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lib
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python3
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dist-packages
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nacl
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hash.py
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# Copyright 2013 Donald Stufft and individual contributors # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. """ The :mod:`nacl.hash` module exposes one-shot interfaces for libsodium selected hash primitives and the constants needed for their usage. """ from __future__ import absolute_import, division, print_function import nacl.bindings import nacl.encoding BLAKE2B_BYTES = nacl.bindings.crypto_generichash_BYTES """Default digest size for :func:`blake2b` hash""" BLAKE2B_BYTES_MIN = nacl.bindings.crypto_generichash_BYTES_MIN """Minimum allowed digest size for :func:`blake2b` hash""" BLAKE2B_BYTES_MAX = nacl.bindings.crypto_generichash_BYTES_MAX """Maximum allowed digest size for :func:`blake2b` hash""" BLAKE2B_KEYBYTES = nacl.bindings.crypto_generichash_KEYBYTES """Default size of the ``key`` byte array for :func:`blake2b` hash""" BLAKE2B_KEYBYTES_MIN = nacl.bindings.crypto_generichash_KEYBYTES_MIN """Minimum allowed size of the ``key`` byte array for :func:`blake2b` hash""" BLAKE2B_KEYBYTES_MAX = nacl.bindings.crypto_generichash_KEYBYTES_MAX """Maximum allowed size of the ``key`` byte array for :func:`blake2b` hash""" BLAKE2B_SALTBYTES = nacl.bindings.crypto_generichash_SALTBYTES """Maximum allowed length of the ``salt`` byte array for :func:`blake2b` hash""" BLAKE2B_PERSONALBYTES = nacl.bindings.crypto_generichash_PERSONALBYTES """Maximum allowed length of the ``personalization`` byte array for :func:`blake2b` hash""" SIPHASH_BYTES = nacl.bindings.crypto_shorthash_siphash24_BYTES """Size of the :func:`siphash24` digest""" SIPHASH_KEYBYTES = nacl.bindings.crypto_shorthash_siphash24_KEYBYTES """Size of the secret ``key`` used by the :func:`siphash24` MAC""" SIPHASHX_BYTES = nacl.bindings.crypto_shorthash_siphashx24_BYTES """Size of the :func:`siphashx24` digest""" SIPHASHX_KEYBYTES = nacl.bindings.crypto_shorthash_siphashx24_KEYBYTES """Size of the secret ``key`` used by the :func:`siphashx24` MAC""" _b2b_hash = nacl.bindings.crypto_generichash_blake2b_salt_personal _sip_hash = nacl.bindings.crypto_shorthash_siphash24 _sip_hashx = nacl.bindings.crypto_shorthash_siphashx24 def sha256(message, encoder=nacl.encoding.HexEncoder): """ Hashes ``message`` with SHA256. :param message: The message to hash. :type message: bytes :param encoder: A class that is able to encode the hashed message. :returns: The hashed message. :rtype: bytes """ return encoder.encode(nacl.bindings.crypto_hash_sha256(message)) def sha512(message, encoder=nacl.encoding.HexEncoder): """ Hashes ``message`` with SHA512. :param message: The message to hash. :type message: bytes :param encoder: A class that is able to encode the hashed message. :returns: The hashed message. :rtype: bytes """ return encoder.encode(nacl.bindings.crypto_hash_sha512(message)) def blake2b(data, digest_size=BLAKE2B_BYTES, key=b'', salt=b'', person=b'', encoder=nacl.encoding.HexEncoder): """ Hashes ``data`` with blake2b. :param data: the digest input byte sequence :type data: bytes :param digest_size: the requested digest size; must be at most :const:`BLAKE2B_BYTES_MAX`; the default digest size is :const:`BLAKE2B_BYTES` :type digest_size: int :param key: the key to be set for keyed MAC/PRF usage; if set, the key must be at most :data:`~nacl.hash.BLAKE2B_KEYBYTES_MAX` long :type key: bytes :param salt: an initialization salt at most :const:`BLAKE2B_SALTBYTES` long; it will be zero-padded if needed :type salt: bytes :param person: a personalization string at most :const:`BLAKE2B_PERSONALBYTES` long; it will be zero-padded if needed :type person: bytes :param encoder: the encoder to use on returned digest :type encoder: class :returns: The hashed message. :rtype: bytes """ digest = _b2b_hash(data, digest_size=digest_size, key=key, salt=salt, person=person) return encoder.encode(digest) generichash = blake2b def siphash24(message, key=b'', encoder=nacl.encoding.HexEncoder): """ Computes a keyed MAC of ``message`` using the short-input-optimized siphash-2-4 construction. :param message: The message to hash. :type message: bytes :param key: the message authentication key for the siphash MAC construct :type key: bytes(:const:`SIPHASH_KEYBYTES`) :param encoder: A class that is able to encode the hashed message. :returns: The hashed message. :rtype: bytes(:const:`SIPHASH_BYTES`) """ digest = _sip_hash(message, key) return encoder.encode(digest) shorthash = siphash24 def siphashx24(message, key=b'', encoder=nacl.encoding.HexEncoder): """ Computes a keyed MAC of ``message`` using the 128 bit variant of the siphash-2-4 construction. :param message: The message to hash. :type message: bytes :param key: the message authentication key for the siphash MAC construct :type key: bytes(:const:`SIPHASHX_KEYBYTES`) :param encoder: A class that is able to encode the hashed message. :returns: The hashed message. :rtype: bytes(:const:`SIPHASHX_BYTES`) .. versionadded:: 1.2 """ digest = _sip_hashx(message, key) return encoder.encode(digest)