/*
* Set new tweak
*/
void XTS_Decryption::set_iv(const InitializationVector& iv)
{
if(iv.length() != tweak.size())
throw Invalid_IV_Length(name(), iv.length());
tweak = iv.bits_of();
cipher2->encrypt(tweak);
}
void Transform_Filter::Nonce_State::update(const InitializationVector& iv)
{
m_nonce = unlock(iv.bits_of());
m_fresh_nonce = true;
}
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;
}
void Keyed_Filter::set_iv(const InitializationVector& iv)
{
if(iv.length() != 0)
throw Invalid_IV_Length(name(), iv.length());
}
/*
* Set the EAX nonce
*/
void EAX_Base::set_iv(const InitializationVector& iv)
{
nonce_mac = eax_prf(0, BLOCK_SIZE, cmac, iv.begin(), iv.length());
ctr->set_iv(&nonce_mac[0], nonce_mac.size());
}
