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/*
* SHAKE-128 as a stream cipher
* (C) 2016 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_SHAKE128_CIPHER_H__
#define BOTAN_SHAKE128_CIPHER_H__
#include <botan/stream_cipher.h>
#include <botan/secmem.h>
namespace Botan {
/**
* SHAKE-128 XOF presented as a stream cipher
*/
class BOTAN_DLL SHAKE_128_Cipher final : public StreamCipher
{
public:
SHAKE_128_Cipher();
/**
* Produce more XOF output
*/
void cipher(const uint8_t in[], uint8_t out[], size_t length) override;
/**
* Seeking is not supported, this function will throw
*/
void seek(uint64_t offset) override;
/**
* IV not supported, this function will throw unless iv_len == 0
*/
void set_iv(const uint8_t iv[], size_t iv_len) override;
bool valid_iv_length(size_t iv_len) const override { return (iv_len == 0); }
/**
* In principle SHAKE can accept arbitrary length inputs, but this
* does not seem required for a stream cipher.
*/
Key_Length_Specification key_spec() const override
{
return Key_Length_Specification(16, 160, 8);
}
void clear() override;
std::string name() const override { return "SHAKE-128"; }
StreamCipher* clone() const override { return new SHAKE_128_Cipher; }
private:
void key_schedule(const uint8_t key[], size_t key_len) override;
secure_vector<uint64_t> m_state; // internal state
secure_vector<uint8_t> m_buffer; // ciphertext buffer
size_t m_buf_pos; // position in m_buffer
};
}
#endif
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