package org.bouncycastle.asn1.sec;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DEREncodable;
import org.bouncycastle.asn1.DERInteger;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import java.math.BigInteger;
import java.util.Enumeration;
/**
* the elliptic curve private key object from SEC 1
*/
public class ECPrivateKeyStructure
extends ASN1Encodable
{
private ASN1Sequence seq;
public ECPrivateKeyStructure(
ASN1Sequence seq)
{
this.seq = seq;
}
public ECPrivateKeyStructure(
BigInteger key)
{
byte[] bytes = key.toByteArray();
if (bytes[0] == 0)
{
byte[] tmp = new byte[bytes.length - 1];
System.arraycopy(bytes, 1, tmp, 0, tmp.length);
bytes = tmp;
}
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(new DERInteger(1));
v.add(new DEROctetString(bytes));
seq = new DERSequence(v);
}
public BigInteger getKey()
{
ASN1OctetString octs = (ASN1OctetString)seq.getObjectAt(1);
return new BigInteger(1, octs.getOctets());
}
public DERBitString getPublicKey()
{
return (DERBitString)getObjectInTag(1);
}
public ASN1Object getParameters()
{
return getObjectInTag(0);
}
private ASN1Object getObjectInTag(int tagNo)
{
Enumeration e = seq.getObjects();
while (e.hasMoreElements())
{
DEREncodable obj = (DEREncodable)e.nextElement();
if (obj instanceof ASN1TaggedObject)
{
ASN1TaggedObject tag = (ASN1TaggedObject)obj;
if (tag.getTagNo() == tagNo)
{
return (ASN1Object)((DEREncodable)tag.getObject()).getDERObject();
}
}
}
return null;
}
/**
* ECPrivateKey ::= SEQUENCE {
* version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
* privateKey OCTET STRING,
* parameters [0] Parameters OPTIONAL,
* publicKey [1] BIT STRING OPTIONAL }
*/
public DERObject toASN1Object()
{
return seq;
}
}