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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)