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/**
* (C) 2014 cryptosource GmbH
* (C) 2014 Falko Strenzke fstrenzke@cryptosource.de
*
* Botan is released under the Simplified BSD License (see license.txt)
*
*/
#include <botan/mce_kem.h>
#include <botan/internal/mce_internal.h>
#include <botan/sha2_64.h>
namespace Botan {
McEliece_KEM_Encryptor::McEliece_KEM_Encryptor(const McEliece_PublicKey& public_key) :
m_key(public_key)
{
}
std::pair<secure_vector<byte>, secure_vector<byte>>
McEliece_KEM_Encryptor::encrypt(RandomNumberGenerator& rng)
{
const secure_vector<byte> plaintext = m_key.random_plaintext_element(rng);
secure_vector<byte> ciphertext, error_mask;
mceliece_encrypt(ciphertext, error_mask, plaintext, m_key, rng);
SHA_512 hash;
hash.update(plaintext);
hash.update(error_mask);
secure_vector<byte> sym_key = hash.final();
return std::make_pair(ciphertext, sym_key);
}
McEliece_KEM_Decryptor::McEliece_KEM_Decryptor(const McEliece_PrivateKey& key) : m_key(key) { }
secure_vector<Botan::byte> McEliece_KEM_Decryptor::decrypt(const byte msg[], size_t msg_len)
{
secure_vector<byte> plaintext, error_mask;
mceliece_decrypt(plaintext, error_mask, msg, msg_len, m_key);
SHA_512 hash;
hash.update(plaintext);
hash.update(error_mask);
secure_vector<byte> sym_key = hash.final();
return sym_key;
}
}
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