2018-12-28 19:46:52 +08:00
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/* roca.c - ROCA (CVE-2017-15361) fingerprint checker.
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* Written by Rob Stradling (based on https://github.com/crocs-muni/roca/blob/master/roca/detect.py)
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* Copyright (C) 2017 COMODO CA Limited
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "emv_roca.h"
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static uint8_t g_primes[ROCA_PRINTS_LENGTH] = {
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11, 13, 17, 19, 37, 53, 61, 71, 73, 79, 97, 103, 107, 109, 127, 151, 157
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};
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mbedtls_mpi* g_prints[ROCA_PRINTS_LENGTH];
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void rocacheck_init(void) {
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for (uint8_t i = 0; i < ROCA_PRINTS_LENGTH; i++)
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mbedtls_mpi_init(g_prints[i]);
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mbedtls_mpi_read_string(g_prints[0], 10, "1026");
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mbedtls_mpi_read_string(g_prints[1], 10, "5658");
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mbedtls_mpi_read_string(g_prints[2], 10, "107286");
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mbedtls_mpi_read_string(g_prints[3], 10, "199410");
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mbedtls_mpi_read_string(g_prints[4], 10, "67109890");
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mbedtls_mpi_read_string(g_prints[5], 10, "5310023542746834");
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mbedtls_mpi_read_string(g_prints[6], 10, "1455791217086302986");
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mbedtls_mpi_read_string(g_prints[7], 10, "20052041432995567486");
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mbedtls_mpi_read_string(g_prints[8], 10, "6041388139249378920330");
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mbedtls_mpi_read_string(g_prints[9], 10, "207530445072488465666");
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mbedtls_mpi_read_string(g_prints[10], 10, "79228162521181866724264247298");
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mbedtls_mpi_read_string(g_prints[11], 10, "1760368345969468176824550810518");
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mbedtls_mpi_read_string(g_prints[12], 10, "50079290986288516948354744811034");
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mbedtls_mpi_read_string(g_prints[13], 10, "473022961816146413042658758988474");
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mbedtls_mpi_read_string(g_prints[14], 10, "144390480366845522447407333004847678774");
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mbedtls_mpi_read_string(g_prints[15], 10, "1800793591454480341970779146165214289059119882");
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mbedtls_mpi_read_string(g_prints[16], 10, "126304807362733370595828809000324029340048915994");
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}
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void rocacheck_cleanup(void) {
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for (uint8_t i = 0; i < ROCA_PRINTS_LENGTH; i++)
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mbedtls_mpi_free(g_prints[i]);
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}
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int bitand_is_zero( mbedtls_mpi* a, mbedtls_mpi* b ) {
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for (int i = 0; i < mbedtls_mpi_bitlen(a); i++) {
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if (mbedtls_mpi_get_bit(a, i) && mbedtls_mpi_get_bit(b, i))
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return 0;
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}
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return 1;
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}
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2018-12-28 20:50:23 +08:00
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mbedtls_mpi_uint mpi_get_uint(const mbedtls_mpi *X) {
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2018-12-28 20:52:24 +08:00
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if (X->n == 1 && X->s > 0) {
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2018-12-28 20:50:23 +08:00
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return X->p[0];
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}
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return 0;
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}
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2018-12-28 19:46:52 +08:00
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bool emv_rocacheck(char *modulus) {
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mbedtls_mpi *t_modulus = NULL;
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mbedtls_mpi_init(t_modulus);
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bool ret = true;
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rocacheck_init();
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//
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MBEDTLS_MPI_CHK( mbedtls_mpi_read_string(t_modulus, 10, modulus) );
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for (int i = 0; i < ROCA_PRINTS_LENGTH; i++) {
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mbedtls_mpi* t_temp = NULL;
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mbedtls_mpi* t_prime = NULL;
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mbedtls_mpi* g_one = NULL;
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mbedtls_mpi_init(g_one);
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mbedtls_mpi_init(t_temp);
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mbedtls_mpi_init(t_prime);
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MBEDTLS_MPI_CHK( mbedtls_mpi_read_string(g_one, 10, "1") );
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MBEDTLS_MPI_CHK( mbedtls_mpi_add_int(t_prime, t_prime, g_primes[i]) );
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MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi(t_temp, t_modulus, t_prime) );
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2018-12-28 20:50:23 +08:00
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MBEDTLS_MPI_CHK( mbedtls_mpi_shift_l(g_one, mpi_get_uint(t_temp)) );
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2018-12-28 19:46:52 +08:00
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if (bitand_is_zero(t_temp, g_prints[i])) {
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PrintAndLogEx(FAILED, "No fingerprint found\n");
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ret = false;
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goto cleanup;
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}
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mbedtls_mpi_free(g_one);
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mbedtls_mpi_free(t_temp);
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mbedtls_mpi_free(t_prime);
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}
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PrintAndLogEx(SUCCESS, "Fingerprint found!\n");
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cleanup:
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if (t_modulus)
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mbedtls_mpi_free(t_modulus);
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rocacheck_cleanup();
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return ret;
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}
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