36 lines
1.2 KiB
Python
Executable File
36 lines
1.2 KiB
Python
Executable File
# Copyright 2014 Google Inc. All rights reserved.
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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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# http://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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"""fastrand.py - Python wrapper for _fastrand."""
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# NOTE: We could retire this module in favor of the C++ client? One reason to
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# keep it is if it supports a wider range of params (e.g. more than 32 or 64
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# bits.)
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import random
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import _fastrand
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class FastIrrRand(object):
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"""Fast insecure version of rappor.SecureIrrRand."""
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def __init__(self, params):
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randbits = _fastrand.randbits # accelerated function
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num_bits = params.num_bloombits
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# IRR probabilities
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self.p_gen = lambda: randbits(params.prob_p, num_bits)
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self.q_gen = lambda: randbits(params.prob_q, num_bits)
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