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blumgold.h

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#ifndef CRYPTOPP_BLUMGOLD_H
#define CRYPTOPP_BLUMGOLD_H

#include "cryptlib.h"
#include "integer.h"

NAMESPACE_BEGIN(CryptoPP)

class BlumGoldwasserPublicKey : public PK_Encryptor
{
public:
        // you can use the default copy constructor to make a BlumGoldwasserPublicKey
        // out of a BlumGoldwasserPrivateKey
        BlumGoldwasserPublicKey(const Integer &n);
        BlumGoldwasserPublicKey(BufferedTransformation &bt);

        void DEREncode(BufferedTransformation &bt) const;

        void Encrypt(RandomNumberGenerator &rng, const byte *plainText, unsigned int plainTextLength, byte *cipherText);

        unsigned int MaxPlainTextLength(unsigned int cipherTextLength) const;
        unsigned int CipherTextLength(unsigned int plainTextLength) const;

protected:
        BlumGoldwasserPublicKey() {}

        Integer n;           // these are only modified in constructors
        unsigned int modulusLen;
};

class BlumGoldwasserPrivateKey : public BlumGoldwasserPublicKey, public PK_Decryptor
{
public:
        BlumGoldwasserPrivateKey(const Integer &n, const Integer &p, const Integer &q, const Integer &u);
        // generate a random private key
        BlumGoldwasserPrivateKey(RandomNumberGenerator &rng, unsigned int keybits);
        BlumGoldwasserPrivateKey(BufferedTransformation &bt);

        void DEREncode(BufferedTransformation &bt) const;

        unsigned int Decrypt(const byte *cipherText, unsigned int cipherTextLength, byte *plainText);

protected:
        Integer p, q, u;
};

NAMESPACE_END

#endif

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