# 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]]
Name | Type | Size | Permission | Actions |
---|---|---|---|---|
__pycache__ | Folder | 0755 |
|
|
__init__.py | File | 336 B | 0644 |
|
aead.py | File | 5.45 KB | 0644 |
|
backend.py | File | 73.75 KB | 0644 |
|
ciphers.py | File | 8.87 KB | 0644 |
|
cmac.py | File | 2.72 KB | 0644 |
|
decode_asn1.py | File | 30.09 KB | 0644 |
|
dh.py | File | 10.59 KB | 0644 |
|
dsa.py | File | 10.04 KB | 0644 |
|
ec.py | File | 10.04 KB | 0644 |
|
encode_asn1.py | File | 21.76 KB | 0644 |
|
hashes.py | File | 2.47 KB | 0644 |
|
hmac.py | File | 2.89 KB | 0644 |
|
rsa.py | File | 17.16 KB | 0644 |
|
utils.py | File | 1.37 KB | 0644 |
|
x25519.py | File | 2.73 KB | 0644 |
|
x509.py | File | 17.81 KB | 0644 |
|