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package org.bouncycastle.asn1.sec;
import java.math.BigInteger;
import java.util.Enumeration;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.util.BigIntegers;
/**
* the elliptic curve private key object from SEC 1
*/
public class ECPrivateKey
extends ASN1Object
{
private ASN1Sequence seq;
private ECPrivateKey(
ASN1Sequence seq)
{
this.seq = seq;
}
public static ECPrivateKey getInstance(
Object obj)
{
if (obj instanceof ECPrivateKey)
{
return (ECPrivateKey)obj;
}
if (obj != null)
{
return new ECPrivateKey(ASN1Sequence.getInstance(obj));
}
return null;
}
/**
* @deprecated use constructor which takes orderBitLength to guarantee correct encoding.
*/
public ECPrivateKey(
BigInteger key)
{
this(key.bitLength(), key);
}
/**
* Base constructor.
*
* @param orderBitLength the bitLength of the order of the curve.
* @param key the private key value.
*/
public ECPrivateKey(
int orderBitLength,
BigInteger key)
{
byte[] bytes = BigIntegers.asUnsignedByteArray((orderBitLength + 7) / 8, key);
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(new ASN1Integer(1));
v.add(new DEROctetString(bytes));
seq = new DERSequence(v);
}
/**
* @deprecated use constructor which takes orderBitLength to guarantee correct encoding.
*/
public ECPrivateKey(
BigInteger key,
ASN1Encodable parameters)
{
this(key, null, parameters);
}
/**
* @deprecated use constructor which takes orderBitLength to guarantee correct encoding.
*/
public ECPrivateKey(
BigInteger key,
DERBitString publicKey,
ASN1Encodable parameters)
{
this(key.bitLength(), key, publicKey, parameters);
}
public ECPrivateKey(
int orderBitLength,
BigInteger key,
ASN1Encodable parameters)
{
this(orderBitLength, key, null, parameters);
}
public ECPrivateKey(
int orderBitLength,
BigInteger key,
DERBitString publicKey,
ASN1Encodable parameters)
{
byte[] bytes = BigIntegers.asUnsignedByteArray((orderBitLength + 7) / 8, key);
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(new ASN1Integer(1));
v.add(new DEROctetString(bytes));
if (parameters != null)
{
v.add(new DERTaggedObject(true, 0, parameters));
}
if (publicKey != null)
{
v.add(new DERTaggedObject(true, 1, publicKey));
}
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 ASN1Primitive getParameters()
{
return getObjectInTag(0);
}
private ASN1Primitive getObjectInTag(int tagNo)
{
Enumeration e = seq.getObjects();
while (e.hasMoreElements())
{
ASN1Encodable obj = (ASN1Encodable)e.nextElement();
if (obj instanceof ASN1TaggedObject)
{
ASN1TaggedObject tag = (ASN1TaggedObject)obj;
if (tag.getTagNo() == tagNo)
{
return tag.getObject().toASN1Primitive();
}
}
}
return null;
}
/**
* ECPrivateKey ::= SEQUENCE {
* version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
* privateKey OCTET STRING,
* parameters [0] Parameters OPTIONAL,
* publicKey [1] BIT STRING OPTIONAL }
*/
public ASN1Primitive toASN1Primitive()
{
return seq;
}
}
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