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63 lines
2.1 KiB
Python
63 lines
2.1 KiB
Python
5 years ago
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# Copyright 2016 Donald Stufft and individual contributors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import absolute_import, division, print_function
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import nacl.exceptions as exc
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from nacl._sodium import ffi, lib
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from nacl.exceptions import ensure
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BYTES = lib.crypto_shorthash_siphash24_bytes()
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KEYBYTES = lib.crypto_shorthash_siphash24_keybytes()
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XBYTES = lib.crypto_shorthash_siphashx24_bytes()
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XKEYBYTES = lib.crypto_shorthash_siphashx24_keybytes()
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def crypto_shorthash_siphash24(data, key):
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"""Compute a fast, cryptographic quality, keyed hash of the input data
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:param data:
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:type data: bytes
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:param key: len(key) must be equal to
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:py:data:`.KEYBYTES` (16)
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:type key: bytes
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"""
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if len(key) != KEYBYTES:
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raise exc.ValueError(
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"Key length must be exactly {0} bytes".format(KEYBYTES))
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digest = ffi.new("unsigned char[]", BYTES)
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rc = lib.crypto_shorthash_siphash24(digest, data, len(data), key)
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ensure(rc == 0, raising=exc.RuntimeError)
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return ffi.buffer(digest, BYTES)[:]
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def crypto_shorthash_siphashx24(data, key):
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"""Compute a fast, cryptographic quality, keyed hash of the input data
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:param data:
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:type data: bytes
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:param key: len(key) must be equal to
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:py:data:`.XKEYBYTES` (16)
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:type key: bytes
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"""
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if len(key) != XKEYBYTES:
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raise exc.ValueError(
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"Key length must be exactly {0} bytes".format(XKEYBYTES))
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digest = ffi.new("unsigned char[]", XBYTES)
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rc = lib.crypto_shorthash_siphashx24(digest, data, len(data), key)
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ensure(rc == 0, raising=exc.RuntimeError)
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return ffi.buffer(digest, XBYTES)[:]
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