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using System;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Digests;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Utilities.Encoders;
namespace Org.BouncyCastle.Asn1.X509
{
/**
* The AuthorityKeyIdentifier object.
* <pre>
* id-ce-authorityKeyIdentifier OBJECT IDENTIFIER ::= { id-ce 35 }
*
* AuthorityKeyIdentifier ::= Sequence {
* keyIdentifier [0] IMPLICIT KeyIdentifier OPTIONAL,
* authorityCertIssuer [1] IMPLICIT GeneralNames OPTIONAL,
* authorityCertSerialNumber [2] IMPLICIT CertificateSerialNumber OPTIONAL }
*
* KeyIdentifier ::= OCTET STRING
* </pre>
*
*/
public class AuthorityKeyIdentifier
: Asn1Encodable
{
public static AuthorityKeyIdentifier GetInstance(Asn1TaggedObject obj, bool explicitly)
{
return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
}
public static AuthorityKeyIdentifier GetInstance(object obj)
{
if (obj is AuthorityKeyIdentifier)
return (AuthorityKeyIdentifier)obj;
if (obj is X509Extension)
return GetInstance(X509Extension.ConvertValueToObject((X509Extension)obj));
if (obj == null)
return null;
return new AuthorityKeyIdentifier(Asn1Sequence.GetInstance(obj));
}
public static AuthorityKeyIdentifier FromExtensions(X509Extensions extensions)
{
return GetInstance(X509Extensions.GetExtensionParsedValue(extensions, X509Extensions.AuthorityKeyIdentifier));
}
private readonly Asn1OctetString keyidentifier;
private readonly GeneralNames certissuer;
private readonly DerInteger certserno;
protected internal AuthorityKeyIdentifier(
Asn1Sequence seq)
{
foreach (Asn1Encodable element in seq)
{
Asn1TaggedObject obj = Asn1TaggedObject.GetInstance(element);
switch (obj.TagNo)
{
case 0:
this.keyidentifier = Asn1OctetString.GetInstance(obj, false);
break;
case 1:
this.certissuer = GeneralNames.GetInstance(obj, false);
break;
case 2:
this.certserno = DerInteger.GetInstance(obj, false);
break;
default:
throw new ArgumentException("illegal tag");
}
}
}
/**
*
* Calulates the keyidentifier using a SHA1 hash over the BIT STRING
* from SubjectPublicKeyInfo as defined in RFC2459.
*
* Example of making a AuthorityKeyIdentifier:
* <pre>
* SubjectPublicKeyInfo apki = new SubjectPublicKeyInfo((ASN1Sequence)new ASN1InputStream(
* publicKey.getEncoded()).readObject());
* AuthorityKeyIdentifier aki = new AuthorityKeyIdentifier(apki);
* </pre>
*
**/
public AuthorityKeyIdentifier(
SubjectPublicKeyInfo spki)
: this(spki, null, null)
{
}
/**
* create an AuthorityKeyIdentifier with the GeneralNames tag and
* the serial number provided as well.
*/
public AuthorityKeyIdentifier(
SubjectPublicKeyInfo spki,
GeneralNames name,
BigInteger serialNumber)
{
IDigest digest = new Sha1Digest();
byte[] resBuf = new byte[digest.GetDigestSize()];
byte[] bytes = spki.PublicKeyData.GetBytes();
digest.BlockUpdate(bytes, 0, bytes.Length);
digest.DoFinal(resBuf, 0);
this.keyidentifier = new DerOctetString(resBuf);
this.certissuer = name;
this.certserno = serialNumber == null ? null : new DerInteger(serialNumber);
}
/**
* create an AuthorityKeyIdentifier with the GeneralNames tag and
* the serial number provided.
*/
public AuthorityKeyIdentifier(
GeneralNames name,
BigInteger serialNumber)
: this((byte[])null, name, serialNumber)
{
}
/**
* create an AuthorityKeyIdentifier with a precomputed key identifier
*/
public AuthorityKeyIdentifier(
byte[] keyIdentifier)
: this(keyIdentifier, null, null)
{
}
/**
* create an AuthorityKeyIdentifier with a precomupted key identifier
* and the GeneralNames tag and the serial number provided as well.
*/
public AuthorityKeyIdentifier(
byte[] keyIdentifier,
GeneralNames name,
BigInteger serialNumber)
{
this.keyidentifier = keyIdentifier == null ? null : new DerOctetString(keyIdentifier);
this.certissuer = name;
this.certserno = serialNumber == null ? null : new DerInteger(serialNumber);
}
public byte[] GetKeyIdentifier()
{
return keyidentifier == null ? null : keyidentifier.GetOctets();
}
public GeneralNames AuthorityCertIssuer
{
get { return certissuer; }
}
public BigInteger AuthorityCertSerialNumber
{
get { return certserno == null ? null : certserno.Value; }
}
/**
* Produce an object suitable for an Asn1OutputStream.
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(3);
v.AddOptionalTagged(false, 0, keyidentifier);
v.AddOptionalTagged(false, 1, certissuer);
v.AddOptionalTagged(false, 2, certserno);
return new DerSequence(v);
}
public override string ToString()
{
string keyID = (keyidentifier != null) ? Hex.ToHexString(keyidentifier.GetOctets()) : "null";
return "AuthorityKeyIdentifier: KeyID(" + keyID + ")";
}
}
}
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