org.bouncycastle.crypto.util

Class RadixConverter

java.lang.Object

org.bouncycastle.crypto.util.RadixConverter

public class RadixConverter
extends java.lang.Object

Utility class to convert decimal numbers (BigInteger) into a number in the base provided and the other way round.

For an application of this see the FPE parameter classes.

Constructor Summary

Constructors

Constructor and Description
RadixConverter(int radix)
RadixConverter(int radix, int numberOfCachedPowers)

Method Summary

Modifier and Type	Method and Description
java.math.BigInteger	fromEncoding(short[] digits)
int	getDigitsGroupLength()
int	getRadix()
void	toEncoding(java.math.BigInteger number, int messageLength, short[] out)

Methods inherited from class java.lang.Object

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

Constructor Detail

RadixConverter

public RadixConverter(int radix,
                      int numberOfCachedPowers)

Parameters:

radix - the radix to use for base conversions

numberOfCachedPowers - number of intermediate base powers to precompute and cache.

RadixConverter

public RadixConverter(int radix)

Parameters:

radix - the radix to use for base conversions.

Method Detail

getRadix

public int getRadix()

toEncoding

public void toEncoding(java.math.BigInteger number,
                       int messageLength,
                       short[] out)

fromEncoding

public java.math.BigInteger fromEncoding(short[] digits)

getDigitsGroupLength

public int getDigitsGroupLength()