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22 lines
546 B
22 lines
546 B
// This file is under GNU General Public License 3.0
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// see LICENSE.txt
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#include "constant_time_algo.hh"
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namespace pEp {
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bool constant_time_equal(const std::string &a, const std::string &b)
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{
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if (a.size() != b.size())
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return false;
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unsigned d = 0;
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for (std::size_t idx = 0; idx < a.size(); ++idx) {
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d |= (static_cast<unsigned>(a[idx]) ^ static_cast<unsigned>(b[idx]));
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}
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// if d is still 0, the strings are equal.
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return d == 0;
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}
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} // end of namespace pEp
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