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package gnu.crypto.key.rsa;

// ----------------------------------------------------------------------------
// $Id: RSAKeyPairRawCodec.java,v 1.1 2003/09/26 23:50:48 raif Exp $
//
// Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
//
// This file is part of GNU Crypto.
//
// GNU Crypto 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, or (at your option)
// any later version.
//
// GNU Crypto 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; see the file COPYING.  If not, write to the
//
//    Free Software Foundation Inc.,
//    59 Temple Place - Suite 330,
//    Boston, MA 02111-1307
//    USA
//
// Linking this library statically or dynamically with other modules is
// making a combined work based on this library.  Thus, the terms and
// conditions of the GNU General Public License cover the whole
// combination.
//
// As a special exception, the copyright holders of this library give
// you permission to link this library with independent modules to
// produce an executable, regardless of the license terms of these
// independent modules, and to copy and distribute the resulting
// executable under terms of your choice, provided that you also meet,
// for each linked independent module, the terms and conditions of the
// license of that module.  An independent module is a module which is
// not derived from or based on this library.  If you modify this
// library, you may extend this exception to your version of the
// library, but you are not obligated to do so.  If you do not wish to
// do so, delete this exception statement from your version.
// ----------------------------------------------------------------------------

import gnu.crypto.Registry;
import gnu.crypto.key.IKeyPairCodec;

import java.io.ByteArrayOutputStream;
import java.math.BigInteger;
import java.security.PrivateKey;
import java.security.PublicKey;

/**
 * 

An object that implements the {@link IKeyPairCodec} interface for the * Raw format to use with RSA keypairs.

* * @version $Revision: 1.1 $ */ public class RSAKeyPairRawCodec implements IKeyPairCodec { // Constants and variables // ------------------------------------------------------------------------- // Constructor(s) // ------------------------------------------------------------------------- // implicit 0-arguments constructor // Class methods // ------------------------------------------------------------------------- // Instance methods // ------------------------------------------------------------------------- // gnu.crypto.key.IKeyPairCodec interface implementation ------------------- public int getFormatID() { return RAW_FORMAT; } /** *

Returns the encoded form of the designated RSA public key according to * the Raw format supported by this library.

* *

The Raw format for an RSA public key, in this implementation, is * a byte sequence consisting of the following:

* *
    *
  1. 4-byte magic consisting of the value of the literal * {@link Registry#MAGIC_RAW_RSA_PUBLIC_KEY},
  2. *
  3. 1-byte version consisting of the constant: 0x01,
  4. *
  5. 4-byte count of following bytes representing the RSA parameter * n (the modulus) in internet order,
  6. *
  7. n-bytes representation of a {@link BigInteger} obtained by invoking * the toByteArray() method on the RSA parameter n,
  8. *
  9. 4-byte count of following bytes representing the RSA parameter * e (the public exponent) in internet order,
  10. *
  11. n-bytes representation of a {@link BigInteger} obtained by invoking * the toByteArray() method on the RSA parameter e.
  12. *
* * @param key the key to encode. * @return the Raw format encoding of the designated key. * @exception IllegalArgumentException if the designated key is not an RSA * one. */ public byte[] encodePublicKey(PublicKey key) { if (!(key instanceof GnuRSAPublicKey)) { throw new IllegalArgumentException("key"); } GnuRSAPublicKey rsaKey = (GnuRSAPublicKey) key; ByteArrayOutputStream baos = new ByteArrayOutputStream(); // magic baos.write(Registry.MAGIC_RAW_RSA_PUBLIC_KEY[0]); baos.write(Registry.MAGIC_RAW_RSA_PUBLIC_KEY[1]); baos.write(Registry.MAGIC_RAW_RSA_PUBLIC_KEY[2]); baos.write(Registry.MAGIC_RAW_RSA_PUBLIC_KEY[3]); // version baos.write(0x01); // n byte[] buffer = rsaKey.getModulus().toByteArray(); int length = buffer.length; baos.write( length >>> 24 ); baos.write((length >>> 16) & 0xFF); baos.write((length >>> 8) & 0xFF); baos.write( length & 0xFF); baos.write(buffer, 0, length); // e buffer = rsaKey.getPublicExponent().toByteArray(); length = buffer.length; baos.write( length >>> 24 ); baos.write((length >>> 16) & 0xFF); baos.write((length >>> 8) & 0xFF); baos.write( length & 0xFF); baos.write(buffer, 0, length); return baos.toByteArray(); } public PublicKey decodePublicKey(byte[] k) { // magic if (k[0] != Registry.MAGIC_RAW_RSA_PUBLIC_KEY[0] || k[1] != Registry.MAGIC_RAW_RSA_PUBLIC_KEY[1] || k[2] != Registry.MAGIC_RAW_RSA_PUBLIC_KEY[2] || k[3] != Registry.MAGIC_RAW_RSA_PUBLIC_KEY[3]) { throw new IllegalArgumentException("magic"); } // version if (k[4] != 0x01) { throw new IllegalArgumentException("version"); } int i = 5; int l; byte[] buffer; // n l = k[i++] << 24 | (k[i++] & 0xFF) << 16 | (k[i++] & 0xFF) << 8 | (k[i++] & 0xFF); buffer = new byte[l]; System.arraycopy(k, i, buffer, 0, l); i += l; BigInteger n = new BigInteger(1, buffer); // e l = k[i++] << 24 | (k[i++] & 0xFF) << 16 | (k[i++] & 0xFF) << 8 | (k[i++] & 0xFF); buffer = new byte[l]; System.arraycopy(k, i, buffer, 0, l); i += l; BigInteger e = new BigInteger(1, buffer); return new GnuRSAPublicKey(n, e); } /** *

Returns the encoded form of the designated RSA private key according to * the Raw format supported by this library.

* *

The Raw format for an RSA private key, in this implementation, * is a byte sequence consisting of the following:

* *
    *
  1. 4-byte magic consisting of the value of the literal * {@link Registry#MAGIC_RAW_RSA_PRIVATE_KEY},
  2. *
  3. 1-byte version consisting of the constant: 0x01,
  4. *
  5. 4-byte count of following bytes representing the RSA parameter * p (the first prime factor of the modulus) in internet * order,
  6. *
  7. n-bytes representation of a {@link BigInteger} obtained by invoking * the toByteArray() method on the RSA parameter p,
  8. *
  9. 4-byte count of following bytes representing the RSA parameter * q (the second prime factor of the modulus) in internet * order,
  10. *
  11. n-bytes representation of a {@link BigInteger} obtained by invoking * the toByteArray() method on the RSA parameter q,
  12. *
  13. 4-byte count of following bytes representing the RSA parameter * e (the public exponent) in internet order,
  14. *
  15. n-bytes representation of a {@link BigInteger} obtained by invoking * the toByteArray() method on the RSA parameter e,
  16. *
  17. 4-byte count of following bytes representing the RSA parameter * d (the private exponent) in internet order,
  18. *
  19. n-bytes representation of a {@link BigInteger} obtained by invoking * the toByteArray() method on the RSA parameter d,
  20. *
* * @param key the key to encode. * @return the Raw format encoding of the designated key. */ public byte[] encodePrivateKey(PrivateKey key) { if (!(key instanceof GnuRSAPrivateKey)) { throw new IllegalArgumentException("key"); } GnuRSAPrivateKey rsaKey = (GnuRSAPrivateKey) key; ByteArrayOutputStream baos = new ByteArrayOutputStream(); // magic baos.write(Registry.MAGIC_RAW_RSA_PRIVATE_KEY[0]); baos.write(Registry.MAGIC_RAW_RSA_PRIVATE_KEY[1]); baos.write(Registry.MAGIC_RAW_RSA_PRIVATE_KEY[2]); baos.write(Registry.MAGIC_RAW_RSA_PRIVATE_KEY[3]); // version baos.write(0x01); // p byte[] buffer = rsaKey.getPrimeP().toByteArray(); int length = buffer.length; baos.write( length >>> 24 ); baos.write((length >>> 16) & 0xFF); baos.write((length >>> 8) & 0xFF); baos.write( length & 0xFF); baos.write(buffer, 0, length); // q buffer = rsaKey.getPrimeQ().toByteArray(); length = buffer.length; baos.write( length >>> 24 ); baos.write((length >>> 16) & 0xFF); baos.write((length >>> 8) & 0xFF); baos.write( length & 0xFF); baos.write(buffer, 0, length); // e buffer = rsaKey.getPublicExponent().toByteArray(); length = buffer.length; baos.write( length >>> 24 ); baos.write((length >>> 16) & 0xFF); baos.write((length >>> 8) & 0xFF); baos.write( length & 0xFF); baos.write(buffer, 0, length); // d buffer = rsaKey.getPrivateExponent().toByteArray(); length = buffer.length; baos.write( length >>> 24 ); baos.write((length >>> 16) & 0xFF); baos.write((length >>> 8) & 0xFF); baos.write( length & 0xFF); baos.write(buffer, 0, length); return baos.toByteArray(); } public PrivateKey decodePrivateKey(byte[] k) { // magic if (k[0] != Registry.MAGIC_RAW_RSA_PRIVATE_KEY[0] || k[1] != Registry.MAGIC_RAW_RSA_PRIVATE_KEY[1] || k[2] != Registry.MAGIC_RAW_RSA_PRIVATE_KEY[2] || k[3] != Registry.MAGIC_RAW_RSA_PRIVATE_KEY[3]) { throw new IllegalArgumentException("magic"); } // version if (k[4] != 0x01) { throw new IllegalArgumentException("version"); } int i = 5; int l; byte[] buffer; // p l = k[i++] << 24 | (k[i++] & 0xFF) << 16 | (k[i++] & 0xFF) << 8 | (k[i++] & 0xFF); buffer = new byte[l]; System.arraycopy(k, i, buffer, 0, l); i += l; BigInteger p = new BigInteger(1, buffer); // q l = k[i++] << 24 | (k[i++] & 0xFF) << 16 | (k[i++] & 0xFF) << 8 | (k[i++] & 0xFF); buffer = new byte[l]; System.arraycopy(k, i, buffer, 0, l); i += l; BigInteger q = new BigInteger(1, buffer); // e l = k[i++] << 24 | (k[i++] & 0xFF) << 16 | (k[i++] & 0xFF) << 8 | (k[i++] & 0xFF); buffer = new byte[l]; System.arraycopy(k, i, buffer, 0, l); i += l; BigInteger e = new BigInteger(1, buffer); // d l = k[i++] << 24 | (k[i++] & 0xFF) << 16 | (k[i++] & 0xFF) << 8 | (k[i++] & 0xFF); buffer = new byte[l]; System.arraycopy(k, i, buffer, 0, l); i += l; BigInteger d = new BigInteger(1, buffer); return new GnuRSAPrivateKey(p, q, e, d); } }




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