(Swift 3,4,5...) 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() {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let crypt = CkoCrypt2()!

    // 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"
    var success: Bool = 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!)")

}