MD5.h

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/*
 * Copyright(c) Sophist Solutions, Inc. 1990-2025.  All rights reserved
 */
#ifndef _Stroika_Foundation_Cryptography_Digest_MD5_h_
#define _Stroika_Foundation_Cryptography_Digest_MD5_h_ 1
 
#include "Stroika/Foundation/StroikaPreComp.h"
 
#include "Stroika/Foundation/Cryptography/Digest/Digester.h"
#include "Stroika/Foundation/Cryptography/Digest/ResultTypes.h"
 
/**
 *  \file
 *
 *  \note Code-Status:  <a href="Code-Status.md#Beta">Beta</a>
 *
 */
 
namespace Stroika::Foundation::Cryptography::Digest::Algorithm {
 
    /**
     *  Algorithm 'type tag' indicating this particular algorithm.
     */
    struct MD5 {};
 
    /**
     *  Traits for the MD5 algorithm.
     */
    template <>
    struct DigesterDefaultTraitsForAlgorithm<MD5> {
        using ReturnType = Result128BitType;
    };
 
    /**
     *  \brief Windowing digester (code to do the digest algorithm) for the MD5 algorithm.
     */
    template <>
    class DigesterAlgorithm<MD5> : public IDigestAlgorithm<DigesterDefaultTraitsForAlgorithm<MD5>::ReturnType> {
    public:
        using ReturnType = DigesterDefaultTraitsForAlgorithm<MD5>::ReturnType;
 
    public:
        DigesterAlgorithm ();
        DigesterAlgorithm (const DigesterAlgorithm& src) = default;
 
    public:
        nonvirtual DigesterAlgorithm& operator= (const DigesterAlgorithm& rhs) = default;
 
    public:
        virtual void Write (const byte* start, const byte* end) override;
 
    public:
        virtual ReturnType Complete () override;
 
    private:
        using UINT4 = uint32_t;
        struct MD5_CTX {
            UINT4         i[2];       /* number of _bits_ handled mod 2^64 */
            UINT4         buf[4];     /* scratch buffer */
            unsigned char in[64];     /* input buffer */
            unsigned char digest[16]; /* actual digest after MD5Final call */
        };
        MD5_CTX fCtx_{};
#if qStroika_Foundation_Debug_AssertionsChecked
        bool fCompleted_{false};
#endif
 
    private:
        // public: //tmphack til we get rid of other class
        static void MD5Init_ (MD5_CTX* mdContext);
 
        static void MD5Update_ (MD5_CTX* mdContext, const unsigned char* inBuf, unsigned int inLen);
        static void MD5Final_ (MD5_CTX* mdContext);
        static void Transform (UINT4* buf, UINT4* in);
    };
 
}
 
/*
 ********************************************************************************
 ***************************** Implementation Details ***************************
 ********************************************************************************
 */
#include "MD5.inl"
 
#endif /*_Stroika_Foundation_Cryptography_Digest_MD5_h_*/