(Swift 3,4,5...) PKCS7 Sign Text using RSA 2048, SHA256, Base64 Output

Demonstrates how to sign text using 2048-bit RSA with SHA256, producing PKCS#7 output in Base64. The certificate w/ private key used for signing is loaded from a .p12/.pfx file.

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 cert = CkoCert()!

    // Load the cert and private key.  Whatever the private key happens to be,
    // such as RSA or ECC, then Chilkat will use it.  If the private key is 
    // a 2048-bit RSA key, then that's what will be used..
    var success: Bool = cert.loadPfxFile("qa_data/pfx/myCertAndKey.p12", password: "password")
    if success != true {
        print("\(cert.lastErrorText!)")
        return
    }

    let crypt = CkoCrypt2()!

    success = crypt.setSigning(cert)
    if success != true {
        print("\(crypt.lastErrorText!)")
        return
    }

    // Use SHA-256
    crypt.hashAlgorithm = "sha256"

    // Hash the utf-8 byte representation of the string
    crypt.charset = "utf-8"

    // Return the result in base64
    crypt.encodingMode = "base64"

    // Sign some text..
    var textToSign: String? = "This is the text to be hashed and signed."
    var sigBase64: String? = crypt.opaqueSignStringENC(textToSign)
    if crypt.lastMethodSuccess != true {
        print("\(crypt.lastErrorText!)")
        return
    }

    print("\(sigBase64!)")

    // The result:
    // MIIS2wYJKoZIhvcNAQc ... zGeeY4Oxg==

}