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import Crypto.Hash.SHA256 import Crypto.Hash.SHA384 import Crypto.Hash.SHA512 from Crypto.PublicKey import RSA from Crypto.Signature import PKCS1_v1_5 from oci._vendor.jwt.algorithms import Algorithm from oci._vendor.jwt.compat import string_types, text_type class RSAAlgorithm(Algorithm): """ Performs signing and verification operations using RSASSA-PKCS-v1_5 and the specified hash function. This class requires PyCrypto package to be installed. This is based off of the implementation in PyJWT 0.3.2 """ SHA256 = Crypto.Hash.SHA256 SHA384 = Crypto.Hash.SHA384 SHA512 = Crypto.Hash.SHA512 def __init__(self, hash_alg): self.hash_alg = hash_alg def prepare_key(self, key): if isinstance(key, RSA._RSAobj): return key if isinstance(key, string_types): if isinstance(key, text_type): key = key.encode('utf-8') key = RSA.importKey(key) else: raise TypeError('Expecting a PEM- or RSA-formatted key.') return key def sign(self, msg, key): return PKCS1_v1_5.new(key).sign(self.hash_alg.new(msg)) def verify(self, msg, key, sig): return PKCS1_v1_5.new(key).verify(self.hash_alg.new(msg), sig)