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/*
* PSSR
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_PSSR_H_
#define BOTAN_PSSR_H_
#include <botan/internal/emsa.h>
#include <botan/hash.h>
namespace Botan {
/**
* PSSR (called EMSA4 in IEEE 1363 and in old versions of the library)
*/
class PSSR final : public EMSA
{
public:
/**
* @param hash the hash function to use
*/
explicit PSSR(std::unique_ptr<HashFunction> hash);
/**
* @param hash the hash function to use
* @param salt_size the size of the salt to use in bytes
*/
PSSR(std::unique_ptr<HashFunction> hash, size_t salt_size);
std::unique_ptr<EMSA> new_object() override;
std::string name() const override;
AlgorithmIdentifier config_for_x509(const Private_Key& key,
const std::string& cert_hash_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;
size_t m_salt_size;
bool m_required_salt_len;
};
/**
* PSSR_Raw
* This accepts a pre-hashed buffer
*/
class PSSR_Raw final : public EMSA
{
public:
/**
* @param hash the hash function to use
*/
explicit PSSR_Raw(std::unique_ptr<HashFunction> hash);
/**
* @param hash the hash function to use
* @param salt_size the size of the salt to use in bytes
*/
PSSR_Raw(std::unique_ptr<HashFunction> hash, size_t 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;
secure_vector<uint8_t> m_msg;
size_t m_salt_size;
bool m_required_salt_len;
};
}
#endif
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