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/*
* ISO-9796-2 - Digital signature schemes giving message recovery schemes 2 and 3
* (C) 2016 Tobias Niemann, Hackmanit GmbH
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_ISO9796_H_
#define BOTAN_ISO9796_H_
#include <botan/internal/emsa.h>
#include <botan/hash.h>
namespace Botan {
/**
* ISO-9796-2 - Digital signature scheme 2 (probabilistic)
*/
class ISO_9796_DS2 final : public EMSA
{
public:
/**
* @param hash function to use
* @param implicit whether or not the trailer is implicit
*/
explicit ISO_9796_DS2(std::unique_ptr<HashFunction> hash, bool implicit = false) :
m_hash(std::move(hash)),
m_implicit(implicit),
m_SALT_SIZE(hash->output_length())
{}
/**
* @param hash function to use
* @param implicit whether or not the trailer is implicit
* @param salt_size size of the salt to use in bytes
*/
ISO_9796_DS2(std::unique_ptr<HashFunction> hash, bool implicit, size_t salt_size) :
m_hash(std::move(hash)),
m_implicit(implicit),
m_SALT_SIZE(salt_size)
{}
std::unique_ptr<EMSA> new_object() override;
std::string name() const override;
bool requires_message_recovery() const override { return true; }
private:
void update(const uint8_t input[], size_t length) override;
secure_vector<uint8_t> raw_data() override;
secure_vector<uint8_t> encoding_of(const secure_vector<uint8_t>& msg,
size_t output_bits,
RandomNumberGenerator& rng) override;
bool verify(const secure_vector<uint8_t>& coded,
const secure_vector<uint8_t>& raw,
size_t key_bits) override;
std::unique_ptr<HashFunction> m_hash;
bool m_implicit;
size_t m_SALT_SIZE;
secure_vector<uint8_t> m_msg_buffer;
};
/**
* ISO-9796-2 - Digital signature scheme 3 (deterministic)
*/
class ISO_9796_DS3 final : public EMSA
{
public:
/**
* @param hash function to use
* @param implicit whether or not the trailer is implicit
*/
ISO_9796_DS3(std::unique_ptr<HashFunction> hash, bool implicit = false) :
m_hash(std::move(hash)),
m_implicit(implicit)
{}
std::unique_ptr<EMSA> new_object() override;
std::string name() const override;
bool requires_message_recovery() const override { return true; }
private:
void update(const uint8_t input[], size_t length) override;
secure_vector<uint8_t> raw_data() override;
secure_vector<uint8_t> encoding_of(const secure_vector<uint8_t>& msg,
size_t output_bits,
RandomNumberGenerator& rng) override;
bool verify(const secure_vector<uint8_t>& coded,
const secure_vector<uint8_t>& raw,
size_t key_bits) override;
std::unique_ptr<HashFunction> m_hash;
bool m_implicit;
secure_vector<uint8_t> m_msg_buffer;
};
}
#endif
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