(Swift 3,4,5...) RSA Sign with PKCS8 Encrypted Key

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Demonstrates how to load a private key from an encrypted PKCS8 file and create an RSA digital signature.

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 pkey = CkoPrivateKey()!

    // Load the private key from an RSA PEM file:
    var success: Bool = pkey.loadPkcs8EncryptedFile("privateKey.key", password: "myPassword")

    var pkeyXml: String?
    // Get the private key in XML format:
    pkeyXml = pkey.getXml()

    let rsa = CkoRsa()!

    // Import the private key into the RSA object:
    success = rsa.importPrivateKey(pkeyXml)
    if success != true {
        print("\(rsa.lastErrorText!)")
        return
    }

    // Return the signature in hex
    rsa.encodingMode = "hex"

    var strData: String? = "This is the string to be signed."

    // Sign the string using the sha-1 hash algorithm.
    // Other valid choices are "md2", "sha256", "sha384", "sha512",  and "md5".
    var hexSig: String? = rsa.signStringENC(strData, hashAlg: "sha-1")

    print("\(hexSig!)")

}