com.dalsemi.system
Class Security

java.lang.Object
  |
  +--com.dalsemi.system.Security

public class Security

extends java.lang.Object

A SHA-1 Hash and a "Better than Java" random number generator.

Method Summary

static int	getRandom() Return a 32 bit random number from the system random number generator.
static byte[]	hashMessage(byte[] MsgStr) Computes a SHA-1 hash on the given message.

Methods inherited from class java.lang.Object

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

Method Detail

getRandom

public static int getRandom()

Return a 32 bit random number from the system random number generator. This value is constructed from four calls into the system generator each which returns a byte. Each byte is the LSB of a 16 bit LFSR which is mixed using XOR with clock/timer values from throughout the sytem. This is definitely not cryptographically secure, but it's better than pure pseudo random.

Returns:

one 32 bit pseudorandom doubleplusgood number

hashMessage

public static byte[] hashMessage(byte[] MsgStr)

Computes a SHA-1 hash on the given message.
See FIPS 180-1 for more information on SHA-1.

Parameters:

message - the message to hash

Returns:

the result of the hash (20 bytes)