#ifndef _HP_CRYPTO_H_
#define _HP_CRYPTO_H_

#include <sodium.h>

/**
 * Offers convenience functions for cryptographic operations wrapping libsodium.
 * These functions are used for contract config and user/peer message authentication.
 */
namespace crypto
{

// Prefix byte to append to ed25519 keys.
static unsigned char KEYPFX_ed25519 = 0xED;
// Prefixed public key bytes.
static size_t PFXD_PUBKEY_BYTES = crypto_sign_PUBLICKEYBYTES + 1;
// Prefixed secret key bytes.
static size_t PFXD_SECKEY_BYTES = crypto_sign_SECRETKEYBYTES + 1;

int init();

void generate_signing_keys(std::string &pubkey, std::string &seckey);

std::string sign(std::string_view msg, std::string_view seckey);

std::string sign_hex(std::string_view msg, std::string_view seckeyhex);

int verify(std::string_view msg, std::string_view sig, std::string_view pubkey);

int verify_hex(std::string_view msg, std::string_view sighex, std::string_view pubkeyhex);

std::string sha_512_hash(std::string_view data);

} // namespace crypto

#endif