Package org.bouncycastle.asn1.x9

Class X9IntegerConverter

java.lang.Object

org.bouncycastle.asn1.x9.X9IntegerConverter

public class X9IntegerConverter
extends 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

Constructors

Constructor	Description
X9IntegerConverter()

Method Summary

Modifier and Type	Method	Description
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(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 Details

X9IntegerConverter

public X9IntegerConverter()

Method Details

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(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.