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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/internal/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 EMSA_X931 final : public EMSA
{
public:
/**
* @param hash the hash function to use
*/
explicit EMSA_X931(std::unique_ptr<HashFunction> hash);
std::unique_ptr<EMSA> new_object() override { return std::make_unique<EMSA_X931>(m_hash->new_object()); }
std::string name() const override;
bool requires_message_recovery() const override { return true; }
private:
void update(const uint8_t[], size_t) override;
secure_vector<uint8_t> raw_data() override;
secure_vector<uint8_t> encoding_of(const secure_vector<uint8_t>&, size_t,
RandomNumberGenerator& rng) override;
bool verify(const secure_vector<uint8_t>&, const secure_vector<uint8_t>&,
size_t) override;
secure_vector<uint8_t> m_empty_hash;
std::unique_ptr<HashFunction> m_hash;
uint8_t m_hash_id;
};
}
#endif
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