.. _sha256:

sha256: SHA-256 Hashing Algorithm
=================================

This is the public domain implementation by Igor Pavlov.


Data Types
----------

.. c:type:: sha256_t

   Context for the SHA-256 hashing algorithm.


API
---

.. c:macro:: SHA256_DIGEST_LENGTH

   Size of a SHA-256 digest.

.. c:function:: void sha256_init(sha256_t *p)

   Initialize a SHA-256 context.

.. c:function:: void sha256_update(sha256_t *p, const uint8_t *data, size_t size)

   Update the SHA-256 hash.

.. c:function:: void sha256_final(sha256_t *p, uint8_t *digest)

   Finalize the SHA-256 hash clearing the shift registers, packing the result
   in buffer ``digest``.