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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/sig_padding.h>
#include <memory>
#include <string>
#include <vector>
namespace Botan {
class HashFunction;
/**
* ISO-9796-2 - Digital signature scheme 2 (probabilistic)
*/
class ISO_9796_DS2 final : public SignaturePaddingScheme {
public:
/**
* @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_len(salt_size) {}
std::string hash_function() const override;
std::string name() const override;
private:
void update(const uint8_t input[], size_t length) override;
std::vector<uint8_t> raw_data() override;
std::vector<uint8_t> encoding_of(std::span<const uint8_t> msg,
size_t output_bits,
RandomNumberGenerator& rng) override;
bool verify(std::span<const uint8_t> coded, std::span<const uint8_t> raw, size_t key_bits) override;
std::unique_ptr<HashFunction> m_hash;
bool m_implicit;
size_t m_salt_len;
std::vector<uint8_t> m_msg_buffer;
};
/**
* ISO-9796-2 - Digital signature scheme 3 (deterministic)
*/
class ISO_9796_DS3 final : public SignaturePaddingScheme {
public:
/**
* @param hash function to use
* @param implicit whether or not the trailer is implicit
*/
explicit ISO_9796_DS3(std::unique_ptr<HashFunction> hash, bool implicit = false) :
m_hash(std::move(hash)), m_implicit(implicit) {}
std::string name() const override;
std::string hash_function() const override;
private:
void update(const uint8_t input[], size_t length) override;
std::vector<uint8_t> raw_data() override;
std::vector<uint8_t> encoding_of(std::span<const uint8_t> msg,
size_t output_bits,
RandomNumberGenerator& rng) override;
bool verify(std::span<const uint8_t> coded, std::span<const uint8_t> raw, size_t key_bits) override;
std::unique_ptr<HashFunction> m_hash;
bool m_implicit;
std::vector<uint8_t> m_msg_buffer;
};
} // namespace Botan
#endif