diff --git a/Crypto/src/asn1/crmf/CertTemplateBuilder.cs b/Crypto/src/asn1/crmf/CertTemplateBuilder.cs
new file mode 100644
index 000000000..51c73c4e1
--- /dev/null
+++ b/Crypto/src/asn1/crmf/CertTemplateBuilder.cs
@@ -0,0 +1,125 @@
+using System;
+
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.Asn1.Crmf
+{
+ public class CertTemplateBuilder
+ {
+ private DerInteger version;
+ private DerInteger serialNumber;
+ private AlgorithmIdentifier signingAlg;
+ private X509Name issuer;
+ private OptionalValidity validity;
+ private X509Name subject;
+ private SubjectPublicKeyInfo publicKey;
+ private DerBitString issuerUID;
+ private DerBitString subjectUID;
+ private X509Extensions extensions;
+
+ /** Sets the X.509 version. Note: for X509v3, use 2 here. */
+ public virtual CertTemplateBuilder SetVersion(int ver)
+ {
+ version = new DerInteger(ver);
+ return this;
+ }
+
+ public virtual CertTemplateBuilder SetSerialNumber(DerInteger ser)
+ {
+ serialNumber = ser;
+ return this;
+ }
+
+ public virtual CertTemplateBuilder SetSigningAlg(AlgorithmIdentifier aid)
+ {
+ signingAlg = aid;
+ return this;
+ }
+
+ public virtual CertTemplateBuilder SetIssuer(X509Name name)
+ {
+ issuer = name;
+ return this;
+ }
+
+ public virtual CertTemplateBuilder SetValidity(OptionalValidity v)
+ {
+ validity = v;
+ return this;
+ }
+
+ public virtual CertTemplateBuilder SetSubject(X509Name name)
+ {
+ subject = name;
+ return this;
+ }
+
+ public virtual CertTemplateBuilder SetPublicKey(SubjectPublicKeyInfo spki)
+ {
+ publicKey = spki;
+ return this;
+ }
+
+ /** Sets the issuer unique ID (deprecated in X.509v3) */
+ public virtual CertTemplateBuilder SetIssuerUID(DerBitString uid)
+ {
+ issuerUID = uid;
+ return this;
+ }
+
+ /** Sets the subject unique ID (deprecated in X.509v3) */
+ public virtual CertTemplateBuilder SetSubjectUID(DerBitString uid)
+ {
+ subjectUID = uid;
+ return this;
+ }
+
+ public virtual CertTemplateBuilder SetExtensions(X509Extensions extens)
+ {
+ extensions = extens;
+ return this;
+ }
+
+ /**
+ * <pre>
+ * CertTemplate ::= SEQUENCE {
+ * version [0] Version OPTIONAL,
+ * serialNumber [1] INTEGER OPTIONAL,
+ * signingAlg [2] AlgorithmIdentifier OPTIONAL,
+ * issuer [3] Name OPTIONAL,
+ * validity [4] OptionalValidity OPTIONAL,
+ * subject [5] Name OPTIONAL,
+ * publicKey [6] SubjectPublicKeyInfo OPTIONAL,
+ * issuerUID [7] UniqueIdentifier OPTIONAL,
+ * subjectUID [8] UniqueIdentifier OPTIONAL,
+ * extensions [9] Extensions OPTIONAL }
+ * </pre>
+ * @return a basic ASN.1 object representation.
+ */
+ public virtual CertTemplate Build()
+ {
+ Asn1EncodableVector v = new Asn1EncodableVector();
+
+ AddOptional(v, 0, false, version);
+ AddOptional(v, 1, false, serialNumber);
+ AddOptional(v, 2, false, signingAlg);
+ AddOptional(v, 3, true, issuer); // CHOICE
+ AddOptional(v, 4, false, validity);
+ AddOptional(v, 5, true, subject); // CHOICE
+ AddOptional(v, 6, false, publicKey);
+ AddOptional(v, 7, false, issuerUID);
+ AddOptional(v, 8, false, subjectUID);
+ AddOptional(v, 9, false, extensions);
+
+ return CertTemplate.GetInstance(new DerSequence(v));
+ }
+
+ private void AddOptional(Asn1EncodableVector v, int tagNo, bool isExplicit, Asn1Encodable obj)
+ {
+ if (obj != null)
+ {
+ v.Add(new DerTaggedObject(isExplicit, tagNo, obj));
+ }
+ }
+ }
+}
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