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/*
* (C) 2015 Jack Lloyd
* (C) 2016 Daniel Neus, Rohde & Schwarz Cybersecurity
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_STREAM_MODE_H_
#define BOTAN_STREAM_MODE_H_
#include <botan/cipher_mode.h>
#if defined(BOTAN_HAS_STREAM_CIPHER)
#include <botan/stream_cipher.h>
#endif
namespace Botan {
#if defined(BOTAN_HAS_STREAM_CIPHER)
class BOTAN_PUBLIC_API(2,0) Stream_Cipher_Mode final : public Cipher_Mode
{
public:
/**
* @param cipher underyling stream cipher
*/
explicit Stream_Cipher_Mode(StreamCipher* cipher) : m_cipher(cipher) {}
size_t process(uint8_t buf[], size_t sz) override
{
m_cipher->cipher1(buf, sz);
return sz;
}
void finish(secure_vector<uint8_t>& buf, size_t offset) override
{ return update(buf, offset); }
size_t output_length(size_t input_length) const override { return input_length; }
size_t update_granularity() const override { return 1; }
size_t minimum_final_size() const override { return 0; }
size_t default_nonce_length() const override { return 0; }
bool valid_nonce_length(size_t nonce_len) const override
{ return m_cipher->valid_iv_length(nonce_len); }
Key_Length_Specification key_spec() const override { return m_cipher->key_spec(); }
std::string name() const override { return m_cipher->name(); }
void clear() override
{
m_cipher->clear();
reset();
}
void reset() override { /* no msg state */ }
private:
void start_msg(const uint8_t nonce[], size_t nonce_len) override
{
if(nonce_len > 0)
{
m_cipher->set_iv(nonce, nonce_len);
}
}
void key_schedule(const uint8_t key[], size_t length) override
{
m_cipher->set_key(key, length);
}
std::unique_ptr<StreamCipher> m_cipher;
};
#endif
}
#endif
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