com.novell.java.security
Class MessageDigestSpi

java.lang.Object
  |
  +--com.novell.java.security.MessageDigestSpi

public abstract class MessageDigestSpi

extends java.lang.Object

Defines the Service Provider Interface (SPI) for the MessageDigest class. The MessageDigest class provides the functionality of a message digest algorithm, such as MD5 or SHA. Message digests are secure one-way hash functions that take arbitrary-sized data and output a fixed-length hash value.

All the abstract methods in this class must be implemented by a cryptographic service provider who wishes to supply the implementation of a particular message digest algorithm. Implementations are free to implement the Cloneable interface.

See Also:

MessageDigest

Constructor Summary

MessageDigestSpi()

Method Summary

java.lang.Object

clone() Creates a new message digest object of the same class as this message digest object.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MessageDigestSpi

public MessageDigestSpi()

Method Detail

clone

public java.lang.Object clone()
                       throws java.lang.CloneNotSupportedException

Creates a new message digest object of the same class as this message digest object. It then initializes each of the new object's fields by assigning it the same value as the corresponding field in this object. The clone() method will only clone a message digest object if the implementation is Cloneable. A class indicates that its instances can be cloned by declaring that it implements the Cloneable interface.

Returns:

a clone if the implementation is cloneable.

Throws:

java.lang.CloneNotSupportedException - Thrown if the clone() method is called on an implementation that does not support Cloneable.