salsa20.h - mozsearch

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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>

BOTAN_FUTURE_INTERNAL_HEADER(salsa20.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;

      size_t default_iv_length() const override;

      Key_Length_Specification key_spec() const override;

      void clear() override;

      std::string name() const override;

      StreamCipher* clone() const override;

      static void salsa_core(uint8_t output[64], const uint32_t input[16], size_t rounds);

      static void hsalsa20(uint32_t output[8], const uint32_t input[16]);

      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