diff --git a/scrypt_test.py b/scrypt_test.py
new file mode 100644
index 0000000..776dfc5
--- /dev/null
+++ b/scrypt_test.py
@@ -0,0 +1,140 @@
+#!/usr/bin/python3
+
+
+import binascii
+import getpass
+import time
+
+# pip3 install scrypt
+import scrypt as scrypt_locally_installed 
+
+from hashlib import scrypt as scrypt_from_hashlib
+
+#from Crypto.Protocol.KDF import scrypt as scrypt_from_Crypto
+
+from Cryptodome.Protocol.KDF import scrypt as scrypt_from_pyCryptodome
+
+from cryptography.hazmat.primitives.kdf import scrypt as scrypt_from_hazmat
+from cryptography.hazmat.backends import default_backend
+
+import importlib.util
+spec = importlib.util.spec_from_file_location("scrypt", "/usr/lib/python3/dist-packages/scrypt.py")
+scrypt_old = importlib.util.module_from_spec(spec)
+spec.loader.exec_module(scrypt_old)
+
+mypass = "password"
+
+mysalt = "salt"
+iterations = 1
+memory = 1048576
+#memory = 64*1024
+
+mypass = mypass.encode()
+mysalt = mysalt.encode()
+
+#print ("Version of scrypt:", scrypt.__version__)
+
+# ******************************************************************************************
+digest=mypass
+
+print ("**** Testing with Scrypt from scrypt...")
+print ("File of locally installed scrypt:", scrypt_locally_installed.__file__)
+
+# ******** Time **********
+start = time.time()
+
+for counter in range(iterations):
+    print ("Iteration %s from %s..." % (counter+1, iterations) )
+    digest = scrypt_locally_installed.hash(digest, mysalt, N = memory, r = 8, p = 1, buflen = 128)
+
+# ******** Time **********
+end = time.time()
+print ("*** Time: ", end - start, "**********************************************")
+print ("Digest in base64 format:", binascii.b2a_base64(digest).decode("utf-8"))
+
+print ("\n\n")
+# ******************************************************************************************
+digest=mypass
+
+print ("**** Testing with Scrypt from scrypt (old version)...")
+print ("File of scrypt:", scrypt_old.__file__)
+
+# ******** Time **********
+start = time.time()
+
+for counter in range(iterations):
+    print ("Iteration %s from %s..." % (counter+1, iterations) )
+    digest = scrypt_old.hash(digest, mysalt, N = memory, r = 8, p = 1, buflen = 128)
+
+# ******** Time **********
+end = time.time()
+print ("*** Time: ", end - start, "**********************************************")
+print ("Digest in base64 format:", binascii.b2a_base64(digest).decode("utf-8"))
+
+print ("\n\n")
+# ******************************************************************************************
+digest=mypass
+
+print ("**** Testing with Scrypt from Cryptodome...")
+# ******** Time **********
+start = time.time()
+
+for counter in range(iterations):
+    print ("Iteration %s from %s..." % (counter+1, iterations) )
+    digest = scrypt_from_pyCryptodome(digest, mysalt, key_len=128, N=memory, r=8, p=1)
+
+# ******** Time **********
+end = time.time()
+print ("*** Time: ", end - start, "**********************************************")
+print ("Digest in base64 format:", binascii.b2a_base64(digest).decode("utf-8"))
+
+print ("\n\n")
+# ******************************************************************************************
+
+
+# ******************************************************************************************
+digest=mypass
+
+print ("**** Testing with Scrypt from hashlib...")
+# ******** Time **********
+start = time.time()
+
+for counter in range(iterations):
+    print ("Iteration %s from %s..." % (counter+1, iterations) )
+    digest = scrypt_from_hashlib(password=digest, salt=mysalt, n=memory, r=8, p=1, maxmem=2147483646, dklen=128)
+
+#ValueError: maxmem must be positive and smaller than 2147483647
+
+# ******** Time **********
+end = time.time()
+print ("*** Time: ", end - start, "**********************************************")
+print ("Digest in base64 format:", binascii.b2a_base64(digest).decode("utf-8"))
+
+print ("\n\n")
+# ******************************************************************************************
+
+
+
+
+# ******************************************************************************************
+digest=mypass
+
+print ("**** Testing with Scrypt from hazmat...")
+# ******** Time **********
+start = time.time()
+
+for counter in range(iterations):
+    print ("Iteration %s from %s..." % (counter+1, iterations) )
+#   digest = scrypt_from_hashlib(password=digest, salt=mysalt, n=memory, r=8, p=1, maxmem=2147483646, dklen=128)
+    backend = default_backend()
+    kdf = scrypt_from_hazmat.Scrypt(salt=mysalt, length=128, n=memory, r=8, p=1, backend=backend)
+    digest = kdf.derive(digest)
+
+
+# ******** Time **********
+end = time.time()
+print ("*** Time: ", end - start, "**********************************************")
+print ("Digest in base64 format:", binascii.b2a_base64(digest).decode("utf-8"))
+
+print ("\n\n")
+# ******************************************************************************************