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ea5fe35b54
* Renamed files to reflect digest family names * Add SHA256 to SHA2 * Add RIPEMD-160 to RIPEMD * Reduce duplicated code
88 lines
2.2 KiB
C++
88 lines
2.2 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef BEAST_CRYPTO_SECURE_ERASE_H_INCLUDED
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#define BEAST_CRYPTO_SECURE_ERASE_H_INCLUDED
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#include <cstddef>
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#include <cstdint>
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#include <new>
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namespace beast {
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namespace detail {
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class secure_erase_impl
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{
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private:
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struct base
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{
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virtual void operator()(
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void* dest, std::size_t bytes) const = 0;
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};
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struct impl : base
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{
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void operator()(
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void* dest, std::size_t bytes) const override
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{
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char volatile* volatile p =
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const_cast<volatile char*>(
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reinterpret_cast<char*>(dest));
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if (bytes == 0)
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return;
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do
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{
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*p = 0;
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}
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while(*p++ == 0 && --bytes);
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}
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};
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char buf_[sizeof(impl)];
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base& erase_;
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public:
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secure_erase_impl()
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: erase_(*new(buf_) impl)
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{
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}
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void operator()(
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void* dest, std::size_t bytes) const
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{
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return erase_(dest, bytes);
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}
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};
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}
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/** Guaranteed to fill memory with zeroes */
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template <class = void>
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void
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secure_erase (void* dest, std::size_t bytes)
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{
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static detail::secure_erase_impl const erase;
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erase(dest, bytes);
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}
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}
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#endif
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