(C) Generate a CSR with SAN (Subject Alternative Name) Extension

Demonstrates how to generate a private key and a Certificate Signing Request (CSR) that includes the SAN extension.

Note: This example requires Chilkat v9.5.0.84 or greater.

Chilkat C/C++ Library Downloads
MS Visual C/C++ Linux/CentOS C/C++ Alpine Linux C/C++ MAC OS X C/C++	armhf/aarch64 C/C++ C++ Builder iOS C/C++ Android C/C++	Solaris C/C++ MinGW C/C++

#include <C_CkRsa.h>
#include <C_CkPrivateKey.h>
#include <C_CkCsr.h>
#include <C_CkFileAccess.h>

void ChilkatSample(void)
    {
    HCkRsa rsa;
    BOOL success;
    HCkPrivateKey privKey;
    HCkCsr csr;
    const char *pemStr;
    HCkFileAccess fac;

    // Note: Requires Chilkat v9.5.0.84 or greater.

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

    // First generate an RSA private key.
    // (It is also possible to create CSRs based on ECDSA private keys..)
    rsa = CkRsa_Create();

    // Generate a random 2048-bit RSA key.
    success = CkRsa_GenerateKey(rsa,2048);
    if (success != TRUE) {
        printf("%s\n",CkRsa_lastErrorText(rsa));
        CkRsa_Dispose(rsa);
        return;
    }

    // Get the private key
    privKey = CkRsa_ExportPrivateKeyObj(rsa);

    // Create the CSR object and set properties.
    csr = CkCsr_Create();

    // Specify the Common Name. 
    CkCsr_putCommonName(csr,"mysubdomain.mydomain.com");

    // Country Name (2 letter code)
    CkCsr_putCountry(csr,"GB");

    // State or Province Name (full name)
    CkCsr_putState(csr,"Yorks");

    // Locality Name (eg, city)
    CkCsr_putLocality(csr,"York");

    // Organization Name (eg, company)
    CkCsr_putCompany(csr,"Internet Widgits Pty Ltd");

    // Organizational Unit Name (eg, secion/division)
    CkCsr_putCompanyDivision(csr,"IT");

    // Email address
    CkCsr_putEmailAddress(csr,"support@mydomain.com");

    // Add Subject Alternative Names
    // (The AddSan method is added in Chilkat v9.5.0.84)
    // Call AddSan for each alternative name.
    success = CkCsr_AddSan(csr,"dnsName","mydomain.com");
    success = CkCsr_AddSan(csr,"dnsName","mysubdomain.mydomain.com");
    success = CkCsr_AddSan(csr,"ipAddress","192.168.0.123");

    // Create the CSR using the private key.
    pemStr = CkCsr_genCsrPem(csr,privKey);
    if (CkCsr_getLastMethodSuccess(csr) != TRUE) {
        printf("%s\n",CkCsr_lastErrorText(csr));
        CkPrivateKey_Dispose(privKey);
        CkRsa_Dispose(rsa);
        CkCsr_Dispose(csr);
        return;
    }

    // Save the private key and CSR to a files.
    CkPrivateKey_SavePkcs8EncryptedPemFile(privKey,"password","qa_output/privKey1.pem");
    CkPrivateKey_Dispose(privKey);

    fac = CkFileAccess_Create();
    CkFileAccess_WriteEntireTextFile(fac,"qa_output/csr1.pem",pemStr,"utf-8",FALSE);

    // Show the CSR.
    printf("%s\n",pemStr);

    // Sample output:

    // 	-----BEGIN CERTIFICATE REQUEST-----
    // 	MIIC6jCCAdICAQAwgaQxITAfBgNVBAMMGG15c3ViZG9tYWluLm15ZG9tYWluLmNv
    // 	bTELMAkGA1UEBhMCR0IxDjAMBgNVBAgMBVlvcmtzMQ0wCwYDVQQHDARZb3JrMSEw
    // 	HwYDVQQKDBhJbnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQxCzAJBgNVBAsMAklUMSMw
    // 	IQYJKoZIhvcNAQkBFhRzdXBwb3J0QG15ZG9tYWluLmNvbTCCASIwDQYJKoZIhvcN
    // 	AQEBBQADggEPADCCAQoCggEBALnQ0un/wF8whk+gPuiAlf3qvx14jgAOV6Erm6EB
    // 	H7WACPCpnKcm/8KP+7uoPiwRQaENhMeCgf45vcivl2p6aAn/spLXyEkXyw2d8wFb
    // 	YYAGRkiz4Xf7ASJiKuwcOtORz+sSDzgtdfokHfXU1cYeFE2yQhSdLUY5fMn425+g
    // 	KoEEsRSjSDe6AKru4+4iGNrLKd8pB9IA5/jOE139IkWlB9r5fEPD5bUTsgqXk9eb
    // 	68O0gc712V2eZK07N24lDmFC4bIMTD4csDWocR5hFHXj7NX7c8sOBDcpEb9mPIk4
    // 	elxubnhkfnjhOi4J3lDHcT/0ALnbLhf9LnaiKqs+5VcVZvECAwEAAaAAMA0GCSqG
    // 	SIb3DQEBBQUAA4IBAQC0AETLIcP3foh5nbu2hVFS8uCUNZ5hEIR1eXmYZmZoBQq2
    // 	26ZAoT4CZwixlggC+n7WvAXJ5Pzxpl4wLV4loTiQzaKPX1w0ERo5ZRwLy0n56oG2
    // 	6QG+WTViT1C8rlgtVwkCFNOXr0kSSRs8FdaPllqKxK1hxYSL7zwNpumsk39F2cDt
    // 	vhcekvH0V3BuGrQFm3dKN/0azW6GOod9+Vq4VzSyOe3kp15oxLBsZOFOu/REujcw
    // 	Tzu2jt1asQKUm60CZ9wNHpYepR0Ww40uP1slbehEaFDa6V8b60/tlHHmBbJ4/fy5
    // 	hJnYCvjzFz4O9VtT+JtP9ldRHWV3KpZ8ne3AjD+F
    // 	-----END CERTIFICATE REQUEST-----


    CkRsa_Dispose(rsa);
    CkCsr_Dispose(csr);
    CkFileAccess_Dispose(fac);

    }