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keysubtracter.c
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keysubtracter.c
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/*
Develop by Luis Alberto
email: alberto.bsd@gmail.com
compile in the keyhunt directory
gcc -o keysubstracter keysubstracter.c -lgmp
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <gmp.h>
#include <string.h>
#include <unistd.h>
#include <math.h>
#include <time.h>
#include "util.h"
#include "gmpecc.h"
const char *version = "0.1";
const char *EC_constant_N = "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141";
const char *EC_constant_P = "fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f";
const char *EC_constant_Gx = "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798";
const char *EC_constant_Gy = "483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8";
void showhelp();
void set_bit(char *param);
void set_publickey(char *param);
void set_range(char *param);
char *str_output = NULL;
struct Point target_publickey,base_publickey,sum_publickey,negated_publickey,dst_publickey;
int FLAG_RANGE = 0;
int FLAG_BIT = 0;
int FLAG_RANDOM = 0;
int FLAG_PUBLIC = 0;
int FLAG_N;
uint64_t N = 0,M;
mpz_t min_range,max_range,diff,TWO,base_key,sum_key,dst_key;
gmp_randstate_t state;
int main(int argc, char **argv) {
FILE *OUTPUT;
char c;
uint64_t i = 0;
mpz_init_set_str(EC.p, EC_constant_P, 16);
mpz_init_set_str(EC.n, EC_constant_N, 16);
mpz_init_set_str(G.x , EC_constant_Gx, 16);
mpz_init_set_str(G.y , EC_constant_Gy, 16);
init_doublingG(&G);
mpz_init(min_range);
mpz_init(max_range);
mpz_init(diff);
mpz_init_set_ui(TWO,2);
mpz_init(target_publickey.x);
mpz_init_set_ui(target_publickey.y,0);
while ((c = getopt(argc, argv, "hvRb:n:o:p:r:")) != -1) {
switch(c) {
case 'h':
showhelp();
exit(0);
break;
case 'b':
set_bit((char *)optarg);
FLAG_BIT = 1;
break;
case 'n':
N = strtol((char *)optarg,NULL,10);
if(N<= 0) {
fprintf(stderr,"[E] invalid bit N number %s\n",optarg);
exit(0);
}
FLAG_N = 1;
break;
case 'o':
str_output = (char *)optarg;
break;
case 'p':
set_publickey((char *)optarg);
FLAG_PUBLIC = 1;
break;
case 'r':
set_range((char *)optarg);
FLAG_RANGE = 1;
break;
case 'R':
FLAG_RANDOM = 1;
break;
case 'v':
printf("version %s\n",version);
break;
}
}
if((FLAG_BIT || FLAG_RANGE) && FLAG_PUBLIC && FLAG_N) {
if(str_output) {
OUTPUT = fopen(str_output,"a");
if(OUTPUT == NULL) {
fprintf(stderr,"can't opent file %s\n",str_output);
OUTPUT = stdout;
}
}
else {
OUTPUT = stdout;
}
if(N % 2 == 1) {
N++;
}
M = N /2;
mpz_sub(diff,max_range,min_range);
mpz_init(base_publickey.x);
mpz_init(base_publickey.y);
mpz_init(sum_publickey.x);
mpz_init(sum_publickey.y);
mpz_init(negated_publickey.x);
mpz_init(negated_publickey.y);
mpz_init(dst_publickey.x);
mpz_init(dst_publickey.y);
mpz_init(base_key);
mpz_init(sum_key);
if(FLAG_RANDOM) {
gmp_randinit_mt(state);
gmp_randseed_ui(state, ((int)clock()) + ((int)time(NULL)) );
for(i = 0; i < M;i++) {
mpz_urandomm(base_key,state,diff);
Scalar_Multiplication(G,&base_publickey,base_key);
Point_Negation(&base_publickey,&negated_publickey);
Point_Addition(&base_publickey,&target_publickey,&dst_publickey);
if(mpz_tstbit(dst_publickey.y, 0) == 0) { // Even
gmp_fprintf(OUTPUT,"02%0.64Zx # - %Zd\n",dst_publickey.x,base_key);
}
else {
gmp_fprintf(OUTPUT,"03%0.64Zx # - %Zd\n",dst_publickey.x,base_key);
}
Point_Addition(&negated_publickey,&target_publickey,&dst_publickey);
if(mpz_tstbit(dst_publickey.y, 0) == 0) { // Even
gmp_fprintf(OUTPUT,"02%0.64Zx # + %Zd\n",dst_publickey.x,base_key);
}
else {
gmp_fprintf(OUTPUT,"03%0.64Zx # + %Zd\n",dst_publickey.x,base_key);
}
}
if(mpz_tstbit(target_publickey.y, 0) == 0) { // Even
gmp_fprintf(OUTPUT,"02%0.64Zx # target\n",target_publickey.x);
}
else {
gmp_fprintf(OUTPUT,"03%0.64Zx # target\n",target_publickey.x);
}
}
else {
mpz_cdiv_q_ui(base_key,diff,M);
Scalar_Multiplication(G,&base_publickey,base_key);
mpz_set(sum_publickey.x,base_publickey.x);
mpz_set(sum_publickey.y,base_publickey.y);
mpz_set(sum_key,base_key);
for(i = 0; i < M;i++) {
Point_Negation(&sum_publickey,&negated_publickey);
Point_Addition(&sum_publickey,&target_publickey,&dst_publickey);
if(mpz_tstbit(dst_publickey.y, 0) == 0) { // Even
gmp_fprintf(OUTPUT,"02%0.64Zx # - %Zd\n",dst_publickey.x,sum_key);
}
else {
gmp_fprintf(OUTPUT,"03%0.64Zx # - %Zd\n",dst_publickey.x,sum_key);
}
Point_Addition(&negated_publickey,&target_publickey,&dst_publickey);
if(mpz_tstbit(dst_publickey.y, 0) == 0) { // Even
gmp_fprintf(OUTPUT,"02%0.64Zx # + %Zd\n",dst_publickey.x,sum_key);
}
else {
gmp_fprintf(OUTPUT,"03%0.64Zx # + %Zd\n",dst_publickey.x,sum_key);
}
Point_Addition(&sum_publickey,&base_publickey,&dst_publickey);
mpz_set(sum_publickey.x,dst_publickey.x);
mpz_set(sum_publickey.y,dst_publickey.y);
mpz_add(sum_key,sum_key,base_key);
}
if(mpz_tstbit(target_publickey.y, 0) == 0) { // Even
gmp_fprintf(OUTPUT,"02%0.64Zx # target\n",target_publickey.x);
}
else {
gmp_fprintf(OUTPUT,"03%0.64Zx # target\n",target_publickey.x);
}
}
mpz_clear(base_publickey.x);
mpz_clear(base_publickey.y);
mpz_clear(sum_publickey.x);
mpz_clear(sum_publickey.y);
mpz_clear(negated_publickey.x);
mpz_clear(negated_publickey.y);
mpz_clear(dst_publickey.x);
mpz_clear(dst_publickey.y);
mpz_clear(base_key);
mpz_clear(sum_key);
}
else {
fprintf(stderr,"Version: %s\n",version);
fprintf(stderr,"[E] there are some missing parameter\n");
showhelp();
}
return 0;
}
void showhelp() {
printf("\nUsage:\n-h\t\tshow this help\n");
printf("-b bits\t\tFor some puzzles you only need a bit range\n");
printf("-n number\tNumber of publikeys to be geneted, this numbe will be even\n");
printf("-o file\tOutput file, if you omit this option the out will go to the standar output\n");
printf("-p key\tPublickey to be substracted compress or uncompress\n");
printf("-r A:B\t\trange A to B\n");
printf("-R\t\t\tSet the publickey substraction Random instead of secuential\n");
}
void set_bit(char *param) {
mpz_t MPZAUX;
int bitrange = strtol(param,NULL,10);
if(bitrange > 0 && bitrange <=256 ) {
mpz_init(MPZAUX);
mpz_pow_ui(MPZAUX,TWO,bitrange-1);
mpz_set(min_range,MPZAUX);
mpz_pow_ui(MPZAUX,TWO,bitrange);
mpz_sub_ui(MPZAUX,MPZAUX,1);
mpz_set(max_range,MPZAUX);
gmp_fprintf(stderr,"[+] Min range: %Zx\n",min_range);
gmp_fprintf(stderr,"[+] Max range: %Zx\n",max_range);
mpz_clear(MPZAUX);
}
else {
fprintf(stderr,"[E] invalid bit param: %s\n",param);
exit(0);
}
}
void set_publickey(char *param) {
char hexvalue[65];
char *dest;
int len;
len = strlen(param);
dest = (char*) calloc(len+1,1);
if(dest == NULL) {
fprintf(stderr,"[E] Error calloc\n");
exit(0);
}
memset(hexvalue,0,65);
memcpy(dest,param,len);
trim(dest," \t\n\r");
len = strlen(dest);
switch(len) {
case 66:
mpz_set_str(target_publickey.x,dest+2,16);
break;
case 130:
memcpy(hexvalue,dest+2,64);
mpz_set_str(target_publickey.x,hexvalue,16);
memcpy(hexvalue,dest+66,64);
mpz_set_str(target_publickey.y,hexvalue,16);
break;
}
if(mpz_cmp_ui(target_publickey.y,0) == 0) {
mpz_t mpz_aux,mpz_aux2,Ysquared;
mpz_init(mpz_aux);
mpz_init(mpz_aux2);
mpz_init(Ysquared);
mpz_pow_ui(mpz_aux,target_publickey.x,3);
mpz_add_ui(mpz_aux2,mpz_aux,7);
mpz_mod(Ysquared,mpz_aux2,EC.p);
mpz_add_ui(mpz_aux,EC.p,1);
mpz_fdiv_q_ui(mpz_aux2,mpz_aux,4);
mpz_powm(target_publickey.y,Ysquared,mpz_aux2,EC.p);
mpz_sub(mpz_aux, EC.p,target_publickey.y);
switch(dest[1]) {
case '2':
if(mpz_tstbit(target_publickey.y, 0) == 1) {
mpz_set(target_publickey.y,mpz_aux);
}
break;
case '3':
if(mpz_tstbit(target_publickey.y, 0) == 0) {
mpz_set(target_publickey.y,mpz_aux);
}
break;
default:
fprintf(stderr,"[E] Some invalid bit in the publickey: %s\n",dest);
exit(0);
break;
}
mpz_clear(mpz_aux);
mpz_clear(mpz_aux2);
mpz_clear(Ysquared);
}
free(dest);
}
void set_range(char *param) {
Tokenizer tk;
char *dest;
int len;
len = strlen(param);
dest = (char*) calloc(len+1,1);
if(dest == NULL) {
fprintf(stderr,"[E] Error calloc\n");
exit(0);
}
memcpy(dest,param,len);
dest[len] = '\0';
stringtokenizer(dest,&tk);
if(tk.n == 2) {
mpz_init_set_str(min_range,nextToken(&tk),16);
mpz_init_set_str(max_range,nextToken(&tk),16);
}
else {
fprintf(stderr,"%i\n",tk.n);
fprintf(stderr,"[E] Invalid range expected format A:B\n");
exit(0);
}
freetokenizer(&tk);
free(dest);
}