(Swift 2) Create PKCS1 RSA Signature with PEM Private Key

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Demonstrates how to load a private key from a PEM file and create a PKCS1 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.LoadPemFile("pvkey2_rsa.pem")

    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
    }

    // Get the signature as 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", "md5", "sha256",
    // "sha384", and "sha512".
    var hexSig: String? = rsa.SignStringENC(strData, hashAlg: "sha-1")

    print("\(hexSig!)")

    print("Success!")

}