(Swift 3,4,5...) 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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func chilkatTest() {
    // 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.
    let ecc = CkoEcc()!
    let prng = CkoPrng()!

    var privKey: CkoPrivateKey? = ecc.genEccKey("secp256r1", prng: prng)
    if ecc.lastMethodSuccess == false {
        print("Failed to generate a new ECDSA private key.")
        return
    }

    let csr = CkoCsr()!

    // 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.

    let xml = CkoXml()!
    xml.tag = "set"
    xml.updateChildContent("sequence|sequence|oid", value: "1.3.6.1.4.1.311.20.2")
    xml.updateChildContent("sequence|sequence|asnOctets|printable", value: "ZATCA-Code-Signing")
    xml.updateChildContent("sequence|sequence[1]|oid", value: "2.5.29.17")
    xml.updateAttr(at: "sequence|sequence[1]|asnOctets|sequence|contextSpecific", autoCreate: true, attrName: "tag", attrValue: "4")
    xml.updateAttr(at: "sequence|sequence[1]|asnOctets|sequence|contextSpecific", autoCreate: true, attrName: "constructed", attrValue: "1")
    xml.updateChildContent("sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set|sequence|oid", value: "2.5.4.4")
    xml.updateChildContent("sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set|sequence|utf8", value: "334623324234325")
    xml.updateChildContent("sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[1]|sequence|oid", value: "0.9.2342.19200300.100.1.1")
    xml.updateChildContent("sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[1]|sequence|utf8", value: "310122393500003")
    xml.updateChildContent("sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[2]|sequence|oid", value: "2.5.4.12")
    xml.updateChildContent("sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[2]|sequence|utf8", value: "0000")
    xml.updateChildContent("sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[3]|sequence|oid", value: "2.5.4.26")
    xml.updateChildContent("sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[3]|sequence|utf8", value: "Sample E")
    xml.updateChildContent("sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[4]|sequence|oid", value: "2.5.4.15")
    xml.updateChildContent("sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[4]|sequence|utf8", value: "Sample Business")

    // Add the extension request to the CSR
    csr.setExtensionRequest(xml)

    // Generate the CSR with the extension request
    var csrPem: String? = csr.genCsrPem(privKey)
    if csr.lastMethodSuccess == false {
        print("\(csr.lastErrorText!)")
        privKey = nil
        return
    }

    print("\(csrPem!)")

    privKey = nil

    // 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-----

}