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using System;
namespace Org.BouncyCastle.Asn1.X509
{
/**
* X.509 Section 9.8.2.
* <br/>
* This public-key certificate extension, when present, shall contain the subject’s alternative public key information
* <pre>
* subjectAltPublicKeyInfo EXTENSION ::= {
* SYNTAX SubjectAltPublicKeyInfo
* IDENTIFIED BY id-ce-subjectAltPublicKeyInfo }
*
* SubjectAltPublicKeyInfo ::= SEQUENCE {
* algorithm AlgorithmIdentifier{{SupportedAlgorithms}},
* subjectAltPublicKey BIT STRING }
* </pre>
* The SubjectAltPublicKeyInfo data type has the following components:
* <ul>
* <li>the algorithm subcomponent, which shall hold the algorithm that this public key is an instance of</li>
* <li>the subjectAltPublicKey subcomponent, which shall hold the alternative public key</li>
* </ul>
* This extension may be flagged as critical or as non-critical.
* <br/>
* NOTE – It is recommended that it be flagged as non-critical. Flagging it as critical would require relying parties to understand this
* extension and the alternative public-key algorithm.
*/
public class SubjectAltPublicKeyInfo
: Asn1Encodable
{
private readonly AlgorithmIdentifier m_algorithm;
private readonly DerBitString m_subjectAltPublicKey;
public static SubjectAltPublicKeyInfo GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is SubjectAltPublicKeyInfo subjectAltPublicKeyInfo)
return subjectAltPublicKeyInfo;
return new SubjectAltPublicKeyInfo(Asn1Sequence.GetInstance(obj));
}
public static SubjectAltPublicKeyInfo GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return GetInstance(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
}
public static SubjectAltPublicKeyInfo FromExtensions(X509Extensions extensions)
{
return GetInstance(
X509Extensions.GetExtensionParsedValue(extensions, X509Extensions.SubjectAltPublicKeyInfo));
}
private SubjectAltPublicKeyInfo(Asn1Sequence seq)
{
if (seq.Count != 2)
throw new ArgumentException("extension should contain only 2 elements");
m_algorithm = AlgorithmIdentifier.GetInstance(seq[0]);
m_subjectAltPublicKey = DerBitString.GetInstance(seq[1]);
}
public SubjectAltPublicKeyInfo(AlgorithmIdentifier algorithm, DerBitString subjectAltPublicKey)
{
m_algorithm = algorithm;
m_subjectAltPublicKey = subjectAltPublicKey;
}
public SubjectAltPublicKeyInfo(SubjectPublicKeyInfo subjectPublicKeyInfo)
{
m_algorithm = subjectPublicKeyInfo.AlgorithmID;
m_subjectAltPublicKey = subjectPublicKeyInfo.PublicKeyData;
}
public AlgorithmIdentifier Algorithm => Algorithm;
public DerBitString SubjectAltPublicKey => m_subjectAltPublicKey;
public override Asn1Object ToAsn1Object()
{
return new DerSequence(m_algorithm, m_subjectAltPublicKey);
}
}
}
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