(Visual Basic 6.0) Generate a CSR containing an Extension Request

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Demonstrates how to generate a CSR containing a 1.2.840.113549.1.9.14 extensionRequest.

Note: This example requires Chilkat v9.5.0.91 or greater.

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' This requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

' This example will generate a secp256r1 ECDSA key for the CSR.
Dim ecc As New ChilkatEcc
Dim prng As New ChilkatPrng

Dim privKey As PrivateKey
Set privKey = ecc.GenEccKey("secp256r1",prng)
If (ecc.LastMethodSuccess = 0) Then
    Debug.Print "Failed to generate a new ECDSA private key."
    Exit Sub
End If

Dim csr As New ChilkatCsr

' Add common CSR fields:
csr.CommonName = "mysubdomain.mydomain.com"
csr.Country = "GB"
csr.State = "Yorks"
csr.Locality = "York"
csr.Company = "Internet Widgits Pty Ltd"
csr.EmailAddress = "support@mydomain.com"

' Add the following 1.2.840.113549.1.9.14 extensionRequest
' Note: The easiest way to know the content and format of the XML to be added is to examine
' a pre-existing CSR with the same desired extensionRequest.  You can use Chilkat to
' get the extensionRequest from an existing CSR. 

' 
' Here is a sample extension request:

' <?xml version="1.0" encoding="utf-8"?>
' <set>
'    <sequence>
'        <sequence>
'            <oid>1.3.6.1.4.1.311.20.2</oid>
'            <asnOctets>
'                <printable>ZATCA-Code-Signing</printable>
'            </asnOctets>
'        </sequence>
'        <sequence>
'            <oid>2.5.29.17</oid>
'            <asnOctets>
'                <sequence>
'                    <contextSpecific tag="4" constructed="1">
'                        <sequence>
'                            <set>
'                                <sequence>
'                                    <oid>2.5.4.4</oid>
'                                    <utf8>334623324234325</utf8>
'                                </sequence>
'                            </set>
'                            <set>
'                                <sequence>
'                                    <oid>0.9.2342.19200300.100.1.1</oid>
'                                    <utf8>310122393500003</utf8>
'                                </sequence>
'                            </set>
'                            <set>
'                                <sequence>
'                                    <oid>2.5.4.12</oid>
'                                    <utf8>0000</utf8>
'                                </sequence>
'                            </set>
'                            <set>
'                                <sequence>
'                                    <oid>2.5.4.26</oid>
'                                    <utf8>Sample E</utf8>
'                                </sequence>
'                            </set>
'                            <set>
'                                <sequence>
'                                    <oid>2.5.4.15</oid>
'                                    <utf8>Sample Business</utf8>
'                                </sequence>
'                            </set>
'                        </sequence>
'                    </contextSpecific>
'                </sequence>
'            </asnOctets>
'        </sequence>
'    </sequence>
' </set>

' Use this online tool to generate code from sample XML: 
' Generate Code to Create XML

' Here's the code to generate the above extension request.

Dim xml As New ChilkatXml
xml.Tag = "set"
xml.UpdateChildContent "sequence|sequence|oid","1.3.6.1.4.1.311.20.2"
xml.UpdateChildContent "sequence|sequence|asnOctets|printable","ZATCA-Code-Signing"
xml.UpdateChildContent "sequence|sequence[1]|oid","2.5.29.17"
success = xml.UpdateAttrAt("sequence|sequence[1]|asnOctets|sequence|contextSpecific",1,"tag","4")
success = xml.UpdateAttrAt("sequence|sequence[1]|asnOctets|sequence|contextSpecific",1,"constructed","1")
xml.UpdateChildContent "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set|sequence|oid","2.5.4.4"
xml.UpdateChildContent "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set|sequence|utf8","334623324234325"
xml.UpdateChildContent "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[1]|sequence|oid","0.9.2342.19200300.100.1.1"
xml.UpdateChildContent "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[1]|sequence|utf8","310122393500003"
xml.UpdateChildContent "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[2]|sequence|oid","2.5.4.12"
xml.UpdateChildContent "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[2]|sequence|utf8","0000"
xml.UpdateChildContent "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[3]|sequence|oid","2.5.4.26"
xml.UpdateChildContent "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[3]|sequence|utf8","Sample E"
xml.UpdateChildContent "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[4]|sequence|oid","2.5.4.15"
xml.UpdateChildContent "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[4]|sequence|utf8","Sample Business"

' Add the extension request to the CSR
success = csr.SetExtensionRequest(xml)

' Generate the CSR with the extension request
Dim csrPem As String
csrPem = csr.GenCsrPem(privKey)
If (csr.LastMethodSuccess = 0) Then
    Debug.Print csr.LastErrorText

    Exit Sub
End If

Debug.Print csrPem

' Sample PEM output:

' -----BEGIN CERTIFICATE REQUEST-----
' MIICEjCCAbkCAQAwgZcxITAfBgNVBAMMGG15c3ViZG9tYWluLm15ZG9tYWluLmNv
' bTELMAkGA1UEBhMCR0IxDjAMBgNVBAgMBVlvcmtzMQ0wCwYDVQQHDARZb3JrMSEw
' HwYDVQQKDBhJbnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQxIzAhBgkqhkiG9w0BCQEW
' FHN1cHBvcnRAbXlkb21haW4uY29tMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE
' g8EVNSV0ttlM9kG2E+J3ZB9WEDYVf2QA/8idrPRUafia1CHjd1kslwZA8eP2bAcf
' 2O493QAENqtW6DTHJbRz8KCBvjCBuwYJKoZIhvcNAQkOMYGtMIGqMCEGCSsGAQQB
' gjcUAgQUExJaQVRDQS1Db2RlLVNpZ25pbmcwgYQGA1UdEQR9MHukeTB3MRgwFgYD
' VQQEDA8zMzQ2MjMzMjQyMzQzMjUxHzAdBgoJkiaJk/IsZAEBDA8zMTAxMjIzOTM1
' MDAwMDMxDTALBgNVBAwMBDAwMDAxETAPBgNVBBoMCFNhbXBsZSBFMRgwFgYDVQQP
' DA9TYW1wbGUgQnVzaW5lc3MwCgYIKoZIzj0EAwIDRwAwRAIgF7D30eSBklfo+oel
' 1B0z64eJDB9MB3rCoiFZlj+mz0YCIHYI87eyqdtw2LOcAoBRhyxlBT6i28+Z/8t9
' bYsMIYvp
' -----END CERTIFICATE REQUEST-----