com.nimbusds.srp6

Class BigIntegerUtils

java.lang.Object

com.nimbusds.srp6.BigIntegerUtils

public class BigIntegerUtils
extends Object

Hexadecimal encoding and decoding utility.

Obtained from Apache Xerces and Aduna Software code on java2s.com.

Author:

Vladimir Dzhuvinov, John Kim, others

Method Summary

Modifier and Type	Method and Description
static BigInteger	bigIntegerFromBytes(byte[] bytes) Converts a byte array to a positive BigInteger
static byte[]	bigIntegerToBytes(BigInteger bigInteger) Converts a BigInteger into a byte array ignoring the sign of the BigInteger, according to RFC2945 specification
static BigInteger	fromHex(String hex) Decodes the specified hex string into a big integer.
static String	toHex(BigInteger bigint) Encodes the specified big integer into a hex string.

Methods inherited from class java.lang.Object

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

Method Detail

toHex

public static String toHex(BigInteger bigint)

Encodes the specified big integer into a hex string.

Parameters:

bigint - the value to convert to a hexidecimal string

Returns:

The resulting hex encoded string or null if the input is undefined.

fromHex

public static BigInteger fromHex(String hex)

Decodes the specified hex string into a big integer.

Parameters:

hex - The hex encoded string to decode.

Returns:

The resulting big integer or null if decoding failed.

bigIntegerFromBytes

public static BigInteger bigIntegerFromBytes(byte[] bytes)

Converts a byte array to a positive BigInteger

Parameters:

bytes - byte array in big endian unsigned RFC2945 format

Returns:

positive BigInteger containing the data of the supplied byte array

bigIntegerToBytes

public static byte[] bigIntegerToBytes(BigInteger bigInteger)

Converts a BigInteger into a byte array ignoring the sign of the BigInteger, according to RFC2945 specification

Parameters:

bigInteger - BigInteger, must not be null, should not be negative

Returns:

byte array (leading byte is always != 0), empty array if BigInteger is zero.