diff options
Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/java/security/key/dss/DSSPrivateKey.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/java/security/key/dss/DSSPrivateKey.java | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/security/key/dss/DSSPrivateKey.java b/gcc-4.4.3/libjava/classpath/gnu/java/security/key/dss/DSSPrivateKey.java new file mode 100644 index 000000000..633fcf7ce --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/java/security/key/dss/DSSPrivateKey.java @@ -0,0 +1,205 @@ +/* DSSPrivateKey.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.dss; + +import gnu.java.lang.CPStringBuilder; + +import gnu.java.security.Configuration; +import gnu.java.security.Registry; +import gnu.java.security.action.GetPropertyAction; +import gnu.java.security.key.IKeyPairCodec; + +import java.math.BigInteger; +import java.security.AccessController; +import java.security.PrivateKey; +import java.security.interfaces.DSAPrivateKey; + +/** + * An object that embodies a DSS (Digital Signature Standard) private key. + * + * @see #getEncoded + */ +public class DSSPrivateKey + extends DSSKey + implements PrivateKey, DSAPrivateKey +{ + /** + * A randomly or pseudorandomly generated integer with <code>0 < x < + * q</code>. + */ + private final BigInteger x; + + /** String representation of this key. Cached for speed. */ + private transient String str; + + /** + * Convenience constructor. Calls the constructor with 5 arguments passing + * {@link Registry#RAW_ENCODING_ID} as the identifier of the preferred + * encoding format. + * + * @param p the public modulus. + * @param q the public prime divisor of <code>p-1</code>. + * @param g a generator of the unique cyclic group <code>Z<sup>*</sup> + * <sub>p</sub></code>. + * @param x the private key part. + */ + public DSSPrivateKey(BigInteger p, BigInteger q, BigInteger g, BigInteger x) + { + this(Registry.RAW_ENCODING_ID, p, q, g, x); + } + + /** + * Constructs a new instance of a <code>DSSPrivateKey</code> given the + * designated arguments. + * + * @param preferredFormat the indetifier of the preferred encoding format to + * use when externalizing this key. + * @param p the public modulus. + * @param q the public prime divisor of <code>p-1</code>. + * @param g a generator of the unique cyclic group <code>Z<sup>*</sup> + * <sub>p</sub></code>. + * @param x the private key part. + */ + public DSSPrivateKey(int preferredFormat, BigInteger p, BigInteger q, + BigInteger g, BigInteger x) + { + super(preferredFormat == Registry.ASN1_ENCODING_ID ? Registry.PKCS8_ENCODING_ID + : preferredFormat, + p, q, g); + this.x = x; + } + + /** + * A class method that takes the output of the <code>encodePrivateKey()</code> + * method of a DSS keypair codec object (an instance implementing + * {@link gnu.java.security.key.IKeyPairCodec} for DSS keys, and re-constructs + * an instance of this object. + * + * @param k the contents of a previously encoded instance of this object. + * @exception ArrayIndexOutOfBoundsException if there is not enough bytes, in + * <code>k</code>, to represent a valid encoding of an + * instance of this object. + * @exception IllegalArgumentException if the byte sequence does not represent + * a valid encoding of an instance of this object. + */ + public static DSSPrivateKey valueOf(byte[] k) + { + // try RAW codec + if (k[0] == Registry.MAGIC_RAW_DSS_PRIVATE_KEY[0]) + try + { + return (DSSPrivateKey) new DSSKeyPairRawCodec().decodePrivateKey(k); + } + catch (IllegalArgumentException ignored) + { + } + // try PKCS#8 codec + return (DSSPrivateKey) new DSSKeyPairPKCS8Codec().decodePrivateKey(k); + } + + public BigInteger getX() + { + return x; + } + + /** + * Returns the encoded form of this private key according to the designated + * format. + * + * @param format the desired format identifier of the resulting encoding. + * @return the byte sequence encoding this key according to the designated + * format. + * @exception IllegalArgumentException if the format is not supported. + * @see DSSKeyPairRawCodec + */ + public byte[] getEncoded(int format) + { + byte[] result; + switch (format) + { + case IKeyPairCodec.RAW_FORMAT: + result = new DSSKeyPairRawCodec().encodePrivateKey(this); + break; + case IKeyPairCodec.PKCS8_FORMAT: + result = new DSSKeyPairPKCS8Codec().encodePrivateKey(this); + break; + default: + throw new IllegalArgumentException("Unsupported encoding format: " + + format); + } + return result; + } + + /** + * Returns <code>true</code> if the designated object is an instance of + * {@link DSAPrivateKey} and has the same DSS (Digital Signature Standard) + * parameter values as this one. + * + * @param obj the other non-null DSS 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(Object obj) + { + if (obj == null) + return false; + + if (! (obj instanceof DSAPrivateKey)) + return false; + + DSAPrivateKey that = (DSAPrivateKey) obj; + return super.equals(that) && x.equals(that.getX()); + } + + public String toString() + { + if (str == null) + { + String ls = (String) AccessController.doPrivileged + (new GetPropertyAction("line.separator")); + str = new CPStringBuilder(this.getClass().getName()).append("(") + .append(super.toString()).append(",").append(ls) + .append("x=0x").append(Configuration.DEBUG ? x.toString(16) + : "**...*").append(ls) + .append(")") + .toString(); + } + return str; + } +} |