author | avstepan |
Tue, 25 Aug 2015 18:45:09 +0300 | |
changeset 32275 | 17eeb583a331 |
parent 25859 | 3317bb8137f4 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package javax.crypto.spec; |
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import java.security.spec.AlgorithmParameterSpec; |
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/** |
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* This class specifies the parameters used with the |
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* <a href="http://www.ietf.org/rfc/rfc2268.txt"><i>RC2</i></a> |
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* algorithm. |
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* |
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* <p> The parameters consist of an effective key size and optionally |
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* an 8-byte initialization vector (IV) (only in feedback mode). |
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* |
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* <p> This class can be used to initialize a {@code Cipher} object that |
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* implements the <i>RC2</i> algorithm. |
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* |
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* @author Jan Luehe |
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* |
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* @since 1.4 |
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*/ |
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public class RC2ParameterSpec implements AlgorithmParameterSpec { |
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private byte[] iv = null; |
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private int effectiveKeyBits; |
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/** |
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* Constructs a parameter set for RC2 from the given effective key size |
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* (in bits). |
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* |
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* @param effectiveKeyBits the effective key size in bits. |
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*/ |
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public RC2ParameterSpec(int effectiveKeyBits) { |
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this.effectiveKeyBits = effectiveKeyBits; |
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} |
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/** |
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* Constructs a parameter set for RC2 from the given effective key size |
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* (in bits) and an 8-byte IV. |
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* |
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* <p> The bytes that constitute the IV are those between |
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* {@code iv[0]} and {@code iv[7]} inclusive. |
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* |
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* @param effectiveKeyBits the effective key size in bits. |
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* @param iv the buffer with the 8-byte IV. The first 8 bytes of |
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* the buffer are copied to protect against subsequent modification. |
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* @exception IllegalArgumentException if {@code iv} is null. |
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*/ |
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public RC2ParameterSpec(int effectiveKeyBits, byte[] iv) { |
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this(effectiveKeyBits, iv, 0); |
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} |
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/** |
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* Constructs a parameter set for RC2 from the given effective key size |
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* (in bits) and IV. |
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* |
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* <p> The IV is taken from {@code iv}, starting at |
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* {@code offset} inclusive. |
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* The bytes that constitute the IV are those between |
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* {@code iv[offset]} and {@code iv[offset+7]} inclusive. |
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* |
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* @param effectiveKeyBits the effective key size in bits. |
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* @param iv the buffer with the IV. The first 8 bytes |
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* of the buffer beginning at {@code offset} inclusive |
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* are copied to protect against subsequent modification. |
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* @param offset the offset in {@code iv} where the 8-byte IV |
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* starts. |
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* @exception IllegalArgumentException if {@code iv} is null. |
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*/ |
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public RC2ParameterSpec(int effectiveKeyBits, byte[] iv, int offset) { |
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this.effectiveKeyBits = effectiveKeyBits; |
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if (iv == null) throw new IllegalArgumentException("IV missing"); |
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int blockSize = 8; |
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if (iv.length - offset < blockSize) { |
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throw new IllegalArgumentException("IV too short"); |
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} |
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this.iv = new byte[blockSize]; |
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System.arraycopy(iv, offset, this.iv, 0, blockSize); |
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} |
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/** |
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* Returns the effective key size in bits. |
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* |
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* @return the effective key size in bits. |
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*/ |
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public int getEffectiveKeyBits() { |
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return this.effectiveKeyBits; |
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} |
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/** |
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* Returns the IV or null if this parameter set does not contain an IV. |
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* |
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* @return the IV or null if this parameter set does not contain an IV. |
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* Returns a new array each time this method is called. |
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*/ |
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public byte[] getIV() { |
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return (iv == null? null:iv.clone()); |
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} |
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/** |
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* Tests for equality between the specified object and this |
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* object. Two RC2ParameterSpec objects are considered equal if their |
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* effective key sizes and IVs are equal. |
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* (Two IV references are considered equal if both are {@code null}.) |
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* |
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* @param obj the object to test for equality with this object. |
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* |
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* @return true if the objects are considered equal, false if |
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* {@code obj} is null or otherwise. |
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*/ |
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public boolean equals(Object obj) { |
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if (obj == this) { |
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return true; |
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} |
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if (!(obj instanceof RC2ParameterSpec)) { |
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return false; |
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} |
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RC2ParameterSpec other = (RC2ParameterSpec) obj; |
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return ((effectiveKeyBits == other.effectiveKeyBits) && |
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java.util.Arrays.equals(iv, other.iv)); |
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} |
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/** |
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* Calculates a hash code value for the object. |
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* Objects that are equal will also have the same hashcode. |
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*/ |
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public int hashCode() { |
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int retval = 0; |
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if (iv != null) { |
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for (int i = 1; i < iv.length; i++) { |
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retval += iv[i] * i; |
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} |
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} |
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return (retval += effectiveKeyBits); |
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} |
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} |