The parameters consist of a version number, a rounds count, a word * size, and optionally an initialization vector (IV) (only in feedback mode). * *
This class can be used to initialize a Cipher object that
* implements the RC5 algorithm as supplied by
* RSA Security Inc.,
* 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.
*
*
Note that the size of the IV (block size) must be twice the word
* size. The bytes that constitute the IV are those between
* iv[0] and iv[2*(wordSize/8)-1] 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 2*(wordSize/8)
* bytes of the buffer are copied to protect against subsequent
* modification.
* @exception IllegalArgumentException if iv is
* null or (iv.length < 2 * (wordSize / 8))
*/
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.
*
*
The IV is taken from iv, starting at
* offset inclusive.
* Note that the size of the IV (block size), starting at
* offset inclusive, must be twice the word size.
* The bytes that constitute the IV are those between
* iv[offset] and iv[offset+2*(wordSize/8)-1]
* 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 2*(wordSize/8)
* bytes of the buffer beginning at offset
* inclusive are copied to protect against subsequent modification.
* @param offset the offset in iv where the IV starts.
* @exception IllegalArgumentException if iv is
* null or
* (iv.length - offset < 2 * (wordSize / 8))
*/
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 null.)
*
* @param obj the object to test for equality with this object.
*
* @return true if the objects are considered equal, false if
* obj 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;
}
}