bool BotanRSA::reconstructPrivateKey(PrivateKey** ppPrivateKey, ByteString& serialisedData)
{
// Check input
if ((ppPrivateKey == NULL) ||
(serialisedData.size() == 0))
{
return false;
}
BotanRSAPrivateKey* priv = new BotanRSAPrivateKey();
if (!priv->deserialise(serialisedData))
{
delete priv;
return false;
}
*ppPrivateKey = priv;
return true;
}
// Decryption functions
bool BotanRSA::decrypt(PrivateKey* privateKey, const ByteString& encryptedData,
ByteString& data, const AsymMech::Type padding)
{
// Check if the private key is the right type
if (!privateKey->isOfType(BotanRSAPrivateKey::type))
{
ERROR_MSG("Invalid key type supplied");
return false;
}
std::string eme;
switch (padding)
{
case AsymMech::RSA_PKCS:
eme = "PKCS1v15";
break;
case AsymMech::RSA_PKCS_OAEP:
eme = "EME1(SHA-160)";
break;
case AsymMech::RSA:
eme = "Raw";
break;
default:
ERROR_MSG("Invalid padding mechanism supplied (%i)", padding);
return false;
}
BotanRSAPrivateKey* pk = (BotanRSAPrivateKey*) privateKey;
Botan::RSA_PrivateKey* botanKey = pk->getBotanKey();
if (!botanKey)
{
ERROR_MSG("Could not get the Botan private key");
return false;
}
Botan::PK_Decryptor_EME* decryptor = NULL;
try
{
decryptor = new Botan::PK_Decryptor_EME(*botanKey, eme);
}
catch (...)
{
ERROR_MSG("Could not create the decryptor token");
return false;
}
// Perform the decryption operation
#if BOTAN_VERSION_MINOR == 11
Botan::secure_vector<Botan::byte> decResult;
#else
Botan::SecureVector<Botan::byte> decResult;
#endif
try
{
decResult = decryptor->decrypt(encryptedData.const_byte_str(), encryptedData.size());
}
catch (...)
{
ERROR_MSG("Could not decrypt the data");
delete decryptor;
return false;
}
// Return the result
if (padding == AsymMech::RSA)
{
// We compensate that Botan removes leading zeros
int modSize = pk->getN().size();
int decSize = decResult.size();
data.resize(modSize);
#if BOTAN_VERSION_MINOR == 11
memcpy(&data[0] + modSize - decSize, decResult.data(), decSize);
#else
memcpy(&data[0] + modSize - decSize, decResult.begin(), decSize);
#endif
}
else
{
data.resize(decResult.size());
#if BOTAN_VERSION_MINOR == 11
memcpy(&data[0], decResult.data(), decResult.size());
#else
memcpy(&data[0], decResult.begin(), decResult.size());
#endif
}
delete decryptor;
return true;
}
// Signing functions
bool BotanRSA::sign(PrivateKey* privateKey, const ByteString& dataToSign,
ByteString& signature, const AsymMech::Type mechanism,
const void* param /* = NULL */, const size_t paramLen /* = 0 */)
{
std::string emsa = "";
switch (mechanism)
{
case AsymMech::RSA:
emsa = "Raw";
break;
case AsymMech::RSA_PKCS:
emsa = "EMSA3(Raw)";
break;
default:
// Call default implementation
return AsymmetricAlgorithm::sign(privateKey, dataToSign, signature, mechanism, param, paramLen);
}
// Check if the private key is the right type
if (!privateKey->isOfType(BotanRSAPrivateKey::type))
{
ERROR_MSG("Invalid key type supplied");
return false;
}
BotanRSAPrivateKey* pk = (BotanRSAPrivateKey*) privateKey;
Botan::RSA_PrivateKey* botanKey = pk->getBotanKey();
if (!botanKey)
{
ERROR_MSG("Could not get the Botan private key");
return false;
}
try
{
signer = new Botan::PK_Signer(*botanKey, emsa);
// Should we add DISABLE_FAULT_PROTECTION? Makes this operation faster.
}
catch (...)
{
ERROR_MSG("Could not create the signer token");
return false;
}
// Perform the signature operation
#if BOTAN_VERSION_MINOR == 11
std::vector<Botan::byte> signResult;
#else
Botan::SecureVector<Botan::byte> signResult;
#endif
try
{
BotanRNG* rng = (BotanRNG*)BotanCryptoFactory::i()->getRNG();
signResult = signer->sign_message(dataToSign.const_byte_str(), dataToSign.size(), *rng->getRNG());
}
catch (std::exception& e)
{
ERROR_MSG("Could not sign the data: %s", e.what());
delete signer;
signer = NULL;
return false;
}
// Return the result
signature.resize(signResult.size());
#if BOTAN_VERSION_MINOR == 11
memcpy(&signature[0], signResult.data(), signResult.size());
#else
memcpy(&signature[0], signResult.begin(), signResult.size());
#endif
delete signer;
signer = NULL;
return true;
}
bool BotanRSA::signInit(PrivateKey* privateKey, const AsymMech::Type mechanism,
const void* param /* = NULL */, const size_t paramLen /* = 0 */)
{
if (!AsymmetricAlgorithm::signInit(privateKey, mechanism, param, paramLen))
{
return false;
}
// Check if the private key is the right type
if (!privateKey->isOfType(BotanRSAPrivateKey::type))
{
ERROR_MSG("Invalid key type supplied");
ByteString dummy;
AsymmetricAlgorithm::signFinal(dummy);
return false;
}
std::string emsa;
std::ostringstream request;
size_t sLen;
switch (mechanism)
{
case AsymMech::RSA_MD5_PKCS:
emsa = "EMSA3(MD5)";
break;
case AsymMech::RSA_SHA1_PKCS:
emsa = "EMSA3(SHA-160)";
break;
case AsymMech::RSA_SHA224_PKCS:
emsa = "EMSA3(SHA-224)";
break;
case AsymMech::RSA_SHA256_PKCS:
emsa = "EMSA3(SHA-256)";
break;
case AsymMech::RSA_SHA384_PKCS:
emsa = "EMSA3(SHA-384)";
break;
case AsymMech::RSA_SHA512_PKCS:
emsa = "EMSA3(SHA-512)";
break;
case AsymMech::RSA_SHA1_PKCS_PSS:
if (param == NULL || paramLen != sizeof(RSA_PKCS_PSS_PARAMS) ||
((RSA_PKCS_PSS_PARAMS*) param)->hashAlg != HashAlgo::SHA1 ||
((RSA_PKCS_PSS_PARAMS*) param)->mgf != AsymRSAMGF::MGF1_SHA1)
{
ERROR_MSG("Invalid parameters");
ByteString dummy;
AsymmetricAlgorithm::signFinal(dummy);
return false;
}
sLen = ((RSA_PKCS_PSS_PARAMS*) param)->sLen;
if (sLen > ((privateKey->getBitLength()+6)/8-2-20))
{
ERROR_MSG("sLen (%lu) is too large for current key size (%lu)",
(unsigned long)sLen, privateKey->getBitLength());
ByteString dummy;
AsymmetricAlgorithm::signFinal(dummy);
return false;
}
request << "EMSA4(SHA-160,MGF1," << sLen << ")";
emsa = request.str();
break;
case AsymMech::RSA_SHA224_PKCS_PSS:
if (param == NULL || paramLen != sizeof(RSA_PKCS_PSS_PARAMS) ||
((RSA_PKCS_PSS_PARAMS*) param)->hashAlg != HashAlgo::SHA224 ||
((RSA_PKCS_PSS_PARAMS*) param)->mgf != AsymRSAMGF::MGF1_SHA224)
{
ERROR_MSG("Invalid parameters");
ByteString dummy;
AsymmetricAlgorithm::signFinal(dummy);
return false;
}
sLen = ((RSA_PKCS_PSS_PARAMS*) param)->sLen;
if (sLen > ((privateKey->getBitLength()+6)/8-2-28))
{
ERROR_MSG("sLen (%lu) is too large for current key size (%lu)",
(unsigned long)sLen, privateKey->getBitLength());
ByteString dummy;
AsymmetricAlgorithm::signFinal(dummy);
return false;
}
request << "EMSA4(SHA-224,MGF1," << sLen << ")";
emsa = request.str();
break;
case AsymMech::RSA_SHA256_PKCS_PSS:
if (param == NULL || paramLen != sizeof(RSA_PKCS_PSS_PARAMS) ||
((RSA_PKCS_PSS_PARAMS*) param)->hashAlg != HashAlgo::SHA256 ||
((RSA_PKCS_PSS_PARAMS*) param)->mgf != AsymRSAMGF::MGF1_SHA256)
{
ERROR_MSG("Invalid parameters");
ByteString dummy;
AsymmetricAlgorithm::signFinal(dummy);
return false;
}
sLen = ((RSA_PKCS_PSS_PARAMS*) param)->sLen;
if (sLen > ((privateKey->getBitLength()+6)/8-2-32))
{
ERROR_MSG("sLen (%lu) is too large for current key size (%lu)",
(unsigned long)sLen, privateKey->getBitLength());
ByteString dummy;
AsymmetricAlgorithm::signFinal(dummy);
return false;
}
request << "EMSA4(SHA-256,MGF1," << sLen << ")";
emsa = request.str();
break;
case AsymMech::RSA_SHA384_PKCS_PSS:
if (param == NULL || paramLen != sizeof(RSA_PKCS_PSS_PARAMS) ||
((RSA_PKCS_PSS_PARAMS*) param)->hashAlg != HashAlgo::SHA384 ||
((RSA_PKCS_PSS_PARAMS*) param)->mgf != AsymRSAMGF::MGF1_SHA384)
{
ERROR_MSG("Invalid parameters");
ByteString dummy;
AsymmetricAlgorithm::signFinal(dummy);
return false;
}
sLen = ((RSA_PKCS_PSS_PARAMS*) param)->sLen;
if (sLen > ((privateKey->getBitLength()+6)/8-2-48))
{
ERROR_MSG("sLen (%lu) is too large for current key size (%lu)",
(unsigned long)sLen, privateKey->getBitLength());
ByteString dummy;
AsymmetricAlgorithm::signFinal(dummy);
return false;
}
request << "EMSA4(SHA-384,MGF1," << sLen << ")";
emsa = request.str();
break;
case AsymMech::RSA_SHA512_PKCS_PSS:
if (param == NULL || paramLen != sizeof(RSA_PKCS_PSS_PARAMS) ||
((RSA_PKCS_PSS_PARAMS*) param)->hashAlg != HashAlgo::SHA512 ||
((RSA_PKCS_PSS_PARAMS*) param)->mgf != AsymRSAMGF::MGF1_SHA512)
{
ERROR_MSG("Invalid parameters");
ByteString dummy;
AsymmetricAlgorithm::signFinal(dummy);
return false;
}
sLen = ((RSA_PKCS_PSS_PARAMS*) param)->sLen;
if (sLen > ((privateKey->getBitLength()+6)/8-2-64))
{
ERROR_MSG("sLen (%lu) is too large for current key size (%lu)",
(unsigned long)sLen, privateKey->getBitLength());
ByteString dummy;
AsymmetricAlgorithm::signFinal(dummy);
return false;
}
request << "EMSA4(SHA-512,MGF1," << sLen << ")";
emsa = request.str();
break;
case AsymMech::RSA_SSL:
emsa = "EMSA3(Parallel(MD5,SHA-160))";
break;
default:
ERROR_MSG("Invalid mechanism supplied (%i)", mechanism);
ByteString dummy;
AsymmetricAlgorithm::signFinal(dummy);
return false;
}
BotanRSAPrivateKey* pk = (BotanRSAPrivateKey*) currentPrivateKey;
Botan::RSA_PrivateKey* botanKey = pk->getBotanKey();
if (!botanKey)
{
ERROR_MSG("Could not get the Botan private key");
ByteString dummy;
AsymmetricAlgorithm::signFinal(dummy);
return false;
}
try
{
signer = new Botan::PK_Signer(*botanKey, emsa);
// Should we add DISABLE_FAULT_PROTECTION? Makes this operation faster.
}
catch (...)
{
ERROR_MSG("Could not create the signer token");
ByteString dummy;
AsymmetricAlgorithm::signFinal(dummy);
return false;
}
return true;
}
// Decryption functions
bool BotanRSA::decrypt(PrivateKey* privateKey, const ByteString& encryptedData, ByteString& data, const std::string padding)
{
// Check if the private key is the right type
if (!privateKey->isOfType(BotanRSAPrivateKey::type))
{
ERROR_MSG("Invalid key type supplied");
return false;
}
std::string lowerPadding;
lowerPadding.resize(padding.size());
std::transform(padding.begin(), padding.end(), lowerPadding.begin(), tolower);
std::string eme;
if (!lowerPadding.compare("rsa-pkcs"))
{
eme = "PKCS1v15";
}
else if (!lowerPadding.compare("rsa-pkcs-oaep"))
{
eme = "EME1(SHA-160)";
}
else if (!lowerPadding.compare("rsa-raw"))
{
eme = "Raw";
}
else
{
ERROR_MSG("Invalid padding mechanism supplied (%s)", padding.c_str());
return false;
}
BotanRSAPrivateKey* pk = (BotanRSAPrivateKey*) privateKey;
Botan::RSA_PrivateKey* botanKey = pk->getBotanKey();
if (!botanKey)
{
ERROR_MSG("Could not get the Botan private key");
return false;
}
Botan::PK_Decryptor_EME* decryptor = NULL;
try
{
decryptor = new Botan::PK_Decryptor_EME(*botanKey, eme);
}
catch (...)
{
ERROR_MSG("Could not create the decryptor token");
return false;
}
// Perform the decryption operation
Botan::SecureVector<Botan::byte> decResult;
try
{
decResult = decryptor->decrypt(encryptedData.const_byte_str(), encryptedData.size());
}
catch (...)
{
ERROR_MSG("Could not decrypt the data");
delete decryptor;
return false;
}
// Return the result
if (!eme.compare("Raw"))
{
// We compensate that Botan removes leading zeros
int modSize = pk->getN().size();
int decSize = decResult.size();
data.resize(modSize);
memcpy(&data[0] + modSize - decSize, decResult.begin(), decSize);
}
else
{
data.resize(decResult.size());
memcpy(&data[0], decResult.begin(), decResult.size());
}
delete decryptor;
return true;
}
// Signing functions
bool BotanRSA::sign(PrivateKey* privateKey, const ByteString& dataToSign, 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("rsa-pkcs"))
{
emsa = "EMSA3(Raw)";
}
else if (!lowerMechanism.compare("rsa-raw"))
{
emsa = "Raw";
}
else
{
// Call default implementation
return AsymmetricAlgorithm::sign(privateKey, dataToSign, signature, mechanism);
}
// Check if the private key is the right type
if (!privateKey->isOfType(BotanRSAPrivateKey::type))
{
ERROR_MSG("Invalid key type supplied");
return false;
}
BotanRSAPrivateKey* pk = (BotanRSAPrivateKey*) privateKey;
Botan::RSA_PrivateKey* botanKey = pk->getBotanKey();
if (!botanKey)
{
ERROR_MSG("Could not get the Botan private key");
return false;
}
try
{
signer = new Botan::PK_Signer(*botanKey, emsa);
// Should we add DISABLE_FAULT_PROTECTION? Makes this operation faster.
}
catch (...)
{
ERROR_MSG("Could not create the signer token");
return false;
}
// Perform the signature operation
Botan::SecureVector<Botan::byte> signResult;
try
{
BotanRNG* rng = (BotanRNG*)BotanCryptoFactory::i()->getRNG();
signResult = signer->sign_message(dataToSign.const_byte_str(), dataToSign.size(), *rng->getRNG());
}
catch (...)
{
ERROR_MSG("Could not sign the data");
delete signer;
signer = NULL;
return false;
}
// Return the result
signature.resize(signResult.size());
memcpy(&signature[0], signResult.begin(), signResult.size());
delete signer;
signer = NULL;
return true;
}
bool BotanRSA::signInit(PrivateKey* privateKey, const std::string mechanism)
{
if (!AsymmetricAlgorithm::signInit(privateKey, mechanism))
{
return false;
}
// Check if the private key is the right type
if (!privateKey->isOfType(BotanRSAPrivateKey::type))
{
ERROR_MSG("Invalid key type supplied");
ByteString dummy;
AsymmetricAlgorithm::signFinal(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("rsa-md5-pkcs"))
{
emsa = "EMSA3(MD5)";
}
else if (!lowerMechanism.compare("rsa-sha1-pkcs"))
{
emsa = "EMSA3(SHA-160)";
}
else if (!lowerMechanism.compare("rsa-sha224-pkcs"))
{
emsa = "EMSA3(SHA-224)";
}
else if (!lowerMechanism.compare("rsa-sha256-pkcs"))
{
emsa = "EMSA3(SHA-256)";
}
else if (!lowerMechanism.compare("rsa-sha384-pkcs"))
{
emsa = "EMSA3(SHA-384)";
}
else if (!lowerMechanism.compare("rsa-sha512-pkcs"))
{
emsa = "EMSA3(SHA-512)";
}
else if (!lowerMechanism.compare("rsa-ssl"))
{
emsa = "EMSA3(Parallel(MD5,SHA-160))";
}
else
{
ERROR_MSG("Invalid mechanism supplied (%s)", mechanism.c_str());
ByteString dummy;
AsymmetricAlgorithm::signFinal(dummy);
return false;
}
BotanRSAPrivateKey* pk = (BotanRSAPrivateKey*) currentPrivateKey;
Botan::RSA_PrivateKey* botanKey = pk->getBotanKey();
if (!botanKey)
{
ERROR_MSG("Could not get the Botan private key");
ByteString dummy;
AsymmetricAlgorithm::signFinal(dummy);
return false;
}
try
{
signer = new Botan::PK_Signer(*botanKey, emsa);
// Should we add DISABLE_FAULT_PROTECTION? Makes this operation faster.
}
catch (...)
{
ERROR_MSG("Could not create the signer token");
ByteString dummy;
AsymmetricAlgorithm::signFinal(dummy);
return false;
}
return true;
}
