Module ibm.crypto.hdwrcca
Package com.ibm.crypto.hdwrCCA.provider

Class SHA224

java.lang.Object
java.security.MessageDigestSpi
com.ibm.crypto.hdwrCCA.provider.SHA224
All Implemented Interfaces:
Cloneable
public final class SHA224 extends MessageDigestSpi
This class implements the Secure Hash Algorithm 224 (SHA224) developed by the National Institute of Standards and Technology along with the National Security Agency.

  • Constructor Summary

    Constructors
    Constructor
    Description
    SHA224()
    Standard constructor, creates a new SHA224 instance, allocates its buffers from the heap.

  • Method Summary

    Modifier and Type
    Method
    Description
    Object
    clone()
    Clones this object.
    protected byte[]
    engineDigest()
    Computes and returns the SHA hash.
    protected int
    engineDigest(byte[] buf, int offset, int len)
    Computes and returns the SHA hash in the buffer provided.
    protected int
    engineGetDigestLength()
    Return the digest length in bytes.
    protected void
    engineReset()
    Resets the SHA information back to starting values.
    protected void
    engineUpdate(byte b)
    Update adds the passed byte to the digested data.
    protected void
    engineUpdate(byte[] input, int offset, int len)
    Update adds the selected part of an array of bytes to the digest.
    void
    init()
    Initializes the SHA information.

    Methods inherited from class java.security.MessageDigestSpi

    engineUpdate

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • SHA224

      public SHA224()
      Standard constructor, creates a new SHA224 instance, allocates its buffers from the heap.

  • Method Details

    • init

      public void init()
      Initializes the SHA information.

    • engineReset

      protected void engineReset()
      Resets the SHA information back to starting values.
      Specified by:
      engineReset in class MessageDigestSpi

    • engineGetDigestLength

      protected int engineGetDigestLength()
      Return the digest length in bytes.
      Overrides:
      engineGetDigestLength in class MessageDigestSpi

    • engineUpdate

      protected void engineUpdate(byte b)
      Update adds the passed byte to the digested data.
      Specified by:
      engineUpdate in class MessageDigestSpi
      Parameters:
      b - is the byte to update the digest with.

    • engineUpdate

      protected void engineUpdate(byte[] input, int offset, int len)
      Update adds the selected part of an array of bytes to the digest. This version is more efficient than the byte-at-a-time version; it avoids data copies and reduces per-byte call overhead.
      Specified by:
      engineUpdate in class MessageDigestSpi
      Parameters:
      input - array to be used to update digest.
      offset - the offset into the array.
      len - the length of the array.

    • engineDigest

      protected byte[] engineDigest()
      Computes and returns the SHA hash.
      Specified by:
      engineDigest in class MessageDigestSpi
      Returns:
      the SHA hash.

    • engineDigest

      protected int engineDigest(byte[] buf, int offset, int len) throws DigestException
      Computes and returns the SHA hash in the buffer provided.
      Overrides:
      engineDigest in class MessageDigestSpi
      Parameters:
      buf - the buffer to put the MD5 hash into.
      offset - is the offset in the buffer into which to copy the hash.
      len - the length of the buffer.
      Throws:
      DigestException - is thrown when buf is not large enough to hold the resulting digest.

    • clone

      public Object clone()
      Clones this object.
      Overrides:
      clone in class MessageDigestSpi