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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
{
public static ECPrivateKeyStructure GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is ECPrivateKeyStructure ecPrivateKeyStructure)
return ecPrivateKeyStructure;
return new ECPrivateKeyStructure(Asn1Sequence.GetInstance(obj));
}
public static ECPrivateKeyStructure GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit) =>
new ECPrivateKeyStructure(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
public static ECPrivateKeyStructure GetTagged(Asn1TaggedObject taggedObject, bool declaredExplicit) =>
new ECPrivateKeyStructure(Asn1Sequence.GetTagged(taggedObject, declaredExplicit));
private readonly DerInteger m_version;
private readonly Asn1OctetString m_privateKey;
private readonly Asn1Encodable m_parameters;
private readonly DerBitString m_publicKey;
private ECPrivateKeyStructure(Asn1Sequence seq)
{
int count = seq.Count, pos = 0;
if (count < 2 || count > 4)
throw new ArgumentException("Bad sequence size: " + count, nameof(seq));
m_version = DerInteger.GetInstance(seq[pos++]);
m_privateKey = Asn1OctetString.GetInstance(seq[pos++]);
m_parameters = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 0, true,
(t, e) => t.GetExplicitBaseObject());
m_publicKey = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 1, true, DerBitString.GetTagged);
if (pos != count)
throw new ArgumentException("Unexpected elements in sequence", 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[] privateKeyContents = BigIntegers.AsUnsignedByteArray((orderBitLength + 7) / 8, key);
m_version = DerInteger.One;
m_privateKey = new DerOctetString(privateKeyContents);
m_parameters = parameters;
m_publicKey = publicKey;
}
public DerInteger Version => m_version;
public Asn1OctetString PrivateKey => m_privateKey;
public Asn1Encodable Parameters => m_parameters;
public DerBitString PublicKey => m_publicKey;
public virtual BigInteger GetKey() => BigIntegers.FromUnsignedByteArray(m_privateKey.GetOctets());
[Obsolete("Use 'PublicKey' instead")]
public virtual DerBitString GetPublicKey() => m_publicKey;
[Obsolete("Use 'Parameters' instead")]
public virtual Asn1Object GetParameters() => m_parameters?.ToAsn1Object();
/**
* ECPrivateKey ::= SEQUENCE {
* version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
* privateKey OCTET STRING,
* parameters [0] Parameters OPTIONAL,
* publicKey [1] BIT STRING OPTIONAL }
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(4);
v.Add(m_version, m_privateKey);
v.AddOptionalTagged(true, 0, m_parameters);
v.AddOptionalTagged(true, 1, m_publicKey);
return new DerSequence(v);
}
}
}
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