X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/d3c606574f90881daab8585659c18223a7a3c2c3..1511ea28a8cc647a6fc462e9c182622a43df1318:/client/emv/emv_roca.c
diff --git a/client/emv/emv_roca.c b/client/emv/emv_roca.c
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+/* roca.c - ROCA (CVE-2017-15361) fingerprint checker.
+ * Written by Rob Stradling (based on https://github.com/crocs-muni/roca/blob/master/roca/detect.py)
+ * Copyright (C) 2017-2018 Sectigo Limited
+ * modified 2018 iceman (dropped openssl bignum, now use mbedtls lib)
+ * modified 2018 merlok
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ */
+//-----------------------------------------------------------------------------
+// EMV roca commands
+//-----------------------------------------------------------------------------
+
+#include "emv_roca.h"
+
+#include
+#include
+#include
+
+#include "ui.h"
+#include "mbedtls/bignum.h"
+
+
+static uint8_t g_primes[ROCA_PRINTS_LENGTH] = {
+ 11, 13, 17, 19, 37, 53, 61, 71, 73, 79, 97, 103, 107, 109, 127, 151, 157
+};
+
+mbedtls_mpi g_prints[ROCA_PRINTS_LENGTH];
+
+void rocacheck_init(void) {
+
+ for (int i = 0; i < ROCA_PRINTS_LENGTH; i++)
+ mbedtls_mpi_init(&g_prints[i]);
+
+ mbedtls_mpi_read_string(&g_prints[0], 10, "1026");
+ mbedtls_mpi_read_string(&g_prints[1], 10, "5658");
+ mbedtls_mpi_read_string(&g_prints[2], 10, "107286");
+ mbedtls_mpi_read_string(&g_prints[3], 10, "199410");
+ mbedtls_mpi_read_string(&g_prints[4], 10, "67109890");
+ mbedtls_mpi_read_string(&g_prints[5], 10, "5310023542746834");
+ mbedtls_mpi_read_string(&g_prints[6], 10, "1455791217086302986");
+ mbedtls_mpi_read_string(&g_prints[7], 10, "20052041432995567486");
+ mbedtls_mpi_read_string(&g_prints[8], 10, "6041388139249378920330");
+ mbedtls_mpi_read_string(&g_prints[9], 10, "207530445072488465666");
+ mbedtls_mpi_read_string(&g_prints[10], 10, "79228162521181866724264247298");
+ mbedtls_mpi_read_string(&g_prints[11], 10, "1760368345969468176824550810518");
+ mbedtls_mpi_read_string(&g_prints[12], 10, "50079290986288516948354744811034");
+ mbedtls_mpi_read_string(&g_prints[13], 10, "473022961816146413042658758988474");
+ mbedtls_mpi_read_string(&g_prints[14], 10, "144390480366845522447407333004847678774");
+ mbedtls_mpi_read_string(&g_prints[15], 10, "1800793591454480341970779146165214289059119882");
+ mbedtls_mpi_read_string(&g_prints[16], 10, "126304807362733370595828809000324029340048915994");
+}
+
+void rocacheck_cleanup(void) {
+ for (int i = 0; i < ROCA_PRINTS_LENGTH; i++)
+ mbedtls_mpi_free(&g_prints[i]);
+}
+
+int bitand_is_zero( mbedtls_mpi* a, mbedtls_mpi* b ) {
+
+ for (int i = 0; i < mbedtls_mpi_bitlen(a); i++) {
+
+ if (mbedtls_mpi_get_bit(a, i) && mbedtls_mpi_get_bit(b, i))
+ return 0;
+ }
+ return 1;
+}
+
+
+mbedtls_mpi_uint mpi_get_uint(const mbedtls_mpi *X) {
+
+ if (X->n == 1 && X->s > 0) {
+ return X->p[0];
+ }
+ printf("ZERRRRO!!!\n");
+ return 0;
+}
+
+void print_mpi(const char *msg, int radix, const mbedtls_mpi *X) {
+
+ char Xchar[400] = {0};
+ size_t len = 0;
+
+ mbedtls_mpi_write_string(X, radix, Xchar, sizeof(Xchar), &len);
+ printf("%s[%zd] %s\n", msg, len, Xchar);
+}
+
+bool emv_rocacheck(const unsigned char *buf, size_t buflen, bool verbose) {
+
+ mbedtls_mpi t_modulus;
+ mbedtls_mpi_init(&t_modulus);
+
+ bool ret = false;
+
+ rocacheck_init();
+
+ MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary(&t_modulus, buf, buflen) );
+
+ for (int i = 0; i < ROCA_PRINTS_LENGTH; i++) {
+
+ mbedtls_mpi t_temp;
+ mbedtls_mpi t_prime;
+ mbedtls_mpi g_one;
+
+ mbedtls_mpi_init(&t_temp);
+ mbedtls_mpi_init(&t_prime);
+ mbedtls_mpi_init(&g_one);
+
+ MBEDTLS_MPI_CHK( mbedtls_mpi_read_string(&g_one, 10, "1") );
+
+ MBEDTLS_MPI_CHK( mbedtls_mpi_add_int(&t_prime, &t_prime, g_primes[i]) );
+
+ MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi(&t_temp, &t_modulus, &t_prime) );
+
+ MBEDTLS_MPI_CHK( mbedtls_mpi_shift_l(&g_one, mpi_get_uint(&t_temp)) );
+
+ if (bitand_is_zero(&g_one, &g_prints[i])) {
+ if (verbose)
+ PrintAndLogEx(FAILED, "No fingerprint found.\n");
+ goto cleanup;
+ }
+
+ mbedtls_mpi_free(&g_one);
+ mbedtls_mpi_free(&t_temp);
+ mbedtls_mpi_free(&t_prime);
+ }
+
+ ret = true;
+ if (verbose)
+ PrintAndLogEx(SUCCESS, "Fingerprint found!\n");
+
+cleanup:
+ mbedtls_mpi_free(&t_modulus);
+
+ rocacheck_cleanup();
+ return ret;
+}
+
+int roca_self_test( int verbose ) {
+ int ret = 0;
+
+ if( verbose != 0 )
+ printf( "\nROCA check vulnerability tests\n" );
+
+ // positive
+ uint8_t keyp[] = "\x94\x4e\x13\x20\x8a\x28\x0c\x37\xef\xc3\x1c\x31\x14\x48\x5e\x59"\
+ "\x01\x92\xad\xbb\x8e\x11\xc8\x7c\xad\x60\xcd\xef\x00\x37\xce\x99"\
+ "\x27\x83\x30\xd3\xf4\x71\xa2\x53\x8f\xa6\x67\x80\x2e\xd2\xa3\xc4"\
+ "\x4a\x8b\x7d\xea\x82\x6e\x88\x8d\x0a\xa3\x41\xfd\x66\x4f\x7f\xa7";
+
+ if( verbose != 0 )
+ printf( " ROCA positive test: " );
+
+ if (emv_rocacheck(keyp, 64, false)) {
+ if( verbose != 0 )
+ printf( "passed\n" );
+ } else {
+ ret = 1;
+ if( verbose != 0 )
+ printf( "failed\n" );
+ }
+
+ // negative
+ uint8_t keyn[] = "\x84\x4e\x13\x20\x8a\x28\x0c\x37\xef\xc3\x1c\x31\x14\x48\x5e\x59"\
+ "\x01\x92\xad\xbb\x8e\x11\xc8\x7c\xad\x60\xcd\xef\x00\x37\xce\x99"\
+ "\x27\x83\x30\xd3\xf4\x71\xa2\x53\x8f\xa6\x67\x80\x2e\xd2\xa3\xc4"\
+ "\x4a\x8b\x7d\xea\x82\x6e\x88\x8d\x0a\xa3\x41\xfd\x66\x4f\x7f\xa7";
+
+ if( verbose != 0 )
+ printf( " ROCA negative test: " );
+
+ if (emv_rocacheck(keyn, 64, false)) {
+ ret = 1;
+ if( verbose != 0 )
+ printf( "failed\n" );
+ } else {
+ if( verbose != 0 )
+ printf( "passed\n" );
+ }
+
+
+ return ret;
+}