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/*
* Keypair Checks
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/keypair.h>
#include <botan/look_pk.h>
#include <memory>
namespace Botan {
namespace KeyPair {
/*
* Check an encryption key pair for consistency
*/
void check_key(RandomNumberGenerator& rng,
PK_Encryptor* encryptor, PK_Decryptor* decryptor)
{
if(encryptor->maximum_input_size() == 0)
return;
std::unique_ptr<PK_Encryptor> enc(encryptor);
std::unique_ptr<PK_Decryptor> dec(decryptor);
SecureVector<byte> message(enc->maximum_input_size() - 1);
rng.randomize(message, message.size());
SecureVector<byte> ciphertext = enc->encrypt(message, rng);
if(ciphertext == message)
throw Self_Test_Failure("Encryption key pair consistency failure");
SecureVector<byte> message2 = dec->decrypt(ciphertext);
if(message != message2)
throw Self_Test_Failure("Encryption key pair consistency failure");
}
/*
* Check a signature key pair for consistency
*/
void check_key(RandomNumberGenerator& rng,
PK_Signer* signer, PK_Verifier* verifier)
{
std::unique_ptr<PK_Signer> sig(signer);
std::unique_ptr<PK_Verifier> ver(verifier);
SecureVector<byte> message(16);
rng.randomize(message, message.size());
SecureVector<byte> signature;
try
{
signature = sig->sign_message(message, rng);
}
catch(Encoding_Error)
{
return;
}
if(!ver->verify_message(message, signature))
throw Self_Test_Failure("Signature key pair consistency failure");
++message[0];
if(ver->verify_message(message, signature))
throw Self_Test_Failure("Signature key pair consistency failure");
}
}
}
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