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java.security

Class DigestOutputStream

java.lang.Object
|
+--java.io.OutputStream
   |
   +--java.io.FilterOutputStream
      |
      +--java.security.DigestOutputStream


public class DigestOutputStream

extends FilterOutputStream

DigestOutputStream is a class that ties an OutputStream with a MessageDigest. The Message Digest is used by the class to update it self as bytes are written to the OutputStream. The updating to the digest depends on the on flag which is set to true by default that tells the class to update the data in the message digest.

Author:

Field Summary

java.security.MessageDigestdigest

The message digest for the DigestOutputStream

Constructor Summary

DigestOutputStream(java.io.OutputStream stream, java.security.MessageDigest digest)

Constructs a new DigestOutputStream.

Method Summary

java.security.MessageDigestgetMessageDigest()

Returns the MessageDigest associated with this DigestOutputStream
voidon(boolean on)

Sets the flag specifying if this DigestOutputStream updates the digest in the write() methods.
voidsetMessageDigest(java.security.MessageDigest digest)

Sets the current MessageDigest to current parameter
java.lang.StringtoString()

Converts the output stream and underlying message digest to a string.
voidwrite(int b)

Updates the hash if the on flag is true and then writes a byte to the underlying output stream.
voidwrite(byte[] , int off, int len)

Updates the hash if the on flag is true and then writes the bytes to the underlying output stream.

Field Details

digest

protected MessageDigest digest

The message digest for the DigestOutputStream


Constructor Details

DigestOutputStream

public DigestOutputStream(java.io.OutputStream stream, java.security.MessageDigest digest)

Constructs a new DigestOutputStream. It associates a MessageDigest with the stream to compute the stream as data is written.

Parameters:


Method Details

getMessageDigest

public MessageDigest getMessageDigest()

Returns the MessageDigest associated with this DigestOutputStream

Returns:


on

public void on(boolean on)

Sets the flag specifying if this DigestOutputStream updates the digest in the write() methods. The default is on;

Parameters:


setMessageDigest

public void setMessageDigest(java.security.MessageDigest digest)

Sets the current MessageDigest to current parameter

Parameters:


toString

public String toString()

Converts the output stream and underlying message digest to a string.

Returns:


write

public void write(byte[] , int off, int len)

Updates the hash if the on flag is true and then writes the bytes to the underlying output stream.

Parameters:

Throws:


write

public void write(int b)

Updates the hash if the on flag is true and then writes a byte to the underlying output stream.

Parameters:

Throws: