diff --git a/Crypto/src/asn1/isismtt/x509/ProcurationSyntax.cs b/Crypto/src/asn1/isismtt/x509/ProcurationSyntax.cs
new file mode 100644
index 000000000..a25df225e
--- /dev/null
+++ b/Crypto/src/asn1/isismtt/x509/ProcurationSyntax.cs
@@ -0,0 +1,232 @@
+using System;
+using System.Collections;
+
+using Org.BouncyCastle.Asn1.X500;
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.Asn1.IsisMtt.X509
+{
+ /**
+ * Attribute to indicate that the certificate holder may sign in the name of a
+ * third person.
+ * <p>
+ * ISIS-MTT PROFILE: The corresponding ProcurationSyntax contains either the
+ * name of the person who is represented (subcomponent thirdPerson) or a
+ * reference to his/her base certificate (in the component signingFor,
+ * subcomponent certRef), furthermore the optional components country and
+ * typeSubstitution to indicate the country whose laws apply, and respectively
+ * the type of procuration (e.g. manager, procuration, custody).
+ * </p>
+ * <p>
+ * ISIS-MTT PROFILE: The GeneralName MUST be of type directoryName and MAY only
+ * contain: - RFC3039 attributes, except pseudonym (countryName, commonName,
+ * surname, givenName, serialNumber, organizationName, organizationalUnitName,
+ * stateOrProvincename, localityName, postalAddress) and - SubjectDirectoryName
+ * attributes (title, dateOfBirth, placeOfBirth, gender, countryOfCitizenship,
+ * countryOfResidence and NameAtBirth).
+ * </p>
+ * <pre>
+ * ProcurationSyntax ::= SEQUENCE {
+ * country [1] EXPLICIT PrintableString(SIZE(2)) OPTIONAL,
+ * typeOfSubstitution [2] EXPLICIT DirectoryString (SIZE(1..128)) OPTIONAL,
+ * signingFor [3] EXPLICIT SigningFor
+ * }
+ *
+ * SigningFor ::= CHOICE
+ * {
+ * thirdPerson GeneralName,
+ * certRef IssuerSerial
+ * }
+ * </pre>
+ *
+ */
+ public class ProcurationSyntax
+ : Asn1Encodable
+ {
+ private readonly string country;
+ private readonly DirectoryString typeOfSubstitution;
+ private readonly GeneralName thirdPerson;
+ private readonly IssuerSerial certRef;
+
+ public static ProcurationSyntax GetInstance(
+ object obj)
+ {
+ if (obj == null || obj is ProcurationSyntax)
+ {
+ return (ProcurationSyntax) obj;
+ }
+
+ if (obj is Asn1Sequence)
+ {
+ return new ProcurationSyntax((Asn1Sequence) obj);
+ }
+
+ throw new ArgumentException("unknown object in factory: " + obj.GetType().Name, "obj");
+ }
+
+ /**
+ * Constructor from Asn1Sequence.
+ * <p/>
+ * The sequence is of type ProcurationSyntax:
+ * <p/>
+ * <pre>
+ * ProcurationSyntax ::= SEQUENCE {
+ * country [1] EXPLICIT PrintableString(SIZE(2)) OPTIONAL,
+ * typeOfSubstitution [2] EXPLICIT DirectoryString (SIZE(1..128)) OPTIONAL,
+ * signingFor [3] EXPLICIT SigningFor
+ * }
+ * <p/>
+ * SigningFor ::= CHOICE
+ * {
+ * thirdPerson GeneralName,
+ * certRef IssuerSerial
+ * }
+ * </pre>
+ *
+ * @param seq The ASN.1 sequence.
+ */
+ private ProcurationSyntax(
+ Asn1Sequence seq)
+ {
+ if (seq.Count < 1 || seq.Count > 3)
+ throw new ArgumentException("Bad sequence size: " + seq.Count);
+
+ IEnumerator e = seq.GetEnumerator();
+
+ while (e.MoveNext())
+ {
+ Asn1TaggedObject o = Asn1TaggedObject.GetInstance(e.Current);
+ switch (o.TagNo)
+ {
+ case 1:
+ country = DerPrintableString.GetInstance(o, true).GetString();
+ break;
+ case 2:
+ typeOfSubstitution = DirectoryString.GetInstance(o, true);
+ break;
+ case 3:
+ Asn1Object signingFor = o.GetObject();
+ if (signingFor is Asn1TaggedObject)
+ {
+ thirdPerson = GeneralName.GetInstance(signingFor);
+ }
+ else
+ {
+ certRef = IssuerSerial.GetInstance(signingFor);
+ }
+ break;
+ default:
+ throw new ArgumentException("Bad tag number: " + o.TagNo);
+ }
+ }
+ }
+
+ /**
+ * Constructor from a given details.
+ * <p/>
+ * <p/>
+ * Either <code>generalName</code> or <code>certRef</code> MUST be
+ * <code>null</code>.
+ *
+ * @param country The country code whose laws apply.
+ * @param typeOfSubstitution The type of procuration.
+ * @param certRef Reference to certificate of the person who is represented.
+ */
+ public ProcurationSyntax(
+ string country,
+ DirectoryString typeOfSubstitution,
+ IssuerSerial certRef)
+ {
+ this.country = country;
+ this.typeOfSubstitution = typeOfSubstitution;
+ this.thirdPerson = null;
+ this.certRef = certRef;
+ }
+
+ /**
+ * Constructor from a given details.
+ * <p/>
+ * <p/>
+ * Either <code>generalName</code> or <code>certRef</code> MUST be
+ * <code>null</code>.
+ *
+ * @param country The country code whose laws apply.
+ * @param typeOfSubstitution The type of procuration.
+ * @param thirdPerson The GeneralName of the person who is represented.
+ */
+ public ProcurationSyntax(
+ string country,
+ DirectoryString typeOfSubstitution,
+ GeneralName thirdPerson)
+ {
+ this.country = country;
+ this.typeOfSubstitution = typeOfSubstitution;
+ this.thirdPerson = thirdPerson;
+ this.certRef = null;
+ }
+
+ public virtual string Country
+ {
+ get { return country; }
+ }
+
+ public virtual DirectoryString TypeOfSubstitution
+ {
+ get { return typeOfSubstitution; }
+ }
+
+ public virtual GeneralName ThirdPerson
+ {
+ get { return thirdPerson; }
+ }
+
+ public virtual IssuerSerial CertRef
+ {
+ get { return certRef; }
+ }
+
+ /**
+ * Produce an object suitable for an Asn1OutputStream.
+ * <p/>
+ * Returns:
+ * <p/>
+ * <pre>
+ * ProcurationSyntax ::= SEQUENCE {
+ * country [1] EXPLICIT PrintableString(SIZE(2)) OPTIONAL,
+ * typeOfSubstitution [2] EXPLICIT DirectoryString (SIZE(1..128)) OPTIONAL,
+ * signingFor [3] EXPLICIT SigningFor
+ * }
+ * <p/>
+ * SigningFor ::= CHOICE
+ * {
+ * thirdPerson GeneralName,
+ * certRef IssuerSerial
+ * }
+ * </pre>
+ *
+ * @return an Asn1Object
+ */
+ public override Asn1Object ToAsn1Object()
+ {
+ Asn1EncodableVector vec = new Asn1EncodableVector();
+ if (country != null)
+ {
+ vec.Add(new DerTaggedObject(true, 1, new DerPrintableString(country, true)));
+ }
+ if (typeOfSubstitution != null)
+ {
+ vec.Add(new DerTaggedObject(true, 2, typeOfSubstitution));
+ }
+ if (thirdPerson != null)
+ {
+ vec.Add(new DerTaggedObject(true, 3, thirdPerson));
+ }
+ else
+ {
+ vec.Add(new DerTaggedObject(true, 3, certRef));
+ }
+
+ return new DerSequence(vec);
+ }
+ }
+}
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