1# Copyright 2017 Google LLC 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# http://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14 15"""RSA cryptography signer and verifier.""" 16 17 18try: 19 # Prefer cryptograph-based RSA implementation. 20 from google.auth.crypt import _cryptography_rsa 21 22 RSASigner = _cryptography_rsa.RSASigner 23 RSAVerifier = _cryptography_rsa.RSAVerifier 24except ImportError: # pragma: NO COVER 25 # Fallback to pure-python RSA implementation if cryptography is 26 # unavailable. 27 from google.auth.crypt import _python_rsa 28 29 RSASigner = _python_rsa.RSASigner 30 RSAVerifier = _python_rsa.RSAVerifier 31