Python example of how to create a salt and use a secret key to generate a signature using the salt. This was tested with Python 3.6.8

salt_signature_36.py

import hmac
import os
import hashlib
import base64
import unittest

__author__ = 'drem'


class SecurityUtil(object):
    @staticmethod
    def generate_salt():
        salt = os.urandom(16)
        return str(base64.b64encode(salt))

    @staticmethod
    def generate_signature(salt, secret_key, encoding):
        secret_key_bytes = bytes(secret_key, encoding)
        salt_bytes = bytes(salt, encoding)
        dig = hmac.new(secret_key_bytes, salt_bytes, hashlib.sha256).digest()
        signature = base64.b64encode(dig)
        return signature


class TestSecurityUtil(unittest.TestCase):
    def test_generate_salt(self):
        salt = SecurityUtil.generate_salt()
        self.assertNotEqual(None, salt)
        print("Salt: " + salt)
        print()

    def test_generate_signature(self):
        salt = SecurityUtil.generate_salt()
        print("Salt: " + salt)
        signature = SecurityUtil.generate_signature(salt, "secretKey", "utf-8")
        self.assertNotEqual(None, signature)
        print("Signature: " + str(signature))
        print()

    def test_signatures_equal(self):
        salt = SecurityUtil.generate_salt()
        print("Salt: " + salt)
        signature1 = SecurityUtil.generate_signature(salt, "secretKey", "utf-8")
        self.assertNotEqual(None, signature1)
        print("Signature1: " + str(signature1))
        signature2 = SecurityUtil.generate_signature(salt, "secretKey", "utf-8")
        self.assertNotEqual(None, signature2)
        print("Signature2: " + str(signature2))
        print()
        self.assertEqual(signature1, signature2)


if __name__ == '__main__':
    unittest.main()

Python 2.7 version: https://gist.github.com/drem-darios/36c7a1e57e623d59919b9702fae0a1b9