//usr/lib64/python3.9/site-packages/cryptography/hazmat/backends/openssl
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.. / Parent Directory
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__init__.py — 271 B
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aead.py — 6.1 KB
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backend.py — 86.21 KB
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ciphers.py — 10.15 KB
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cmac.py — 2.78 KB
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decode_asn1.py — 1.09 KB
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dh.py — 10.95 KB
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dsa.py — 10.46 KB
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encode_asn1.py — 570 B
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hashes.py — 3.03 KB
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hmac.py — 2.87 KB
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poly1305.py — 2.29 KB
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rsa.py — 20.95 KB
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utils.py — 2.39 KB
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x25519.py — 4.51 KB
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openssl
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# 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 cryptography import utils from cryptography.exceptions import ( InvalidSignature, UnsupportedAlgorithm, _Reasons, ) from cryptography.hazmat.primitives import constant_time from cryptography.hazmat.primitives.ciphers.modes import CBC class _CMACContext(object): def __init__(self, backend, algorithm, ctx=None): if not backend.cmac_algorithm_supported(algorithm): raise UnsupportedAlgorithm( "This backend does not support CMAC.", _Reasons.UNSUPPORTED_CIPHER, ) self._backend = backend self._key = algorithm.key self._algorithm = algorithm self._output_length = algorithm.block_size // 8 if ctx is None: registry = self._backend._cipher_registry adapter = registry[type(algorithm), CBC] evp_cipher = adapter(self._backend, algorithm, CBC) ctx = self._backend._lib.CMAC_CTX_new() self._backend.openssl_assert(ctx != self._backend._ffi.NULL) ctx = self._backend._ffi.gc(ctx, self._backend._lib.CMAC_CTX_free) key_ptr = self._backend._ffi.from_buffer(self._key) res = self._backend._lib.CMAC_Init( ctx, key_ptr, len(self._key), evp_cipher, self._backend._ffi.NULL, ) self._backend.openssl_assert(res == 1) self._ctx = ctx algorithm = utils.read_only_property("_algorithm") def update(self, data: bytes) -> None: res = self._backend._lib.CMAC_Update(self._ctx, data, len(data)) self._backend.openssl_assert(res == 1) def finalize(self) -> bytes: buf = self._backend._ffi.new("unsigned char[]", self._output_length) length = self._backend._ffi.new("size_t *", self._output_length) res = self._backend._lib.CMAC_Final(self._ctx, buf, length) self._backend.openssl_assert(res == 1) self._ctx = None return self._backend._ffi.buffer(buf)[:] def copy(self) -> "_CMACContext": copied_ctx = self._backend._lib.CMAC_CTX_new() copied_ctx = self._backend._ffi.gc( copied_ctx, self._backend._lib.CMAC_CTX_free ) res = self._backend._lib.CMAC_CTX_copy(copied_ctx, self._ctx) self._backend.openssl_assert(res == 1) return _CMACContext(self._backend, self._algorithm, ctx=copied_ctx) def verify(self, signature: bytes) -> None: digest = self.finalize() if not constant_time.bytes_eq(digest, signature): raise InvalidSignature("Signature did not match digest.")