(Swift) HMAC Hex String

Demonstrates how to compute an HMAC using a hexidecimal key and data.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    let crypt = CkoCrypt2()

    var success: Bool = crypt.UnlockComponent("Anything for 30-day trial")
    if success != true {
        print("\(crypt.LastErrorText)")
        return
    }

    //  Set the MAC algorithm to HMAC
    crypt.MacAlgorithm = "hmac"

    //  Our HMAC key will be the bytes represented in the following hex string.
    //  In other words, the HMAC key is composed of the bytes 0x41, 0xC2, 0x1C, ...
    //  (It is not composed of the us-ascii string '4', '1', 'C', ...)
    var keyHex: String? = "41C21CB9D7A02FC5D4FADB9E4755B9DE"
    success = crypt.SetMacKeyEncoded(keyHex, encoding: "hex")

    //  Our desire is to HMAC the bytes represented in the following string:
    var dataHex: String? = "C22078065B01460001000000010062043BF5B18228C8E02D17BCFE4E00561FA6DEC216EA97195CEB579942E275C21932258E3CD391E507FF4E7FD4C787A8447DA111C54A9C1795E7FF4C0BAA2EDA"

    //  We'll need to decode the hex to binary:
    let bd = CkoBinData()
    bd.AppendEncoded(dataHex, encoding: "hex")

    //  Do the HMAC-SHA256 hash and return as a hex string:
    crypt.EncodingMode = "hex"
    crypt.HashAlgorithm = "sha-256"
    var macHex: String? = crypt.MacBdENC(bd)
    print("\(macHex!)")

}