com.Ostermiller.util

Class MD5OutputStream

java.lang.Object

java.io.OutputStream

java.io.FilterOutputStream

com.Ostermiller.util.MD5OutputStream

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable, java.lang.AutoCloseable

public class MD5OutputStream
extends java.io.FilterOutputStream

Implements MD5 functionality on a stream. More information about this class is available from ostermiller.org.

This class produces a 128-bit "fingerprint" or "message digest" for all data written to this stream. It is conjectured that it is computationally infeasible to produce two messages having the same message digest, or to produce any message having a given pre-specified target message digest. The MD5 algorithm is intended for digital signature applications, where a large file must be "compressed" in a secure manner before being encrypted with a private (secret) key under a public-key cryptosystem such as RSA.

For more information see RFC1321.

Since:

ostermillerutils 1.00.00

See Also:

MD5, MD5InputStream

Field Summary

Fields inherited from class java.io.FilterOutputStream

out

Constructor Summary

Constructors

Constructor and Description
MD5OutputStream(java.io.OutputStream out) Creates MD5OutputStream

Method Summary

Modifier and Type	Method and Description
byte[]	getHash() Returns array of bytes representing hash of the stream so far.
java.lang.String	getHashString() Get a 32-character hex representation representing hash of the stream so far.
void	write(byte[] b, int off, int len) Writes length bytes from the specified byte array starting a offset off to this output stream.
void	write(int b) Writes the specified byte to this output stream.

Methods inherited from class java.io.FilterOutputStream

close, flush, write

Methods inherited from class java.lang.Object

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

Constructor Detail

MD5OutputStream

public MD5OutputStream(java.io.OutputStream out)

Creates MD5OutputStream

Parameters:

out - The output stream

Since:

ostermillerutils 1.00.00

Method Detail

write

public void write(int b)
           throws java.io.IOException

Writes the specified byte to this output stream.

Overrides:

write in class java.io.FilterOutputStream

Parameters:

b - the byte.

Throws:

java.io.IOException - if an I/O error occurs.

Since:

ostermillerutils 1.00.00

write

public void write(byte[] b,
                  int off,
                  int len)
           throws java.io.IOException

Writes length bytes from the specified byte array starting a offset off to this output stream.

Overrides:

write in class java.io.FilterOutputStream

Parameters:

b - the data.

off - the start offset in the data.

len - the number of bytes to write.

Throws:

java.io.IOException - if an I/O error occurs.

Since:

ostermillerutils 1.00.00

getHash

public byte[] getHash()

Returns array of bytes representing hash of the stream so far.

Returns:

Array of 16 bytes, the hash of all written bytes.

Since:

ostermillerutils 1.00.00

getHashString

public java.lang.String getHashString()

Get a 32-character hex representation representing hash of the stream so far.

Returns:

A string containing the hash of all written bytes.

Since:

ostermillerutils 1.00.00