md5.h

/* MD5
 converted to C++ class by Frank Thilo (thilo@unix-ag.org)
 for bzflag (http://www.bzflag.org)
 
   based on:
 
   md5.h and md5.c
   reference implementation of RFC 1321
 
   Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
rights reserved.
 
License to copy and use this software is granted provided that it
is identified as the "RSA Data Security, Inc. MD5 Message-Digest
Algorithm" in all material mentioning or referencing this software
or this function.
 
License is also granted to make and use derivative works provided
that such works are identified as "derived from the RSA Data
Security, Inc. MD5 Message-Digest Algorithm" in all material
mentioning or referencing the derived work.
 
RSA Data Security, Inc. makes no representations concerning either
the merchantability of this software or the suitability of this
software for any particular purpose. It is provided "as is"
without express or implied warranty of any kind.
 
These notices must be retained in any copies of any part of this
documentation and/or software.
 
*/
 
#pragma once
 
#include <sptk5/sptk.h>
#include <sptk5/String.h>
#include <iostream>
#include "Buffer.h"
 
namespace sptk {
 
    class SP_EXPORT MD5
    {
    public:
        using size_type = unsigned int; // must be 32bit
 
        MD5();
 
        explicit MD5(const Buffer& data);
 
        void update(const unsigned char* buffer, size_type length);
 
        void update(const char* buffer, size_type length);
 
        MD5& finalize();
 
        String hexdigest() const;
 
        friend std::ostream& operator<<(std::ostream&, MD5 md5);
 
    private:
 
        void init();
 
        using uint1 = uint8_t;
 
        using uint4 = uint32_t;
 
        static constexpr int blocksize = 64;
 
        void transform(const uint1* block);
 
        static void decode(uint4* output, const uint1* input, size_type len);
 
        static void encode(uint1* output, const uint4* input, size_type len);
 
      bool finalized {false};
 
      std::array<uint1, blocksize> buffer {};
 
      std::array<uint4, 2> count {};
 
      std::array<uint4, 4> state {};
 
      std::array<uint1, 16> digest {};
 
 
        // low level logic operations
        static inline uint4 F(uint4 x, uint4 y, uint4 z);
 
        static inline uint4 G(uint4 x, uint4 y, uint4 z);
 
        static inline uint4 H(uint4 x, uint4 y, uint4 z);
 
        static inline uint4 I(uint4 x, uint4 y, uint4 z);
 
        static inline uint4 rotate_left(uint4 x, int n);
 
        static inline void FF(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
 
        static inline void GG(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
 
        static inline void HH(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
 
        static inline void II(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
    };
 
   SP_EXPORT String md5(const Buffer& data);
 
   SP_EXPORT String md5(const String& data);
 
}