(Swift 3,4,5...) RSA Decrypt using PEM

This example demonstrates decryping RSA encrypted data that is base64 encoded. It uses a private key loaded from a PEM file.

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

    let rsa = CkoRsa()!

    let key = CkoPrivateKey()!

    // Load an RSA private key from an unencrypted PEM file:
    // (To load from an encrypted PEM file, call LoadEncryptedPemFile instead.)

    var success: Bool = key.loadPemFile("qa_data/rsa/decryptTest/priv.pem")
    if success != true {
        print("\(key.lastErrorText!)")
        return
    }

    // Make the key available to the RSA object
    success = rsa.importPrivateKeyObj(key)
    if success != true {
        print("\(rsa.lastErrorText!)")
        return
    }

    var encryptedStr: String? = "pP9XFJEsGgxPNHEgNiLB5H5ksCOXDk/G49BPTog1jKLAhYofV4UTH5k2TOYiqRnDnKs8+8uPoN/IxdiGXvuYG8HRzN0HtkhoZO/AxeyaB9S7eddCUlT0Pl2PEB2yQ9HG5rM7jqYOD6MAM4cuX7hqT8fa8tbzJzmBwdfFDBz94bwQjULHiO+gklIBC4vhkXT4yjuvEjxTAKU6tJeZYkBooJNdS/vE5RZRpuF6bGZU41Qc17qFR+iReBq+9f8IMmw8WR8fMbOCaygOfFS1nw7JVsIMGsAIXS8rUaJ/2DfGPfQx5HCiVtTOreGYRUI3esAQjnvUCnavZyQgs53nl7e2aA=="

    rsa.encodingMode = "base64"

    var usePrivateKey: Bool = true
    var decryptedStr: String? = rsa.decryptStringENC(encryptedStr, bUsePrivateKey: usePrivateKey)

    print("Decrypted:")
    print("\(decryptedStr!)")

}