use os.urandom()

CHANGES.txt

@@ -0,0 +1,12 @@
+
+
+Revision 1.0.0, released 4-May-2020
+-----------------------------------
+
+- Initial release.
+
+
+Revision 1.0.1, released 14-Jul-2020
+------------------------------------
+
+- Use os.urandom instead of secrets, which is not available until Python3.6.

pyhsslms/__init__.py

@@ -1,5 +1,5 @@
 # https://www.python.org/dev/peps/pep-0396/
-__version__ = '1.0.0'
+__version__ = '1.0.1'
 
 from .pyhsslms import lmots_sha256_n32_w1
 from .pyhsslms import lmots_sha256_n32_w2

pyhsslms/compat.py

@@ -57,15 +57,18 @@
     FoundFileError = IOError
 
 else:
-    from secrets import token_bytes as random_bytes
+    # secrets is not available until Python3.6.
+    # from secrets import token_bytes as random_bytes
+    import os
 
     u32 = lambda i: i.to_bytes(4, byteorder='big', signed=False)
     u16 = lambda i: i.to_bytes(2, byteorder='big', signed=False)
     u8 = lambda i: i.to_bytes(1, byteorder='big', signed=False)
     fromHex = bytes.fromhex
     toHex = lambda x: x.hex()
     toBytes = lambda x: x.encode()
-    randBytes = random_bytes
+    # randBytes = random_bytes
+    randBytes = os.urandom
     int32 = lambda x: int.from_bytes(x, byteorder='big')
     charNum = lambda x: x
     NoFileError = FileNotFoundError