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

RadixConverter(int radix)

RadixConverter(int radix, int numberOfCachedPowers)

Method Summary

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()