bc-csharp/crypto/src/x509/AttributeCertificateIssuer.cs at master · bcgit/bc-csharp · GitHub

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using System;

using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Utilities.Collections;

namespace Org.BouncyCastle.X509
{
    /// <summary>Carrying class for an attribute certificate issuer.</summary>
    public class AttributeCertificateIssuer
        : ISelector<X509Certificate>
    {
        internal readonly Asn1Encodable form;

        /// <summary>Set the issuer directly with the ASN.1 structure.</summary>
        public AttributeCertificateIssuer(AttCertIssuer issuer)
        {
            form = issuer.Issuer;
        }

        public AttributeCertificateIssuer(X509Name principal)
        {
            form = new V2Form(new GeneralNames(new GeneralName(principal)));
        }

        private object[] GetNames()
        {
            GeneralNames name;
            if (form is V2Form v2Form)
            {
                name = v2Form.IssuerName;
            }
            else
            {
                name = (GeneralNames)form;
            }

            GeneralName[] names = name.GetNames();

            int count = 0;
            for (int i = 0; i != names.Length; i++)
            {
                if (names[i].TagNo == GeneralName.DirectoryName)
                {
                    ++count;
                }
            }

            object[] result = new object[count];

            int pos = 0;
            for (int i = 0; i != names.Length; i++)
            {
                if (names[i].TagNo == GeneralName.DirectoryName)
                {
                    result[pos++] = X509Name.GetInstance(names[i].Name);
                }
            }

            return result;
        }

        /// <summary>Return any principal objects inside the attribute certificate issuer object.</summary>
        /// <returns>An array of IPrincipal objects (usually X509Principal).</returns>
        public X509Name[] GetPrincipals()
        {
            object[] p = this.GetNames();

            int count = 0;
            for (int i = 0; i != p.Length; i++)
            {
                if (p[i] is X509Name)
                {
                    ++count;
                }
            }

            X509Name[] result = new X509Name[count];

            int pos = 0;
            for (int i = 0; i != p.Length; i++)
            {
                if (p[i] is X509Name)
                {
                    result[pos++] = (X509Name)p[i];
                }
            }

            return result;
        }

        private bool MatchesDN(X509Name subject, GeneralNames targets)
        {
            GeneralName[] names = targets.GetNames();

            for (int i = 0; i != names.Length; i++)
            {
                GeneralName gn = names[i];

                if (gn.TagNo == GeneralName.DirectoryName)
                {
                    try
                    {
                        if (X509Name.GetInstance(gn.Name).Equivalent(subject))
                            return true;
                    }
                    catch (Exception)
                    {
                    }
                }
            }

            return false;
        }

        public object Clone() => new AttributeCertificateIssuer(AttCertIssuer.GetInstance(form));

        public bool Match(X509Certificate x509Cert)
        {
            if (x509Cert == null)
                return false;

            if (form is V2Form issuer)
            {
                if (issuer.BaseCertificateID != null)
                {
                    return issuer.BaseCertificateID.Serial.HasValue(x509Cert.SerialNumber)
                        && MatchesDN(x509Cert.IssuerDN, issuer.BaseCertificateID.Issuer);
                }

                return MatchesDN(x509Cert.SubjectDN, issuer.IssuerName);
            }

            return MatchesDN(x509Cert.SubjectDN, (GeneralNames)form);
        }

        public override bool Equals(object obj)
        {
            if (obj == this)
                return true;

            return obj is AttributeCertificateIssuer that
                && this.form.Equals(that.form);
        }

        public override int GetHashCode() => form.GetHashCode();
    }
}