decapsulating
* side will be able to recover |entropy| in full. This function should only be
* used for tests, regular callers should use the non-deterministic
* |MLKEM_encap| directly.
*/
void MLKEM768_encap_external_entropy(
uint8_t out_ciphertext[MLKEM768_CIPHERTEXT_BYTES],
uint8_t out_shared_secret[MLKEM_SHARED_SECRET_BYTES],
const struct MLKEM768_public_key *public_key,
const uint8_t entropy[MLKEM_ENCAP_ENTROPY]);
/*
* MLKEM1024_generate_key_external_entropy is a deterministic function to create a
* pair of ML-KEM 1024 keys, using the supplied entropy. The entropy needs to be
* uniformly random generated. This function is should only be used for tests,
* regular callers should use the non-deterministic |MLKEM_generate_key|
* directly.
*/
void MLKEM1024_generate_key_external_entropy(
uint8_t out_encoded_public_key[MLKEM1024_PUBLIC_KEY_BYTES],
struct MLKEM1024_private_key *out_private_key,
const uint8_t entropy[MLKEM_SEED_BYTES]);
/*
* MLKEM1024_PRIVATE_KEY_BYTES is the length of the data produced by
* |MLKEM1024_marshal_private_key|.
*/
#define MLKEM1024_PRIVATE_KEY_BYTES 3168
/*
* MLKEM1024_marshal_private_key serializes |private_key| to |out| in the
* standard format for ML-KEM private keys. It returns one on success or zero on
* allocation error.
*/
int MLKEM1024_marshal_private_key(CBB *out,
const struct MLKEM1024_private_key *private_key);
/*
* MLKEM_encap_external_entropy behaves like |MLKEM_encap|, but uses
* |MLKEM_ENCAP_ENTROPY| bytes of |entropy| for randomization. The decapsulating
* side will be able to recover |entropy| in full. This function should only be
* used for tests, regular callers should use the non-deterministic
* |MLKEM_encap| directly.
*/
void MLKEM1024_encap_external_entropy(
uint8_t out_ciphertext[MLKEM1024_CIPHERTEXT_BYTES],
uint8_t out_shared_secret[MLKEM_SHARED_SECRET_BYTES],
const struct MLKEM1024_public_key *public_key,
const uint8_t entropy[MLKEM_ENCAP_ENTROPY]);
__END_HIDDEN_DECLS
#if defined(__cplusplus)
}
#endif
#endif /* OPENSSL_HEADER_CRYPTO_MLKEM_INTERNAL_H */
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