Java Version Sample Code

    /**
     * HMAC-SHA1 encryption scheme<br>
     * @param content-content to be encrypted
     * @param secretKey-key
     * @return HMAC_SHA1 encrypted character string
     */
    publicstatic String HMACSHA1(String content, String secretKey) {
        try {
            byte[] secretKeyBytes = secretKey.getBytes();
            SecretKey secretKeyObj = new SecretKeySpec(secretKeyBytes, "HmacSHA1");
            Mac mac = Mac.getInstance("HmacSHA1");
            mac.init(secretKeyObj);
            byte[] text = content.getBytes("UTF-8");
            byte[] encryptContentBytes = mac.doFinal(text);
            // length of signature obtained via SHA1 algorithm, all are 160-digit binary codes, which are converted to hexadecimal code character strings for representation.
            String encryptContent = bytesToHexString(encryptContentBytes);
            return encryptContent;  
        } catch (Exception e) {
            e.printStackTrace();
        }
        return content;
    }
    /**
     * form of expression of hexadecimal character string of byte array obtained<br>
     * Example: 0xff->'ff'
     * @param bytes byte array
     * @return string-form of expression of hexadecimal character string
     */
    privatestatic String bytesToHexString(byte[] bytes) {
        StringBuilder hexString = new StringBuilder("");
        for(byte ib : bytes) {
            char[] Digit = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
            char[] ob = newchar[2];
            ob[0] = Digit[(ib >>> 4) & 0X0f];
            ob[1] = Digit[ib & 0X0F];
            hexString.append(ob);
        }
        return hexString.toString();
     }