1 files changed, 30 insertions, 0 deletions
diff --git a/src/cryptography/hazmat/primitives/twofactor/utils.py b/src/cryptography/hazmat/primitives/twofactor/utils.py
new file mode 100644
index 00000000..91d2e148
--- /dev/null
+++ b/src/cryptography/hazmat/primitives/twofactor/utils.py
@@ -0,0 +1,30 @@
+# This file is dual licensed under the terms of the Apache License, Version
+# 2.0, and the BSD License. See the LICENSE file in the root of this repository
+# for complete details.
+
+from __future__ import absolute_import, division, print_function
+
+import base64
+
+from six.moves.urllib.parse import quote, urlencode
+
+
+def _generate_uri(hotp, type_name, account_name, issuer, extra_parameters):
+    parameters = [
+        ('digits', hotp._length),
+        ('secret', base64.b32encode(hotp._key)),
+        ('algorithm', hotp._algorithm.name.upper()),
+    ]
+
+    if issuer is not None:
+        parameters.append(('issuer', issuer))
+
+    parameters.extend(extra_parameters)
+
+    uriparts = {
+        'type': type_name,
+        'label': ('%s:%s' % (quote(issuer), quote(account_name)) if issuer
+                  else quote(account_name)),
+        'parameters': urlencode(parameters),
+    }
+    return 'otpauth://{type}/{label}?{parameters}'.format(**uriparts)