J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2005 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.x509.X509Key; |
| 36 | |
| 37 | /** |
| 38 | * Key implementation for RSA public keys. |
| 39 | * |
| 40 | * Note: RSA keys must be at least 512 bits long |
| 41 | * |
| 42 | * @see RSAPrivateCrtKeyImpl |
| 43 | * @see RSAKeyFactory |
| 44 | * |
| 45 | * @since 1.5 |
| 46 | * @author Andreas Sterbenz |
| 47 | */ |
| 48 | public final class RSAPublicKeyImpl extends X509Key implements RSAPublicKey { |
| 49 | |
| 50 | private static final long serialVersionUID = 2644735423591199609L; |
| 51 | |
| 52 | private BigInteger n; // modulus |
| 53 | private BigInteger e; // public exponent |
| 54 | |
| 55 | /** |
| 56 | * Construct a key from its components. Used by the |
| 57 | * RSAKeyFactory and the RSAKeyPairGenerator. |
| 58 | */ |
| 59 | public RSAPublicKeyImpl(BigInteger n, BigInteger e) throws InvalidKeyException { |
| 60 | this.n = n; |
| 61 | this.e = e; |
| 62 | RSAKeyFactory.checkKeyLength(n); |
| 63 | // generate the encoding |
| 64 | algid = RSAPrivateCrtKeyImpl.rsaId; |
| 65 | try { |
| 66 | DerOutputStream out = new DerOutputStream(); |
| 67 | out.putInteger(n); |
| 68 | out.putInteger(e); |
| 69 | DerValue val = |
| 70 | new DerValue(DerValue.tag_Sequence, out.toByteArray()); |
| 71 | key = val.toByteArray(); |
| 72 | } catch (IOException exc) { |
| 73 | // should never occur |
| 74 | throw new InvalidKeyException(exc); |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * Construct a key from its encoding. Used by RSAKeyFactory. |
| 80 | */ |
| 81 | public RSAPublicKeyImpl(byte[] encoded) throws InvalidKeyException { |
| 82 | decode(encoded); |
| 83 | RSAKeyFactory.checkKeyLength(n); |
| 84 | } |
| 85 | |
| 86 | // see JCA doc |
| 87 | public String getAlgorithm() { |
| 88 | return "RSA"; |
| 89 | } |
| 90 | |
| 91 | // see JCA doc |
| 92 | public BigInteger getModulus() { |
| 93 | return n; |
| 94 | } |
| 95 | |
| 96 | // see JCA doc |
| 97 | public BigInteger getPublicExponent() { |
| 98 | return e; |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * Parse the key. Called by X509Key. |
| 103 | */ |
| 104 | protected void parseKeyBits() throws InvalidKeyException { |
| 105 | try { |
| 106 | DerInputStream in = new DerInputStream(key); |
| 107 | DerValue derValue = in.getDerValue(); |
| 108 | if (derValue.tag != DerValue.tag_Sequence) { |
| 109 | throw new IOException("Not a SEQUENCE"); |
| 110 | } |
| 111 | DerInputStream data = derValue.data; |
| 112 | n = RSAPrivateCrtKeyImpl.getBigInteger(data); |
| 113 | e = RSAPrivateCrtKeyImpl.getBigInteger(data); |
| 114 | if (derValue.data.available() != 0) { |
| 115 | throw new IOException("Extra data available"); |
| 116 | } |
| 117 | } catch (IOException e) { |
| 118 | throw new InvalidKeyException("Invalid RSA public key", e); |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | // return a string representation of this key for debugging |
| 123 | public String toString() { |
| 124 | return "Sun RSA public key, " + n.bitLength() + " bits\n modulus: " |
| 125 | + n + "\n public exponent: " + e; |
| 126 | } |
| 127 | |
| 128 | protected Object writeReplace() throws java.io.ObjectStreamException { |
| 129 | return new KeyRep(KeyRep.Type.PUBLIC, |
| 130 | getAlgorithm(), |
| 131 | getFormat(), |
| 132 | getEncoded()); |
| 133 | } |
| 134 | } |