CWE-ou-minkata/Sources/Plasma/NucleusLib/pnEncryption/plChecksum.h

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*==LICENSE==*/
#ifndef PL_CHECKSUM_H
#define PL_CHECKSUM_H

#include "HeadSpin.h"
#include <openssl/md5.h>
#include <openssl/sha.h>

class plChecksum
{
public:
    typedef uint32_t SumStorage;
private:
    SumStorage fSum;
public:
    plChecksum(unsigned int bufsize, const char* buffer);
    static int GetChecksumSize() { return sizeof(SumStorage); }
    static int GetWindowSize() { return sizeof(SumStorage); }
    SumStorage GetChecksum() { return fSum; }
};

class hsStream;
class plFileName;

class plMD5Checksum
{
    protected:
        bool    fValid;
        MD5_CTX fContext;
        uint8_t fChecksum[MD5_DIGEST_LENGTH];

    public:
        plMD5Checksum(size_t size, uint8_t* buffer);
        plMD5Checksum();
        plMD5Checksum(const plMD5Checksum& rhs);
        plMD5Checksum(const plFileName& fileName);
        plMD5Checksum(hsStream* stream);

        bool IsValid() const { return fValid; }
        void Clear();

        void CalcFromFile(const plFileName& fileName);
        void CalcFromStream(hsStream* stream);

        void Start();
        void AddTo(size_t size, const uint8_t* buffer);
        void Finish();

        const uint8_t* GetValue() const { return fChecksum; }
        size_t GetSize() const { return sizeof(fChecksum); }

        // Backdoor for cached checksums (ie, if you loaded it off disk)
        void SetValue(uint8_t* checksum);

        // Note: GetAsHexString() returns a pointer to a static string;
        // do not rely on the contents of this string between calls!
        const char* GetAsHexString() const;
        void SetFromHexString(const char* string);

        bool operator==(const plMD5Checksum& rhs) const;
        bool operator!=(const plMD5Checksum& rhs) const { return !operator==(rhs); }
};

/* A bunch of things might store either a SHA or a SHA1 checksum, this provides
 * them a way to store the checksum itself, rather than a union of the classes.
 */
typedef uint8_t ShaDigest[SHA_DIGEST_LENGTH];

class plSHAChecksum
{
    protected:
        bool      fValid;
        SHA_CTX   fContext;
        ShaDigest fChecksum;

    public:
        plSHAChecksum(size_t size, uint8_t* buffer);
        plSHAChecksum();
        plSHAChecksum(const plSHAChecksum& rhs);
        plSHAChecksum(const plFileName& fileName);
        plSHAChecksum(hsStream* stream);

        bool IsValid() const { return fValid; }
        void Clear();

        void CalcFromFile(const plFileName& fileName);
        void CalcFromStream(hsStream* stream);

        void Start();
        void AddTo(size_t size, const uint8_t* buffer);
        void Finish();

        const uint8_t* GetValue() const { return fChecksum; }
        size_t GetSize() const { return sizeof(fChecksum); }

        // Backdoor for cached checksums (ie, if you loaded it off disk)
        void SetValue(uint8_t* checksum);

        // Note: GetAsHexString() returns a pointer to a static string;
        // do not rely on the contents of this string between calls!
        const char* GetAsHexString() const;
        void SetFromHexString(const char* string);

        bool operator==(const plSHAChecksum& rhs) const;
        bool operator!=(const plSHAChecksum& rhs) const { return !operator==(rhs); }
};

class plSHA1Checksum
{
    protected:
        bool      fValid;
        SHA_CTX   fContext;
        ShaDigest fChecksum;

    public:
        plSHA1Checksum(size_t size, uint8_t* buffer);
        plSHA1Checksum();
        plSHA1Checksum(const plSHA1Checksum& rhs);
        plSHA1Checksum(const plFileName& fileName);
        plSHA1Checksum(hsStream* stream);

        bool IsValid() const { return fValid; }
        void Clear();

        void CalcFromFile(const plFileName& fileName);
        void CalcFromStream(hsStream* stream);

        void Start();
        void AddTo(size_t size, const uint8_t* buffer);
        void Finish();

        const uint8_t* GetValue() const { return fChecksum; }
        size_t GetSize() const { return sizeof(fChecksum); }

        // Backdoor for cached checksums (ie, if you loaded it off disk)
        void SetValue(uint8_t* checksum);

        // Note: GetAsHexString() returns a pointer to a static string;
        // do not rely on the contents of this string between calls!
        const char* GetAsHexString() const;
        void SetFromHexString(const char* string);

        bool operator==(const plSHA1Checksum& rhs) const;
        bool operator!=(const plSHA1Checksum& rhs) const { return !operator==(rhs); }
};

#endif // PL_CHECKSUM_H