(Swift 3,4,5...) Convert Let's Encrypt PEM Files to a PFX

Demonstrates how to convert the .pem files provided by Let's Encrypt to a single PFX.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Let's Encrypt provides four .pem files
    // 1. fullchain.pem
    // 2. privkey.pem
    // 3. cert.pem
    // 4. chain.pem

    // The cert.pem and chain.pem are redundant. 
    // The fullchain.pem is composed of the cert.pem and chain.pem.

    // To convert the PEM's to a single .pfx, we don't need the redundant data.
    // The privkey.pem and fullchain.pem provide the required data.
    // We can ignore cert.pem and chain.pem (because those certs are already found in fullchain.pem).

    // We need a single .pem file that contains both the private key, the cert,
    // and the certs in the chain of authentication.
    // Let's combine priveky.pem and fullchain.pem into a single .pem

    let sbPem = CkoStringBuilder()!
    var success: Bool = sbPem.loadFile("qa_data/pem/lets_encrypt/privkey.pem", charset: "utf-8")
    if success == false {
        print("Failed to load privkey.pem")
        return
    }

    // To be safe, append a blank line..
    sbPem.appendLine("", crlf: false)

    let sbFullChainPem = CkoStringBuilder()!
    success = sbFullChainPem.loadFile("qa_data/pem/lets_encrypt/fullchain.pem", charset: "utf-8")
    if success == false {
        print("Failed to load fullchain.pem")
        return
    }

    // Append the full cert chain PEM to the private key PEM.
    sbPem.appendSb(sbFullChainPem)

    // Load the combined PEM into a Chilkat PFX object.
    let pfx = CkoPfx()!
    success = pfx.loadPem(sbPem.getAsString(), password: "no password required")
    if success == false {
        print("\(pfx.lastErrorText!)")
        return
    }

    // Write the PFX w/ a password.
    var pfxPassword: String? = "secret"
    success = pfx.toFile(pfxPassword, path: "qa_output/sample.pfx")
    if success == false {
        print("\(pfx.lastErrorText!)")
        return
    }

    print("Success!")

}