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/* 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_KYBER_INTERNAL_H
#define OPENSSL_HEADER_CRYPTO_KYBER_INTERNAL_H
#include <openssl/base.h>
#include <openssl/kyber.h>
#if defined(__cplusplus)
extern "C" {
#endif
// KYBER_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 KYBER_ENCAP_ENTROPY 32
// KYBER_GENERATE_KEY_ENTROPY is the number of bytes of uniformly random entropy
// necessary to generate a key.
#define KYBER_GENERATE_KEY_ENTROPY 64
// KYBER_generate_key_external_entropy is a deterministic function to create a
// pair of Kyber768 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 |KYBER_generate_key|
// directly.
OPENSSL_EXPORT void KYBER_generate_key_external_entropy(
uint8_t out_encoded_public_key[KYBER_PUBLIC_KEY_BYTES],
struct KYBER_private_key *out_private_key,
const uint8_t entropy[KYBER_GENERATE_KEY_ENTROPY]);
// KYBER_encap_external_entropy behaves like |KYBER_encap|, but uses
// |KYBER_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
// |KYBER_encap| directly.
OPENSSL_EXPORT void KYBER_encap_external_entropy(
uint8_t out_ciphertext[KYBER_CIPHERTEXT_BYTES],
uint8_t out_shared_secret[KYBER_SHARED_SECRET_BYTES],
const struct KYBER_public_key *public_key,
const uint8_t entropy[KYBER_ENCAP_ENTROPY]);
#if defined(__cplusplus)
}
#endif
#endif // OPENSSL_HEADER_CRYPTO_KYBER_INTERNAL_H
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