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/*
* NEWHOPE Ring-LWE scheme
* Based on the public domain reference implementation by the
* designers (https://github.com/tpoeppelmann/newhope)
*
* Further changes
* (C) 2016 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_NEWHOPE_H__
#define BOTAN_NEWHOPE_H__
#include <botan/rng.h>
namespace Botan {
/*
* WARNING: This API is preliminary and will change
* Currently pubkey.h does not support a 2-phase KEM scheme of
* the sort NEWHOPE exports.
*/
#define NEWHOPE_SENDABYTES 1824
#define NEWHOPE_SENDBBYTES 2048
typedef struct {
uint16_t coeffs[1024];
} newhope_poly;
/**
* This chooses the XOF + hash for NewHope
* The official NewHope specification and reference implementation use
* SHA-3 and SHAKE-128. BoringSSL instead uses SHA-256 and AES-128 in
* CTR mode.
*/
enum class Newhope_Mode {
SHA3,
BoringSSL
};
void BOTAN_DLL newhope_keygen(uint8_t *send,
newhope_poly *sk,
RandomNumberGenerator& rng,
Newhope_Mode = Newhope_Mode::SHA3);
void BOTAN_DLL newhope_sharedb(uint8_t *sharedkey,
uint8_t *send,
const uint8_t *received,
RandomNumberGenerator& rng,
Newhope_Mode mode = Newhope_Mode::SHA3);
void BOTAN_DLL newhope_shareda(uint8_t *sharedkey,
const newhope_poly *ska,
const uint8_t *received,
Newhope_Mode mode = Newhope_Mode::SHA3);
}
#endif
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