org.tdmx.client.crypto.certificate.PrivateKeyIOUtils.java Source code

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Here is the source code for org.tdmx.client.crypto.certificate.PrivateKeyIOUtils.java

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/*
 * TDMX - Trusted Domain Messaging eXchange
 * 
 * Enterprise B2B messaging between separate corporations via interoperable cloud service providers.
 * 
 * Copyright (C) 2014 Peter Klauser (http://tdmx.org)
 * 
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
 * Public License as published by the Free Software Foundation, either version 3 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 Affero General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Affero General Public License along with this program. If not, see
 * http://www.gnu.org/licenses/.
 */
package org.tdmx.client.crypto.certificate;

import java.io.IOException;
import java.io.StringReader;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.EncodedKeySpec;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.openssl.PEMKeyPair;
import org.bouncycastle.openssl.PEMParser;

public class PrivateKeyIOUtils {

    // -------------------------------------------------------------------------
    // PUBLIC CONSTANTS
    // -------------------------------------------------------------------------
    public static final String ALGORITHM = "RSA";

    // -------------------------------------------------------------------------
    // PROTECTED AND PRIVATE VARIABLES AND CONSTANTS
    // -------------------------------------------------------------------------

    // -------------------------------------------------------------------------
    // CONSTRUCTORS
    // -------------------------------------------------------------------------

    // -------------------------------------------------------------------------
    // PUBLIC METHODS
    // -------------------------------------------------------------------------

    public static KeyPair pemToRSAPrivateKeyPair(String input) throws CryptoCertificateException {
        StringReader sr = new StringReader(input);
        PEMParser pp = new PEMParser(sr);

        Object o = null;
        try {
            while ((o = pp.readObject()) != null) {
                if (o instanceof PEMKeyPair) {
                    PEMKeyPair ch = (PEMKeyPair) o;

                    byte[] pkbytes = ch.getPublicKeyInfo().getEncoded(ASN1Encoding.DER);
                    KeyFactory kf = KeyFactory.getInstance(ALGORITHM);
                    EncodedKeySpec eks = new X509EncodedKeySpec(pkbytes);
                    PublicKey publicKey = kf.generatePublic(eks);

                    byte[] privbytes = ch.getPrivateKeyInfo().getEncoded(ASN1Encoding.DER);
                    EncodedKeySpec epks = new PKCS8EncodedKeySpec(privbytes);
                    PrivateKey privateKey = kf.generatePrivate(epks);

                    KeyPair kp = new KeyPair(publicKey, privateKey);
                    return kp;
                }
            }
        } catch (IOException e) {
            throw new CryptoCertificateException(CertificateResultCode.ERROR_IO, e);
        } catch (NoSuchAlgorithmException e) {
            throw new CryptoCertificateException(CertificateResultCode.ERROR_MISSING_ALGORITHM, e);
        } catch (InvalidKeySpecException e) {
            throw new CryptoCertificateException(CertificateResultCode.ERROR_INVALID_KEY_SPEC, e);
        } finally {
            try {
                pp.close();
            } catch (IOException e) {
            }
        }
        return null;
    }

    // -------------------------------------------------------------------------
    // PROTECTED METHODS
    // -------------------------------------------------------------------------

    // -------------------------------------------------------------------------
    // PRIVATE METHODS
    // -------------------------------------------------------------------------

    private PrivateKeyIOUtils() {
    }

    // -------------------------------------------------------------------------
    // PUBLIC ACCESSORS (GETTERS / SETTERS)
    // -------------------------------------------------------------------------

}