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| 1 | +/* | |
| 2 | + * Copyright (c) 2003, 2008, Oracle and/or its affiliates. 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. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * 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) | |
| 60 | + throws InvalidKeyException { | |
| 61 | + this.n = n; | |
| 62 | + this.e = e; | |
| 63 | + RSAKeyFactory.checkRSAProviderKeyLengths(n.bitLength(), e); | |
| 64 | + // generate the encoding | |
| 65 | + algid = RSAPrivateCrtKeyImpl.rsaId; | |
| 66 | + try { | |
| 67 | + DerOutputStream out = new DerOutputStream(); | |
| 68 | + out.putInteger(n); | |
| 69 | + out.putInteger(e); | |
| 70 | + DerValue val = | |
| 71 | + new DerValue(DerValue.tag_Sequence, out.toByteArray()); | |
| 72 | + key = val.toByteArray(); | |
| 73 | + } catch (IOException exc) { | |
| 74 | + // should never occur | |
| 75 | + throw new InvalidKeyException(exc); | |
| 76 | + } | |
| 77 | + } | |
| 78 | + | |
| 79 | + /** | |
| 80 | + * Construct a key from its encoding. Used by RSAKeyFactory. | |
| 81 | + */ | |
| 82 | + public RSAPublicKeyImpl(byte[] encoded) throws InvalidKeyException { | |
| 83 | + decode(encoded); | |
| 84 | + RSAKeyFactory.checkRSAProviderKeyLengths(n.bitLength(), e); | |
| 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 getPublicExponent() { | |
| 99 | + return e; | |
| 100 | + } | |
| 101 | + | |
| 102 | + /** | |
| 103 | + * Parse the key. Called by X509Key. | |
| 104 | + */ | |
| 105 | + protected void parseKeyBits() throws InvalidKeyException { | |
| 106 | + try { | |
| 107 | + DerInputStream in = new DerInputStream(key); | |
| 108 | + DerValue derValue = in.getDerValue(); | |
| 109 | + if (derValue.tag != DerValue.tag_Sequence) { | |
| 110 | + throw new IOException("Not a SEQUENCE"); | |
| 111 | + } | |
| 112 | + DerInputStream data = derValue.data; | |
| 113 | + n = RSAPrivateCrtKeyImpl.getBigInteger(data); | |
| 114 | + e = RSAPrivateCrtKeyImpl.getBigInteger(data); | |
| 115 | + if (derValue.data.available() != 0) { | |
| 116 | + throw new IOException("Extra data available"); | |
| 117 | + } | |
| 118 | + } catch (IOException e) { | |
| 119 | + throw new InvalidKeyException("Invalid RSA public key", e); | |
| 120 | + } | |
| 121 | + } | |
| 122 | + | |
| 123 | + // return a string representation of this key for debugging | |
| 124 | + public String toString() { | |
| 125 | + return "Sun RSA public key, " + n.bitLength() + " bits\n modulus: " | |
| 126 | + + n + "\n public exponent: " + e; | |
| 127 | + } | |
| 128 | + | |
| 129 | + protected Object writeReplace() throws java.io.ObjectStreamException { | |
| 130 | + return new KeyRep(KeyRep.Type.PUBLIC, | |
| 131 | + getAlgorithm(), | |
| 132 | + getFormat(), | |
| 133 | + getEncoded()); | |
| 134 | + } | |
| 135 | +} | |