move hash interfaces
diff --git a/docs/hazmat/primitives/cryptographic-hashes.rst b/docs/hazmat/primitives/cryptographic-hashes.rst
index c8b56eb..4928832 100644
--- a/docs/hazmat/primitives/cryptographic-hashes.rst
+++ b/docs/hazmat/primitives/cryptographic-hashes.rst
@@ -12,9 +12,9 @@
results (with a high probability) in different digests.
This is an implementation of
- :class:`~cryptography.hazmat.primitives.interfaces.HashContext` meant to
+ :class:`~cryptography.hazmat.primitives.hashes.HashContext` meant to
be used with
- :class:`~cryptography.hazmat.primitives.interfaces.HashAlgorithm`
+ :class:`~cryptography.hazmat.primitives.hashes.HashAlgorithm`
implementations to provide an incremental interface to calculating
various message digests.
@@ -39,7 +39,7 @@
`Lifetimes of cryptographic hash functions`_.
:param algorithm: A
- :class:`~cryptography.hazmat.primitives.interfaces.HashAlgorithm`
+ :class:`~cryptography.hazmat.primitives.hashes.HashAlgorithm`
provider such as those described in
:ref:`below <cryptographic-hash-algorithms>`.
:param backend: A
@@ -146,4 +146,48 @@
message digest and has practical known collision attacks.
+Interfaces
+~~~~~~~~~~
+
+.. class:: HashAlgorithm
+
+ .. attribute:: name
+
+ :type: str
+
+ The standard name for the hash algorithm, for example: ``"sha256"`` or
+ ``"whirlpool"``.
+
+ .. attribute:: digest_size
+
+ :type: int
+
+ The size of the resulting digest in bytes.
+
+ .. attribute:: block_size
+
+ :type: int
+
+ The internal block size of the hash algorithm in bytes.
+
+
+.. class:: HashContext
+
+ .. attribute:: algorithm
+
+ A :class:`HashAlgorithm` that will be used by this context.
+
+ .. method:: update(data)
+
+ :param bytes data: The data you want to hash.
+
+ .. method:: finalize()
+
+ :return: The final digest as bytes.
+
+ .. method:: copy()
+
+ :return: A :class:`HashContext` that is a copy of the current context.
+
+
.. _`Lifetimes of cryptographic hash functions`: http://valerieaurora.org/hash.html