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/*
* X9.31 EMSA
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_EMSA_X931_H__
#define BOTAN_EMSA_X931_H__
#include <botan/emsa.h>
#include <botan/hash.h>
namespace Botan {
/**
* EMSA from X9.31 (EMSA2 in IEEE 1363)
* Useful for Rabin-Williams, also sometimes used with RSA in
* odd protocols.
*/
class BOTAN_DLL EMSA_X931 final : public EMSA
{
public:
/**
* @param hash the hash object to use
*/
explicit EMSA_X931(HashFunction* hash);
EMSA* clone() override { return new EMSA_X931(m_hash->clone()); }
private:
void update(const byte[], size_t) override;
secure_vector<byte> raw_data() override;
secure_vector<byte> encoding_of(const secure_vector<byte>&, size_t,
RandomNumberGenerator& rng) override;
bool verify(const secure_vector<byte>&, const secure_vector<byte>&,
size_t) override;
secure_vector<byte> m_empty_hash;
std::unique_ptr<HashFunction> m_hash;
byte m_hash_id;
};
}
#endif
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