(Swift 3,4,5...) Duplicate OpensSSL to Create Signature using Cert and Key Files

This example duplicates the following:

openssl smime –sign -in something.xml -out something.der -signer mycert.crt -inkey cert.key -outform der –nodetach

Note: Although "smime" is the OpenSSL command, it's not actually producing S/MIME. The arguments "-outform der -binary" indicates that the output is binary DER (i.e. the PKCS7 binary signature). The input can be any type of file: XML, PDF, JPG, ... *anything*...

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

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

    let crypt = CkoCrypt2()!

    // Load the cert and private key from separate files.
    let cert = CkoCert()!
    var success: Bool = cert.load(fromFile: "myCert.crt")
    if success != true {
        print("\(cert.lastErrorText!)")
        return
    }

    let bd = CkoBinData()!
    success = bd.loadFile("cert.key")
    let privkey = CkoPrivateKey()!
    // Load from any format private key.
    // If the file does not need a password, the 2nd arg is ignored.
    success = privkey.loadAnyFormat(bd, password: "password_if_needed")
    if success != true {
        print("\(privkey.lastErrorText!)")
        return
    }

    success = crypt.setSigningCert2(cert, key: privkey)
    if success != true {
        print("\(crypt.lastErrorText!)")
        return
    }

    // Create the opaque signature (PKCS7 binary DER that contains both the signature and original file data).
    success = crypt.createP7M("qa_data/infile.anything", p7mPath: "qa_output/outfile.der")
    if success != true {
        print("\(crypt.lastErrorText!)")
        return
    }

    print("Success.")

}