J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.security.rsa; |
| 27 | |
| 28 | import java.io.IOException; |
| 29 | import java.math.BigInteger; |
| 30 | |
| 31 | import java.security.*; |
| 32 | import java.security.interfaces.*; |
| 33 | |
| 34 | import sun.security.util.*; |
| 35 | import sun.security.pkcs.PKCS8Key; |
| 36 | |
| 37 | /** |
| 38 | * Key implementation for RSA private keys, non-CRT form (modulus, private |
| 39 | * exponent only). For CRT private keys, see RSAPrivateCrtKeyImpl. We need |
| 40 | * separate classes to ensure correct behavior in instanceof checks, etc. |
| 41 | * |
| 42 | * Note: RSA keys must be at least 512 bits long |
| 43 | * |
| 44 | * @see RSAPrivateCrtKeyImpl |
| 45 | * @see RSAKeyFactory |
| 46 | * |
| 47 | * @since 1.5 |
| 48 | * @author Andreas Sterbenz |
| 49 | */ |
| 50 | public final class RSAPrivateKeyImpl extends PKCS8Key implements RSAPrivateKey { |
| 51 | |
| 52 | private static final long serialVersionUID = -33106691987952810L; |
| 53 | |
| 54 | private final BigInteger n; // modulus |
| 55 | private final BigInteger d; // private exponent |
| 56 | |
| 57 | /** |
| 58 | * Construct a key from its components. Used by the |
| 59 | * RSAKeyFactory and the RSAKeyPairGenerator. |
| 60 | */ |
| 61 | RSAPrivateKeyImpl(BigInteger n, BigInteger d) throws InvalidKeyException { |
| 62 | this.n = n; |
| 63 | this.d = d; |
| 64 | RSAKeyFactory.checkKeyLength(n); |
| 65 | // generate the encoding |
| 66 | algid = RSAPrivateCrtKeyImpl.rsaId; |
| 67 | try { |
| 68 | DerOutputStream out = new DerOutputStream(); |
| 69 | out.putInteger(0); // version must be 0 |
| 70 | out.putInteger(n); |
| 71 | out.putInteger(0); |
| 72 | out.putInteger(d); |
| 73 | out.putInteger(0); |
| 74 | out.putInteger(0); |
| 75 | out.putInteger(0); |
| 76 | out.putInteger(0); |
| 77 | out.putInteger(0); |
| 78 | DerValue val = |
| 79 | new DerValue(DerValue.tag_Sequence, out.toByteArray()); |
| 80 | key = val.toByteArray(); |
| 81 | } catch (IOException exc) { |
| 82 | // should never occur |
| 83 | throw new InvalidKeyException(exc); |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | // see JCA doc |
| 88 | public String getAlgorithm() { |
| 89 | return "RSA"; |
| 90 | } |
| 91 | |
| 92 | // see JCA doc |
| 93 | public BigInteger getModulus() { |
| 94 | return n; |
| 95 | } |
| 96 | |
| 97 | // see JCA doc |
| 98 | public BigInteger getPrivateExponent() { |
| 99 | return d; |
| 100 | } |
| 101 | |
| 102 | // return a string representation of this key for debugging |
| 103 | public String toString() { |
| 104 | return "Sun RSA private key, " + n.bitLength() + " bits\n modulus: " |
| 105 | + n + "\n private exponent: " + d; |
| 106 | } |
| 107 | |
| 108 | } |