/* * Copyright (c) 1998, 2007, 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 javax.crypto.spec; import java.security.spec.AlgorithmParameterSpec; /** * This class specifies the parameters used with the * <a href="http://www.ietf.org/rfc/rfc2040.txt"><i>RC5</i></a> * algorithm. * * <p> The parameters consist of a version number, a rounds count, a word * size, and optionally an initialization vector (IV) (only in feedback mode). * * <p> This class can be used to initialize a <code>Cipher</code> object that * implements the <i>RC5</i> algorithm as supplied by * <a href="http://www.rsasecurity.com">RSA Security Inc.</a>, * or any parties authorized by RSA Security. * * @author Jan Luehe * * @since 1.4 */public class RC5ParameterSpec implements AlgorithmParameterSpec { private byte[] iv = null; private int version; private int rounds; private int wordSize; // the word size in bits /** * Constructs a parameter set for RC5 from the given version, number of * rounds and word size (in bits). * * @param version the version. * @param rounds the number of rounds. * @param wordSize the word size in bits. */ public RC5ParameterSpec(int version, int rounds, int wordSize) { this.version = version; this.rounds = rounds; this.wordSize = wordSize; } /** * Constructs a parameter set for RC5 from the given version, number of * rounds, word size (in bits), and IV. * * <p> Note that the size of the IV (block size) must be twice the word * size. The bytes that constitute the IV are those between * <code>iv[0]</code> and <code>iv[2*(wordSize/8)-1]</code> inclusive. * * @param version the version. * @param rounds the number of rounds. * @param wordSize the word size in bits. * @param iv the buffer with the IV. The first <code>2*(wordSize/8) * </code> bytes of the buffer are copied to protect against subsequent * modification. * @exception IllegalArgumentException if <code>iv</code> is * <code>null</code> or <code>(iv.length < 2 * (wordSize / 8))</code> */ public RC5ParameterSpec(int version, int rounds, int wordSize, byte[] iv) { this(version, rounds, wordSize, iv, 0); } /** * Constructs a parameter set for RC5 from the given version, number of * rounds, word size (in bits), and IV. * * <p> The IV is taken from <code>iv</code>, starting at * <code>offset</code> inclusive. * Note that the size of the IV (block size), starting at * <code>offset</code> inclusive, must be twice the word size. * The bytes that constitute the IV are those between * <code>iv[offset]</code> and <code>iv[offset+2*(wordSize/8)-1]</code> * inclusive. * * @param version the version. * @param rounds the number of rounds. * @param wordSize the word size in bits. * @param iv the buffer with the IV. The first <code>2*(wordSize/8) * </code> bytes of the buffer beginning at <code>offset</code> * inclusive are copied to protect against subsequent modification. * @param offset the offset in <code>iv</code> where the IV starts. * @exception IllegalArgumentException if <code>iv</code> is * <code>null</code> or * <code>(iv.length - offset < 2 * (wordSize / 8))</code> */ public RC5ParameterSpec(int version, int rounds, int wordSize, byte[] iv, int offset) { this.version = version; this.rounds = rounds; this.wordSize = wordSize; if (iv == null) throw new IllegalArgumentException("IV missing"); int blockSize = (wordSize / 8) * 2; if (iv.length - offset < blockSize) { throw new IllegalArgumentException("IV too short"); } this.iv = new byte[blockSize]; System.arraycopy(iv, offset, this.iv, 0, blockSize); } /** * Returns the version. * * @return the version. */ public int getVersion() { return this.version; } /** * Returns the number of rounds. * * @return the number of rounds. */ public int getRounds() { return this.rounds; } /** * Returns the word size in bits. * * @return the word size in bits. */ public int getWordSize() { return this.wordSize; } /** * Returns the IV or null if this parameter set does not contain an IV. * * @return the IV or null if this parameter set does not contain an IV. * Returns a new array each time this method is called. */ public byte[] getIV() { return (iv == null? null:(byte[])iv.clone()); } /** * Tests for equality between the specified object and this * object. Two RC5ParameterSpec objects are considered equal if their * version numbers, number of rounds, word sizes, and IVs are equal. * (Two IV references are considered equal if both are <tt>null</tt>.) * * @param obj the object to test for equality with this object. * * @return true if the objects are considered equal, false if * <code>obj</code> is null or otherwise. */ public boolean equals(Object obj) { if (obj == this) { return true; } if (!(obj instanceof RC5ParameterSpec)) { return false; } RC5ParameterSpec other = (RC5ParameterSpec) obj; return ((version == other.version) && (rounds == other.rounds) && (wordSize == other.wordSize) && java.util.Arrays.equals(iv, other.iv)); } /** * Calculates a hash code value for the object. * Objects that are equal will also have the same hashcode. */ public int hashCode() { int retval = 0; if (iv != null) { for (int i = 1; i < iv.length; i++) { retval += iv[i] * i; } } retval += (version + rounds + wordSize); return retval; }}
/*
* Copyright (c) 1998, 2007, 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 javax.crypto.spec;
import java.security.spec.AlgorithmParameterSpec;
/**
* This class specifies the parameters used with the
* <a href="http://www.ietf.org/rfc/rfc2040.txt"><i>RC5</i></a>
* algorithm.
*
* <p> The parameters consist of a version number, a rounds count, a word
* size, and optionally an initialization vector (IV) (only in feedback mode).
*
* <p> This class can be used to initialize a <code>Cipher</code> object that
* implements the <i>RC5</i> algorithm as supplied by
* <a href="http://www.rsasecurity.com">RSA Security Inc.</a>,
* or any parties authorized by RSA Security.
*
* @author Jan Luehe
*
* @since 1.4
*/
public class RC5ParameterSpec implements AlgorithmParameterSpec {
private byte[] iv = null;
private int version;
private int rounds;
private int wordSize; // the word size in bits
/**
* Constructs a parameter set for RC5 from the given version, number of
* rounds and word size (in bits).
*
* @param version the version.
* @param rounds the number of rounds.
* @param wordSize the word size in bits.
*/
public RC5ParameterSpec(int version, int rounds, int wordSize) {
this.version = version;
this.rounds = rounds;
this.wordSize = wordSize;
}
/**
* Constructs a parameter set for RC5 from the given version, number of
* rounds, word size (in bits), and IV.
*
* <p> Note that the size of the IV (block size) must be twice the word
* size. The bytes that constitute the IV are those between
* <code>iv[0]</code> and <code>iv[2*(wordSize/8)-1]</code> inclusive.
*
* @param version the version.
* @param rounds the number of rounds.
* @param wordSize the word size in bits.
* @param iv the buffer with the IV. The first <code>2*(wordSize/8)
* </code> bytes of the buffer are copied to protect against subsequent
* modification.
* @exception IllegalArgumentException if <code>iv</code> is
* <code>null</code> or <code>(iv.length < 2 * (wordSize / 8))</code>
*/
public RC5ParameterSpec(int version, int rounds, int wordSize, byte[] iv) {
this(version, rounds, wordSize, iv, 0);
}
/**
* Constructs a parameter set for RC5 from the given version, number of
* rounds, word size (in bits), and IV.
*
* <p> The IV is taken from <code>iv</code>, starting at
* <code>offset</code> inclusive.
* Note that the size of the IV (block size), starting at
* <code>offset</code> inclusive, must be twice the word size.
* The bytes that constitute the IV are those between
* <code>iv[offset]</code> and <code>iv[offset+2*(wordSize/8)-1]</code>
* inclusive.
*
* @param version the version.
* @param rounds the number of rounds.
* @param wordSize the word size in bits.
* @param iv the buffer with the IV. The first <code>2*(wordSize/8)
* </code> bytes of the buffer beginning at <code>offset</code>
* inclusive are copied to protect against subsequent modification.
* @param offset the offset in <code>iv</code> where the IV starts.
* @exception IllegalArgumentException if <code>iv</code> is
* <code>null</code> or
* <code>(iv.length - offset < 2 * (wordSize / 8))</code>
*/
public RC5ParameterSpec(int version, int rounds, int wordSize,
byte[] iv, int offset) {
this.version = version;
this.rounds = rounds;
this.wordSize = wordSize;
if (iv == null) throw new IllegalArgumentException("IV missing");
int blockSize = (wordSize / 8) * 2;
if (iv.length - offset < blockSize) {
throw new IllegalArgumentException("IV too short");
}
this.iv = new byte[blockSize];
System.arraycopy(iv, offset, this.iv, 0, blockSize);
}
/**
* Returns the version.
*
* @return the version.
*/
public int getVersion() {
return this.version;
}
/**
* Returns the number of rounds.
*
* @return the number of rounds.
*/
public int getRounds() {
return this.rounds;
}
/**
* Returns the word size in bits.
*
* @return the word size in bits.
*/
public int getWordSize() {
return this.wordSize;
}
/**
* Returns the IV or null if this parameter set does not contain an IV.
*
* @return the IV or null if this parameter set does not contain an IV.
* Returns a new array each time this method is called.
*/
public byte[] getIV() {
return (iv == null? null:(byte[])iv.clone());
}
/**
* Tests for equality between the specified object and this
* object. Two RC5ParameterSpec objects are considered equal if their
* version numbers, number of rounds, word sizes, and IVs are equal.
* (Two IV references are considered equal if both are <tt>null</tt>.)
*
* @param obj the object to test for equality with this object.
*
* @return true if the objects are considered equal, false if
* <code>obj</code> is null or otherwise.
*/
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof RC5ParameterSpec)) {
return false;
}
RC5ParameterSpec other = (RC5ParameterSpec) obj;
return ((version == other.version) &&
(rounds == other.rounds) &&
(wordSize == other.wordSize) &&
java.util.Arrays.equals(iv, other.iv));
}
/**
* Calculates a hash code value for the object.
* Objects that are equal will also have the same hashcode.
*/
public int hashCode() {
int retval = 0;
if (iv != null) {
for (int i = 1; i < iv.length; i++) {
retval += iv[i] * i;
}
}
retval += (version + rounds + wordSize);
return retval;
}
}