Pkcs9ExtensionRequest.cs

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using System.Collections.Generic;
using System.Formats.Asn1;
using System.Security.Cryptography.Asn1;
 
namespace System.Security.Cryptography.X509Certificates;
 
internal sealed class Pkcs9ExtensionRequest : X501Attribute
{
    internal Pkcs9ExtensionRequest(IEnumerable<X509Extension> extensions)
        : base(System.Security.Cryptography.Oids.Pkcs9ExtensionRequestOid, EncodeAttribute(extensions))
    {
    }
 
    private static byte[] EncodeAttribute(IEnumerable<X509Extension> extensions)
    {
        if (extensions == null)
        {
            throw new ArgumentNullException("extensions");
        }
        AsnWriter asnWriter = new AsnWriter(AsnEncodingRules.DER);
        using (asnWriter.PushSequence())
        {
            foreach (X509Extension extension in extensions)
            {
                new X509ExtensionAsn(extension).Encode(asnWriter);
            }
        }
        return asnWriter.Encode();
    }
}