/usr/lib/python2.7/dist-packages/cryptography/hazmat/backends/openssl/hashes.py is in python-cryptography 2.1.4-1ubuntu1.1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | # This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from __future__ import absolute_import, division, print_function
from cryptography import utils
from cryptography.exceptions import UnsupportedAlgorithm, _Reasons
from cryptography.hazmat.primitives import hashes
@utils.register_interface(hashes.HashContext)
class _HashContext(object):
def __init__(self, backend, algorithm, ctx=None):
self._algorithm = algorithm
self._backend = backend
if ctx is None:
ctx = self._backend._lib.Cryptography_EVP_MD_CTX_new()
ctx = self._backend._ffi.gc(
ctx, self._backend._lib.Cryptography_EVP_MD_CTX_free
)
name = self._backend._build_openssl_digest_name(algorithm)
evp_md = self._backend._lib.EVP_get_digestbyname(name)
if evp_md == self._backend._ffi.NULL:
raise UnsupportedAlgorithm(
"{0} is not a supported hash on this backend.".format(
name),
_Reasons.UNSUPPORTED_HASH
)
res = self._backend._lib.EVP_DigestInit_ex(ctx, evp_md,
self._backend._ffi.NULL)
self._backend.openssl_assert(res != 0)
self._ctx = ctx
algorithm = utils.read_only_property("_algorithm")
def copy(self):
copied_ctx = self._backend._lib.Cryptography_EVP_MD_CTX_new()
copied_ctx = self._backend._ffi.gc(
copied_ctx, self._backend._lib.Cryptography_EVP_MD_CTX_free
)
res = self._backend._lib.EVP_MD_CTX_copy_ex(copied_ctx, self._ctx)
self._backend.openssl_assert(res != 0)
return _HashContext(self._backend, self.algorithm, ctx=copied_ctx)
def update(self, data):
res = self._backend._lib.EVP_DigestUpdate(self._ctx, data, len(data))
self._backend.openssl_assert(res != 0)
def finalize(self):
buf = self._backend._ffi.new("unsigned char[]",
self._backend._lib.EVP_MAX_MD_SIZE)
outlen = self._backend._ffi.new("unsigned int *")
res = self._backend._lib.EVP_DigestFinal_ex(self._ctx, buf, outlen)
self._backend.openssl_assert(res != 0)
self._backend.openssl_assert(outlen[0] == self.algorithm.digest_size)
return self._backend._ffi.buffer(buf)[:outlen[0]]
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