(Swift 2) HMAC SHA-1 Matching FIPS Examples

Provides an example of computing an HMAC-SHA1 digest to duplicate the FIPS examples at http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf

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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 crypt = CkoCrypt2()

    var strToSign: String? = "Sample #1"

    // 64-byte key
    var key: String? = "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f"

    // The expected result:
    // (from Appendix A.1 at http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf )
    var expectedResult: String? = "4f4ca3d5d68ba7cc0a1208c9c61e9c5da0403c0a"

    // Here is the code to duplicate the results:
    crypt.HashAlgorithm = "sha-1"
    crypt.EncodingMode = "hex"

    crypt.SetHmacKeyEncoded(key, encoding: "hex")

    var mac: String?
    mac = crypt.HmacStringENC(strToSign)

    print("Computed: \(mac!)")
    print("Expected: \(expectedResult!)")

}