(PowerShell) 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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Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# 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.
$ecc = New-Object Chilkat.Ecc
$prng = New-Object Chilkat.Prng

$privKey = $ecc.GenEccKey("secp256r1",$prng)
if ($ecc.LastMethodSuccess -eq $false) {
    $("Failed to generate a new ECDSA private key.")
    exit
}

$csr = New-Object Chilkat.Csr

# 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.

$xml = New-Object Chilkat.Xml
$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")
$xml.UpdateAttrAt("sequence|sequence[1]|asnOctets|sequence|contextSpecific",$true,"tag","4")
$xml.UpdateAttrAt("sequence|sequence[1]|asnOctets|sequence|contextSpecific",$true,"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
$csr.SetExtensionRequest($xml)

# Generate the CSR with the extension request
$csrPem = $csr.GenCsrPem($privKey)
if ($csr.LastMethodSuccess -eq $false) {
    $($csr.LastErrorText)

    exit
}

$($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-----