# Copyright (C) 2016-2018 Virgil Security Inc.
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# Lead Maintainer: Virgil Security Inc. <support@virgilsecurity.com>
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from virgil_crypto_lib.foundation import Sha224, Sha256, Sha384, Sha512
[docs]class HashAlgorithm(object):
"""Enumeration containing supported Algorithms"""
[docs] class UnknownAlgorithmException(Exception):
"""Exception raised when Unknown Algorithm passed to convertion method"""
def __init__(self, algorithm):
super(HashAlgorithm.UnknownAlgorithmException, self).__init__(algorithm)
self.algorithm = algorithm
def __str__(self):
return "KeyPairType not found: %i" % self.algorithm
SHA224 = 0
SHA256 = 1
SHA384 = 2
SHA512 = 3
_ALGORITHMS_TO_NATIVE = {
SHA224: Sha224,
SHA256: Sha256,
SHA384: Sha384,
SHA512: Sha512,
}
[docs] @classmethod
def convert_to_native(cls, algorithm):
# type: (int) -> Type[Union[Sha224, Sha256, Sha384, Sha512]]
"""Converts algorithm enum value to native value
Args:
algorithm: algorithm for conversion.
Returns:
Native library algorithm id.
Raises:
UnknownAlgorithmException: if algorithm is not supported.
"""
if algorithm in cls._ALGORITHMS_TO_NATIVE:
return cls._ALGORITHMS_TO_NATIVE[algorithm]
raise cls.UnknownAlgorithmException(algorithm)