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using System;
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 m_seq;
public static ECPrivateKeyStructure GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is ECPrivateKeyStructure ecPrivateKeyStructure)
return ecPrivateKeyStructure;
return new ECPrivateKeyStructure(Asn1Sequence.GetInstance(obj));
}
private ECPrivateKeyStructure(Asn1Sequence seq)
{
m_seq = seq ?? throw new ArgumentNullException(nameof(seq));
}
public ECPrivateKeyStructure(
int orderBitLength,
BigInteger key)
: this(orderBitLength, key, null)
{
}
public ECPrivateKeyStructure(
int orderBitLength,
BigInteger key,
Asn1Encodable parameters)
: this(orderBitLength, key, null, parameters)
{
}
public ECPrivateKeyStructure(
int orderBitLength,
BigInteger key,
DerBitString publicKey,
Asn1Encodable parameters)
{
if (key == null)
throw new ArgumentNullException(nameof(key));
if (orderBitLength < key.BitLength)
throw new ArgumentException("must be >= key bitlength", nameof(orderBitLength));
byte[] bytes = BigIntegers.AsUnsignedByteArray((orderBitLength + 7) / 8, key);
Asn1EncodableVector v = new Asn1EncodableVector(
new DerInteger(1),
new DerOctetString(bytes));
v.AddOptionalTagged(true, 0, parameters);
v.AddOptionalTagged(true, 1, publicKey);
m_seq = new DerSequence(v);
}
public virtual BigInteger GetKey()
{
Asn1OctetString octs = (Asn1OctetString)m_seq[1];
return new BigInteger(1, octs.GetOctets());
}
public virtual DerBitString GetPublicKey()
{
return (DerBitString)GetObjectInTag(1, Asn1Tags.BitString);
}
public virtual Asn1Object GetParameters()
{
return GetObjectInTag(0, -1);
}
private Asn1Object GetObjectInTag(int tagNo, int baseTagNo)
{
foreach (Asn1Encodable ae in m_seq)
{
Asn1Object obj = ae.ToAsn1Object();
if (obj is Asn1TaggedObject tag)
{
if (tag.HasContextTag(tagNo))
{
return baseTagNo < 0
? tag.GetExplicitBaseObject().ToAsn1Object()
: tag.GetBaseUniversal(true, baseTagNo);
}
}
}
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 m_seq;
}
}
}
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