Class SHA1Digest

java.lang.Object
org.gudy.bouncycastle.crypto.digests.GeneralDigest
org.gudy.bouncycastle.crypto.digests.SHA1Digest
All Implemented Interfaces:
Digest
public class SHA1Digest extends GeneralDigest
implementation of SHA-1 as outlined in "Handbook of Applied Cryptography", pages 346 - 349. It is interesting to ponder why the, apart from the extra IV, the other difference here from MD5 is the "endienness" of the word processing!

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    private static final int
    DIGEST_LENGTH
     
    private int
    H1
     
    private int
    H2
     
    private int
    H3
     
    private int
    H4
     
    private int
    H5
     
    private int[]
    X
     
    private int
    xOff
     
    private static final int
    Y1
     
    private static final int
    Y2
     
    private static final int
    Y3
     
    private static final int
    Y4
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    SHA1Digest()
    Standard constructor
    SHA1Digest(SHA1Digest t)
    Copy constructor.

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    doFinal(byte[] out, int outOff)
    close the digest, producing the final digest value.
    private int
    f(int u, int v, int w)
     
    private int
    g(int u, int v, int w)
     
    String
    getAlgorithmName()
    return the algorithm name
    int
    getDigestSize()
    return the size, in bytes, of the digest produced by this message digest.
    private int
    h(int u, int v, int w)
     
    protected void
    processBlock()
     
    protected void
    processLength(long bitLength)
     
    protected void
    processWord(byte[] in, int inOff)
     
    void
    reset()
    reset the chaining variables
    private int
    rotateLeft(int x, int n)
     
    private void
    unpackWord(int word, byte[] out, int outOff)
     

    Methods inherited from class GeneralDigest

    finish, update, update

    Methods inherited from class Object

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

  • Field Details

  • Constructor Details

    • SHA1Digest

      public SHA1Digest()
      Standard constructor

    • SHA1Digest

      public SHA1Digest(SHA1Digest t)
      Copy constructor. This will copy the state of the provided message digest.

  • Method Details

    • getAlgorithmName

      public String getAlgorithmName()
      Description copied from interface: Digest
      return the algorithm name
      Returns:
      the algorithm name

    • getDigestSize

      public int getDigestSize()
      Description copied from interface: Digest
      return the size, in bytes, of the digest produced by this message digest.
      Returns:
      the size, in bytes, of the digest produced by this message digest.

    • processWord

      protected void processWord(byte[] in, int inOff)
      Specified by:
      processWord in class GeneralDigest

    • unpackWord

      private void unpackWord(int word, byte[] out, int outOff)

    • processLength

      protected void processLength(long bitLength)
      Specified by:
      processLength in class GeneralDigest

    • doFinal

      public int doFinal(byte[] out, int outOff)
      Description copied from interface: Digest
      close the digest, producing the final digest value. The doFinal call leaves the digest reset.
      Parameters:
      out - the array the digest is to be copied into.
      outOff - the offset into the out array the digest is to start at.

    • reset

      public void reset()
      reset the chaining variables
      Specified by:
      reset in interface Digest
      Overrides:
      reset in class GeneralDigest

    • f

      private int f(int u, int v, int w)

    • h

      private int h(int u, int v, int w)

    • g

      private int g(int u, int v, int w)

    • rotateLeft

      private int rotateLeft(int x, int n)

    • processBlock

      protected void processBlock()
      Specified by:
      processBlock in class GeneralDigest