Fixed TypeError and added documentation

1 files changed, 21 insertions, 0 deletions

diff --git a/docs/hazmat/primitives/key-derivation-functions.rst b/docs/hazmat/primitives/key-derivation-functions.rst
index de6bf5f8..c9c0c3cc 100644
--- a/docs/hazmat/primitives/key-derivation-functions.rst
+++ b/docs/hazmat/primitives/key-derivation-functions.rst
@@ -88,6 +88,10 @@ Different KDFs are suitable for different tasks such as:
         provided ``backend`` does not implement
         :class:`~cryptography.hazmat.backends.interfaces.PBKDF2HMACBackend`
 
+    :raises TypeError: This exception is raised if ``salt`` is not a binary
+                       type. This is ``str`` in Python 2 and ``bytes`` in
+                       Python 3.
+
     .. method:: derive(key_material)
 
         :param bytes key_material: The input key material. For PBKDF2 this
@@ -99,6 +103,10 @@ Different KDFs are suitable for different tasks such as:
                                                           called more than
                                                           once.
 
+        :raises TypeError: This exception is raised if ``key_material`` is not
+                           a binary type. This is ``str`` in Python 2 and
+                           ``bytes`` in Python 3.
+
         This generates and returns a new key from the supplied password.
 
     .. method:: verify(key_material, expected_key)
@@ -191,10 +199,17 @@ Different KDFs are suitable for different tasks such as:
         provided ``backend`` does not implement
         :class:`~cryptography.hazmat.backends.interfaces.HMACBackend`
 
+    :raises TypeError: This exception is raised if ``salt`` or ``info`` is not
+                       a binary type. This is ``str`` in Python 2 and ``bytes``
+                       in Python 3.
+
     .. method:: derive(key_material)
 
         :param bytes key_material: The input key material.
         :return bytes: The derived key.
+        :raises TypeError: This exception is raised if ``key_material`` is not
+                           a binary type. This is ``str`` in Python 2 and
+                           ``bytes`` in Python 3.
 
         Derives a new key from the input key material by performing both the
         extract and expand operations.
@@ -277,6 +292,9 @@ Different KDFs are suitable for different tasks such as:
         provided ``backend`` does not implement
         :class:`~cryptography.hazmat.backends.interfaces.HMACBackend`
     :raises TypeError: This is raised if the provided ``info`` is a unicode object
+    :raises TypeError: This exception is raised if ``info`` is not a binary
+                       type. This is ``str`` in Python 2 and ``bytes`` in
+                       Python 3.
 
     .. method:: derive(key_material)
 
@@ -285,6 +303,9 @@ Different KDFs are suitable for different tasks such as:
 
         :raises TypeError: This is raised if the provided ``key_material`` is
             a unicode object
+        :raises TypeError: This exception is raised if ``key_material`` is not
+                           a binary type. This is ``str`` in Python 2 and
+                           ``bytes`` in Python 3.
 
         Derives a new key from the input key material by performing both the
         extract and expand operations.