blowfish.h

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/*
* Blowfish
* (C) 1999-2011 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#ifndef BOTAN_BLOWFISH_H_
#define BOTAN_BLOWFISH_H_
 
#include <botan/block_cipher.h>
#include <botan/secmem.h>
 
namespace Botan {
 
/**
* Blowfish
*/
class BOTAN_TEST_API Blowfish final : public Block_Cipher_Fixed_Params<8, 1, 56> {
   public:
      void encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;
      void decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;
 
      /**
      * Modified EKSBlowfish key schedule, used for bcrypt password hashing
      */
      void salted_set_key(const uint8_t key[],
                          size_t key_length,
                          const uint8_t salt[],
                          size_t salt_length,
                          size_t workfactor,
                          bool salt_first = false);
 
      void clear() override;
 
      std::string name() const override { return "Blowfish"; }
 
      std::unique_ptr<BlockCipher> new_object() const override { return std::make_unique<Blowfish>(); }
 
      bool has_keying_material() const override;
 
   private:
      void key_schedule(std::span<const uint8_t> key) override;
 
      void key_expansion(const uint8_t key[], size_t key_length, const uint8_t salt[], size_t salt_length);
 
      void generate_sbox(secure_vector<uint32_t>& box,
                         uint32_t& L,
                         uint32_t& R,
                         const uint8_t salt[],
                         size_t salt_length,
                         size_t salt_off) const;
 
      secure_vector<uint32_t> m_S, m_P;
};
 
}  // namespace Botan
 
#endif