Fix for environments where find_library always fails

Author: bryan-hunt

lib/atca_version.h

@@ -30,7 +30,7 @@
 #define _ATCA_VERSION_H
 
 // Version format yyyymmdd
-#define ATCA_LIBRARY_VERSION_DATE   "20210423"
+#define ATCA_LIBRARY_VERSION_DATE   "20210514"
 #define ATCA_LIBRARY_VERSION_MAJOR  3
 #define ATCA_LIBRARY_VERSION_MINOR  3
 #define ATCA_LIBRARY_VERSION_BUILD  1

python/cryptoauthlib/library.py

@@ -23,6 +23,7 @@
 
 import os.path
 import json
+import sys
 from ctypes import *
 from ctypes.util import find_library
 from .exceptions import LibraryLoadError
@@ -69,6 +70,21 @@ def __str__(self):
         return str(self.value)
 
 
+def _force_local_library():
+    """
+    In some environments loading seems to fail under all circumstances unless
+    brute forcing it.
+    """
+    curr_path = os.path.dirname(__file__)
+
+    if sys.platform.startswith('win'):
+        return os.path.join(curr_path, "cryptoauth.dll")
+    elif sys.platform.startswith('darwin'):
+        return os.path.join(curr_path, "libcryptoauth.dylib")
+    else:
+        return os.path.join(curr_path, "libcryptoauth.so")
+
+
 def load_cryptoauthlib(lib=None):
     """
     Load CryptoAauthLib into Python environment
@@ -80,7 +96,10 @@ def load_cryptoauthlib(lib=None):
     else:
         try:
             os.environ['PATH'] = os.path.dirname(__file__) + os.pathsep + os.environ['PATH']
-            _CRYPTO_LIB = cdll.LoadLibrary(find_library('cryptoauth'))
+            library_file = find_library('cryptoauth')
+            if library_file is None:
+                library_file = _force_local_library()
+            _CRYPTO_LIB = cdll.LoadLibrary(library_file)
         except:
             raise LibraryLoadError('Unable to find cryptoauthlib. You may need to reinstall')