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Diffstat (limited to 'libjava/classpath/gnu/java/security/key/rsa/GnuRSAPublicKey.java')
| -rw-r--r-- | libjava/classpath/gnu/java/security/key/rsa/GnuRSAPublicKey.java | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/security/key/rsa/GnuRSAPublicKey.java b/libjava/classpath/gnu/java/security/key/rsa/GnuRSAPublicKey.java new file mode 100644 index 00000000000..f49027ca621 --- /dev/null +++ b/libjava/classpath/gnu/java/security/key/rsa/GnuRSAPublicKey.java @@ -0,0 +1,185 @@ +/* GnuRSAPublicKey.java -- + Copyright 2001, 2002, 2003, 2006 Free Software Foundation, Inc. + +This file is a part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or (at +your option) any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; if not, write to the Free Software +Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 +USA + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.java.security.key.rsa; + +import gnu.java.security.Registry; +import gnu.java.security.key.IKeyPairCodec; + +import java.math.BigInteger; +import java.security.PublicKey; +import java.security.interfaces.RSAPublicKey; + +/** + * <p>An object that encapsulates an RSA public key.</p> + * + * <p>References:</p> + * <ol> + * <li><a href="http://www.cosic.esat.kuleuven.ac.be/nessie/workshop/submissions/rsa-pss.zip"> + * RSA-PSS Signature Scheme with Appendix, part B.</a><br> + * Primitive specification and supporting documentation.<br> + * Jakob Jonsson and Burt Kaliski.</li> + * </ol> + * + * @version $Revision: 1.2 $ + */ +public class GnuRSAPublicKey extends GnuRSAKey implements PublicKey, + RSAPublicKey +{ + + // Constants and variables + // ------------------------------------------------------------------------- + + // Constructor(s) + // ------------------------------------------------------------------------- + + /** + * Conveience constructor. Calls the constructor with 3 arguments passing + * {@link Registry#RAW_ENCODING_ID} as the identifier of the preferred + * encoding format. + * + * @param n the modulus. + * @param e the public exponent. + */ + public GnuRSAPublicKey(final BigInteger n, final BigInteger e) + { + this(Registry.RAW_ENCODING_ID, n, e); + } + + /** + * Constructs a new instance of <code>GnuRSAPublicKey</code> given the + * designated arguments. + * + * @param preferredFormat the identifier of the preferred encoding format to + * use when externalizing this key. + * @param n the modulus. + * @param e the public exponent. + */ + public GnuRSAPublicKey(int preferredFormat, BigInteger n, BigInteger e) + { + super(preferredFormat == Registry.ASN1_ENCODING_ID ? Registry.X509_ENCODING_ID + : preferredFormat, + n, e); + } + + // Class methods + // ------------------------------------------------------------------------- + + /** + * A class method that takes the output of the <code>encodePublicKey()</code> + * method of an RSA keypair codec object (an instance implementing + * {@link IKeyPairCodec} for RSA keys, and re-constructs an instance of this + * object. + * + * @param k the contents of a previously encoded instance of this object. + * @throws ArrayIndexOutOfBoundsException if there is not enough bytes, in + * <code>k</code>, to represent a valid encoding of an instance + * of this object. + * @throws IllegalArgumentException if the byte sequence does not represent a + * valid encoding of an instance of this object. + */ + public static GnuRSAPublicKey valueOf(final byte[] k) + { + // try RAW codec + if (k[0] == Registry.MAGIC_RAW_RSA_PUBLIC_KEY[0]) + try + { + return (GnuRSAPublicKey) new RSAKeyPairRawCodec().decodePublicKey(k); + } + catch (IllegalArgumentException ignored) + { + } + + // try X.509 codec + return (GnuRSAPublicKey) new RSAKeyPairX509Codec().decodePublicKey(k); + } + + // Instance methods + // ------------------------------------------------------------------------- + + /** + * <p>Returns the encoded form of this public key according to the designated + * format.</p> + * + * @param format the desired format identifier of the resulting encoding. + * @return the byte sequence encoding this key according to the designated + * format. + * @throws IllegalArgumentException if the format is not supported. + * @see RSAKeyPairRawCodec + */ + public byte[] getEncoded(final int format) + { + final byte[] result; + switch (format) + { + case IKeyPairCodec.RAW_FORMAT: + result = new RSAKeyPairRawCodec().encodePublicKey(this); + break; + case IKeyPairCodec.X509_FORMAT: + result = new RSAKeyPairX509Codec().encodePublicKey(this); + break; + default: + throw new IllegalArgumentException("Unsupported encoding format: " + + format); + } + return result; + } + + /** + * <p>Returns <code>true</code> if the designated object is an instance of + * this class and has the same RSA parameter values as this one.</p> + * + * @param obj the other non-null RSA key to compare to. + * @return <code>true</code> if the designated object is of the same type and + * value as this one. + */ + public boolean equals(final Object obj) + { + if (obj == null) + { + return false; + } + if (!(obj instanceof RSAPublicKey)) + { + return false; + } + final RSAPublicKey that = (RSAPublicKey) obj; + return super.equals(that) + && getPublicExponent().equals(that.getPublicExponent()); + } +} |
