Id-based-Proxy-Signature-Scheme-with-Message-Recovery/shared_8h_source.html

#ifndef SHARED_H

#define SHARED_H


#include <string.h>

#include <assert.h>

#include <pbc/pbc.h>

#include <nettle/sha1.h>

#include <nettle/sha2.h>

#include "data.h"


unsigned int non_generic_dlog_secure_size_by_security_level(unsigned int sec_lvl);


uint16_t hash(uint8_t digest[MAX_DIGEST_SIZE], const void *data, size_t len, hash_type_t hash_type);


uint16_t hash_element(uint8_t digest[MAX_DIGEST_SIZE], element_t e, hash_type_t hash_type);


void hash_warrant_and_r(element_t h, element_t r, warrant_t m, hash_type_t hash_type);


void calculate_beta(uint8_t beta[], const uint8_t msg[], size_t msg_size, sv_public_params_t public_p);


void params_init(pbc_param_t pairings_p, int sec_lvl);


void setup(sv_public_params_t public_p, sv_secret_params_t secret_p, int sec_lvl, hash_type_t hash_type);


void setup_from_params(sv_public_params_t public_p, sv_secret_params_t secret_p, hash_type_t hash_type, pbc_param_t pairing_p);


void setup_from_str(sv_public_params_t public_p, sv_secret_params_t secret_p, char pairing_p_str[]);


void public_params_pp(sv_public_params_t public_p);


void extract_p(sv_user_t user, sv_public_params_t public_p);


void extract_s(sv_user_t user, sv_secret_params_t secret_p);


void delegate(delegation_t w, sv_user_t from, sv_user_t to, sv_public_params_t public_p);


int del_verify(delegation_t w, sv_public_params_t public_p);


void pk_gen(element_t k_sign, sv_user_t user, delegation_t w, sv_public_params_t public_p);


#endif // SHARED_H

data.h
Header file containing the data structures used by the scheme and the functions used to manage them.

hash
uint16_t hash(uint8_t digest[MAX_DIGEST_SIZE], const void *data, size_t len, hash_type_t hash_type)
Generate the digest of the data using the hash_type algorithm.
Definition: shared.c:18

hash_warrant_and_r
void hash_warrant_and_r(element_t h, element_t r, warrant_t m, hash_type_t hash_type)
hash both the warrant and the random value r and return the result in h, an element of Zq*.
Definition: shared.c:53

setup_from_params
void setup_from_params(sv_public_params_t public_p, sv_secret_params_t secret_p, hash_type_t hash_type, pbc_param_t pairing_p)
Initialization function for the scheme. It takes as input the hash function to use and the parameters...
Definition: shared.c:108

setup_from_str
void setup_from_str(sv_public_params_t public_p, sv_secret_params_t secret_p, char pairing_p_str[])
Initialization function for the scheme. It takes as input the string representation of the parameters...
Definition: shared.c:135

del_verify
int del_verify(delegation_t w, sv_public_params_t public_p)
Verifies the validity of a delegation. After receiving the delegation W = (m, r, S),...
Definition: shared.c:278

pk_gen
void pk_gen(element_t k_sign, sv_user_t user, delegation_t w, sv_public_params_t public_p)
Produces a proxy signing key from a delegation. If the delegate used accepts the delegation,...
Definition: shared.c:316

delegate
void delegate(delegation_t w, sv_user_t from, sv_user_t to, sv_public_params_t public_p)
Delegates the right to sign messages to the identity id. The original signer selects k in Zq* and com...
Definition: shared.c:233

extract_p
void extract_p(sv_user_t user, sv_public_params_t public_p)
Produces the public key pk_id from an identity. It uses the hash function H0 to map the any string {0...
Definition: shared.c:208

calculate_beta
void calculate_beta(uint8_t beta[], const uint8_t msg[], size_t msg_size, sv_public_params_t public_p)
Calculate the value of beta. Starting from the message to be signed and the public parameters of the ...
Definition: shared.c:64

non_generic_dlog_secure_size_by_security_level
unsigned int non_generic_dlog_secure_size_by_security_level(unsigned int sec_lvl)
Get the size of the non generic dlog secure size based on the NIST suggestions.
Definition: shared.c:3

extract_s
void extract_s(sv_user_t user, sv_secret_params_t secret_p)
Produces the secret key sk_id from an identity. It uses the hash function H0 to map the any string {0...
Definition: shared.c:218

params_init
void params_init(pbc_param_t pairings_p, int sec_lvl)
Initialize the pairings parameters.
Definition: shared.c:95

hash_element
uint16_t hash_element(uint8_t digest[MAX_DIGEST_SIZE], element_t e, hash_type_t hash_type)
Generate the digest of the element using the hash_type algorithm.
Definition: shared.c:45

public_params_pp
void public_params_pp(sv_public_params_t public_p)
Apply all possible precomputations on the public parameters.
Definition: shared.c:189

setup
void setup(sv_public_params_t public_p, sv_secret_params_t secret_p, int sec_lvl, hash_type_t hash_type)
Initialization function for the scheme. It takes as input a security parameter lambda and the hash fu...
Definition: shared.c:100