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

Class SHA224

  • All Implemented Interfaces:
    java.lang.Cloneable
    public final class SHA224
extends java.security.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

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.lang.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 Detail

      • SHA224

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

    • Method Detail

      • 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 java.security.MessageDigestSpi

      • engineGetDigestLength

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

      • engineUpdate

        protected void engineUpdate​(byte b)
        Update adds the passed byte to the digested data.
        Specified by:
        engineUpdate in class java.security.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 java.security.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 java.security.MessageDigestSpi
        Returns:
        the SHA hash.

      • engineDigest

        protected int engineDigest​(byte[] buf,
                           int offset,
                           int len)
                    throws java.security.DigestException
        Computes and returns the SHA hash in the buffer provided.
        Overrides:
        engineDigest in class java.security.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:
        java.security.DigestException - is thrown when buf is not large enough to hold the resulting digest.

      • clone

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