bool BotanDH::generateParameters(AsymmetricParameters** ppParams, void* parameters /* = NULL */, RNG* rng /* = NULL*/)
{
if ((ppParams == NULL) || (parameters == NULL))
{
return false;
}
size_t bitLen = (size_t) parameters;
if (bitLen < getMinKeySize() || bitLen > getMaxKeySize())
{
ERROR_MSG("This DH key size is not supported");
return false;
}
Botan::DL_Group* group = NULL;
try
{
BotanRNG* brng = (BotanRNG*)BotanCryptoFactory::i()->getRNG();
group = new Botan::DL_Group(*brng->getRNG(), Botan::DL_Group::Strong, bitLen);
}
catch (...)
{
ERROR_MSG("Failed to generate %d bit DH parameters", bitLen);
return false;
}
// Store the DH parameters
DHParameters* params = new DHParameters();
ByteString p = BotanUtil::bigInt2ByteString(group->get_p());
params->setP(p);
ByteString g = BotanUtil::bigInt2ByteString(group->get_g());
params->setG(g);
*ppParams = params;
delete group;
return true;
}
bool OSSLDH::generateParameters(AsymmetricParameters** ppParams, void* parameters /* = NULL */, RNG* rng /* = NULL*/)
{
if ((ppParams == NULL) || (parameters == NULL))
{
return false;
}
size_t bitLen = (size_t) parameters;
if (bitLen < getMinKeySize() || bitLen > getMaxKeySize())
{
ERROR_MSG("This DH key size is not supported");
return false;
}
DH* dh = DH_generate_parameters(bitLen, 2, NULL, NULL);
if (dh == NULL)
{
ERROR_MSG("Failed to generate %d bit DH parameters", bitLen);
return false;
}
// Store the DH parameters
DHParameters* params = new DHParameters();
ByteString p = OSSL::bn2ByteString(dh->p); params->setP(p);
ByteString g = OSSL::bn2ByteString(dh->g); params->setG(g);
*ppParams = params;
DH_free(dh);
return true;
}