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-rw-r--r--contrib/epee/src/wipeable_string.cpp146
1 files changed, 146 insertions, 0 deletions
diff --git a/contrib/epee/src/wipeable_string.cpp b/contrib/epee/src/wipeable_string.cpp
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+++ b/contrib/epee/src/wipeable_string.cpp
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+// Copyright (c) 2017, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+// conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+// of conditions and the following disclaimer in the documentation and/or other
+// materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+// used to endorse or promote products derived from this software without specific
+// prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <string.h>
+#include "misc_log_ex.h"
+#include "wipeable_string.h"
+
+namespace epee
+{
+
+void *(*wipeable_string::wipefunc)(void*, size_t) = NULL;
+
+wipeable_string::wipeable_string(const wipeable_string &other):
+ buffer(other.buffer)
+{
+}
+
+wipeable_string::wipeable_string(wipeable_string &&other)
+{
+ if (&other == this)
+ return;
+ buffer = std::move(other.buffer);
+}
+
+wipeable_string::wipeable_string(const std::string &other)
+{
+ grow(other.size());
+ memcpy(buffer.data(), other.c_str(), size());
+}
+
+wipeable_string::wipeable_string(std::string &&other)
+{
+ CHECK_AND_ASSERT_THROW_MES(wipefunc, "wipefunc is not set");
+ grow(other.size());
+ memcpy(buffer.data(), other.c_str(), size());
+ if (!other.empty())
+ {
+ wipefunc(&other[0], other.size()); // we're kinda left with this again aren't we
+ other = std::string();
+ }
+}
+
+wipeable_string::wipeable_string(const char *s)
+{
+ grow(strlen(s));
+ memcpy(buffer.data(), s, size());
+}
+
+wipeable_string::~wipeable_string()
+{
+ wipe();
+}
+
+void wipeable_string::wipe()
+{
+ CHECK_AND_ASSERT_THROW_MES(wipefunc, "wipefunc is not set");
+ wipefunc(buffer.data(), buffer.size() * sizeof(char));
+}
+
+void wipeable_string::grow(size_t sz, size_t reserved)
+{
+ CHECK_AND_ASSERT_THROW_MES(wipefunc, "wipefunc is not set");
+ if (reserved == 0)
+ reserved = sz;
+ CHECK_AND_ASSERT_THROW_MES(reserved >= sz, "reserved < sz");
+ if (reserved <= buffer.capacity())
+ return;
+ size_t old_sz = buffer.size();
+ std::unique_ptr<char[]> tmp{new char[old_sz]};
+ memcpy(tmp.get(), buffer.data(), old_sz * sizeof(char));
+ wipefunc(buffer.data(), old_sz * sizeof(char));
+ buffer.reserve(reserved);
+ buffer.resize(sz);
+ memcpy(buffer.data(), tmp.get(), sz * sizeof(char));
+ wipefunc(tmp.get(), old_sz * sizeof(char));
+}
+
+void wipeable_string::push_back(char c)
+{
+ grow(size() + 1);
+ buffer.push_back(c);
+}
+
+void wipeable_string::pop_back()
+{
+ resize(size() - 1);
+}
+
+void wipeable_string::resize(size_t sz)
+{
+ CHECK_AND_ASSERT_THROW_MES(wipefunc, "wipefunc is not set");
+ if (sz < buffer.size())
+ wipefunc(buffer.data() + sz, buffer.size() - sz);
+ grow(sz);
+}
+
+void wipeable_string::reserve(size_t sz)
+{
+ grow(size(), sz);
+}
+
+void wipeable_string::clear()
+{
+ resize(0);
+}
+
+wipeable_string &wipeable_string::operator=(wipeable_string &&other)
+{
+ if (&other != this)
+ buffer = std::move(other.buffer);
+ return *this;
+}
+
+wipeable_string &wipeable_string::operator=(const wipeable_string &other)
+{
+ if (&other != this)
+ buffer = other.buffer;
+ return *this;
+}
+
+}