(Go) Duplicate Java HMAC-SHA1 using Chilkat

This example uses Chilkat to produce the same results as this Java code:

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;

public void hmacSignatureExample() throws NoSuchAlgorithmException,
InvalidKeyException {

final String method = "POST";
final Long epoch = 1456765639015L; // Hardcoding for this example
final String uri = "/api/v5/policy/1234567890";
final String newline = "\n";

final String privateKey = "qwfvUeVRWAwyjlAzGivefFPTg+m6QtBPmDVv7Ra
/u7K3UuVVRhrZ/qc8EPh8IGJatuxsWD4EX+D9qE/eVvLTpw==";
final String publicKey = "16baedbe244b6c063968850716afb319a";

// Prepare the signature
final String plainText = method + newline + epoch + newline + uri + newline;

// Hash the plaintext with the private key
final byte[] keyBytes = privateKey.getBytes();
final Key key = new SecretKeySpec(keyBytes, 0, keyBytes.length, "HmacSHA1");
final Mac mac = Mac.getInstance("HmacSHA1");
mac.init(key);
String signatureHash = new String(Hex.encodeHex(mac.doFinal(plainText.
getBytes())));

// Prefix with public key
signatureHash = publicKey + ":" + signatureHash;

// Base64 encode to produce AUTHORIZATION
final String authorization = new String(Base64.encodeBase64(signatureHash.
getBytes()));
}

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    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var success bool

    // This is clearly in base64 encoding.
    privateKey := "qwfvUeVRWAwyjlAzGivefFPTg+m6QtBPmDVv7Ra/u7K3UuVVRhrZ/qc8EPh8IGJatuxsWD4EX+D9qE/eVvLTpw=="

    // This is clearly in the hex encoding.
    publicKey := "16baedbe244b6c063968850716afb319a"

    plainText := "POST\n1456765639015\n/api/v5/policy/1234567890\n"

    crypt := chilkat.NewCrypt2()

    // We want HMAC-SHA1.
    crypt.SetMacAlgorithm("HMAC")
    crypt.SetHashAlgorithm("SHA1")

    // The Java code (above) is literally using the us-ascii chars of the base64 string as the HMAC key.
    // (It is NOT using the base64 decoded bytes.)
    crypt.SetMacKeyEncoded(privateKey,"us-ascii")

    // We want our HMAC-SHA1 output to be a hex string.
    crypt.SetEncodingMode("hex_lower")

    hmacHex := crypt.MacStringENC(plainText)

    fmt.Println(*hmacHex)

    // The expected result is: dd3e8440f6b550f152156ea5e12d3e20b262adae

    sbSignatureHash := chilkat.NewStringBuilder()
    sbSignatureHash.Append(publicKey)
    sbSignatureHash.Append(":")
    sbSignatureHash.Append(*hmacHex)

    authorization := sbSignatureHash.GetEncoded("base64","utf-8")
    fmt.Println("Authorization: ", *authorization)

    // The expected result is:  MTZiYWVkYmUyNDRiNmMwNjM5Njg4NTA3MTZhZmIzMTlhOmRkM2U4NDQwZjZiNTUwZjE1MjE1NmVhNWUxMmQzZTIwYjI2MmFkYWU=

    crypt.DisposeCrypt2()
    sbSignatureHash.DisposeStringBuilder()