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Java library for generating CDOC 1.0/1.1/2.0 files with AES-256 GCM and RSA or ECC recipients
There is a newer version: 0.0.5
/**
 * Copyright (c) 2017 Martin Paljak
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 

 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.esteid.cdoc;

import javax.naming.NamingException;
import java.io.*;
import java.nio.file.Path;
import java.security.GeneralSecurityException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.List;

public class CDOC {
    final static SecureRandom random;

    static {
        try {
            // See DMI_RANDOM_USED_ONLY_ONCE for reasoning
            random = SecureRandom.getInstanceStrong();
            random.nextBytes(new byte[2]); // seed and discard first 16 bits
        } catch (NoSuchAlgorithmException e) {
            throw new Error("Need to have SecureRandom for encryption!");
        }
    }

    public static void encrypt(File to, List files, List recipients) throws GeneralSecurityException, NamingException, IOException {
        // TODO: Any logic here, depending on recipients?
        CDOCv1.encrypt(CDOCv1.VERSION.V1_1, to, files, recipients);
    }

    public static void encrypt(Path to, List paths, List recipients) throws GeneralSecurityException, NamingException, IOException {
        List fl = new ArrayList<>();
        for (Path p: paths)
            fl.add(p.toFile());
        encrypt( to.toFile(), fl, recipients);
    }

    public static String getVersion() {
        String version = "unknown-development";
        try (InputStream versionfile = CDOC.class.getResourceAsStream("pro_version.txt")) {
            if (versionfile != null) {
                try (BufferedReader vinfo = new BufferedReader(new InputStreamReader(versionfile, "UTF-8"))) {
                    version = vinfo.readLine();
                }
            }
        } catch (IOException e) {
            version = "unknown-error";
        }
        return version;
    }
}