bool BotanDSA::reconstructPublicKey(PublicKey** ppPublicKey, ByteString& serialisedData)
{
// Check input
if ((ppPublicKey == NULL) ||
(serialisedData.size() == 0))
{
return false;
}
BotanDSAPublicKey* pub = new BotanDSAPublicKey();
if (!pub->deserialise(serialisedData))
{
delete pub;
return false;
}
*ppPublicKey = pub;
return true;
}
bool BotanDSA::verifyInit(PublicKey* publicKey, const std::string mechanism)
{
if (!AsymmetricAlgorithm::verifyInit(publicKey, mechanism))
{
return false;
}
// Check if the public key is the right type
if (!publicKey->isOfType(BotanDSAPublicKey::type))
{
ERROR_MSG("Invalid key type supplied");
ByteString dummy;
AsymmetricAlgorithm::verifyFinal(dummy);
return false;
}
std::string lowerMechanism;
lowerMechanism.resize(mechanism.size());
std::transform(mechanism.begin(), mechanism.end(), lowerMechanism.begin(), tolower);
std::string emsa;
if (!lowerMechanism.compare("dsa-sha1"))
{
emsa = "EMSA1(SHA-160)";
}
else if (!lowerMechanism.compare("dsa-sha224"))
{
emsa = "EMSA1(SHA-224)";
}
else if (!lowerMechanism.compare("dsa-sha256"))
{
emsa = "EMSA1(SHA-256)";
}
else if (!lowerMechanism.compare("dsa-sha384"))
{
emsa = "EMSA1(SHA-384)";
}
else if (!lowerMechanism.compare("dsa-sha512"))
{
emsa = "EMSA1(SHA-512)";
}
else
{
ERROR_MSG("Invalid mechanism supplied (%s)", mechanism.c_str());
ByteString dummy;
AsymmetricAlgorithm::verifyFinal(dummy);
return false;
}
BotanDSAPublicKey* pk = (BotanDSAPublicKey*) currentPublicKey;
Botan::DSA_PublicKey* botanKey = pk->getBotanKey();
if (!botanKey)
{
ERROR_MSG("Could not get the Botan public key");
ByteString dummy;
AsymmetricAlgorithm::verifyFinal(dummy);
return false;
}
try
{
verifier = new Botan::PK_Verifier(*botanKey, emsa);
}
catch (...)
{
ERROR_MSG("Could not create the verifier token");
ByteString dummy;
AsymmetricAlgorithm::verifyFinal(dummy);
return false;
}
return true;
}
bool BotanDSA::verifyInit(PublicKey* publicKey, const AsymMech::Type mechanism,
const void* param /* = NULL */, const size_t paramLen /* = 0 */)
{
if (!AsymmetricAlgorithm::verifyInit(publicKey, mechanism, param, paramLen))
{
return false;
}
// Check if the public key is the right type
if (!publicKey->isOfType(BotanDSAPublicKey::type))
{
ERROR_MSG("Invalid key type supplied");
ByteString dummy;
AsymmetricAlgorithm::verifyFinal(dummy);
return false;
}
std::string emsa;
switch (mechanism)
{
case AsymMech::DSA_SHA1:
emsa = "EMSA1(SHA-160)";
break;
case AsymMech::DSA_SHA224:
emsa = "EMSA1(SHA-224)";
break;
case AsymMech::DSA_SHA256:
emsa = "EMSA1(SHA-256)";
break;
case AsymMech::DSA_SHA384:
emsa = "EMSA1(SHA-384)";
break;
case AsymMech::DSA_SHA512:
emsa = "EMSA1(SHA-512)";
break;
default:
ERROR_MSG("Invalid mechanism supplied (%i)", mechanism);
ByteString dummy;
AsymmetricAlgorithm::verifyFinal(dummy);
return false;
}
BotanDSAPublicKey* pk = (BotanDSAPublicKey*) currentPublicKey;
Botan::DSA_PublicKey* botanKey = pk->getBotanKey();
if (!botanKey)
{
ERROR_MSG("Could not get the Botan public key");
ByteString dummy;
AsymmetricAlgorithm::verifyFinal(dummy);
return false;
}
try
{
verifier = new Botan::PK_Verifier(*botanKey, emsa);
}
catch (...)
{
ERROR_MSG("Could not create the verifier token");
ByteString dummy;
AsymmetricAlgorithm::verifyFinal(dummy);
return false;
}
return true;
}
// Verification functions
bool BotanDSA::verify(PublicKey* publicKey, const ByteString& originalData,
const ByteString& signature, const std::string mechanism)
{
std::string lowerMechanism;
lowerMechanism.resize(mechanism.size());
std::transform(mechanism.begin(), mechanism.end(), lowerMechanism.begin(), tolower);
std::string emsa;
if (!lowerMechanism.compare("dsa"))
{
emsa = "Raw";
}
else
{
// Call the generic function
return AsymmetricAlgorithm::verify(publicKey, originalData, signature, mechanism);
}
// Check if the public key is the right type
if (!publicKey->isOfType(BotanDSAPublicKey::type))
{
ERROR_MSG("Invalid key type supplied");
return false;
}
BotanDSAPublicKey* pk = (BotanDSAPublicKey*) publicKey;
Botan::DSA_PublicKey* botanKey = pk->getBotanKey();
if (!botanKey)
{
ERROR_MSG("Could not get the Botan public key");
return false;
}
try
{
verifier = new Botan::PK_Verifier(*botanKey, emsa);
}
catch (...)
{
ERROR_MSG("Could not create the verifier token");
return false;
}
// Perform the verify operation
bool verResult;
try
{
verResult = verifier->verify_message(originalData.const_byte_str(),
originalData.size(),
signature.const_byte_str(),
signature.size());
}
catch (...)
{
ERROR_MSG("Could not check the signature");
delete verifier;
verifier = NULL;
return false;
}
delete verifier;
verifier = NULL;
return verResult;
}
// Verification functions
bool BotanDSA::verify(PublicKey* publicKey, const ByteString& originalData,
const ByteString& signature, const AsymMech::Type mechanism,
const void* param /* = NULL */, const size_t paramLen /* = 0 */)
{
std::string emsa;
if (mechanism == AsymMech::DSA)
{
emsa = "Raw";
}
else
{
// Call the generic function
return AsymmetricAlgorithm::verify(publicKey, originalData, signature, mechanism, param, paramLen);
}
// Check if the public key is the right type
if (!publicKey->isOfType(BotanDSAPublicKey::type))
{
ERROR_MSG("Invalid key type supplied");
return false;
}
BotanDSAPublicKey* pk = (BotanDSAPublicKey*) publicKey;
Botan::DSA_PublicKey* botanKey = pk->getBotanKey();
if (!botanKey)
{
ERROR_MSG("Could not get the Botan public key");
return false;
}
try
{
verifier = new Botan::PK_Verifier(*botanKey, emsa);
}
catch (...)
{
ERROR_MSG("Could not create the verifier token");
return false;
}
// Perform the verify operation
bool verResult;
try
{
verResult = verifier->verify_message(originalData.const_byte_str(),
originalData.size(),
signature.const_byte_str(),
signature.size());
}
catch (...)
{
ERROR_MSG("Could not check the signature");
delete verifier;
verifier = NULL;
return false;
}
delete verifier;
verifier = NULL;
return verResult;
}