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/*************************************************
* Secure Memory Buffers Header File *
* (C) 1999-2008 The Botan Project *
*************************************************/
#ifndef BOTAN_SECURE_MEMORY_BUFFERS_H__
#define BOTAN_SECURE_MEMORY_BUFFERS_H__
#include <botan/allocate.h>
#include <botan/mem_ops.h>
namespace Botan {
/*************************************************
* Variable Length Memory Buffer *
*************************************************/
template<typename T>
class MemoryRegion
{
public:
u32bit size() const { return used; }
u32bit is_empty() const { return (used == 0); }
u32bit has_items() const { return (used != 0); }
operator T* () { return buf; }
operator const T* () const { return buf; }
T* begin() { return buf; }
const T* begin() const { return buf; }
T* end() { return (buf + size()); }
const T* end() const { return (buf + size()); }
bool operator==(const MemoryRegion<T>& other) const
{
return (size() == other.size() &&
same_mem(buf, other.buf, size()));
}
bool operator<(const MemoryRegion<T>&) const;
bool operator!=(const MemoryRegion<T>& in) const
{ return (!(*this == in)); }
MemoryRegion<T>& operator=(const MemoryRegion<T>& in)
{ if(this != &in) set(in); return (*this); }
void copy(const T in[], u32bit n)
{ copy(0, in, n); }
void copy(u32bit off, const T in[], u32bit n)
{ copy_mem(buf + off, in, (n > size() - off) ? (size() - off) : n); }
void set(const T in[], u32bit n) { create(n); copy(in, n); }
void set(const MemoryRegion<T>& in) { set(in.begin(), in.size()); }
void append(const T data[], u32bit n)
{ grow_to(size()+n); copy(size() - n, data, n); }
void append(T x) { append(&x, 1); }
void append(const MemoryRegion<T>& x) { append(x.begin(), x.size()); }
void clear() { clear_mem(buf, allocated); }
void destroy() { create(0); }
void create(u32bit);
void grow_to(u32bit) const;
void swap(MemoryRegion<T>&);
~MemoryRegion() { deallocate(buf, allocated); }
protected:
MemoryRegion() { buf = 0; alloc = 0; used = allocated = 0; }
MemoryRegion(const MemoryRegion<T>& copy)
{
buf = 0;
used = allocated = 0;
alloc = copy.alloc;
set(copy.buf, copy.used);
}
void init(bool locking, u32bit size = 0)
{ alloc = Allocator::get(locking); create(size); }
private:
T* allocate(u32bit n) const
{
return static_cast<T*>(alloc->allocate(sizeof(T)*n));
}
void deallocate(T* p, u32bit n) const
{ alloc->deallocate(p, sizeof(T)*n); }
mutable T* buf;
mutable u32bit used;
mutable u32bit allocated;
mutable Allocator* alloc;
};
/*************************************************
* Create a new buffer *
*************************************************/
template<typename T>
void MemoryRegion<T>::create(u32bit n)
{
if(n <= allocated) { clear(); used = n; return; }
deallocate(buf, allocated);
buf = allocate(n);
allocated = used = n;
}
/*************************************************
* Increase the size of the buffer *
*************************************************/
template<typename T>
void MemoryRegion<T>::grow_to(u32bit n) const
{
if(n > used && n <= allocated)
{
clear_mem(buf + used, n - used);
used = n;
return;
}
else if(n > allocated)
{
T* new_buf = allocate(n);
copy_mem(new_buf, buf, used);
deallocate(buf, allocated);
buf = new_buf;
allocated = used = n;
}
}
/*************************************************
* Compare this buffer with another one *
*************************************************/
template<typename T>
bool MemoryRegion<T>::operator<(const MemoryRegion<T>& in) const
{
if(size() < in.size()) return true;
if(size() > in.size()) return false;
for(u32bit j = 0; j != size(); j++)
{
if(buf[j] < in[j]) return true;
if(buf[j] > in[j]) return false;
}
return false;
}
/*************************************************
* Swap this buffer with another one *
*************************************************/
template<typename T>
void MemoryRegion<T>::swap(MemoryRegion<T>& x)
{
std::swap(buf, x.buf);
std::swap(used, x.used);
std::swap(allocated, x.allocated);
std::swap(alloc, x.alloc);
}
/*************************************************
* Unlocked Variable Length Buffer *
*************************************************/
template<typename T>
class MemoryVector : public MemoryRegion<T>
{
public:
MemoryVector<T>& operator=(const MemoryRegion<T>& in)
{ if(this != &in) set(in); return (*this); }
MemoryVector(u32bit n = 0) { MemoryRegion<T>::init(false, n); }
MemoryVector(const T in[], u32bit n)
{ MemoryRegion<T>::init(false); set(in, n); }
MemoryVector(const MemoryRegion<T>& in)
{ MemoryRegion<T>::init(false); set(in); }
MemoryVector(const MemoryRegion<T>& in1, const MemoryRegion<T>& in2)
{ MemoryRegion<T>::init(false); set(in1); append(in2); }
};
/*************************************************
* Locked Variable Length Buffer *
*************************************************/
template<typename T>
class SecureVector : public MemoryRegion<T>
{
public:
SecureVector<T>& operator=(const MemoryRegion<T>& in)
{ if(this != &in) set(in); return (*this); }
SecureVector(u32bit n = 0) { MemoryRegion<T>::init(true, n); }
SecureVector(const T in[], u32bit n)
{ MemoryRegion<T>::init(true); set(in, n); }
SecureVector(const MemoryRegion<T>& in)
{ MemoryRegion<T>::init(true); set(in); }
SecureVector(const MemoryRegion<T>& in1, const MemoryRegion<T>& in2)
{ MemoryRegion<T>::init(true); set(in1); append(in2); }
};
/*************************************************
* Locked Fixed Length Buffer *
*************************************************/
template<typename T, u32bit L>
class SecureBuffer : public MemoryRegion<T>
{
public:
SecureBuffer<T,L>& operator=(const SecureBuffer<T,L>& in)
{ if(this != &in) set(in); return (*this); }
SecureBuffer() { MemoryRegion<T>::init(true, L); }
SecureBuffer(const T in[], u32bit n)
{ MemoryRegion<T>::init(true, L); copy(in, n); }
private:
SecureBuffer<T, L>& operator=(const MemoryRegion<T>& in)
{ if(this != &in) set(in); return (*this); }
};
}
#endif
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