mirror of
https://github.com/deneraraujo/OpenVPNAdapter.git
synced 2026-01-31 00:00:06 +08:00
68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2017 OpenVPN Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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#ifndef OPENVPN_RANDOM_RANDBYTESTORE_H
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#define OPENVPN_RANDOM_RANDBYTESTORE_H
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#include <openvpn/common/size.hpp>
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namespace openvpn {
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template <typename RAND_TYPE>
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class RandomByteStore
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{
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public:
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static constexpr size_t SIZE = sizeof(typename RAND_TYPE::result_type);
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unsigned char get_byte(RAND_TYPE& rng)
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{
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if (n_bytes == 0)
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{
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res.rt = rng();
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n_bytes = SIZE;
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}
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unsigned char ret = res.bytes[0];
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res.rt >>= 8;
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--n_bytes;
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return ret;
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}
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template <typename T>
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void fill(T& obj, RAND_TYPE& rng)
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{
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unsigned char *data = reinterpret_cast<unsigned char *>(&obj);
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for (size_t i = 0; i < sizeof(obj); ++i)
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data[i] = get_byte(rng);
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}
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private:
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union Result {
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unsigned char bytes[SIZE];
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typename RAND_TYPE::result_type rt;
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};
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Result res;
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unsigned int n_bytes = 0;
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};
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}
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#endif
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