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/*
* CECPQ1 (x25519 + NewHope)
* (C) 2016 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/cecpq1.h>
#include <botan/newhope.h>
#include <botan/curve25519.h>
#include <botan/rng.h>
namespace Botan {
void CECPQ1_offer(uint8_t send[CECPQ1_OFFER_BYTES],
CECPQ1_key* offer_key_output,
RandomNumberGenerator& rng)
{
offer_key_output->m_x25519 = rng.random_vec(32);
curve25519_basepoint(send, offer_key_output->m_x25519.data());
newhope_keygen(send + 32, &offer_key_output->m_newhope,
rng, Newhope_Mode::BoringSSL);
}
void CECPQ1_accept(uint8_t shared_key[CECPQ1_SHARED_KEY_BYTES],
uint8_t send[CECPQ1_ACCEPT_BYTES],
const uint8_t received[CECPQ1_OFFER_BYTES],
RandomNumberGenerator& rng)
{
secure_vector<uint8_t> x25519_key = rng.random_vec(32);
curve25519_basepoint(send, x25519_key.data());
curve25519_donna(shared_key, x25519_key.data(), received);
newhope_sharedb(shared_key + 32, send + 32, received + 32,
rng, Newhope_Mode::BoringSSL);
}
void CECPQ1_finish(uint8_t shared_key[CECPQ1_SHARED_KEY_BYTES],
const CECPQ1_key& offer_key,
const uint8_t received[CECPQ1_ACCEPT_BYTES])
{
curve25519_donna(shared_key, offer_key.m_x25519.data(), received);
newhope_shareda(shared_key + 32, &offer_key.m_newhope, received + 32,
Newhope_Mode::BoringSSL);
}
}