org.casbah.provider.KeyHelper.java Source code

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Here is the source code for org.casbah.provider.KeyHelper.java

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/*******************************************************************************
 * Copyright (C) 2010 Marco Sandrini
 * 
 * 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.casbah.provider;

import java.io.File;
import java.io.IOException;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.interfaces.RSAPrivateCrtKey;
import java.security.spec.PKCS8EncodedKeySpec;

import javax.crypto.EncryptedPrivateKeyInfo;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;

import org.apache.commons.io.FileUtils;
import org.casbah.common.PemEncoder;

public class KeyHelper {

    private final static String KEY_ARMOR_NAME = "ENCRYPTED PRIVATE KEY";

    public static PrivateKey readKeyFromPkcs8File(String keypass, File keyFile) throws CAProviderException {
        try {
            String pemData = FileUtils.readFileToString(keyFile);
            return readKey(keypass, PemEncoder.decodeFromPem(pemData));
        } catch (IOException ioe) {
            throw new CAProviderException("An error occurred while reading key file", ioe);
        }
    }

    public static PrivateKey readKey(String keypass, byte[] keyData) throws CAProviderException {
        try {
            EncryptedPrivateKeyInfo pkInfo = new EncryptedPrivateKeyInfo(keyData);
            PBEKeySpec keySpec = new PBEKeySpec(keypass.toCharArray());
            SecretKeyFactory pbeKeyFactory = SecretKeyFactory.getInstance(pkInfo.getAlgName());
            PKCS8EncodedKeySpec encodedKeySpec = pkInfo.getKeySpec(pbeKeyFactory.generateSecret(keySpec));
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            return (RSAPrivateCrtKey) keyFactory.generatePrivate(encodedKeySpec);
        } catch (Exception e) {
            throw new CAProviderException("Could not decode private key", e);
        }

    }

    public static String encodeKeyToSSLeay(char[] keypass, PrivateKey key) {
        return null;
    }

    public static byte[] encodeKey(char[] keypass, PrivateKey key, boolean encodeToPem) {
        byte[] result = encodeKeyToDer(keypass, key);
        if (encodeToPem) {
            result = PemEncoder.encodeToPem(result, KEY_ARMOR_NAME).getBytes();
        }
        return result;
    }

    private static byte[] encodeKeyToDer(char[] keypass, PrivateKey key) {
        return key.getEncoded();
    }

}