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# Copyright 2013 Donald Stufft and individual contributors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import absolute_import, division, print_function
class CryptoError(Exception):
"""
Base exception for all nacl related errors
"""
class BadSignatureError(CryptoError):
"""
Raised when the signature was forged or otherwise corrupt.
"""
class RuntimeError(RuntimeError, CryptoError):
pass
class AssertionError(AssertionError, CryptoError):
pass
class TypeError(TypeError, CryptoError):
pass
class ValueError(ValueError, CryptoError):
pass
class InvalidkeyError(CryptoError):
pass
def ensure(cond, *args, **kwds):
"""
Return if a condition is true, otherwise raise a caller-configurable
:py:class:`Exception`
:param bool cond: the condition to be checked
:param sequence args: the arguments to be passed to the exception's
constructor
The only accepted named parameter is `raising` used to configure the
exception to be raised if `cond` is not `True`
"""
_CHK_UNEXP = 'check_condition() got an unexpected keyword argument {0}'
raising = kwds.pop('raising', AssertionError)
if kwds:
raise TypeError(_CHK_UNEXP.format(repr(kwds.popitem()[0])))
if cond is True:
return
raise raising(*args)
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