UT_RSA.h

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// RSA public key encryption

#ifndef __UT_RSA__
#define __UT_RSA__

#include "UT_API.h"
#include "UT_VeryLong.h"

class UT_API UT_RSA_Public
{
public:
    UT_VeryLong myM;            // My modulus
    UT_VeryLong myE;            // My public exponent

    // Requires 0 <= plain < m
    UT_VeryLong encrypt( const UT_VeryLong &plain );
    void        encrypt(unsigned char *dest, const unsigned char *src,
                        unsigned &len);

    void        setE(const unsigned *e, int ewords);
    void        setM(const unsigned *m, int mwords);
    void        setE(UT_VeryLong &e)    { myE = e; }
    void        setM(UT_VeryLong &m)    { myM = m; }
};

class UT_API UT_RSA_Private : public UT_RSA_Public
{
public:
    UT_VeryLong myD;            // My private key
    UT_VeryLong decrypt(const UT_VeryLong &cipher);
    void        decrypt(unsigned char *dest, const unsigned char *src,
                        unsigned &len);

    void        setPassword(const char *passwd);
    // r1 and r2 should be null terminated random strings
    // each of length around 35 characters (for a 500 bit modulus)
    void        create(const char *r1, const char *r2, const char *passwd);
    void        setD(const unsigned *d, int dwords);
    void        setD(UT_VeryLong &d)    { myD = d; }

    // Print code containing modulus and public/private keys
    void        printCode();
};

#endif