0N/A/*
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2362N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
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0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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0N/A */
0N/A
0N/Apackage javax.crypto.spec;
0N/A
0N/Aimport java.security.spec.AlgorithmParameterSpec;
0N/A
0N/A/**
0N/A * This class specifies the parameters used with the
0N/A * <a href="http://www.ietf.org/rfc/rfc2040.txt"><i>RC5</i></a>
0N/A * algorithm.
0N/A *
0N/A * <p> The parameters consist of a version number, a rounds count, a word
0N/A * size, and optionally an initialization vector (IV) (only in feedback mode).
0N/A *
0N/A * <p> This class can be used to initialize a <code>Cipher</code> object that
0N/A * implements the <i>RC5</i> algorithm as supplied by
0N/A * <a href="http://www.rsasecurity.com">RSA Security Inc.</a>,
0N/A * or any parties authorized by RSA Security.
0N/A *
0N/A * @author Jan Luehe
0N/A *
0N/A * @since 1.4
0N/A */
0N/Apublic class RC5ParameterSpec implements AlgorithmParameterSpec {
0N/A
0N/A private byte[] iv = null;
0N/A private int version;
0N/A private int rounds;
0N/A private int wordSize; // the word size in bits
0N/A
0N/A /**
0N/A * Constructs a parameter set for RC5 from the given version, number of
0N/A * rounds and word size (in bits).
0N/A *
0N/A * @param version the version.
0N/A * @param rounds the number of rounds.
0N/A * @param wordSize the word size in bits.
0N/A */
0N/A public RC5ParameterSpec(int version, int rounds, int wordSize) {
0N/A this.version = version;
0N/A this.rounds = rounds;
0N/A this.wordSize = wordSize;
0N/A }
0N/A
0N/A /**
0N/A * Constructs a parameter set for RC5 from the given version, number of
0N/A * rounds, word size (in bits), and IV.
0N/A *
0N/A * <p> Note that the size of the IV (block size) must be twice the word
0N/A * size. The bytes that constitute the IV are those between
0N/A * <code>iv[0]</code> and <code>iv[2*(wordSize/8)-1]</code> inclusive.
0N/A *
0N/A * @param version the version.
0N/A * @param rounds the number of rounds.
0N/A * @param wordSize the word size in bits.
0N/A * @param iv the buffer with the IV. The first <code>2*(wordSize/8)
0N/A * </code> bytes of the buffer are copied to protect against subsequent
0N/A * modification.
0N/A * @exception IllegalArgumentException if <code>iv</code> is
0N/A * <code>null</code> or <code>(iv.length < 2 * (wordSize / 8))</code>
0N/A */
0N/A public RC5ParameterSpec(int version, int rounds, int wordSize, byte[] iv) {
0N/A this(version, rounds, wordSize, iv, 0);
0N/A }
0N/A
0N/A /**
0N/A * Constructs a parameter set for RC5 from the given version, number of
0N/A * rounds, word size (in bits), and IV.
0N/A *
0N/A * <p> The IV is taken from <code>iv</code>, starting at
0N/A * <code>offset</code> inclusive.
0N/A * Note that the size of the IV (block size), starting at
0N/A * <code>offset</code> inclusive, must be twice the word size.
0N/A * The bytes that constitute the IV are those between
0N/A * <code>iv[offset]</code> and <code>iv[offset+2*(wordSize/8)-1]</code>
0N/A * inclusive.
0N/A *
0N/A * @param version the version.
0N/A * @param rounds the number of rounds.
0N/A * @param wordSize the word size in bits.
0N/A * @param iv the buffer with the IV. The first <code>2*(wordSize/8)
0N/A * </code> bytes of the buffer beginning at <code>offset</code>
0N/A * inclusive are copied to protect against subsequent modification.
0N/A * @param offset the offset in <code>iv</code> where the IV starts.
0N/A * @exception IllegalArgumentException if <code>iv</code> is
0N/A * <code>null</code> or
0N/A * <code>(iv.length - offset < 2 * (wordSize / 8))</code>
0N/A */
0N/A public RC5ParameterSpec(int version, int rounds, int wordSize,
0N/A byte[] iv, int offset) {
0N/A this.version = version;
0N/A this.rounds = rounds;
0N/A this.wordSize = wordSize;
0N/A if (iv == null) throw new IllegalArgumentException("IV missing");
0N/A int blockSize = (wordSize / 8) * 2;
0N/A if (iv.length - offset < blockSize) {
0N/A throw new IllegalArgumentException("IV too short");
0N/A }
0N/A this.iv = new byte[blockSize];
0N/A System.arraycopy(iv, offset, this.iv, 0, blockSize);
0N/A }
0N/A
0N/A /**
0N/A * Returns the version.
0N/A *
0N/A * @return the version.
0N/A */
0N/A public int getVersion() {
0N/A return this.version;
0N/A }
0N/A
0N/A /**
0N/A * Returns the number of rounds.
0N/A *
0N/A * @return the number of rounds.
0N/A */
0N/A public int getRounds() {
0N/A return this.rounds;
0N/A }
0N/A
0N/A /**
0N/A * Returns the word size in bits.
0N/A *
0N/A * @return the word size in bits.
0N/A */
0N/A public int getWordSize() {
0N/A return this.wordSize;
0N/A }
0N/A
0N/A /**
0N/A * Returns the IV or null if this parameter set does not contain an IV.
0N/A *
0N/A * @return the IV or null if this parameter set does not contain an IV.
0N/A * Returns a new array each time this method is called.
0N/A */
0N/A public byte[] getIV() {
0N/A return (iv == null? null:(byte[])iv.clone());
0N/A }
0N/A
0N/A /**
0N/A * Tests for equality between the specified object and this
0N/A * object. Two RC5ParameterSpec objects are considered equal if their
0N/A * version numbers, number of rounds, word sizes, and IVs are equal.
0N/A * (Two IV references are considered equal if both are <tt>null</tt>.)
0N/A *
0N/A * @param obj the object to test for equality with this object.
0N/A *
0N/A * @return true if the objects are considered equal, false if
0N/A * <code>obj</code> is null or otherwise.
0N/A */
0N/A public boolean equals(Object obj) {
0N/A if (obj == this) {
0N/A return true;
0N/A }
0N/A if (!(obj instanceof RC5ParameterSpec)) {
0N/A return false;
0N/A }
0N/A RC5ParameterSpec other = (RC5ParameterSpec) obj;
0N/A
0N/A return ((version == other.version) &&
0N/A (rounds == other.rounds) &&
0N/A (wordSize == other.wordSize) &&
0N/A java.util.Arrays.equals(iv, other.iv));
0N/A }
0N/A
0N/A /**
0N/A * Calculates a hash code value for the object.
0N/A * Objects that are equal will also have the same hashcode.
0N/A */
0N/A public int hashCode() {
0N/A int retval = 0;
0N/A if (iv != null) {
0N/A for (int i = 1; i < iv.length; i++) {
0N/A retval += iv[i] * i;
0N/A }
0N/A }
0N/A retval += (version + rounds + wordSize);
0N/A return retval;
0N/A }
0N/A}