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Unified Diff: Doc/library/hashlib.rst

Issue 16113: Add SHA-3 (Keccak) support
Patch Set: Created 3 years, 7 months ago
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index f6d480897dea94823ee6babd42a7a49fbd0bdde2..fcdbabaa65dcdcb23cc1307409429e2e5c57ce5e 100644
--- a/Doc/library/hashlib.rst
+++ b/Doc/library/hashlib.rst
@@ -68,7 +68,13 @@ Constructors for hash algorithms that are always present in this module are
and :func:`sha512`. :func:`md5` is normally available as well, though it
may be missing if you are using a rare "FIPS compliant" build of Python.
Additional algorithms may also be available depending upon the OpenSSL
-library that Python uses on your platform.
+library that Python uses on your platform. On most platforms the
+:func:`sha3_224`, :func:`sha3_256`, :func:`sha3_384`, :func:`sha3_512`,
+:func:`shake_128`, :func:`shake_256` are also available.
+.. versionadded:: 3.6
+ SHA3 (Keccak) and SHAKE constructors :func:`sha3_224`, :func:`sha3_256`,
+ :func:`sha3_384`, :func:`sha3_512`, :func:`shake_128`, :func:`shake_256`.
For example, to obtain the digest of the byte string ``b'Nobody inspects the
spammish repetition'``::
@@ -185,6 +191,28 @@ A hash object has the following methods:
compute the digests of data sharing a common initial substring.
+SHAKE variable length digests
+The :func:`shake_128` and :func:`shake_256` algorithms provide variable
+length digests with length_in_bits//2 up to 128 or 256 bits of security.
+As such, their digest methods require a length. Maximum length is not limited
+by the SHAKE algorithm.
+.. method:: shake.digest(length)
+ Return the digest of the data passed to the :meth:`update` method so far.
+ This is a bytes object of size ``length`` which may contain bytes in
+ the whole range from 0 to 255.
+.. method:: shake.hexdigest(length)
+ Like :meth:`digest` except the digest is returned as a string object of
+ double length, containing only hexadecimal digits. This may be used to
+ exchange the value safely in email or other non-binary environments.
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