using System; using Org.BouncyCastle.Asn1; using Org.BouncyCastle.Math; using Org.BouncyCastle.Utilities; namespace Org.BouncyCastle.Asn1.Sec { /** * the elliptic curve private key object from SEC 1 */ public class ECPrivateKeyStructure : Asn1Encodable { private readonly Asn1Sequence seq; public static ECPrivateKeyStructure GetInstance(object obj) { if (obj == null) return null; if (obj is ECPrivateKeyStructure) return (ECPrivateKeyStructure)obj; return new ECPrivateKeyStructure(Asn1Sequence.GetInstance(obj)); } public ECPrivateKeyStructure( Asn1Sequence seq) { if (seq == null) throw new ArgumentNullException("seq"); this.seq = seq; } public ECPrivateKeyStructure( BigInteger key) { if (key == null) throw new ArgumentNullException("key"); this.seq = new DerSequence( new DerInteger(1), new DerOctetString(key.ToByteArrayUnsigned())); } public ECPrivateKeyStructure( BigInteger key, Asn1Encodable parameters) : this(key, null, parameters) { } public ECPrivateKeyStructure( BigInteger key, DerBitString publicKey, Asn1Encodable parameters) { if (key == null) throw new ArgumentNullException("key"); Asn1EncodableVector v = new Asn1EncodableVector( new DerInteger(1), new DerOctetString(key.ToByteArrayUnsigned())); if (parameters != null) { v.Add(new DerTaggedObject(true, 0, parameters)); } if (publicKey != null) { v.Add(new DerTaggedObject(true, 1, publicKey)); } this.seq = new DerSequence(v); } public virtual BigInteger GetKey() { Asn1OctetString octs = (Asn1OctetString) seq[1]; return new BigInteger(1, octs.GetOctets()); } public virtual DerBitString GetPublicKey() { return (DerBitString) GetObjectInTag(1); } public virtual Asn1Object GetParameters() { return GetObjectInTag(0); } private Asn1Object GetObjectInTag(int tagNo) { foreach (Asn1Encodable ae in seq) { Asn1Object obj = ae.ToAsn1Object(); if (obj is Asn1TaggedObject) { Asn1TaggedObject tag = (Asn1TaggedObject) obj; if (tag.TagNo == tagNo) { return tag.GetObject(); } } } return null; } /** * ECPrivateKey ::= SEQUENCE { * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1), * privateKey OCTET STRING, * parameters [0] Parameters OPTIONAL, * publicKey [1] BIT STRING OPTIONAL } */ public override Asn1Object ToAsn1Object() { return seq; } } }