bool BotanDSA::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 DSA key size is not supported");
return false;
}
Botan::DL_Group* group = NULL;
// Taken from OpenSSL
size_t qLen = bitLen >= 2048 ? 256 : 160;
try
{
BotanRNG* brng = (BotanRNG*)BotanCryptoFactory::i()->getRNG();
group = new Botan::DL_Group(*brng->getRNG(), Botan::DL_Group::Prime_Subgroup, bitLen, qLen);
}
catch (...)
{
ERROR_MSG("Failed to generate %d bit DSA parameters", bitLen);
return false;
}
// Store the DSA parameters
DSAParameters* params = new DSAParameters();
ByteString p = BotanUtil::bigInt2ByteString(group->get_p());
params->setP(p);
ByteString q = BotanUtil::bigInt2ByteString(group->get_q());
params->setQ(q);
ByteString g = BotanUtil::bigInt2ByteString(group->get_g());
params->setG(g);
*ppParams = params;
delete group;
return true;
}
bool OSSLDSA::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 DSA key size is not supported");
return false;
}
DSA* dsa = DSA_generate_parameters(bitLen, NULL, 0, NULL, NULL, NULL, NULL);
if (dsa == NULL)
{
ERROR_MSG("Failed to generate %d bit DSA parameters", bitLen);
return false;
}
// Store the DSA parameters
DSAParameters* params = new DSAParameters();
ByteString p = OSSL::bn2ByteString(dsa->p); params->setP(p);
ByteString q = OSSL::bn2ByteString(dsa->q); params->setQ(q);
ByteString g = OSSL::bn2ByteString(dsa->g); params->setG(g);
*ppParams = params;
DSA_free(dsa);
return true;
}