src/ephemerizer/PolicyForEphemerizer.h

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/*
 * FADE - Secure Overlay Cloud Storage with File Assured Deletion
 * Copyright (C) 2010  Yang Tang
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef FADE_POLICY_FOR_EPHEMERIZER_H
#define FADE_POLICY_FOR_EPHEMERIZER_H

#include <openssl/rsa.h>
#include <unistd.h>
#include <string>

using namespace std;

class PolicyForEphemerizer
{
        string policyName;
        RSA *rsa;
        BN_CTX *ctx;
        void generateKey();
        void readPEM();
        void writePEM() const;
public:
        PolicyForEphemerizer(const string &policyName);

        ~PolicyForEphemerizer()
        {
                RSA_free(rsa);
                BN_CTX_free(ctx);
        }

        string getPolicyName() const
        {
                return policyName;
        }

        int getRSASize() const
        {
                return RSA_size(rsa);
        }

        BIGNUM *getN() const
        {
                return rsa->n;
        }

        BIGNUM *getE() const
        {
                return rsa->e;
        }

        int decrypt(int flen, const unsigned char *from, unsigned char *to) const;

        static bool exist(const string &policyName)
        {
                return (access(("keys/" + policyName + ".pem").c_str(), F_OK) == 0);
        }
};

#endif /* FADE_POLICY_FOR_EPHEMERIZER_H */

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