SHA hash with HMAC256 kotlin

SHA hash with HMAC256 kotlin

    private fun generateHashWithHmac256(message: String): String? {
        try {
            val key = BuildConfig.HASH
            val bytes = hmac(key.toByteArray(), message.toByteArray())
            if (bytes != null) return bytesToHex(bytes)
        } catch (e: Exception) {
            e.printStackTrace()
        }
        return null
    }

    private fun hmac(key: ByteArray, message: ByteArray): ByteArray? {
        try {
            val mac = Mac.getInstance("HmacSHA256")
            mac.init(SecretKeySpec(key, "HmacSHA256"))
            return mac.doFinal(message)
        } catch (e: NoSuchAlgorithmException) {
            e.printStackTrace()
        } catch (e: InvalidKeyException) {
            e.printStackTrace()
        }
        return null
    }

    private fun bytesToHex(bytes: ByteArray): String {
        val result = bytes.joinToString(separator = "") { eachByte ->
            "%02x".format(eachByte)
        }
        return result
    }