(Swift 3,4,5...) Load a PuTTY Public Key

Demonstrates how to load a PuTTY public key.

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func chilkatTest() {
    // Load a PuTTY public key.
    let puttyKey = CkoSshKey()!
    var pubKeyText: String? = puttyKey.loadText("qa_data/ppk/putty_public.pem")

    // The pubKeyText contains this content:

    // 	---- BEGIN SSH2 PUBLIC KEY ----
    // 	Comment: "rsa-key-20170126"
    // 	AAAAB3NzaC1yc2EAAAABJQAAAQEAx+52s7vvaZ8rT2UdFZWlSUVDHDQ+5ZRFvgRW
    // 	6nm2sO1c9WqNg7u2PQL4jeKSDX2XWcMnpleALz2x8Rr4rMy5E1iZzvWov8VtFd8l
    // 	fa9HOkgEeJB3VFuYR3NlnD3eyCoYJYPVpHJHrIeui2WZs5vQ76HDe+th8+z5Ald4
    // 	zPw3p2c6ZJpBrkSBM67hWokoBDi23c7NhszDHhJBrv+B98cQxnagI1PUKqN7E8Vg
    // 	bNtBI8beIMHyI69up9G1AXSEi0cGIjYNx9RNUPau1mRk/SvfqxgWkAjM005lj7hc
    // 	bOsjbdKK3T2NtrKTaYjEiXlEXcj1iGuApsD/m73pYaEJB3Nd7w==
    // 	---- END SSH2 PUBLIC KEY ----

    var success: Bool = puttyKey.fromRfc4716PublicKey(pubKeyText)
    if success != true {
        print("\(puttyKey.lastErrorText!)")
        return
    }

    // If desired, convert to other public key formats:
    var openSshPubKeyStr: String? = puttyKey.toOpenSshPublicKey()
    print("\(openSshPubKeyStr!)")

    // openSshPubKeyStr contains:
    // ssh-rsa AAAAB3NzaC1yc2EAAAABJQAAAQEAx+52s7vvaZ8rT2UdFZWlSUVDHDQ+5ZRFvgRW6nm2sO1c9WqNg7u2PQL4jeKSDX2XWcMnpleALz2x8Rr4rMy5E1iZzvWov8VtFd8lfa9HOkgEeJB3VFuYR3NlnD3eyCoYJYPVpHJHrIeui2WZs5vQ76HDe+th8+z5Ald4zPw3p2c6ZJpBrkSBM67hWokoBDi23c7NhszDHhJBrv+B98cQxnagI1PUKqN7E8VgbNtBI8beIMHyI69up9G1AXSEi0cGIjYNx9RNUPau1mRk/SvfqxgWkAjM005lj7hcbOsjbdKK3T2NtrKTaYjEiXlEXcj1iGuApsD/m73pYaEJB3Nd7w== rsa-key-20170126

    // Convert to an XML format:
    var xmlPubKeyStr: String? = puttyKey.toXml()
    print("\(xmlPubKeyStr!)")

    // xmlPubKeyStr contains:
    // <RSAPublicKey>
    //     <Modulus>x+52s7vvaZ8rT2UdFZWlSUVDHDQ+5ZRFvgRW6nm2sO1c9WqNg7u2PQL4jeKSDX2XWcMnpleALz2x8Rr4rMy5E1iZzvWov8VtFd8lfa9HOkgEeJB3VFuYR3NlnD3eyCoYJYPVpHJHrIeui2WZs5vQ76HDe+th8+z5Ald4zPw3p2c6ZJpBrkSBM67hWokoBDi23c7NhszDHhJBrv+B98cQxnagI1PUKqN7E8VgbNtBI8beIMHyI69up9G1AXSEi0cGIjYNx9RNUPau1mRk/SvfqxgWkAjM005lj7hcbOsjbdKK3T2NtrKTaYjEiXlEXcj1iGuApsD/m73pYaEJB3Nd7w==</Modulus>
    //     <Exponent>JQ==</Exponent>
    // </RSAPublicKey>
    // 
    // 

}