Implement certificate information retrieval code in the ACME backends. (#736)

plugins/module_utils/crypto/math.py

@@ -110,6 +110,9 @@ if sys.version_info[0] >= 3:
     def _convert_int_to_bytes(count, no):
         return no.to_bytes(count, byteorder='big')
 
+    def _convert_bytes_to_int(data):
+        return int.from_bytes(data, byteorder='big', signed=False)
+
     def _to_hex(no):
         return hex(no)[2:]
 else:
@@ -122,6 +125,12 @@ else:
             raise Exception('Number {1} needs more than {0} bytes!'.format(count, n))
         return ('0' * (2 * count - len(h)) + h).decode('hex')
 
+    def _convert_bytes_to_int(data):
+        v = 0
+        for x in data:
+            v = (v << 8) | ord(x)
+        return v
+
     def _to_hex(no):
         return '%x' % no
 
@@ -155,3 +164,10 @@ def convert_int_to_hex(no, digits=None):
     if digits is not None and len(value) < digits:
         value = '0' * (digits - len(value)) + value
     return value
+
+
+def convert_bytes_to_int(data):
+    """
+    Convert a byte string to an unsigned integer in network byte order.
+    """
+    return _convert_bytes_to_int(data)