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Merge pull request #1234 from wingyplus/remove_vector_ref_cleanse

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Removed 'vector_ref::cleanse'
This commit is contained in:
Yoichi Hirai 2016-10-17 21:11:19 +02:00 committed by GitHub
commit f973390978
1 changed files with 0 additions and 20 deletions
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20
libdevcore/vector_ref.h
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@ -69,26 +69,6 @@ public:
void copyTo(vector_ref<typename std::remove_const<_T>::type> _t) const { if (overlapsWith(_t)) memmove(_t.data(), m_data, std::min(_t.size(), m_count) * sizeof(_T)); else memcpy(_t.data(), m_data, std::min(_t.size(), m_count) * sizeof(_T)); }
/// Copies the contents of this vector_ref to the contents of @a _t, and zeros further trailing elements in @a _t.
void populate(vector_ref<typename std::remove_const<_T>::type> _t) const { copyTo(_t); memset(_t.data() + m_count, 0, std::max(_t.size(), m_count) - m_count); }
/// Securely overwrite the memory.
/// @note adapted from OpenSSL's implementation.
void cleanse()
{
static unsigned char s_cleanseCounter = 0;
uint8_t* p = (uint8_t*)begin();
size_t const len = (uint8_t*)end() - p;
size_t loop = len;
size_t count = s_cleanseCounter;
while (loop--)
{
*(p++) = (uint8_t)count;
count += (17 + ((size_t)p & 0xf));
}
p = (uint8_t*)memchr((uint8_t*)begin(), (uint8_t)count, len);
if (p)
count += (63 + (size_t)p);
s_cleanseCounter = (uint8_t)count;
memset((uint8_t*)begin(), 0, len);
}
_T* begin() { return m_data; }
_T* end() { return m_data + m_count; }