org.spongycastle.util

Class BigIntegers

java.lang.Object

org.spongycastle.util.BigIntegers

public final class BigIntegers
extends java.lang.Object

BigInteger utilities.

Constructor Summary

Constructors

Constructor and Description
BigIntegers()

Method Summary

Modifier and Type	Method and Description
static byte[]	asUnsignedByteArray(java.math.BigInteger value) Return the passed in value as an unsigned byte array.
static byte[]	asUnsignedByteArray(int length, java.math.BigInteger value) Return the passed in value as an unsigned byte array.
static java.math.BigInteger	createRandomInRange(java.math.BigInteger min, java.math.BigInteger max, java.security.SecureRandom random) Return a random BigInteger not less than 'min' and not greater than 'max'
static java.math.BigInteger	fromUnsignedByteArray(byte[] buf)
static java.math.BigInteger	fromUnsignedByteArray(byte[] buf, int off, int length)

Methods inherited from class java.lang.Object

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

Constructor Detail

BigIntegers

public BigIntegers()

Method Detail

asUnsignedByteArray

public static byte[] asUnsignedByteArray(java.math.BigInteger value)

Return the passed in value as an unsigned byte array.

Parameters:

value - value to be converted.

Returns:

a byte array without a leading zero byte if present in the signed encoding.

asUnsignedByteArray

public static byte[] asUnsignedByteArray(int length,
                                         java.math.BigInteger value)

Return the passed in value as an unsigned byte array.

Parameters:

value - value to be converted.

Returns:

a byte array without a leading zero byte if present in the signed encoding.

createRandomInRange

public static java.math.BigInteger createRandomInRange(java.math.BigInteger min,
                                                       java.math.BigInteger max,
                                                       java.security.SecureRandom random)

Return a random BigInteger not less than 'min' and not greater than 'max'

Parameters:

min - the least value that may be generated

max - the greatest value that may be generated

random - the source of randomness

Returns:

a random BigInteger value in the range [min,max]

fromUnsignedByteArray

public static java.math.BigInteger fromUnsignedByteArray(byte[] buf)

fromUnsignedByteArray

public static java.math.BigInteger fromUnsignedByteArray(byte[] buf,
                                                         int off,
                                                         int length)