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1static String generateHashKey (String apiKey, String msg) throws GeneralSecurityException{
2
3    Mac hmacSha256 = Mac.getInstance("HmacSHA256");
4    SecretKeySpec secretKey = new SecretKeySpec(apiKey.getBytes(), "HmacSHA256");
5    hmacSha256.init(secretKey);
6    byte[] bytes = hmacSha256.doFinal(msg.getBytes());
7
8    return Hex.encodeHexString(bytes).replace("-","");
9} 
10     
11import crypto from "crypto";
12...
13const eMessage = crypto.createHmac("SHA256", apiKey).update(message).digest("base64");