libjava/classpath/gnu/java/security/provider/GnuRSAPrivateKey.java

   1 /* GnuRSAPrivateKey.java -- GNU RSA private key.
   2    Copyright (C) 2004  Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package gnu.java.security.provider;
  40
  41 import gnu.java.security.OID;
  42 import gnu.java.security.der.DER;
  43 import gnu.java.security.der.DERValue;
  44
  45 import java.math.BigInteger;
  46 import java.security.interfaces.RSAPrivateCrtKey;
  47 import java.security.spec.RSAPrivateCrtKeySpec;
  48 import java.util.ArrayList;
  49
  50 class GnuRSAPrivateKey implements RSAPrivateCrtKey
  51 {
  52
  53   // Fields.
  54   // -------------------------------------------------------------------------
  55
  56   private final RSAPrivateCrtKeySpec spec;
  57   private byte[] encodedKey;
  58
  59   // Constructor.
  60   // -------------------------------------------------------------------------
  61
  62   public GnuRSAPrivateKey(RSAPrivateCrtKeySpec spec)
  63   {
  64     this.spec = spec;
  65   }
  66
  67   // Instance methods.
  68   // -------------------------------------------------------------------------
  69
  70   public BigInteger getModulus()
  71   {
  72     return spec.getModulus();
  73   }
  74
  75   public BigInteger getPrivateExponent()
  76   {
  77     return spec.getPrivateExponent();
  78   }
  79
  80   public BigInteger getCrtCoefficient()
  81   {
  82     return spec.getCrtCoefficient();
  83   }
  84
  85   public BigInteger getPrimeExponentP()
  86   {
  87     return spec.getPrimeExponentP();
  88   }
  89
  90   public BigInteger getPrimeExponentQ()
  91   {
  92     return spec.getPrimeExponentQ();
  93   }
  94
  95   public BigInteger getPrimeP()
  96   {
  97     return spec.getPrimeP();
  98   }
  99
 100   public BigInteger getPrimeQ()
 101   {
 102     return spec.getPrimeQ();
 103   }
 104
 105   public BigInteger getPublicExponent()
 106   {
 107     return spec.getPublicExponent();
 108   }
 109
 110   public String getAlgorithm()
 111   {
 112     return "RSA";
 113   }
 114
 115   public String getFormat()
 116   {
 117     return "PKCS#8";
 118   }
 119
 120   /**
 121    * The encoded form is:
 122    *
 123    * <pre>
 124    * RSAPrivateKey ::= SEQUENCE {
 125    *   version Version,
 126    *   modulus INTEGER, -- n
 127    *   publicExponent INTEGER, -- e
 128    *   privateExponent INTEGER, -- d
 129    *   prime1 INTEGER, -- p
 130    *   prime2 INTEGER, -- q
 131    *   exponent1 INTEGER, -- d mod (p-1)
 132    *   exponent2 INTEGER, -- d mod (q-1)
 133    *   coefficient INTEGER -- (inverse of q) mod p }
 134    * </pre>
 135    *
 136    * <p>Which is in turn encoded in a PrivateKeyInfo structure from PKCS#8.
 137    */
 138   public byte[] getEncoded()
 139   {
 140     if (encodedKey != null)
 141       return (byte[]) encodedKey.clone();
 142     ArrayList key = new ArrayList(9);
 143     key.add(new DERValue(DER.INTEGER, BigInteger.ZERO));
 144     key.add(new DERValue(DER.INTEGER, getModulus()));
 145     key.add(new DERValue(DER.INTEGER, getPublicExponent()));
 146     key.add(new DERValue(DER.INTEGER, getPrivateExponent()));
 147     key.add(new DERValue(DER.INTEGER, getPrimeP()));
 148     key.add(new DERValue(DER.INTEGER, getPrimeQ()));
 149     key.add(new DERValue(DER.INTEGER, getPrimeExponentP()));
 150     key.add(new DERValue(DER.INTEGER, getPrimeExponentQ()));
 151     key.add(new DERValue(DER.INTEGER, getCrtCoefficient()));
 152     DERValue pk = new DERValue(DER.SEQUENCE|DER.CONSTRUCTED, key);
 153     ArrayList pki = new ArrayList(3);
 154     pki.add(new DERValue(DER.INTEGER, BigInteger.ZERO));
 155     ArrayList alg = new ArrayList(2);
 156     alg.add(new DERValue(DER.OBJECT_IDENTIFIER,
 157                          new OID("1.2.840.113549.1.1.1")));
 158     alg.add(new DERValue(DER.NULL, null));
 159     pki.add(new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, alg));
 160     pki.add(new DERValue(DER.OCTET_STRING, pk.getEncoded()));
 161     encodedKey = new DERValue(DER.SEQUENCE|DER.CONSTRUCTED, pki).getEncoded();
 162     return (byte[]) encodedKey.clone();
 163   }
 164 }