UT_SHA256.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * NAME:        UT_SHA256.h (UT Library, C++)
 *
 * COMMENTS:
 */

#ifndef __UT_SHA256_H__
#define __UT_SHA256_H__

#include "UT_API.h"

#include "UT_String.h"
#include "UT_WorkBuffer.h"

class UT_API UT_SHA256
{
public:
    UT_SHA256() { init(); }
    // Produce a SHA256 hash
    static void hash(const UT_WorkBuffer& input, UT_String& output);
    static UT_StringHolder   hash(const UT_StringView &input)
    {
        return hash({input});
    }
    static void hash(
            const std::initializer_list<UT_StringView>& inputs,
            UT_StringHolder& output);
    static UT_StringHolder   hash(
            const std::initializer_list<UT_StringView>& inputs);

protected:
    void init();
    void update(const unsigned char* message, unsigned int len);
    void finalize(unsigned char* digest);
    void transform(const unsigned char* message, unsigned int block_nb);

    static const unsigned int SHA256_BLOCK_SIZE = 64;
    static const unsigned int DIGEST_SIZE = 32;

    unsigned int myTotalLength;
    unsigned int myLength;
    unsigned char myBlock[SHA256_BLOCK_SIZE * 2];
    uint32 myH[8];
};

#endif // __UT_SHA256_H__