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# Copyright 2017 Google LLC
#
# 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.
"""RSA cryptography signer and verifier."""
try:
# Prefer cryptograph-based RSA implementation.
from google.auth.crypt import _cryptography_rsa
RSASigner = _cryptography_rsa.RSASigner
RSAVerifier = _cryptography_rsa.RSAVerifier
except ImportError: # pragma: NO COVER
# Fallback to pure-python RSA implementation if cryptography is
# unavailable.
from google.auth.crypt import _python_rsa
RSASigner = _python_rsa.RSASigner
RSAVerifier = _python_rsa.RSAVerifier
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