(Go) Demonstrates the MacBytes Method

Demonstrates the MacBytes method to do HMAC-SHA256, HMAC-SHA1, and HMAC-MD5.

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    // This example assumes Chilkat Crypt2 to have been previously unlocked.
    // See Unlock Crypt2 for sample code.

    // Demonstrates how to reproduce the following results found at
    // https://en.wikipedia.org/wiki/Hash-based_message_authentication_code

    // HMAC_SHA256("key", "The quick brown fox jumps over the lazy dog") = 0xf7bc83f430538424b13298e6aa6fb143ef4d59a14946175997479dbc2d1a3cd8
    // HMAC_MD5("key", "The quick brown fox jumps over the lazy dog")    = 0x80070713463e7749b90c2dc24911e275
    // HMAC_SHA1("key", "The quick brown fox jumps over the lazy dog")   = 0xde7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9

    crypt := chilkat.NewCrypt2()

    crypt.SetMacAlgorithm("hmac")
    crypt.SetEncodingMode("hex")
    crypt.SetMacKeyString("key")
    sData := "The quick brown fox jumps over the lazy dog"

    // We're doing this in a convoluted, roundabout fashion to show syntax
    // and data types for handling binary data.
    // The straightforward way of doing an HMAC on a string is
    // shown here: HMAC String
    var dataToHmac []byte
    binData := chilkat.NewBinData()
    binData.AppendString(sData,"utf-8")
    dataToHmac = binData.GetBinary()

    var macBytes []byte

    crypt.SetHashAlgorithm("SHA-256")
    macBytes = crypt.MacBytes(dataToHmac)
    binData.Clear()
    binData.AppendBinary(macBytes)
    fmt.Println("HMAC_SHA256: ", *binData.GetEncoded("hex"))

    crypt.SetHashAlgorithm("MD5")
    macBytes = crypt.MacBytes(dataToHmac)
    binData.Clear()
    binData.AppendBinary(macBytes)
    fmt.Println("HMAC_MD5: ", *binData.GetEncoded("hex"))

    crypt.SetHashAlgorithm("SHA-1")
    macBytes = crypt.MacBytes(dataToHmac)
    binData.Clear()
    binData.AppendBinary(macBytes)
    fmt.Println("HMAC_SHA1: ", *binData.GetEncoded("hex"))

    // The output is the same (ignore case)
    // HMAC_SHA256: F7BC83F430538424B13298E6AA6FB143EF4D59A14946175997479DBC2D1A3CD8
    // HMAC_MD5: 80070713463E7749B90C2DC24911E275
    // HMAC_SHA1: DE7C9B85B8B78AA6BC8A7A36F70A90701C9DB4D9

    crypt.DisposeCrypt2()
    binData.DisposeBinData()