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using System;
using System.Collections;
using System.IO;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Math;
namespace Org.BouncyCastle.Asn1.Pkcs
{
public class PrivateKeyInfo
: Asn1Encodable
{
private readonly Asn1Object privKey;
private readonly AlgorithmIdentifier algID;
private readonly Asn1Set attributes;
public static PrivateKeyInfo GetInstance(
object obj)
{
if (obj is PrivateKeyInfo)
return (PrivateKeyInfo) obj;
if (obj != null)
return new PrivateKeyInfo(Asn1Sequence.GetInstance(obj));
return null;
}
public PrivateKeyInfo(
AlgorithmIdentifier algID,
Asn1Object privateKey)
: this(algID, privateKey, null)
{
}
public PrivateKeyInfo(
AlgorithmIdentifier algID,
Asn1Object privateKey,
Asn1Set attributes)
{
this.privKey = privateKey;
this.algID = algID;
this.attributes = attributes;
}
private PrivateKeyInfo(
Asn1Sequence seq)
{
IEnumerator e = seq.GetEnumerator();
e.MoveNext();
BigInteger version = ((DerInteger) e.Current).Value;
if (version.IntValue != 0)
{
throw new ArgumentException("wrong version for private key info: " + version.IntValue);
}
e.MoveNext();
algID = AlgorithmIdentifier.GetInstance(e.Current);
try
{
e.MoveNext();
Asn1OctetString data = (Asn1OctetString) e.Current;
privKey = Asn1Object.FromByteArray(data.GetOctets());
}
catch (IOException)
{
throw new ArgumentException("Error recoverying private key from sequence");
}
if (e.MoveNext())
{
attributes = Asn1Set.GetInstance((Asn1TaggedObject) e.Current, false);
}
}
public AlgorithmIdentifier AlgorithmID
{
get { return algID; }
}
public Asn1Object PrivateKey
{
get { return privKey; }
}
public Asn1Set Attributes
{
get { return attributes; }
}
/**
* write out an RSA private key with its associated information
* as described in Pkcs8.
* <pre>
* PrivateKeyInfo ::= Sequence {
* version Version,
* privateKeyAlgorithm AlgorithmIdentifier {{PrivateKeyAlgorithms}},
* privateKey PrivateKey,
* attributes [0] IMPLICIT Attributes OPTIONAL
* }
* Version ::= Integer {v1(0)} (v1,...)
*
* PrivateKey ::= OCTET STRING
*
* Attributes ::= Set OF Attr
* </pre>
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(
new DerInteger(0),
algID,
new DerOctetString(privKey));
if (attributes != null)
{
v.Add(new DerTaggedObject(false, 0, attributes));
}
return new DerSequence(v);
}
}
}
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