//usr/lib64/python3.9/site-packages/cryptography/hazmat/primitives
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asymmetric — dir
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ciphers — dir
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__init__.py — 180 B
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_asymmetric.py — 485 B
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_cipheralgorithm.py — 1000 B
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_serialization.py — 1.31 KB
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cmac.py — 1.78 KB
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constant_time.py — 387 B
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hashes.py — 5.82 KB
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hmac.py — 1.98 KB
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keywrap.py — 5.61 KB
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padding.py — 6.04 KB
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poly1305.py — 1.67 KB
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primitives
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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. import typing from cryptography import utils from cryptography.exceptions import ( AlreadyFinalized, ) from cryptography.hazmat.primitives import hashes class HMAC(hashes.HashContext): def __init__( self, key: bytes, algorithm: hashes.HashAlgorithm, backend: typing.Any = None, ctx=None, ): if not isinstance(algorithm, hashes.HashAlgorithm): raise TypeError("Expected instance of hashes.HashAlgorithm.") self._algorithm = algorithm self._key = key if ctx is None: from cryptography.hazmat.backends.openssl.backend import ( backend as ossl, ) self._ctx = ossl.create_hmac_ctx(key, self.algorithm) else: self._ctx = ctx @property def algorithm(self) -> hashes.HashAlgorithm: return self._algorithm def update(self, data: bytes) -> None: if self._ctx is None: raise AlreadyFinalized("Context was already finalized.") utils._check_byteslike("data", data) self._ctx.update(data) def copy(self) -> "HMAC": if self._ctx is None: raise AlreadyFinalized("Context was already finalized.") return HMAC( self._key, self.algorithm, ctx=self._ctx.copy(), ) def finalize(self) -> bytes: if self._ctx is None: raise AlreadyFinalized("Context was already finalized.") digest = self._ctx.finalize() self._ctx = None return digest def verify(self, signature: bytes) -> None: utils._check_bytes("signature", signature) if self._ctx is None: raise AlreadyFinalized("Context was already finalized.") ctx, self._ctx = self._ctx, None ctx.verify(signature)