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/*
* EMSA Classes
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_PUBKEY_EMSA_H__
#define BOTAN_PUBKEY_EMSA_H__
#include <botan/scan_name.h>
#include <botan/secmem.h>
#include <botan/rng.h>
namespace Botan {
/**
* EMSA, from IEEE 1363s Encoding Method for Signatures, Appendix
*
* Any way of encoding/padding signatures
*/
class BOTAN_DLL EMSA
{
public:
typedef SCAN_Name Spec;
/**
* Add more data to the signature computation
* @param input some data
* @param length length of input in bytes
*/
virtual void update(const byte input[], size_t length) = 0;
/**
* @return raw hash
*/
virtual secure_vector<byte> raw_data() = 0;
/**
* Return the encoding of a message
* @param msg the result of raw_data()
* @param output_bits the desired output bit size
* @param rng a random number generator
* @return encoded signature
*/
virtual secure_vector<byte> encoding_of(const secure_vector<byte>& msg,
size_t output_bits,
RandomNumberGenerator& rng) = 0;
/**
* Verify the encoding
* @param coded the received (coded) message representative
* @param raw the computed (local, uncoded) message representative
* @param key_bits the size of the key in bits
* @return true if coded is a valid encoding of raw, otherwise false
*/
virtual bool verify(const secure_vector<byte>& coded,
const secure_vector<byte>& raw,
size_t key_bits) = 0;
virtual ~EMSA();
};
/**
* Factory method for EMSA (message-encoding methods for signatures
* with appendix) objects
* @param algo_spec the name of the EME to create
* @return pointer to newly allocated object of that type
*/
BOTAN_DLL EMSA* get_emsa(const std::string& algo_spec);
}
#endif
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