mirror of
https://github.com/biergaizi/codecrypt
synced 2024-06-16 11:58:16 +00:00
62 lines
1.6 KiB
C++
62 lines
1.6 KiB
C++
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/*
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* This file is part of Codecrypt.
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*
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* Copyright (C) 2013-2017 Mirek Kratochvil <exa.exa@gmail.com>
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*
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* Codecrypt is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or (at
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* your option) any later version.
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*
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* Codecrypt 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 or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "generator.h"
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#include "iohelpers.h"
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#include <fstream>
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#include <vector>
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#include <string.h> //for strerror
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#include <stdlib.h> //for getenv
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static inline uint bytes (uint bits)
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{
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return (bits >> 3) + ( (bits & 7) ? 1 : 0);
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}
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bool ccr_rng::seed (uint bits, bool quick)
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{
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std::vector<byte> s;
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std::ifstream f;
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uint b = bytes (bits);
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if (b > 256) b = 256;
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char*user_source = getenv ("CCR_RANDOM_SEED");
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std::string seed_source = user_source ? user_source :
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quick ? "/dev/urandom" :
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"/dev/random";
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f.open (seed_source, std::ios::in | std::ios::binary);
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if (!f.good()) {
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err ("opening " << seed_source << " failed: "
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<< strerror (errno));
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return false;
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}
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s.resize (b);
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for (uint i = 0; i < b; ++i) f >> s[i];
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f.close();
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r.load_key_vector (s);
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return true;
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}
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