OSSUnwrap.java

/*
 * Copyright 2012-2013 Mathias Herberts
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package com.geoxp.oss.client;

import java.io.ByteArrayOutputStream;

import org.bouncycastle.util.encoders.Hex;

import com.geoxp.oss.CryptoHelper;
import com.geoxp.oss.OSS;
import com.geoxp.oss.OSSException;

public class OSSUnwrap {

  public static void main(String[] args) throws Exception {
    if (args.length < 2) {
      throw new OSSException("Usage: OSSUnwrap OSS_URL SECRET_NAME [SSH_SIGNING_KEY_FINGERPRINT]");
    }

    String sshkey = args.length > 2 ? ("".equals(args[2]) ? null : args[2]) : null;
    byte[] secret = OSSClient.getSecret(args[0], args[1], sshkey);

    //
    // Read data from stdin (hex digits)
    //

    ByteArrayOutputStream data = new ByteArrayOutputStream();

    byte[] buf = new byte[1024];

    do {
      int len = System.in.read(buf);

      if (len < 0) {
        break;
      }

      data.write(buf, 0, len);
    } while (true);

    data.close();

    //
    // Hex decode data read on stdin
    //

    byte[] decodedData = Hex.decode(data.toByteArray());

    //
    // Unwrap data with retrieved secret
    //

    byte[] unwrappedData = CryptoHelper.unwrapBlob(secret, decodedData);

    //
    // Output result
    //

    System.out.write(unwrappedData, 0, unwrappedData.length);

  }
}