demo.md
Class HMac

java.lang.Object
  |
  +--demo.md.HMac

public class HMac

extends Object

This class tests HMac implementation using MD5 as hash algorithm as specified in RFC 2104.

Version:

File Revision 18

Constructor Summary

HMac()
Default Constructor.

Method Summary

boolean	hmac(String algorithm, byte[] key, byte[] data, byte[] correct) Computes the HMAC on the given data using the given key, and compares the result with the given pre-computed correct value.
boolean	hmac(String algorithm, byte[] data, int keyLength) Repeatetly computes a HMAC on the given data and compares if the result is always the same.
boolean	hmacAll() Tests the HMAC algorithm for several hash algorithms.
boolean	hmacMd5() Tests the HMAC algorithm using Md5 for hash computation.
static void	main(String[] arg) Performs some tests for HMAC.
void	start() Tests the HMAC algorithm using Md5 for hash computation.

Methods inherited from class java.lang.Object

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

Constructor Detail

HMac

public HMac()

Default Constructor.

Method Detail

hmac

public boolean hmac(String algorithm,
                    byte[] key,
                    byte[] data,
                    byte[] correct)
             throws Exception

Computes the HMAC on the given data using the given key, and compares the result with the given pre-computed correct value.

Parameters:

algorithm - the HMAC algorithm to be used, e.g. "HMAC/MD5"

key - the key data to be used for generating a secret key necessary for MAC computation

data - the data on which the MAC shall be computed

correct - the pre-computed correct value for verifying the rseult of the MAC computation

Returns:

true if the MAC computation yields the correct result false otherwise

hmac

public boolean hmac(String algorithm,
                    byte[] data,
                    int keyLength)
             throws Exception

Repeatetly computes a HMAC on the given data and compares if the result is always the same.

Parameters:

algorithm - the HMAC algorithm to be used, e.g. "HMAC/MD5"

data - the data on which the MAC shall be computed

keyLength - the length of the key to be used

Returns:

true if the test succeeds, false otherwise

start

public void start()

Tests the HMAC algorithm using Md5 for hash computation.

Returns:

true if the test yields the correct result, false otherwise

hmacMd5

public boolean hmacMd5()
                throws Exception

Tests the HMAC algorithm using Md5 for hash computation.

Returns:

true if the test yields the correct result, false otherwise

hmacAll

public boolean hmacAll()
                throws Exception

Tests the HMAC algorithm for several hash algorithms.

Returns:

true if the test yields the correct result, false otherwise

main

public static void main(String[] arg)
                 throws IOException

Performs some tests for HMAC.