OpenSSLSymmetricCipherContext OpenSSLSymmetricCipher::start(OpenSSLSymmetricCipher::Method method, const SymmetricKey& key, const InitializationVector& iv, bool padding)
{
OpenSSLSymmetricCipherContext context(method);
int r = 0;
const EVP_CIPHER* evpCipher = getEVPCipher(key);
EXCEPTION_ASSERT(evpCipher, std::invalid_argument, "No cipher found that can use the supplied key");
switch (context.method())
{
case M_ENCRYPT:
{
r = EVP_EncryptInit_ex(context.ctx(), evpCipher, NULL, &key.data()[0], &iv.data()[0]);
break;
}
case M_DECRYPT:
{
r = EVP_DecryptInit_ex(context.ctx(), evpCipher, NULL, &key.data()[0], &iv.data()[0]);
break;
}
default:
{
THROW_EXCEPTION_WITH_LOG(std::runtime_error, "Unhandled method");
}
}
EXCEPTION_ASSERT_WITH_LOG(r == 1, OpenSSLException, "");
context.data().clear();
context.setPadding(padding);
return context;
}
/**
* \brief Comparaison operator.
* \param lhs The left argument.
* \param rhs The right argument.
* \return true if lhs is less than rhs.
*/
inline bool operator<(const SymmetricKey& lhs, const SymmetricKey& rhs)
{
return (lhs.data() < rhs.data());
}