crypt: use the py3 builtin openssl

With Python 3.7+, the Python installer has the libcrypto and libssl dlls
in the DLLs Python folder, namely libcrypto-1_1.dll and libssl-1_1.dll,
which can be used directly.

Change-Id: I245c377dc8a9ec9a2e8548806bacd757bfdf27b6

cloudbaseinit/utils/crypt.py

@@ -26,12 +26,20 @@ if sys.platform == "win32":
     else:
         clib = ctypes.cdll.ucrtbase
 
-    # Note(mbivolan): The library name has changed in OpenSSL 1.1.0
-    # Keeping the old name for backward compatibility
-    try:
-        openssl = ctypes.cdll.libeay32
-    except Exception:
-        openssl = ctypes.cdll.libcrypto
+    # for backwards compatibility, try the older names
+    # libcrypto-1_1 comes bundled with PY 3.7 to 3.12
+    ssl_lib_names = [
+        "libcrypto-1_1",
+        "libcrypto",
+        "libeay32"
+    ]
+
+    for ssl_lib_name in ssl_lib_names:
+        try:
+            openssl = ctypes.CDLL(ssl_lib_name)
+            break
+        except Exception:
+            pass
 else:
     clib = ctypes.CDLL(clib_path)
     openssl_lib_path = ctypes.util.find_library("ssl")
@@ -64,6 +72,7 @@ class RSA(ctypes.Structure):
         ("mt_blinding", ctypes.c_void_p)
     ]
 
+
 openssl.RSA_PKCS1_PADDING = 1
 
 openssl.RSA_new.restype = ctypes.POINTER(RSA)