package org.bouncycastle.asn1.sec; import java.math.BigInteger; import org.bouncycastle.asn1.*; /** * the elliptic curve private key object from SEC 1 */ public class ECPrivateKeyStructure implements DEREncodable { 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); BigInteger k = new BigInteger(1, octs.getOctets()); return k; } public DERObject getDERObject() { return seq; } }