Python cryptography.hazmat.primitives.ciphers.BlockCipherAlgorithm() Examples

The following are 11 code examples of cryptography.hazmat.primitives.ciphers.BlockCipherAlgorithm(). You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may also want to check out all available functions/classes of the module cryptography.hazmat.primitives.ciphers , or try the search function .
Example #1
Source File: cmac.py    From oss-ftp with MIT License 6 votes vote down vote up 
def __init__(self, algorithm, backend, ctx=None):
        if not isinstance(backend, CMACBackend):
            raise UnsupportedAlgorithm(
                "Backend object does not implement CMACBackend.",
                _Reasons.BACKEND_MISSING_INTERFACE
            )

        if not isinstance(algorithm, ciphers.BlockCipherAlgorithm):
            raise TypeError(
                "Expected instance of BlockCipherAlgorithm."
            )
        self._algorithm = algorithm

        self._backend = backend
        if ctx is None:
            self._ctx = self._backend.create_cmac_ctx(self._algorithm)
        else:
            self._ctx = ctx
Example #2
Source File: cmac.py    From Safejumper-for-Desktop with GNU General Public License v2.0 6 votes vote down vote up 
def __init__(self, algorithm, backend, ctx=None):
        if not isinstance(backend, CMACBackend):
            raise UnsupportedAlgorithm(
                "Backend object does not implement CMACBackend.",
                _Reasons.BACKEND_MISSING_INTERFACE
            )

        if not isinstance(algorithm, ciphers.BlockCipherAlgorithm):
            raise TypeError(
                "Expected instance of BlockCipherAlgorithm."
            )
        self._algorithm = algorithm

        self._backend = backend
        if ctx is None:
            self._ctx = self._backend.create_cmac_ctx(self._algorithm)
        else:
            self._ctx = ctx
Example #3
Source File: cmac.py    From teleport with Apache License 2.0 6 votes vote down vote up 
def __init__(self, algorithm, backend, ctx=None):
        if not isinstance(backend, CMACBackend):
            raise UnsupportedAlgorithm(
                "Backend object does not implement CMACBackend.",
                _Reasons.BACKEND_MISSING_INTERFACE
            )

        if not isinstance(algorithm, ciphers.BlockCipherAlgorithm):
            raise TypeError(
                "Expected instance of BlockCipherAlgorithm."
            )
        self._algorithm = algorithm

        self._backend = backend
        if ctx is None:
            self._ctx = self._backend.create_cmac_ctx(self._algorithm)
        else:
            self._ctx = ctx
Example #4
Source File: cmac.py    From teleport with Apache License 2.0 6 votes vote down vote up 
def __init__(self, algorithm, backend, ctx=None):
        if not isinstance(backend, CMACBackend):
            raise UnsupportedAlgorithm(
                "Backend object does not implement CMACBackend.",
                _Reasons.BACKEND_MISSING_INTERFACE
            )

        if not isinstance(algorithm, ciphers.BlockCipherAlgorithm):
            raise TypeError(
                "Expected instance of BlockCipherAlgorithm."
            )
        self._algorithm = algorithm

        self._backend = backend
        if ctx is None:
            self._ctx = self._backend.create_cmac_ctx(self._algorithm)
        else:
            self._ctx = ctx
Example #5
Source File: cmac.py    From teleport with Apache License 2.0 6 votes vote down vote up 
def __init__(self, algorithm, backend, ctx=None):
        if not isinstance(backend, CMACBackend):
            raise UnsupportedAlgorithm(
                "Backend object does not implement CMACBackend.",
                _Reasons.BACKEND_MISSING_INTERFACE
            )

        if not isinstance(algorithm, ciphers.BlockCipherAlgorithm):
            raise TypeError(
                "Expected instance of BlockCipherAlgorithm."
            )
        self._algorithm = algorithm

        self._backend = backend
        if ctx is None:
            self._ctx = self._backend.create_cmac_ctx(self._algorithm)
        else:
            self._ctx = ctx
Example #6
Source File: cmac.py    From learn_python3_spider with MIT License 6 votes vote down vote up 
def __init__(self, algorithm, backend, ctx=None):
        if not isinstance(backend, CMACBackend):
            raise UnsupportedAlgorithm(
                "Backend object does not implement CMACBackend.",
                _Reasons.BACKEND_MISSING_INTERFACE
            )

        if not isinstance(algorithm, ciphers.BlockCipherAlgorithm):
            raise TypeError(
                "Expected instance of BlockCipherAlgorithm."
            )
        self._algorithm = algorithm

        self._backend = backend
        if ctx is None:
            self._ctx = self._backend.create_cmac_ctx(self._algorithm)
        else:
            self._ctx = ctx
Example #7
Source File: cmac.py    From quickstart-git2s3 with Apache License 2.0 6 votes vote down vote up 
def __init__(self, algorithm, backend, ctx=None):
        if not isinstance(backend, CMACBackend):
            raise UnsupportedAlgorithm(
                "Backend object does not implement CMACBackend.",
                _Reasons.BACKEND_MISSING_INTERFACE
            )

        if not isinstance(algorithm, ciphers.BlockCipherAlgorithm):
            raise TypeError(
                "Expected instance of BlockCipherAlgorithm."
            )
        self._algorithm = algorithm

        self._backend = backend
        if ctx is None:
            self._ctx = self._backend.create_cmac_ctx(self._algorithm)
        else:
            self._ctx = ctx
Example #8
Source File: cmac.py    From quickstart-redhat-openshift with Apache License 2.0 6 votes vote down vote up 
def __init__(self, algorithm, backend, ctx=None):
        if not isinstance(backend, CMACBackend):
            raise UnsupportedAlgorithm(
                "Backend object does not implement CMACBackend.",
                _Reasons.BACKEND_MISSING_INTERFACE
            )

        if not isinstance(algorithm, ciphers.BlockCipherAlgorithm):
            raise TypeError(
                "Expected instance of BlockCipherAlgorithm."
            )
        self._algorithm = algorithm

        self._backend = backend
        if ctx is None:
            self._ctx = self._backend.create_cmac_ctx(self._algorithm)
        else:
            self._ctx = ctx
Example #9
Source File: cmac.py    From Carnets with BSD 3-Clause "New" or "Revised" License 6 votes vote down vote up 
def __init__(self, algorithm, backend, ctx=None):
        if not isinstance(backend, CMACBackend):
            raise UnsupportedAlgorithm(
                "Backend object does not implement CMACBackend.",
                _Reasons.BACKEND_MISSING_INTERFACE
            )

        if not isinstance(algorithm, ciphers.BlockCipherAlgorithm):
            raise TypeError(
                "Expected instance of BlockCipherAlgorithm."
            )
        self._algorithm = algorithm

        self._backend = backend
        if ctx is None:
            self._ctx = self._backend.create_cmac_ctx(self._algorithm)
        else:
            self._ctx = ctx
Example #10
Source File: ciphers.py    From oss-ftp with MIT License 4 votes vote down vote up 
def __init__(self, backend, cipher, mode, operation):
        self._backend = backend
        self._cipher = cipher
        self._mode = mode
        self._operation = operation
        # There is a bug in CommonCrypto where block ciphers do not raise
        # kCCAlignmentError when finalizing if you supply non-block aligned
        # data. To work around this we need to keep track of the block
        # alignment ourselves, but only for alg+mode combos that require
        # block alignment. OFB, CFB, and CTR make a block cipher algorithm
        # into a stream cipher so we don't need to track them (and thus their
        # block size is effectively 1 byte just like OpenSSL/CommonCrypto
        # treat RC4 and other stream cipher block sizes).
        # This bug has been filed as rdar://15589470
        self._bytes_processed = 0
        if (isinstance(cipher, ciphers.BlockCipherAlgorithm) and not
                isinstance(mode, (OFB, CFB, CFB8, CTR))):
            self._byte_block_size = cipher.block_size // 8
        else:
            self._byte_block_size = 1

        registry = self._backend._cipher_registry
        try:
            cipher_enum, mode_enum = registry[type(cipher), type(mode)]
        except KeyError:
            raise UnsupportedAlgorithm(
                "cipher {0} in {1} mode is not supported "
                "by this backend.".format(
                    cipher.name, mode.name if mode else mode),
                _Reasons.UNSUPPORTED_CIPHER
            )

        ctx = self._backend._ffi.new("CCCryptorRef *")
        ctx = self._backend._ffi.gc(ctx, self._backend._release_cipher_ctx)

        if isinstance(mode, modes.ModeWithInitializationVector):
            iv_nonce = mode.initialization_vector
        elif isinstance(mode, modes.ModeWithNonce):
            iv_nonce = mode.nonce
        else:
            iv_nonce = self._backend._ffi.NULL

        if isinstance(mode, CTR):
            mode_option = self._backend._lib.kCCModeOptionCTR_BE
        else:
            mode_option = 0

        res = self._backend._lib.CCCryptorCreateWithMode(
            operation,
            mode_enum, cipher_enum,
            self._backend._lib.ccNoPadding, iv_nonce,
            cipher.key, len(cipher.key),
            self._backend._ffi.NULL, 0, 0, mode_option, ctx)
        self._backend._check_cipher_response(res)

        self._ctx = ctx
Example #11
Source File: ciphers.py    From Safejumper-for-Desktop with GNU General Public License v2.0 4 votes vote down vote up 
def __init__(self, backend, cipher, mode, operation):
        self._backend = backend
        self._cipher = cipher
        self._mode = mode
        self._operation = operation
        # There is a bug in CommonCrypto where block ciphers do not raise
        # kCCAlignmentError when finalizing if you supply non-block aligned
        # data. To work around this we need to keep track of the block
        # alignment ourselves, but only for alg+mode combos that require
        # block alignment. OFB, CFB, and CTR make a block cipher algorithm
        # into a stream cipher so we don't need to track them (and thus their
        # block size is effectively 1 byte just like OpenSSL/CommonCrypto
        # treat RC4 and other stream cipher block sizes).
        # This bug has been filed as rdar://15589470
        self._bytes_processed = 0
        if (isinstance(cipher, ciphers.BlockCipherAlgorithm) and not
                isinstance(mode, (OFB, CFB, CFB8, CTR))):
            self._byte_block_size = cipher.block_size // 8
        else:
            self._byte_block_size = 1

        registry = self._backend._cipher_registry
        try:
            cipher_enum, mode_enum = registry[type(cipher), type(mode)]
        except KeyError:
            raise UnsupportedAlgorithm(
                "cipher {0} in {1} mode is not supported "
                "by this backend.".format(
                    cipher.name, mode.name if mode else mode),
                _Reasons.UNSUPPORTED_CIPHER
            )

        ctx = self._backend._ffi.new("CCCryptorRef *")
        ctx = self._backend._ffi.gc(ctx, self._backend._release_cipher_ctx)

        if isinstance(mode, modes.ModeWithInitializationVector):
            iv_nonce = mode.initialization_vector
        elif isinstance(mode, modes.ModeWithNonce):
            iv_nonce = mode.nonce
        else:
            iv_nonce = self._backend._ffi.NULL

        if isinstance(mode, CTR):
            mode_option = self._backend._lib.kCCModeOptionCTR_BE
        else:
            mode_option = 0

        res = self._backend._lib.CCCryptorCreateWithMode(
            operation,
            mode_enum, cipher_enum,
            self._backend._lib.ccNoPadding, iv_nonce,
            cipher.key, len(cipher.key),
            self._backend._ffi.NULL, 0, 0, mode_option, ctx)
        self._backend._check_cipher_response(res)

        self._ctx = ctx