ostore.security
Class SafeBigInt

java.lang.Object
  |
  +--ostore.security.SafeBigInt

All Implemented Interfaces:

QuickSerializable

public class SafeBigInt

extends Object

implements QuickSerializable

BigInteger is broken in two respects for use with our cryptographic code; this class makes it hard to run into such problems.

Version:

$Id: SafeBigInt.java,v 1.10 2002/07/20 22:19:35 srhea Exp $

Author:

Sean C. Rhea

Constructor Summary

SafeBigInt(BigInteger bi)

SafeBigInt(byte[] val)
Don't construct negative numbers.

SafeBigInt(InputBuffer buffer)

SafeBigInt(int signum, byte[] magnitude)

SafeBigInt(int bitLength, int certainty, Random rnd)

SafeBigInt(int numBits, Random rnd)

SafeBigInt(String val)

SafeBigInt(String val, int radix)

Method Summary

SafeBigInt	add(SafeBigInt val)
int	bitLength()
int	compareTo(SafeBigInt val)
SafeBigInt	divide(SafeBigInt val)
boolean	equals(Object other)
SafeBigInt	gcd(SafeBigInt val)
int	intValue()
boolean	isProbablePrime(int certainty)
SafeBigInt	mod(SafeBigInt m)
SafeBigInt	modInverse(SafeBigInt m)
SafeBigInt	modPow(SafeBigInt exponent, SafeBigInt m)
SafeBigInt	multiply(SafeBigInt val)
void	serialize(OutputBuffer buffer) Add the object to the buffer.
SafeBigInt	shiftLeft(int n)
BigInteger	toBigInteger()
byte[]	toByteArray() Strips leading zeroes off super.toByteArray ().
String	toString()
String	toString(int radix)
static SafeBigInt	valueOf(long val)

Methods inherited from class java.lang.Object

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

Constructor Detail

SafeBigInt

public SafeBigInt(byte[] val)

Don't construct negative numbers.

SafeBigInt

public SafeBigInt(int signum,
                  byte[] magnitude)

SafeBigInt

public SafeBigInt(int bitLength,
                  int certainty,
                  Random rnd)

SafeBigInt

public SafeBigInt(int numBits,
                  Random rnd)

SafeBigInt

public SafeBigInt(String val)

SafeBigInt

public SafeBigInt(String val,
                  int radix)

SafeBigInt

public SafeBigInt(BigInteger bi)

SafeBigInt

public SafeBigInt(InputBuffer buffer)

Method Detail

serialize

public void serialize(OutputBuffer buffer)

Description copied from interface: QuickSerializable

Add the object to the buffer.

Specified by:

serialize in interface QuickSerializable

Parameters:

buffer - the output buffer to add the object to

add

public SafeBigInt add(SafeBigInt val)

multiply

public SafeBigInt multiply(SafeBigInt val)

modInverse

public SafeBigInt modInverse(SafeBigInt m)

isProbablePrime

public boolean isProbablePrime(int certainty)

compareTo

public int compareTo(SafeBigInt val)

bitLength

public int bitLength()

equals

public boolean equals(Object other)

Overrides:

equals in class Object

toBigInteger

public BigInteger toBigInteger()

mod

public SafeBigInt mod(SafeBigInt m)

gcd

public SafeBigInt gcd(SafeBigInt val)

divide

public SafeBigInt divide(SafeBigInt val)

shiftLeft

public SafeBigInt shiftLeft(int n)

modPow

public SafeBigInt modPow(SafeBigInt exponent,
                         SafeBigInt m)

intValue

public int intValue()

toString

public String toString()

Overrides:

toString in class Object

toString

public String toString(int radix)

toByteArray

public byte[] toByteArray()

Strips leading zeroes off super.toByteArray ().

valueOf

public static SafeBigInt valueOf(long val)