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using System;
using System.Collections;
using System.IO;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Utilities.Collections;
namespace Org.BouncyCastle.Asn1.Pkcs
{
/**
* RFC 5958
*
* <pre>
* [IMPLICIT TAGS]
*
* OneAsymmetricKey ::= SEQUENCE {
* version Version,
* privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
* privateKey PrivateKey,
* attributes [0] Attributes OPTIONAL,
* ...,
* [[2: publicKey [1] PublicKey OPTIONAL ]],
* ...
* }
*
* PrivateKeyInfo ::= OneAsymmetricKey
*
* Version ::= INTEGER { v1(0), v2(1) } (v1, ..., v2)
*
* PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier
* { PUBLIC-KEY,
* { PrivateKeyAlgorithms } }
*
* PrivateKey ::= OCTET STRING
* -- Content varies based on type of key. The
* -- algorithm identifier dictates the format of
* -- the key.
*
* PublicKey ::= BIT STRING
* -- Content varies based on type of key. The
* -- algorithm identifier dictates the format of
* -- the key.
*
* Attributes ::= SET OF Attribute { { OneAsymmetricKeyAttributes } }
* </pre>
*/
public class PrivateKeyInfo
: Asn1Encodable
{
private readonly DerInteger version;
private readonly AlgorithmIdentifier privateKeyAlgorithm;
private readonly Asn1OctetString privateKey;
private readonly Asn1Set attributes;
private readonly DerBitString publicKey;
public static PrivateKeyInfo GetInstance(Asn1TaggedObject obj, bool explicitly)
{
return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
}
public static PrivateKeyInfo GetInstance(
object obj)
{
if (obj == null)
return null;
if (obj is PrivateKeyInfo)
return (PrivateKeyInfo)obj;
return new PrivateKeyInfo(Asn1Sequence.GetInstance(obj));
}
private static int GetVersionValue(DerInteger version)
{
BigInteger bigValue = version.Value;
if (bigValue.CompareTo(BigInteger.Zero) < 0 || bigValue.CompareTo(BigInteger.One) > 0)
throw new ArgumentException("invalid version for private key info", "version");
return bigValue.IntValue;
}
public PrivateKeyInfo(
AlgorithmIdentifier privateKeyAlgorithm,
Asn1Encodable privateKey)
: this(privateKeyAlgorithm, privateKey, null, null)
{
}
public PrivateKeyInfo(
AlgorithmIdentifier privateKeyAlgorithm,
Asn1Encodable privateKey,
Asn1Set attributes)
: this(privateKeyAlgorithm, privateKey, attributes, null)
{
}
public PrivateKeyInfo(
AlgorithmIdentifier privateKeyAlgorithm,
Asn1Encodable privateKey,
Asn1Set attributes,
byte[] publicKey)
{
this.version = new DerInteger(publicKey != null ? BigInteger.One : BigInteger.Zero);
this.privateKeyAlgorithm = privateKeyAlgorithm;
this.privateKey = new DerOctetString(privateKey);
this.attributes = attributes;
this.publicKey = publicKey == null ? null : new DerBitString(publicKey);
}
private PrivateKeyInfo(Asn1Sequence seq)
{
IEnumerator e = seq.GetEnumerator();
this.version = DerInteger.GetInstance(CollectionUtilities.RequireNext(e));
int versionValue = GetVersionValue(version);
this.privateKeyAlgorithm = AlgorithmIdentifier.GetInstance(CollectionUtilities.RequireNext(e));
this.privateKey = Asn1OctetString.GetInstance(CollectionUtilities.RequireNext(e));
int lastTag = -1;
while (e.MoveNext())
{
Asn1TaggedObject tagged = (Asn1TaggedObject)e.Current;
int tag = tagged.TagNo;
if (tag <= lastTag)
throw new ArgumentException("invalid optional field in private key info", "seq");
lastTag = tag;
switch (tag)
{
case 0:
{
this.attributes = Asn1Set.GetInstance(tagged, false);
break;
}
case 1:
{
if (versionValue < 1)
throw new ArgumentException("'publicKey' requires version v2(1) or later", "seq");
this.publicKey = DerBitString.GetInstance(tagged, false);
break;
}
default:
{
throw new ArgumentException("unknown optional field in private key info", "seq");
}
}
}
}
public virtual Asn1Set Attributes
{
get { return attributes; }
}
/// <summary>Return true if a public key is present, false otherwise.</summary>
public virtual bool HasPublicKey
{
get { return publicKey != null; }
}
public virtual AlgorithmIdentifier PrivateKeyAlgorithm
{
get { return privateKeyAlgorithm; }
}
public virtual Asn1Object ParsePrivateKey()
{
return Asn1Object.FromByteArray(privateKey.GetOctets());
}
/// <summary>For when the public key is an ASN.1 encoding.</summary>
public virtual Asn1Object ParsePublicKey()
{
return publicKey == null ? null : Asn1Object.FromByteArray(publicKey.GetOctets());
}
/// <summary>Return the public key as a raw bit string.</summary>
public virtual DerBitString PublicKeyData
{
get { return publicKey; }
}
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(version, privateKeyAlgorithm, privateKey);
if (attributes != null)
{
v.Add(new DerTaggedObject(false, 0, attributes));
}
if (publicKey != null)
{
v.Add(new DerTaggedObject(false, 1, publicKey));
}
return new DerSequence(v);
}
}
}
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