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Java Source Code / Java Documentation » Template Engine » ostermillerutils » com.Ostermiller.util

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Class Diagram

Java Document (Java Doc)

java.lang .Object

com.Ostermiller.util .MD5

MD5

public class MD5 (Code)

MD5 hash generator. More information about this class is available from ostermiller.org.

This class takes as input a message of arbitrary length and produces as output a 128-bit "fingerprint" or "message digest" of the input. 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.
See Also:   MD5OutputStream
See Also:   MD5InputStream
author:
   Santeri Paavolainen http://www.helsinki.fi/~sjpaavol/programs/md5/
author:
   Stephen Ostermiller http://ostermiller.org/contact.pl?regarding=Java+Utilities
since:
   ostermillerutils 1.00.00

Constructor Summary
public	MD5()

Method Summary
public byte[]	getHash() Gets this hash sum as an array of 16 bytes.
public static byte[]	getHash(byte[] b) Gets the MD5 hash of the given byte array. Parameters: b - byte array for which an MD5 hash is desired.
public static byte[]	getHash(InputStream in) Gets the MD5 hash the data on the given InputStream. Parameters: in - byte array for which an MD5 hash is desired.
public static byte[]	getHash(File f) Gets the MD5 hash of the given file. Parameters: f - file for which an MD5 hash is desired.
public static byte[]	getHash(String s) Gets the MD5 hash of the given String. The string is converted to bytes using the current platform's default character encoding. Parameters: s - String for which an MD5 hash is desired.
public static byte[]	getHash(String s, String enc) Gets the MD5 hash of the given String. Parameters: s - String for which an MD5 hash is desired. Parameters: enc - The name of a supported character encoding.
public String	getHashString() Returns 32-character hex representation of this hash.
public static String	getHashString(byte[] b) Gets the MD5 hash of the given byte array. Parameters: b - byte array for which an MD5 hash is desired.
public static String	getHashString(InputStream in) Gets the MD5 hash the data on the given InputStream. Parameters: in - byte array for which an MD5 hash is desired.
public static String	getHashString(File f) Gets the MD5 hash of the given file. Parameters: f - file array for which an MD5 hash is desired.
public static String	getHashString(String s) Gets the MD5 hash of the given String. The string is converted to bytes using the current platform's default character encoding. Parameters: s - String for which an MD5 hash is desired.
public static String	getHashString(String s, String enc) Gets the MD5 hash of the given String. Parameters: s - String for which an MD5 hash is desired. Parameters: enc - The name of a supported character encoding.
public static void	main(String[] args) Command line program that will take files as arguments and output the MD5 sum for each file.
public void	reset() Reset the MD5 sum to its initial state.
public String	toString() Returns 32-character hex representation of this hash.
public void	update(byte buffer, int offset, int length) Update this hash with the given data.
public void	update(byte buffer, int length) Update this hash with the given data.
public void	update(byte buffer) Update this hash with the given data.
public void	update(byte b) Updates this hash with a single byte.
public void	update(String s) Update this hash with a String.
public void	update(String s, String enc) Update this hash with a String.

Constructor Detail

MD5
public MD5()(Code)
	Class constructor since: ostermillerutils 1.00.00

Method Detail

getHash
public byte[] getHash()(Code)
	Gets this hash sum as an array of 16 bytes. Array of 16 bytes, the hash of all updated bytes. since: ostermillerutils 1.00.00

getHash
public static byte[] getHash(byte[] b)(Code)
	Gets the MD5 hash of the given byte array. Parameters: b - byte array for which an MD5 hash is desired. Array of 16 bytes, the hash of all updated bytes. since: ostermillerutils 1.00.00

getHash
public static byte[] getHash(InputStream in) throws IOException(Code)
	Gets the MD5 hash the data on the given InputStream. Parameters: in - byte array for which an MD5 hash is desired. Array of 16 bytes, the hash of all updated bytes. throws: IOException - if an I/O error occurs. since: ostermillerutils 1.00.00

getHash
public static byte[] getHash(File f) throws IOException(Code)
	Gets the MD5 hash of the given file. Parameters: f - file for which an MD5 hash is desired. Array of 16 bytes, the hash of all updated bytes. throws: IOException - if an I/O error occurs. since: ostermillerutils 1.00.00

getHash
public static byte[] getHash(String s)(Code)
	Gets the MD5 hash of the given String. The string is converted to bytes using the current platform's default character encoding. Parameters: s - String for which an MD5 hash is desired. Array of 16 bytes, the hash of all updated bytes. since: ostermillerutils 1.00.00

getHash
public static byte[] getHash(String s, String enc) throws UnsupportedEncodingException(Code)
	Gets the MD5 hash of the given String. Parameters: s - String for which an MD5 hash is desired. Parameters: enc - The name of a supported character encoding. Array of 16 bytes, the hash of all updated bytes. throws: UnsupportedEncodingException - If the named encoding is not supported. since: ostermillerutils 1.00.00

getHashString
public String getHashString()(Code)
	Returns 32-character hex representation of this hash. String representation of this object's hash. since: ostermillerutils 1.00.00

getHashString
public static String getHashString(byte[] b)(Code)
	Gets the MD5 hash of the given byte array. Parameters: b - byte array for which an MD5 hash is desired. 32-character hex representation the data's MD5 hash. since: ostermillerutils 1.00.00

getHashString
public static String getHashString(InputStream in) throws IOException(Code)
	Gets the MD5 hash the data on the given InputStream. Parameters: in - byte array for which an MD5 hash is desired. 32-character hex representation the data's MD5 hash. throws: IOException - if an I/O error occurs. since: ostermillerutils 1.00.00

getHashString
public static String getHashString(File f) throws IOException(Code)
	Gets the MD5 hash of the given file. Parameters: f - file array for which an MD5 hash is desired. 32-character hex representation the data's MD5 hash. throws: IOException - if an I/O error occurs. since: ostermillerutils 1.00.00

getHashString
public static String getHashString(String s)(Code)
	Gets the MD5 hash of the given String. The string is converted to bytes using the current platform's default character encoding. Parameters: s - String for which an MD5 hash is desired. 32-character hex representation the data's MD5 hash. since: ostermillerutils 1.00.00

getHashString
public static String getHashString(String s, String enc) throws UnsupportedEncodingException(Code)
	Gets the MD5 hash of the given String. Parameters: s - String for which an MD5 hash is desired. Parameters: enc - The name of a supported character encoding. 32-character hex representation the data's MD5 hash. throws: UnsupportedEncodingException - If the named encoding is not supported. since: ostermillerutils 1.00.00

main
public static void main(String[] args)(Code)
	Command line program that will take files as arguments and output the MD5 sum for each file. Parameters: args - command line arguments since: ostermillerutils 1.00.00

reset
public void reset()(Code)
	Reset the MD5 sum to its initial state. since: ostermillerutils 1.00.00

toString
public String toString()(Code)
	Returns 32-character hex representation of this hash. String representation of this object's hash. since: ostermillerutils 1.00.00

update
public void update(byte buffer, int offset, int length)(Code)
	Update this hash with the given data. If length bytes are not available to be hashed, as many bytes as possible will be hashed. Parameters: buffer - Array of bytes to be hashed. Parameters: offset - Offset to buffer array. Parameters: length - number of bytes to hash. since: ostermillerutils 1.00.00

update
public void update(byte buffer, int length)(Code)
	Update this hash with the given data. If length bytes are not available to be hashed, as many bytes as possible will be hashed. Parameters: buffer - Array of bytes to be hashed. Parameters: length - number of bytes to hash. since: ostermillerutils 1.00.00

update
public void update(byte buffer)(Code)
	Update this hash with the given data. Parameters: buffer - Array of bytes to be hashed. since: ostermillerutils 1.00.00

update
public void update(byte b)(Code)
	Updates this hash with a single byte. Parameters: b - byte to be hashed. since: ostermillerutils 1.00.00

update
public void update(String s)(Code)
	Update this hash with a String. The string is converted to bytes using the current platform's default character encoding. Parameters: s - String to be hashed. since: ostermillerutils 1.00.00

update
public void update(String s, String enc) throws UnsupportedEncodingException(Code)
	Update this hash with a String. Parameters: s - String to be hashed. Parameters: enc - The name of a supported character encoding. throws: UnsupportedEncodingException - If the named encoding is not supported. since: ostermillerutils 1.00.00

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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