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Diffstat (limited to 'libjava/classpath/javax/crypto/spec/RC5ParameterSpec.java')
| -rw-r--r-- | libjava/classpath/javax/crypto/spec/RC5ParameterSpec.java | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/libjava/classpath/javax/crypto/spec/RC5ParameterSpec.java b/libjava/classpath/javax/crypto/spec/RC5ParameterSpec.java new file mode 100644 index 000000000..8570c86b3 --- /dev/null +++ b/libjava/classpath/javax/crypto/spec/RC5ParameterSpec.java @@ -0,0 +1,202 @@ +/* RC5ParameterSpec.java -- parameters for RC5. + Copyright (C) 2004 Free Software Foundation, Inc. + +This file is 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, 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; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, 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 javax.crypto.spec; + +import java.security.spec.AlgorithmParameterSpec; + +/** + * A wrapper for parameters to the <a + * href="http://www.rsasecurity.com/rsalabs/faq/3-6-4.html">RC5</a> + * block cipher. + * + * @author Casey Marshall (csm@gnu.org) + * @since 1.4 + */ +public class RC5ParameterSpec implements AlgorithmParameterSpec +{ + + // Fields. + // ------------------------------------------------------------------------ + + /** The IV. */ + private byte[] iv; + + /** The number of rounds. */ + private int rounds; + + /** The version number. */ + private int version; + + /** The word size, in bits. */ + private int wordSize; + + // Constructors. + // ------------------------------------------------------------------------ + + /** + * Create RC5 parameters without an IV. + * + * @param version The version number. + * @param rounds The number of rounds. + * @param wordSize The size of a word, in bits. + */ + public RC5ParameterSpec(int version, int rounds, int wordSize) + { + this.version = version; + this.rounds = rounds; + this.wordSize = wordSize; + } + + /** + * Create RC5 parameters with an IV. The bytes in <code>iv</code> in + * the range <code>[0, 2*(wordSize/8)-1]</code> are used. + * + * @param version The version number. + * @param rounds The number of rounds. + * @param wordSize The size of a word, in bits. + * @param iv The IV data. + */ + public RC5ParameterSpec(int version, int rounds, int wordSize, byte[] iv) + { + this(version, rounds, wordSize, iv, 0); + } + + /** + * Create RC5 parameters with an IV. The bytes in <code>iv</code> in + * the range <code>[off, off+2*(wordSize/8)-1]</code> are used. + * + * @param version The version number. + * @param rounds The number of rounds. + * @param wordSize The size of a word, in bits. + * @param iv The IV data. + * @param off From where in the array the IV starts. + */ + public + RC5ParameterSpec(int version, int rounds, int wordSize, byte[] iv, int off) + { + this(version, rounds, wordSize); + int ivLength = 2 * (wordSize / 8); + if (off < 0) + throw new IllegalArgumentException(); + if (iv.length - off < ivLength) + { + throw new IllegalArgumentException("IV too short"); + } + this.iv = new byte[ivLength]; + System.arraycopy(iv, off, this.iv, 0, ivLength); + } + + // Instance methods. + // ------------------------------------------------------------------------ + + /** + * Return the initializaiton vector, or <code>null</code> if none was + * specified. + * + * @return The IV, or null. + */ + public byte[] getIV() + { + return iv; + } + + /** + * Get the number of rounds. + * + * @return The number of rounds. + */ + public int getRounds() + { + return rounds; + } + + /** + * Get the version number. + * + * @return The version number. + */ + public int getVersion() + { + return version; + } + + /** + * Get the word size, in bits. + * + * @return The word size, in bits. + */ + public int getWordSize() + { + return wordSize; + } + + public boolean equals(Object o) + { + if (this == o) return true; + byte[] oiv = ((RC5ParameterSpec) o).getIV(); + if (iv != oiv) + { + if (iv == null || oiv == null) return false; + if (iv.length != oiv.length) return false; + for (int i = 0; i < iv.length; i++) + { + if (iv[i] != oiv[i]) + { + return false; + } + } + } + return rounds == ((RC5ParameterSpec) o).getRounds() + && version == ((RC5ParameterSpec) o).getVersion() + && wordSize == ((RC5ParameterSpec) o).getWordSize(); + } + + public int hashCode() + { + int code = rounds + version + wordSize; + if (iv != null) + { + for (int i = 0; i < iv.length; i++) + { + code += iv[i]; + } + } + return code; + } +} |