(C) 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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#include <C_CkEcc.h>
#include <C_CkPrng.h>
#include <C_CkPrivateKey.h>
#include <C_CkCsr.h>
#include <C_CkXml.h>

void ChilkatSample(void)
    {
    HCkEcc ecc;
    HCkPrng prng;
    HCkPrivateKey privKey;
    HCkCsr csr;
    HCkXml xml;
    const char *csrPem;

    // 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 = CkEcc_Create();
    prng = CkPrng_Create();

    privKey = CkEcc_GenEccKey(ecc,"secp256r1",prng);
    if (CkEcc_getLastMethodSuccess(ecc) == FALSE) {
        printf("Failed to generate a new ECDSA private key.\n");
        CkEcc_Dispose(ecc);
        CkPrng_Dispose(prng);
        return;
    }

    csr = CkCsr_Create();

    // Add common CSR fields:
    CkCsr_putCommonName(csr,"mysubdomain.mydomain.com");
    CkCsr_putCountry(csr,"GB");
    CkCsr_putState(csr,"Yorks");
    CkCsr_putLocality(csr,"York");
    CkCsr_putCompany(csr,"Internet Widgits Pty Ltd");
    CkCsr_putEmailAddress(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.

    xml = CkXml_Create();
    CkXml_putTag(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",TRUE,"tag","4");
    CkXml_UpdateAttrAt(xml,"sequence|sequence[1]|asnOctets|sequence|contextSpecific",TRUE,"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
    csrPem = CkCsr_genCsrPem(csr,privKey);
    if (CkCsr_getLastMethodSuccess(csr) == FALSE) {
        printf("%s\n",CkCsr_lastErrorText(csr));
        CkPrivateKey_Dispose(privKey);
        CkEcc_Dispose(ecc);
        CkPrng_Dispose(prng);
        CkCsr_Dispose(csr);
        CkXml_Dispose(xml);
        return;
    }

    printf("%s\n",csrPem);

    CkPrivateKey_Dispose(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-----


    CkEcc_Dispose(ecc);
    CkPrng_Dispose(prng);
    CkCsr_Dispose(csr);
    CkXml_Dispose(xml);

    }