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/*
* (C) 2023 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_RAW_HASH_FN_H_
#define BOTAN_RAW_HASH_FN_H_
#include <botan/hash.h>
#include <memory>
namespace Botan {
/**
* This is not an actual hash function; it simply emits as the "hash"
* the value it is given as input. This is useful when implementing
* certain protocols where the hash is provided externally somehow to
* the unit which is generating the signature.
*
* This is exposed as the "Raw" padding scheme for signatures.
*/
class RawHashFunction final : public HashFunction {
public:
RawHashFunction(std::unique_ptr<HashFunction> hash) : RawHashFunction(hash->name(), hash->output_length()) {}
RawHashFunction(std::string_view name, size_t output_length) : m_name(name), m_output_length(output_length) {}
void add_data(std::span<const uint8_t> input) override;
void final_result(std::span<uint8_t> out) override;
void clear() override;
std::unique_ptr<HashFunction> copy_state() const override;
std::unique_ptr<HashFunction> new_object() const override;
size_t output_length() const override;
std::string name() const override { return m_name; }
private:
const std::string m_name;
const size_t m_output_length;
std::vector<uint8_t> m_bits;
};
} // namespace Botan
#endif