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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.
package org.bouncycastle.asn1.x9;
import java.math.BigInteger;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.math.ec.ECFieldElement;
/**
* class for processing an FieldElement as a DER object.
*/
public class X9FieldElement
extends ASN1Object
{
protected ECFieldElement f;
private static X9IntegerConverter converter = new X9IntegerConverter();
public X9FieldElement(ECFieldElement f)
{
this.f = f;
}
/**
* @deprecated Will be removed
*/
public X9FieldElement(BigInteger p, ASN1OctetString s)
{
this(new ECFieldElement.Fp(p, new BigInteger(1, s.getOctets())));
}
/**
* @deprecated Will be removed
*/
public X9FieldElement(int m, int k1, int k2, int k3, ASN1OctetString s)
{
this(new ECFieldElement.F2m(m, k1, k2, k3, new BigInteger(1, s.getOctets())));
}
public ECFieldElement getValue()
{
return f;
}
/**
* Produce an object suitable for an ASN1OutputStream.
*
* FieldElement ::= OCTET STRING
*
*
*
* - if q is an odd prime then the field element is
* processed as an Integer and converted to an octet string
* according to x 9.62 4.3.1.
* - if q is 2m then the bit string
* contained in the field element is converted into an octet
* string with the same ordering padded at the front if necessary.
*
*
*/
public ASN1Primitive toASN1Primitive()
{
int byteCount = converter.getByteLength(f);
byte[] paddedBigInteger = converter.integerToBytes(f.toBigInteger(), byteCount);
return new DEROctetString(paddedBigInteger);
}
}
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