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javax.crypto.spec
Class RC2ParameterSpec  

java.lang.Object
  javax.crypto.spec.RC2ParameterSpec

All Implemented Interfaces:

java.security.spec.AlgorithmParameterSpec

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public class RC2ParameterSpec

extends java.lang.Object

implements java.security.spec.AlgorithmParameterSpec

A wrapper for parameters for the RC2 block cipher ("RC" means either "Rivest Cipher" or "Ron's Code", depending upon who you ask and when).

Since:

1.4

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Field Summary
private  int	effectiveKeyBits           The effective key length, in bits.
private  byte[]	iv           The initialization vector.
private static int	RC2_IV_LENGTH           The length of an RC2 IV, in bytes.

 

Constructor Summary

RC2ParameterSpec(int effectiveKeyBits)           Create RC2 parameters without an IV.

RC2ParameterSpec(int effectiveKeyBits, byte[] iv)           Create RC2 parameters with an IV.

RC2ParameterSpec(int effectiveKeyBits, byte[] iv, int offset)           Create RC2 parameters with an IV.

 

Method Summary
boolean	equals(java.lang.Object o)           Determine whether this Object is semantically equal to another Object.
int	getEffectiveKeyBits()           Get the number of effective key bits.
byte[]	getIV()           Return the initialization vector, or null if none was specified.
int	hashCode()           Get a value that represents this Object, as uniquely as possible within the confines of an int.

 

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

RC2_IV_LENGTH

private static final int RC2_IV_LENGTH

The length of an RC2 IV, in bytes.

See Also:

Constant Field Values

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effectiveKeyBits

private int effectiveKeyBits

The effective key length, in bits.

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iv

private byte[] iv

The initialization vector.

Constructor Detail

RC2ParameterSpec

public RC2ParameterSpec(int effectiveKeyBits)

Create RC2 parameters without an IV.

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RC2ParameterSpec

public RC2ParameterSpec(int effectiveKeyBits,
                        byte[] iv)

Create RC2 parameters with an IV.

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RC2ParameterSpec

public RC2ParameterSpec(int effectiveKeyBits,
                        byte[] iv,
                        int offset)

Create RC2 parameters with an IV.

Method Detail

getEffectiveKeyBits

public int getEffectiveKeyBits()

Get the number of effective key bits.

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getIV

public byte[] getIV()

Return the initialization vector, or null if none was specified.

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equals

public boolean equals(java.lang.Object o)

Description copied from class: java.lang.Object

Determine whether this Object is semantically equal to another Object.

There are some fairly strict requirements on this method which subclasses must follow:

• It must be transitive. If a.equals(b) and b.equals(c), then a.equals(c) must be true as well.
• It must be symmetric. a.equals(b) and b.equals(a) must have the same value.
• It must be reflexive. a.equals(a) must always be true.
• It must be consistent. Whichever value a.equals(b) returns on the first invocation must be the value returned on all later invocations.
• a.equals(null) must be false.
• It must be consistent with hashCode(). That is, a.equals(b) must imply a.hashCode() == b.hashCode(). The reverse is not true; two objects that are not equal may have the same hashcode, but that has the potential to harm hashing performance.

This is typically overridden to throw a java.lang.ClassCastException if the argument is not comparable to the class performing the comparison, but that is not a requirement. It is legal for a.equals(b) to be true even though a.getClass() != b.getClass(). Also, it is typical to never cause a java.lang.NullPointerException.

In general, the Collections API (java.util) use the equals method rather than the == operator to compare objects. However, java.util.IdentityHashMap is an exception to this rule, for its own good reasons.

The default implementation returns this == o.

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hashCode

public int hashCode()

Description copied from class: java.lang.Object

Get a value that represents this Object, as uniquely as possible within the confines of an int.

There are some requirements on this method which subclasses must follow:

• Semantic equality implies identical hashcodes. In other words, if a.equals(b) is true, then a.hashCode() == b.hashCode() must be as well. However, the reverse is not necessarily true, and two objects may have the same hashcode without being equal.
• It must be consistent. Whichever value o.hashCode() returns on the first invocation must be the value returned on all later invocations as long as the object exists. Notice, however, that the result of hashCode may change between separate executions of a Virtual Machine, because it is not invoked on the same object.

Notice that since hashCode is used in java.util.Hashtable and other hashing classes, a poor implementation will degrade the performance of hashing (so don't blindly implement it as returning a constant!). Also, if calculating the hash is time-consuming, a class may consider caching the results.

The default implementation returns System.identityHashCode(this)

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