2fac017618
This follows weeks of discussion on the gnupg-devel mailing list. Hopefully it will make it easier for people using Python to use GnuPG in the future. Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
85 lines
2.8 KiB
Python
Executable File
85 lines
2.8 KiB
Python
Executable File
#!/usr/bin/env python
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# Copyright (C) 2016 g10 Code GmbH
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#
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# This file is part of GPGME.
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#
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# GPGME is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# GPGME is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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# Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this program; if not, see <http://www.gnu.org/licenses/>.
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from __future__ import absolute_import, print_function, unicode_literals
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del absolute_import, print_function, unicode_literals
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import sys
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import io
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import os
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import tempfile
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import gpg
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import support
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support.init_gpgme(gpg.constants.PROTOCOL_OpenPGP)
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# Both Context and Data can be used as context manager:
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with gpg.Context() as c, gpg.Data() as d:
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c.get_engine_info()
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d.write(b"Halloechen")
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leak_c = c
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leak_d = d
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assert leak_c.wrapped == None
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assert leak_d.wrapped == None
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def sign_and_verify(source, signed, sink):
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with gpg.Context() as c:
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c.op_sign(source, signed, gpg.constants.SIG_MODE_NORMAL)
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signed.seek(0, os.SEEK_SET)
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c.op_verify(signed, None, sink)
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result = c.op_verify_result()
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assert len(result.signatures) == 1, "Unexpected number of signatures"
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sig = result.signatures[0]
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assert sig.summary == (gpg.constants.SIGSUM_VALID |
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gpg.constants.SIGSUM_GREEN)
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assert gpg.errors.GPGMEError(sig.status).getcode() == gpg.errors.NO_ERROR
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sink.seek(0, os.SEEK_SET)
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assert sink.read() == b"Hallo Leute\n"
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# Demonstrate automatic wrapping of file-like objects with 'fileno'
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# method.
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with tempfile.TemporaryFile() as source, \
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tempfile.TemporaryFile() as signed, \
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tempfile.TemporaryFile() as sink:
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source.write(b"Hallo Leute\n")
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source.seek(0, os.SEEK_SET)
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sign_and_verify(source, signed, sink)
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if sys.version_info[0] == 3:
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# Python2's io.BytesIO does not implement the buffer interface,
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# hence we cannot use it as sink.
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# XXX: Python's io.BytesIo.truncate does not work as advertised.
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# http://bugs.python.org/issue27261
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bio = io.BytesIO()
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bio.truncate(1)
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if len(bio.getvalue()) != 1:
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# This version of Python is affected, preallocate buffer.
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preallocate = 128*b'\x00'
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else:
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preallocate = b''
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# Demonstrate automatic wrapping of objects implementing the buffer
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# interface, and the use of data objects with the 'with' statement.
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with io.BytesIO(preallocate) as signed, gpg.Data() as sink:
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sign_and_verify(b"Hallo Leute\n", signed, sink)
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