de.innovationgate.utils

Class SHA256HashingInputStream

java.lang.Object

java.io.InputStream

de.innovationgate.utils.SHA256HashingInputStream

All Implemented Interfaces:

java.io.Closeable

public class SHA256HashingInputStream
extends java.io.InputStream

A wrapper input stream that returns the data of the wrapped stream unmodified, but builds an SHA-256 hash from its data while reading.

Constructor Summary

Constructors

Constructor and Description
SHA256HashingInputStream(java.io.InputStream stream) Constructor

Method Summary

Methods

Modifier and Type	Method and Description
int	available()
void	close()
java.lang.String	getHash() Returns the built SHA-512 hash Base64 encoded).
byte[]	getHashBytes() Returns the built SHA-512 hash bytes.
static java.lang.String	getStreamHash(java.io.InputStream in) Reads the given input stream and returns the data hash.
static byte[]	getStreamHashBytes(java.io.InputStream in) Reads the given input stream and returns the data hash bytes.
void	mark(int readlimit)
boolean	markSupported()
int	read()
int	read(byte[] b)
int	read(byte[] b, int off, int len)
void	reset()
long	skip(long n)
java.lang.String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

SHA256HashingInputStream

public SHA256HashingInputStream(java.io.InputStream stream)
                         throws java.security.NoSuchAlgorithmException

Constructor

Parameters:

stream - The stream to wrap

Throws:

java.security.NoSuchAlgorithmException

Method Detail

getStreamHash

public static java.lang.String getStreamHash(java.io.InputStream in)
                                      throws java.security.NoSuchAlgorithmException,
                                             java.io.IOException

Reads the given input stream and returns the data hash. The input data is not conserved. Use this method if you really just want to know what hash the given data produces, but do not want to use the data actually. The input stream is closed implicitly.

Parameters:

in - The input stream

Returns:

The md5 hash of the input stream

Throws:

java.security.NoSuchAlgorithmException

java.io.IOException

getStreamHashBytes

public static byte[] getStreamHashBytes(java.io.InputStream in)
                                 throws java.security.NoSuchAlgorithmException,
                                        java.io.IOException

Reads the given input stream and returns the data hash bytes. The input data is not conserved. Use this method if you really just want to know what hash the given data produces, but do not want to use the data actually. The input stream is closed implicitly.

Parameters:

in - The input stream

Returns:

The sha-256 hash bytes

Throws:

java.security.NoSuchAlgorithmException

java.io.IOException

available

public int available()
              throws java.io.IOException

Overrides:

available in class java.io.InputStream

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.InputStream

Throws:

java.io.IOException

mark

public void mark(int readlimit)

Overrides:

mark in class java.io.InputStream

markSupported

public boolean markSupported()

Overrides:

markSupported in class java.io.InputStream

read

public int read()
         throws java.io.IOException

Specified by:

read in class java.io.InputStream

Throws:

java.io.IOException

read

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

Overrides:

read in class java.io.InputStream

Throws:

java.io.IOException

read

public int read(byte[] b)
         throws java.io.IOException

Overrides:

read in class java.io.InputStream

Throws:

java.io.IOException

reset

public void reset()
           throws java.io.IOException

Overrides:

reset in class java.io.InputStream

Throws:

java.io.IOException

skip

public long skip(long n)
          throws java.io.IOException

Overrides:

skip in class java.io.InputStream

Throws:

java.io.IOException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getHash

public java.lang.String getHash()

Returns the built SHA-512 hash Base64 encoded). The stream must be closed prior to calling this.

getHashBytes

public byte[] getHashBytes()

Returns the built SHA-512 hash bytes. The stream must be closed prior to calling this.