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# Copyright 2013 Nebula, Inc.
# All Rights Reserved.
#
#    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.

import base64
import subprocess


class DecryptionFailure(Exception):
    pass


def decrypt_password(private_key, password):
    """Base64 decodes password and unencrypts it with private key.

    Requires openssl binary available in the path.
    """
    unencoded = base64.b64decode(password)
    cmd = ['openssl', 'rsautl', '-decrypt', '-inkey', private_key]
    proc = subprocess.Popen(cmd, stdin=subprocess.PIPE,
                            stdout=subprocess.PIPE,
                            stderr=subprocess.PIPE)
    out, err = proc.communicate(unencoded)
    proc.stdin.close()
    if proc.returncode:
        raise DecryptionFailure(err)
    return out