mirror of
https://github.com/thegeeklab/ansible-later.git
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217 lines
7.8 KiB
Python
217 lines
7.8 KiB
Python
# Copyright 2013 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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from six import integer_types
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from nacl import 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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crypto_generichash_BYTES = lib.crypto_generichash_blake2b_bytes()
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crypto_generichash_BYTES_MIN = lib.crypto_generichash_blake2b_bytes_min()
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crypto_generichash_BYTES_MAX = lib.crypto_generichash_blake2b_bytes_max()
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crypto_generichash_KEYBYTES = lib.crypto_generichash_blake2b_keybytes()
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crypto_generichash_KEYBYTES_MIN = lib.crypto_generichash_blake2b_keybytes_min()
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crypto_generichash_KEYBYTES_MAX = lib.crypto_generichash_blake2b_keybytes_max()
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crypto_generichash_SALTBYTES = lib.crypto_generichash_blake2b_saltbytes()
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crypto_generichash_PERSONALBYTES = \
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lib.crypto_generichash_blake2b_personalbytes()
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crypto_generichash_STATEBYTES = lib.crypto_generichash_statebytes()
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_OVERLONG = '{0} length greater than {1} bytes'
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_TOOBIG = '{0} greater than {1}'
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def _checkparams(digest_size, key, salt, person):
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"""Check hash paramters"""
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ensure(isinstance(key, bytes),
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'Key must be a bytes sequence',
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raising=exc.TypeError)
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ensure(isinstance(salt, bytes),
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'Salt must be a bytes sequence',
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raising=exc.TypeError)
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ensure(isinstance(person, bytes),
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'Person must be a bytes sequence',
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raising=exc.TypeError)
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ensure(isinstance(digest_size, integer_types),
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'Digest size must be an integer number',
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raising=exc.TypeError)
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ensure(digest_size <= crypto_generichash_BYTES_MAX,
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_TOOBIG.format("Digest_size", crypto_generichash_BYTES_MAX),
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raising=exc.ValueError)
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ensure(len(key) <= crypto_generichash_KEYBYTES_MAX,
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_OVERLONG.format("Key", crypto_generichash_KEYBYTES_MAX),
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raising=exc.ValueError)
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ensure(len(salt) <= crypto_generichash_SALTBYTES,
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_OVERLONG.format("Salt", crypto_generichash_SALTBYTES),
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raising=exc.ValueError)
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ensure(len(person) <= crypto_generichash_PERSONALBYTES,
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_OVERLONG.format("Person", crypto_generichash_PERSONALBYTES),
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raising=exc.ValueError)
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def generichash_blake2b_salt_personal(data,
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digest_size=crypto_generichash_BYTES,
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key=b'', salt=b'', person=b''):
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"""One shot hash interface
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:param data: the input data to the hash function
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:param digest_size: must be at most
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:py:data:`.crypto_generichash_BYTES_MAX`;
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the default digest size is
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:py:data:`.crypto_generichash_BYTES`
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:type digest_size: int
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:param key: must be at most
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:py:data:`.crypto_generichash_KEYBYTES_MAX` long
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:type key: bytes
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:param salt: must be at most
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:py:data:`.crypto_generichash_SALTBYTES` long;
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will be zero-padded if needed
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:type salt: bytes
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:param person: must be at most
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:py:data:`.crypto_generichash_PERSONALBYTES` long:
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will be zero-padded if needed
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:type person: bytes
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:return: digest_size long digest
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:rtype: bytes
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"""
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_checkparams(digest_size, key, salt, person)
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ensure(isinstance(data, bytes),
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'Input data must be a bytes sequence',
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raising=exc.TypeError)
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digest = ffi.new("unsigned char[]", digest_size)
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# both _salt and _personal must be zero-padded to the correct length
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_salt = ffi.new("unsigned char []", crypto_generichash_SALTBYTES)
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_person = ffi.new("unsigned char []", crypto_generichash_PERSONALBYTES)
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ffi.memmove(_salt, salt, len(salt))
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ffi.memmove(_person, person, len(person))
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rc = lib.crypto_generichash_blake2b_salt_personal(digest, digest_size,
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data, len(data),
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key, len(key),
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_salt, _person)
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ensure(rc == 0, 'Unexpected failure',
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raising=exc.RuntimeError)
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return ffi.buffer(digest, digest_size)[:]
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def generichash_blake2b_init(key=b'', salt=b'',
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person=b'',
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digest_size=crypto_generichash_BYTES):
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"""
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Create a new initialized blake2b hash state
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:param key: must be at most
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:py:data:`.crypto_generichash_KEYBYTES_MAX` long
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:type key: bytes
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:param salt: must be at most
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:py:data:`.crypto_generichash_SALTBYTES` long;
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will be zero-padded if needed
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:type salt: bytes
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:param person: must be at most
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:py:data:`.crypto_generichash_PERSONALBYTES` long:
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will be zero-padded if needed
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:type person: bytes
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:param digest_size: must be at most
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:py:data:`.crypto_generichash_BYTES_MAX`;
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the default digest size is
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:py:data:`.crypto_generichash_BYTES`
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:type digest_size: int
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:return: an initizialized state buffer
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:rtype: object
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"""
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_checkparams(digest_size, key, salt, person)
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statebuf = ffi.new("unsigned char[]", crypto_generichash_STATEBYTES)
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# both _salt and _personal must be zero-padded to the correct length
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_salt = ffi.new("unsigned char []", crypto_generichash_SALTBYTES)
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_person = ffi.new("unsigned char []", crypto_generichash_PERSONALBYTES)
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ffi.memmove(_salt, salt, len(salt))
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ffi.memmove(_person, person, len(person))
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rc = lib.crypto_generichash_blake2b_init_salt_personal(statebuf,
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key, len(key),
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digest_size,
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_salt, _person)
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ensure(rc == 0, 'Unexpected failure',
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raising=exc.RuntimeError)
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return statebuf
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def generichash_blake2b_update(statebuf, data):
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"""Update the blake2b hash state
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:param statebuf: an initialized blake2b state buffer as returned from
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:py:func:`.crypto_generichash_blake2b_init`
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:type statebuf: object
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:param data:
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:type data: bytes
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"""
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ensure(isinstance(data, bytes),
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'Input data must be a bytes sequence',
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raising=exc.TypeError)
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rc = lib.crypto_generichash_blake2b_update(statebuf, data, len(data))
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ensure(rc == 0, 'Unexpected failure',
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raising=exc.RuntimeError)
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def generichash_blake2b_final(statebuf, digest_size):
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"""Finalize the blake2b hash state and return the digest.
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:param statebuf:
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:type statebuf: object
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:param digest_size:
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:type digest_size: int
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:return: the blake2 digest of the passed-in data stream
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:rtype: bytes
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"""
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_digest = ffi.new("unsigned char[]", crypto_generichash_BYTES_MAX)
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rc = lib.crypto_generichash_blake2b_final(statebuf, _digest, digest_size)
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ensure(rc == 0, 'Unexpected failure',
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raising=exc.RuntimeError)
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return ffi.buffer(_digest, digest_size)[:]
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def generichash_blake2b_state_copy(statebuf):
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"""Return a copy of the given blake2b hash state"""
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newstate = ffi.new("unsigned char[]", crypto_generichash_STATEBYTES)
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ffi.memmove(newstate, statebuf, crypto_generichash_STATEBYTES)
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return newstate
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