98 lines
2.3 KiB
Python
98 lines
2.3 KiB
Python
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# Copyright 2011 Sybren A. Stüvel <sybren@stuvel.eu>
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Functions for parallel computation on multiple cores.
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Introduced in Python-RSA 3.1.
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.. note::
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Requires Python 2.6 or newer.
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"""
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import multiprocessing as mp
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from multiprocessing.connection import Connection
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import rsa.prime
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import rsa.randnum
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def _find_prime(nbits: int, pipe: Connection) -> None:
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while True:
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integer = rsa.randnum.read_random_odd_int(nbits)
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# Test for primeness
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if rsa.prime.is_prime(integer):
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pipe.send(integer)
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return
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def getprime(nbits: int, poolsize: int) -> int:
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"""Returns a prime number that can be stored in 'nbits' bits.
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Works in multiple threads at the same time.
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>>> p = getprime(128, 3)
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>>> rsa.prime.is_prime(p-1)
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False
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>>> rsa.prime.is_prime(p)
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True
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>>> rsa.prime.is_prime(p+1)
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False
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>>> from rsa import common
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>>> common.bit_size(p) == 128
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True
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"""
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(pipe_recv, pipe_send) = mp.Pipe(duplex=False)
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# Create processes
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try:
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procs = [mp.Process(target=_find_prime, args=(nbits, pipe_send))
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for _ in range(poolsize)]
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# Start processes
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for p in procs:
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p.start()
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result = pipe_recv.recv()
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finally:
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pipe_recv.close()
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pipe_send.close()
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# Terminate processes
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for p in procs:
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p.terminate()
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return result
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__all__ = ['getprime']
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if __name__ == '__main__':
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print('Running doctests 1000x or until failure')
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import doctest
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for count in range(100):
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(failures, tests) = doctest.testmod()
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if failures:
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break
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if count % 10 == 0 and count:
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print('%i times' % count)
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print('Doctests done')
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