edu.rice.cs.plt.io
Class MessageDigestOutputStream

java.lang.Object
  java.io.OutputStream
      edu.rice.cs.plt.io.DirectOutputStream
          edu.rice.cs.plt.io.MessageDigestOutputStream

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable

public class MessageDigestOutputStream
extends DirectOutputStream

A stream that accumulates its bytes in a MessageDigest object.

Field Summary

Fields inherited from class edu.rice.cs.plt.io.DirectOutputStream

DEFAULT_BUFFER_SIZE

Constructor Summary

MessageDigestOutputStream(java.security.MessageDigest messageDigest)
Instantiate with the given MessageDigest.

Method Summary

void	close()
byte[]	digest() Return messageDigest.digest().
void	flush()
static MessageDigestOutputStream	makeMD5() Create a stream for computing MD5 hashes.
static MessageDigestOutputStream	makeSHA1() Create a stream for computing SHA-1 hashes.
static MessageDigestOutputStream	makeSHA256() Create a stream for computing SHA-256 hashes.
void	write(byte[] bbuf) Delegate to the more general DirectOutputStream.write(byte[], int, int) method
void	write(byte[] bbuf, int offset, int len) Subclasses are, at a minimum, required to implement this method.
void	write(int b) Delegate to the more general DirectOutputStream.write(byte[], int, int) method

Methods inherited from class edu.rice.cs.plt.io.DirectOutputStream

write, write, write, writeAll, writeAll, writeAll

Methods inherited from class java.lang.Object

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

Constructor Detail

MessageDigestOutputStream

public MessageDigestOutputStream(java.security.MessageDigest messageDigest)

Instantiate with the given MessageDigest. messageDigest will not be reset, and may contain a partially-computed digest.

Method Detail

digest

public byte[] digest()

Return messageDigest.digest().

close

public void close()

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.OutputStream

flush

public void flush()

Specified by:

flush in interface java.io.Flushable

Overrides:

flush in class java.io.OutputStream

write

public void write(byte[] bbuf)

Description copied from class: DirectOutputStream

Delegate to the more general DirectOutputStream.write(byte[], int, int) method

Overrides:

write in class DirectOutputStream

write

public void write(byte[] bbuf,
                  int offset,
                  int len)

Description copied from class: DirectOutputStream

Subclasses are, at a minimum, required to implement this method.

Specified by:

write in class DirectOutputStream

write

public void write(int b)

Description copied from class: DirectOutputStream

Delegate to the more general DirectOutputStream.write(byte[], int, int) method

Overrides:

write in class DirectOutputStream

makeMD5

public static MessageDigestOutputStream makeMD5()

Create a stream for computing MD5 hashes. Throws a RuntimeException with a NoSuchAlgorithmException cause if the MD5 algorithm implementation cannot be located.

makeSHA1

public static MessageDigestOutputStream makeSHA1()

Create a stream for computing SHA-1 hashes. Throws a RuntimeException with a NoSuchAlgorithmException cause if the SHA-1 algorithm implementation cannot be located.

makeSHA256

public static MessageDigestOutputStream makeSHA256()

Create a stream for computing SHA-256 hashes. Throws a RuntimeException with a NoSuchAlgorithmException cause if the SHA-256 algorithm implementation cannot be located.