| /* |
| * Copyright (c) 2003, 2008, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.security.rsa; |
| |
| import java.io.IOException; |
| import java.math.BigInteger; |
| |
| import java.security.*; |
| import java.security.interfaces.*; |
| |
| import sun.security.util.*; |
| import sun.security.x509.X509Key; |
| |
| /** |
| * Key implementation for RSA public keys. |
| * |
| * Note: RSA keys must be at least 512 bits long |
| * |
| * @see RSAPrivateCrtKeyImpl |
| * @see RSAKeyFactory |
| * |
| * @since 1.5 |
| * @author Andreas Sterbenz |
| */ |
| public final class RSAPublicKeyImpl extends X509Key implements RSAPublicKey { |
| |
| private static final long serialVersionUID = 2644735423591199609L; |
| |
| private BigInteger n; // modulus |
| private BigInteger e; // public exponent |
| |
| /** |
| * Construct a key from its components. Used by the |
| * RSAKeyFactory and the RSAKeyPairGenerator. |
| */ |
| public RSAPublicKeyImpl(BigInteger n, BigInteger e) |
| throws InvalidKeyException { |
| this.n = n; |
| this.e = e; |
| RSAKeyFactory.checkRSAProviderKeyLengths(n.bitLength(), e); |
| // generate the encoding |
| algid = RSAPrivateCrtKeyImpl.rsaId; |
| try { |
| DerOutputStream out = new DerOutputStream(); |
| out.putInteger(n); |
| out.putInteger(e); |
| DerValue val = |
| new DerValue(DerValue.tag_Sequence, out.toByteArray()); |
| key = val.toByteArray(); |
| } catch (IOException exc) { |
| // should never occur |
| throw new InvalidKeyException(exc); |
| } |
| } |
| |
| /** |
| * Construct a key from its encoding. Used by RSAKeyFactory. |
| */ |
| public RSAPublicKeyImpl(byte[] encoded) throws InvalidKeyException { |
| decode(encoded); |
| RSAKeyFactory.checkRSAProviderKeyLengths(n.bitLength(), e); |
| } |
| |
| // see JCA doc |
| public String getAlgorithm() { |
| return "RSA"; |
| } |
| |
| // see JCA doc |
| public BigInteger getModulus() { |
| return n; |
| } |
| |
| // see JCA doc |
| public BigInteger getPublicExponent() { |
| return e; |
| } |
| |
| /** |
| * Parse the key. Called by X509Key. |
| */ |
| protected void parseKeyBits() throws InvalidKeyException { |
| try { |
| DerInputStream in = new DerInputStream(key); |
| DerValue derValue = in.getDerValue(); |
| if (derValue.tag != DerValue.tag_Sequence) { |
| throw new IOException("Not a SEQUENCE"); |
| } |
| DerInputStream data = derValue.data; |
| n = RSAPrivateCrtKeyImpl.getBigInteger(data); |
| e = RSAPrivateCrtKeyImpl.getBigInteger(data); |
| if (derValue.data.available() != 0) { |
| throw new IOException("Extra data available"); |
| } |
| } catch (IOException e) { |
| throw new InvalidKeyException("Invalid RSA public key", e); |
| } |
| } |
| |
| // return a string representation of this key for debugging |
| public String toString() { |
| return "Sun RSA public key, " + n.bitLength() + " bits\n modulus: " |
| + n + "\n public exponent: " + e; |
| } |
| |
| protected Object writeReplace() throws java.io.ObjectStreamException { |
| return new KeyRep(KeyRep.Type.PUBLIC, |
| getAlgorithm(), |
| getFormat(), |
| getEncoded()); |
| } |
| } |