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/*
* RTSS (threshold secret sharing)
* (C) 2009,2018 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_RTSS_H_
#define BOTAN_RTSS_H_
#include <botan/secmem.h>
#include <string>
#include <vector>
namespace Botan {
class RandomNumberGenerator;
/**
* A split secret, using the format from draft-mcgrew-tss-03
*/
class BOTAN_PUBLIC_API(2,0) RTSS_Share final
{
public:
/**
* @param M the number of shares needed to reconstruct
* @param N the number of shares generated
* @param secret the secret to split
* @param secret_len the length of the secret
* @param identifier the 16 byte share identifier
* @param rng the random number generator to use
*/
static std::vector<RTSS_Share>
split(uint8_t M, uint8_t N,
const uint8_t secret[], uint16_t secret_len,
const uint8_t identifier[16],
RandomNumberGenerator& rng);
/**
* @param M the number of shares needed to reconstruct
* @param N the number of shares generated
* @param secret the secret to split
* @param secret_len the length of the secret
* @param identifier the share identifier
* @param hash_fn the hash function to use for a checksum ("None", "SHA-1", "SHA-256")
* @param rng the random number generator to use
*/
static std::vector<RTSS_Share>
split(uint8_t M, uint8_t N,
const uint8_t secret[], uint16_t secret_len,
const std::vector<uint8_t>& identifier,
const std::string& hash_fn,
RandomNumberGenerator& rng);
/**
* @param shares the list of shares
*/
static secure_vector<uint8_t>
reconstruct(const std::vector<RTSS_Share>& shares);
RTSS_Share() = default;
/**
* @param hex_input the share encoded in hexadecimal
*/
explicit RTSS_Share(const std::string& hex_input);
/**
* @param data the shared data
* @param len the length of data
*/
RTSS_Share(const uint8_t data[], size_t len);
/**
* @return binary representation
*/
const secure_vector<uint8_t>& data() const { return m_contents; }
/**
* @return hex representation
*/
std::string to_string() const;
/**
* @return share identifier
*/
uint8_t share_id() const;
/**
* @return size of this share in bytes
*/
size_t size() const { return m_contents.size(); }
/**
* @return if this TSS share was initialized or not
*/
bool initialized() const { return (m_contents.size() > 0); }
private:
secure_vector<uint8_t> m_contents;
};
}
#endif
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