Method hmac

python/ccxt/base/exchange.py:1391–1398

(request, secret, algorithm=hashlib.sha256, digest='hex')

    @staticmethod
    def hmac(request, secret, algorithm=hashlib.sha256, digest='hex'):
        h = hmac.new(secret, request, algorithm)
        binary = h.digest()
        if digest == 'hex':
            return Exchange.binary_to_base16(binary)
        elif digest == 'base64':
            return Exchange.binary_to_base64(binary)
        return binary

    @staticmethod
    def string_to_binary(buff: str) -> bytes: