private void EncodeIfDefined(DerEncoder DER, string OID, string Value)
{
if (Value != null)
{
DER.StartSET();
DER.StartSEQUENCE();
DER.OBJECT_IDENTIFIER(OID);
if (DerEncoder.IsPrintable(Value))
{
DER.PRINTABLE_STRING(Value);
}
else
{
DER.IA5_STRING(Value);
}
DER.EndSEQUENCE();
DER.EndSET();
}
}
/// <summary>
/// Building a Certificate Signing Request (CSR) in accordance with RFC 2986
/// </summary>
/// <returns>CSR</returns>
public byte[] BuildCSR()
{
DerEncoder DER = new DerEncoder();
DER.StartSEQUENCE(); // CertificationRequestInfo
DER.INTEGER(0); // Version
DER.StartSEQUENCE(); // subject
this.EncodeIfDefined(DER, "2.5.4.3", this.commonName);
this.EncodeIfDefined(DER, "2.5.4.4", this.surname);
this.EncodeIfDefined(DER, "2.5.4.5", this.serialNumber);
this.EncodeIfDefined(DER, "2.5.4.6", this.country);
this.EncodeIfDefined(DER, "2.5.4.7", this.locality);
this.EncodeIfDefined(DER, "2.5.4.8", this.stateOrProvince);
this.EncodeIfDefined(DER, "2.5.4.9", this.streetAddress);
this.EncodeIfDefined(DER, "2.5.4.10", this.organization);
this.EncodeIfDefined(DER, "2.5.4.11", this.organizationalUnit);
this.EncodeIfDefined(DER, "2.5.4.12", this.title);
this.EncodeIfDefined(DER, "2.5.4.13", this.description);
this.EncodeIfDefined(DER, "2.5.4.16", this.postalAddress);
this.EncodeIfDefined(DER, "2.5.4.17", this.postalCode);
this.EncodeIfDefined(DER, "2.5.4.18", this.postOfficeBox);
this.EncodeIfDefined(DER, "2.5.4.19", this.physicalDeliveryOfficeName);
this.EncodeIfDefined(DER, "2.5.4.20", this.telephoneNumber);
this.EncodeIfDefined(DER, "2.5.4.26", this.registeredAddress);
this.EncodeIfDefined(DER, "2.5.4.29", this.presentationAddress);
this.EncodeIfDefined(DER, "2.5.4.41", this.name);
this.EncodeIfDefined(DER, "2.5.4.42", this.givenName);
this.EncodeIfDefined(DER, "2.5.4.43", this.initials);
this.EncodeIfDefined(DER, "2.5.4.49", this.distinguishedName);
this.EncodeIfDefined(DER, "2.5.4.51", this.houseIdentifier);
this.EncodeIfDefined(DER, "1.2.840.113549.1.9.1", this.emailAddress);
DER.EndSEQUENCE(); // end of subject
DER.StartSEQUENCE(); // subjectPKInfo
DER.StartSEQUENCE(); // algorithm
DER.OBJECT_IDENTIFIER(this.signatureAlgorithm.PkiAlgorithmOID);
DER.NULL(); // No parameters
DER.EndSEQUENCE(); // end of algorithm
DER.StartBITSTRING(); // subjectPublicKey
this.signatureAlgorithm.ExportPublicKey(DER);
DER.EndBITSTRING(); // end of subjectPublicKey
DER.EndSEQUENCE(); // end of subjectPKInfo
DER.StartEndOfContent(Asn1TypeClass.ContextSpecific); // attributes
if (this.subjectAlternativeNames != null && this.subjectAlternativeNames.Length > 0)
{
DER.StartSEQUENCE();
DER.OBJECT_IDENTIFIER("1.2.840.113549.1.9.14"); // extensionRequest
DER.StartSET();
DER.StartSEQUENCE();
DER.StartSEQUENCE();
DER.OBJECT_IDENTIFIER("2.5.29.17");
DER.StartOCTET_STRING();
DER.StartSEQUENCE();
foreach (string s in this.subjectAlternativeNames)
{
int Pos = DER.Position;
DER.IA5_STRING(s);
DER[Pos] = 0x82; // Encoded as Context-specific INTEGER...
}
DER.EndSEQUENCE();
DER.EndOCTET_STRING();
DER.EndSEQUENCE();
DER.EndSEQUENCE();
DER.EndSET();
DER.EndSEQUENCE();
}
DER.EndEndOfContent(Asn1TypeClass.ContextSpecific); // end of attributes
DER.EndSEQUENCE(); // end of CertificationRequestInfo
byte[] CertificationRequestInfo = DER.ToArray();
DER.Clear();
DER.StartSEQUENCE(); // CertificationRequest
DER.Raw(CertificationRequestInfo);
DER.StartSEQUENCE(); // signatureAlgorithm
DER.OBJECT_IDENTIFIER(this.signatureAlgorithm.HashAlgorithmOID);
DER.NULL(); // parameters
DER.EndSEQUENCE(); // End of signatureAlgorithm
DER.BITSTRING(this.signatureAlgorithm.Sign(CertificationRequestInfo)); // signature
DER.EndSEQUENCE(); // end of CertificationRequest
return(DER.ToArray());
}