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/*
* Buffered Computation
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_BUFFERED_COMPUTATION_H__
#define BOTAN_BUFFERED_COMPUTATION_H__
#include <botan/secmem.h>
#include <botan/get_byte.h>
namespace Botan {
/**
* This class represents any kind of computation which uses an internal
* state, such as hash functions or MACs
*/
class BOTAN_DLL Buffered_Computation
{
public:
/**
* @return length of the output of this function in bytes
*/
virtual size_t output_length() const = 0;
/**
* Add new input to process.
* @param in the input to process as a byte array
* @param length of param in in bytes
*/
void update(const byte in[], size_t length) { add_data(in, length); }
/**
* Add new input to process.
* @param in the input to process as a MemoryRegion
*/
void update(const MemoryRegion<byte>& in)
{
add_data(&in[0], in.size());
}
/**
* Add an integer in big-endian order
* @param in the value
*/
template<typename T> void update_be(const T in)
{
for(size_t i = 0; i != sizeof(T); ++i)
{
byte b = get_byte(i, in);
add_data(&b, 1);
}
}
/**
* Add new input to process.
* @param str the input to process as a std::string. Will be interpreted
* as a byte array based on
* the strings encoding.
*/
void update(const std::string& str)
{
add_data(reinterpret_cast<const byte*>(str.data()), str.size());
}
/**
* Process a single byte.
* @param in the byte to process
*/
void update(byte in) { add_data(&in, 1); }
/**
* Complete the computation and retrieve the
* final result.
* @param out The byte array to be filled with the result.
* Must be of length output_length()
*/
void final(byte out[]) { final_result(out); }
/**
* Complete the computation and retrieve the
* final result.
* @return SecureVector holding the result
*/
SecureVector<byte> final()
{
SecureVector<byte> output(output_length());
final_result(&output[0]);
return output;
}
/**
* Update and finalize computation. Does the same as calling update()
* and final() consecutively.
* @param in the input to process as a byte array
* @param length the length of the byte array
* @result the result of the call to final()
*/
SecureVector<byte> process(const byte in[], size_t length)
{
add_data(in, length);
return final();
}
/**
* Update and finalize computation. Does the same as calling update()
* and final() consecutively.
* @param in the input to process
* @result the result of the call to final()
*/
SecureVector<byte> process(const MemoryRegion<byte>& in)
{
add_data(&in[0], in.size());
return final();
}
/**
* Update and finalize computation. Does the same as calling update()
* and final() consecutively.
* @param in the input to process as a string
* @result the result of the call to final()
*/
SecureVector<byte> process(const std::string& in)
{
update(in);
return final();
}
private:
/**
* Add more data to the computation
* @param input is an input buffer
* @param length is the length of input in bytes
*/
virtual void add_data(const byte input[], size_t length) = 0;
/**
* Write the final output to out
* @param out is an output buffer of output_length()
*/
virtual void final_result(byte out[]) = 0;
};
}
#endif
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