// Key factory
bool BotanDH::generateKeyPair(AsymmetricKeyPair** ppKeyPair, AsymmetricParameters* parameters, RNG* /*rng = NULL */)
{
// Check parameters
if ((ppKeyPair == NULL) ||
(parameters == NULL))
{
return false;
}
if (!parameters->areOfType(DHParameters::type))
{
ERROR_MSG("Invalid parameters supplied for DH key generation");
return false;
}
DHParameters* params = (DHParameters*) parameters;
// Generate the key-pair
BotanDH_PrivateKey* dh = NULL;
try
{
BotanRNG* rng = (BotanRNG*)BotanCryptoFactory::i()->getRNG();
// PKCS#3: 2^(l-1) <= x < 2^l
Botan::BigInt x;
if (params->getXBitLength() > 0)
{
x.randomize(*rng->getRNG(), params->getXBitLength());
}
dh = new BotanDH_PrivateKey(*rng->getRNG(),
Botan::DL_Group(BotanUtil::byteString2bigInt(params->getP()),
BotanUtil::byteString2bigInt(params->getG())),
x);
}
catch (std::exception& e)
{
ERROR_MSG("DH key generation failed with %s", e.what());
return false;
}
// Create an asymmetric key-pair object to return
BotanDHKeyPair* kp = new BotanDHKeyPair();
((BotanDHPublicKey*) kp->getPublicKey())->setFromBotan(dh);
((BotanDHPrivateKey*) kp->getPrivateKey())->setFromBotan(dh);
*ppKeyPair = kp;
// Release the key
delete dh;
return true;
}
// Key factory
bool BotanDH::generateKeyPair(AsymmetricKeyPair** ppKeyPair, AsymmetricParameters* parameters, RNG* rng /* = NULL */)
{
// Check parameters
if ((ppKeyPair == NULL) ||
(parameters == NULL))
{
return false;
}
if (!parameters->areOfType(DHParameters::type))
{
ERROR_MSG("Invalid parameters supplied for DH key generation");
return false;
}
DHParameters* params = (DHParameters*) parameters;
// Generate the key-pair
Botan::DH_PrivateKey* dh = NULL;
try
{
BotanRNG* rng = (BotanRNG*)BotanCryptoFactory::i()->getRNG();
dh = new Botan::DH_PrivateKey(*rng->getRNG(),
Botan::DL_Group(BotanUtil::byteString2bigInt(params->getP()),
BotanUtil::byteString2bigInt(params->getG())));
}
catch (...)
{
ERROR_MSG("DH key generation failed");
return false;
}
// Create an asymmetric key-pair object to return
BotanDHKeyPair* kp = new BotanDHKeyPair();
((BotanDHPublicKey*) kp->getPublicKey())->setFromBotan(dh);
((BotanDHPrivateKey*) kp->getPrivateKey())->setFromBotan(dh);
*ppKeyPair = kp;
// Release the key
delete dh;
return true;
}
bool BotanDH::reconstructKeyPair(AsymmetricKeyPair** ppKeyPair, ByteString& serialisedData)
{
// Check input
if ((ppKeyPair == NULL) ||
(serialisedData.size() == 0))
{
return false;
}
ByteString dPub = ByteString::chainDeserialise(serialisedData);
ByteString dPriv = ByteString::chainDeserialise(serialisedData);
BotanDHKeyPair* kp = new BotanDHKeyPair();
bool rv = true;
if (!((DHPublicKey*) kp->getPublicKey())->deserialise(dPub))
{
rv = false;
}
if (!((DHPrivateKey*) kp->getPrivateKey())->deserialise(dPriv))
{
rv = false;
}
if (!rv)
{
delete kp;
return false;
}
*ppKeyPair = kp;
return true;
}
