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