(Tcl) 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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load ./chilkat.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.
set ecc [new_CkEcc]

set prng [new_CkPrng]

# privKey is a CkPrivateKey
set privKey [CkEcc_GenEccKey $ecc "secp256r1" $prng]
if {[CkEcc_get_LastMethodSuccess $ecc] == 0} then {
    puts "Failed to generate a new ECDSA private key."
    delete_CkEcc $ecc
    delete_CkPrng $prng
    exit
}

set csr [new_CkCsr]

# Add common CSR fields:
CkCsr_put_CommonName $csr "mysubdomain.mydomain.com"
CkCsr_put_Country $csr "GB"
CkCsr_put_State $csr "Yorks"
CkCsr_put_Locality $csr "York"
CkCsr_put_Company $csr "Internet Widgits Pty Ltd"
CkCsr_put_EmailAddress $csr "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.

set xml [new_CkXml]

CkXml_put_Tag $xml "set"
CkXml_UpdateChildContent $xml "sequence|sequence|oid" "1.3.6.1.4.1.311.20.2"
CkXml_UpdateChildContent $xml "sequence|sequence|asnOctets|printable" "ZATCA-Code-Signing"
CkXml_UpdateChildContent $xml "sequence|sequence[1]|oid" "2.5.29.17"
CkXml_UpdateAttrAt $xml "sequence|sequence[1]|asnOctets|sequence|contextSpecific" 1 "tag" "4"
CkXml_UpdateAttrAt $xml "sequence|sequence[1]|asnOctets|sequence|contextSpecific" 1 "constructed" "1"
CkXml_UpdateChildContent $xml "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set|sequence|oid" "2.5.4.4"
CkXml_UpdateChildContent $xml "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set|sequence|utf8" "334623324234325"
CkXml_UpdateChildContent $xml "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[1]|sequence|oid" "0.9.2342.19200300.100.1.1"
CkXml_UpdateChildContent $xml "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[1]|sequence|utf8" "310122393500003"
CkXml_UpdateChildContent $xml "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[2]|sequence|oid" "2.5.4.12"
CkXml_UpdateChildContent $xml "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[2]|sequence|utf8" "0000"
CkXml_UpdateChildContent $xml "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[3]|sequence|oid" "2.5.4.26"
CkXml_UpdateChildContent $xml "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[3]|sequence|utf8" "Sample E"
CkXml_UpdateChildContent $xml "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[4]|sequence|oid" "2.5.4.15"
CkXml_UpdateChildContent $xml "sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[4]|sequence|utf8" "Sample Business"

# Add the extension request to the CSR
CkCsr_SetExtensionRequest $csr $xml

# Generate the CSR with the extension request
set csrPem [CkCsr_genCsrPem $csr $privKey]
if {[CkCsr_get_LastMethodSuccess $csr] == 0} then {
    puts [CkCsr_lastErrorText $csr]
    delete_CkPrivateKey $privKey

    delete_CkEcc $ecc
    delete_CkPrng $prng
    delete_CkCsr $csr
    delete_CkXml $xml
    exit
}

puts "$csrPem"

delete_CkPrivateKey $privKey

# 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-----

delete_CkEcc $ecc
delete_CkPrng $prng
delete_CkCsr $csr
delete_CkXml $xml