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/*
* Salsa20 / XSalsa20
* (C) 1999-2010 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_SALSA20_H_
#define BOTAN_SALSA20_H_
#include <botan/stream_cipher.h>
namespace Botan {
/**
* DJB's Salsa20 (and XSalsa20)
*/
class BOTAN_PUBLIC_API(2,0) Salsa20 final : public StreamCipher
{
public:
void cipher(const uint8_t in[], uint8_t out[], size_t length) override;
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 || iv_len == 8 || iv_len == 24); }
Key_Length_Specification key_spec() const override
{
return Key_Length_Specification(16, 32, 16);
}
void clear() override;
std::string name() const override;
StreamCipher* clone() const override { return new Salsa20; }
static void salsa_core(uint8_t output[64], const uint32_t input[16], size_t rounds);
void seek(uint64_t offset) override;
private:
void key_schedule(const uint8_t key[], size_t key_len) override;
void initialize_state();
secure_vector<uint32_t> m_key;
secure_vector<uint32_t> m_state;
secure_vector<uint8_t> m_buffer;
size_t m_position = 0;
};
}
#endif
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