only import submodules if not hashlib

Author: brentru

adafruit_hashlib/__init__.py

@@ -42,17 +42,15 @@
 try:
     import hashlib
 except ImportError:
-    hashlib = None
+    from adafruit_hashlib._sha256 import sha224, sha256
+    from adafruit_hashlib._sha512 import sha384, sha512
 
 __version__ = "0.0.0-auto.0"
 __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_hashlib.git"
 
 # FIPS secure hash algorithms supported by this library
 ALGOS_AVAIL = ["sha1", "MD5", "sha224", "sha256", "sha384", "sha512"]
 
-from adafruit_hashlib._sha256 import sha224, sha256
-from adafruit_hashlib._sha512 import sha384, sha512
-
 def new(algo, data=b""):
     """Creates a new hashlib object.
     :param str algo: Name of the desired algorithm.

examples/hashlib_simpletest.py

@@ -11,8 +11,8 @@
 m.update(byte_string)
 # Obtain the digest, digest size, and block size
 print(
-    "Msg Digest: {}\nMsg Digest Size: {}\nMsg Block Size: {}".format(
-    m.hexdigest(), m.digest_size, m.block_size))
+        "Msg Digest: {}\nMsg Digest Size: {}\nMsg Block Size: {}".format(
+            m.hexdigest(), m.digest_size, m.block_size))
 # Validate the digest
 assert (
     m.hexdigest() == "744535a10879be6b18bbcdd135032891346f530a7845d580f7869f36"