org.bouncycastle.asn1.x9
Class X9IntegerConverter

java.lang.Object
  |
  +--org.bouncycastle.asn1.x9.X9IntegerConverter

public class X9IntegerConverter

extends java.lang.Object

A class which converts integers to byte arrays, allowing padding and calculations to be done according the the filed size of the curve or field element involved.

Constructor Summary

X9IntegerConverter()

Method Summary

int	getByteLength(ECCurve c) Return the curve's field size in bytes.
int	getByteLength(ECFieldElement fe) Return the field element's field size in bytes.
byte[]	integerToBytes(java.math.BigInteger s, int qLength) Convert an integer to a byte array, ensuring it is exactly qLength long.

Methods inherited from class java.lang.Object

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

Constructor Detail

X9IntegerConverter

public X9IntegerConverter()

Method Detail

getByteLength

public int getByteLength(ECCurve c)

Return the curve's field size in bytes.

Parameters:

c - the curve of interest.

Returns:

the field size in bytes (rounded up).

getByteLength

public int getByteLength(ECFieldElement fe)

Return the field element's field size in bytes.

Parameters:

fe - the field element of interest.

Returns:

the field size in bytes (rounded up).

integerToBytes

public byte[] integerToBytes(java.math.BigInteger s,
                             int qLength)

Convert an integer to a byte array, ensuring it is exactly qLength long.

Parameters:

s - the integer to be converted.

qLength - the length

Returns:

the resulting byte array.