mirror of
https://github.com/Next-Flip/Momentum-Firmware.git
synced 2026-04-25 03:29:58 -07:00
659 lines
19 KiB
C
659 lines
19 KiB
C
#include "mrtd_helpers.h"
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#include "../helpers/iso7816.h"
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#include <stdio.h> //TODO: remove
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#include <stdlib.h>
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#include <mbedtls/sha1.h>
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#include <mbedtls/des.h>
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static inline unsigned char* ucstr(const char* str) {
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return (unsigned char*)str;
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}
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const char* mrtd_auth_method_string(MrtdAuthMethod method) {
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switch(method) {
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case MrtdAuthMethodBac:
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return "BAC";
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case MrtdAuthMethodPace:
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return "PACE";
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case MrtdAuthMethodNone:
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return "None";
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case MrtdAuthMethodAny:
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return "Any";
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default:
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return "Unknown";
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}
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}
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bool mrtd_auth_method_parse_string(MrtdAuthMethod* method, const char* str) {
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if(!strcmp(str, "BAC")) {
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*method = MrtdAuthMethodBac;
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return true;
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}
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if(!strcmp(str, "PACE")) {
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*method = MrtdAuthMethodPace;
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return true;
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}
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if(!strcmp(str, "None")) {
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*method = MrtdAuthMethodNone;
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return true;
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}
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if(!strcmp(str, "Any")) {
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*method = MrtdAuthMethodAny;
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return true;
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}
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return false;
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}
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uint8_t mrtd_bac_check_digit(const char* input, const uint8_t length) {
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const uint8_t num_weights = 3;
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uint8_t weights[] = {7, 3, 1};
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uint8_t check_digit = 0;
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uint8_t idx;
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for(uint8_t i = 0; i < length; ++i) {
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char c = input[i];
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if(c >= 'A' && c <= 'Z') {
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idx = c - 'A' + 10;
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} else if(c >= 'a' && c <= 'z') {
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idx = c - 'a' + 10;
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} else if(c >= '0' && c <= '9') {
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idx = c - '0';
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} else {
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idx = 0;
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}
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check_digit = (check_digit + idx * weights[i % num_weights]) % 10;
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}
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return check_digit;
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}
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void mrtd_print_date(char* output, MrtdDate* date) {
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output[0] = (date->year / 10) + '0';
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output[1] = (date->year % 10) + '0';
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output[2] = (date->month / 10) + '0';
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output[3] = (date->month % 10) + '0';
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output[4] = (date->day / 10) + '0';
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output[5] = (date->day % 10) + '0';
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}
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uint8_t charval(char c) {
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if(c >= '0' && c <= '9') {
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return c - '0';
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}
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return 0;
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}
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void mrtd_parse_date(MrtdDate* date, const unsigned char* input) {
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date->year = charval(input[0]) * 10 + charval(input[1]);
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date->month = charval(input[2]) * 10 + charval(input[3]);
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date->day = charval(input[4]) * 10 + charval(input[5]);
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}
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bool mrtd_bac_get_kmrz(MrtdAuthData* auth, char* output, uint8_t output_size) {
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uint8_t idx = 0;
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uint8_t docnr_length = strlen(auth->doc_number);
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uint8_t cd_idx = 0;
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if(output_size < docnr_length + 16) {
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return false;
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}
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cd_idx = idx;
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for(uint8_t i = 0; i < docnr_length; ++i) {
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char c = auth->doc_number[i];
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if(c >= 'a' && c <= 'z') {
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c = c - 'a' + 'A';
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}
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output[idx++] = c;
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}
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if(docnr_length < 9) {
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memset(output + idx, '<', 9 - docnr_length);
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idx += 9 - docnr_length;
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}
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output[idx++] = mrtd_bac_check_digit(output + cd_idx, docnr_length) + '0';
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cd_idx = idx;
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mrtd_print_date(output + idx, &auth->birth_date);
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idx += 6;
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output[idx++] = mrtd_bac_check_digit(output + cd_idx, 6) + '0';
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cd_idx = idx;
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mrtd_print_date(output + idx, &auth->expiry_date);
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idx += 6;
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output[idx++] = mrtd_bac_check_digit(output + cd_idx, 6) + '0';
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output[idx++] = '\x00';
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return true;
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}
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bool mrtd_bac_keys_from_seed(const uint8_t kseed[16], uint8_t ksenc[16], uint8_t ksmac[16]) {
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uint8_t hash[20];
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mbedtls_sha1_context ctx;
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mbedtls_sha1_init(&ctx);
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do {
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for(uint8_t i = 1; i <= 2; ++i) {
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if(mbedtls_sha1_starts(&ctx)) break;
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if(mbedtls_sha1_update(&ctx, kseed, 16)) break;
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if(mbedtls_sha1_update(&ctx, ucstr("\x00\x00\x00"), 3)) break;
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if(mbedtls_sha1_update(&ctx, &i, 1)) break;
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if(mbedtls_sha1_finish(&ctx, hash)) break;
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switch(i) {
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case 1:
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memcpy(ksenc, hash, 16);
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mbedtls_des_key_set_parity(ksenc);
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mbedtls_des_key_set_parity(ksenc + 8);
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break;
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case 2:
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memcpy(ksmac, hash, 16);
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mbedtls_des_key_set_parity(ksmac);
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mbedtls_des_key_set_parity(ksmac + 8);
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break;
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}
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}
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} while(false);
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mbedtls_sha1_free(&ctx);
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return true;
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}
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bool mrtd_bac_keys(MrtdAuthData* auth, uint8_t ksenc[16], uint8_t ksmac[16]) {
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uint8_t kmrz_max_length = MRTD_DOCNR_MAX_LENGTH + 16;
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char kmrz[kmrz_max_length];
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if(!mrtd_bac_get_kmrz(auth, kmrz, kmrz_max_length)) {
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return false;
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}
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printf("kmrz: %s\r\n", kmrz); //TODO: remove
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uint8_t hash[20];
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mbedtls_sha1((uint8_t*)kmrz, strlen(kmrz), hash);
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if(!mrtd_bac_keys_from_seed(hash, ksenc, ksmac)) {
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return false;
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}
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return true;
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}
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//NOTE: output size will be ((data_length+8)/8)*8
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bool mrtd_bac_encrypt(const uint8_t* data, size_t data_length, const uint8_t* key, uint8_t* output) {
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uint8_t IV[8] = "\x00\x00\x00\x00\x00\x00\x00\x00";
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mbedtls_des3_context ctx;
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mbedtls_des3_init(&ctx);
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mbedtls_des3_set2key_enc(&ctx, key);
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if(mbedtls_des3_crypt_cbc(&ctx, MBEDTLS_DES_ENCRYPT, data_length, IV, data, output)) {
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return false;
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}
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mbedtls_des3_free(&ctx);
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return true;
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}
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bool mrtd_bac_decrypt(const uint8_t* data, size_t data_length, uint8_t* key, uint8_t* output) {
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uint8_t IV[8] = "\x00\x00\x00\x00\x00\x00\x00\x00";
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mbedtls_des3_context ctx;
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mbedtls_des3_init(&ctx);
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mbedtls_des3_set2key_dec(&ctx, key);
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if(mbedtls_des3_crypt_cbc(&ctx, MBEDTLS_DES_DECRYPT, data_length, IV, data, output)) {
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return false;
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}
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mbedtls_des3_free(&ctx);
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return true;
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}
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bool mrtd_bac_decrypt_verify(
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const uint8_t* data,
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size_t data_length,
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uint8_t* key_enc,
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uint8_t* key_mac,
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uint8_t* output) {
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mrtd_bac_decrypt(data, data_length - 8, key_enc, output);
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uint8_t mac_calc[8];
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mrtd_bac_padded_mac(data, data_length - 8, key_mac, mac_calc);
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if(memcmp(mac_calc, data + data_length - 8, 8)) {
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printf("MAC failed\r\n");
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for(uint8_t i = 0; i < 8; ++i) {
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printf("%02X <=> %02X\r\n", mac_calc[i], data[data_length - 8 + i]);
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}
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return false;
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}
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return true;
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}
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// If output or output_written are NULL-pointers, no output is written
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// Otherwise, and if DO'87 is present, data is written to *output
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// output should have enough room for additional padding (rounded up by 8 bytes)
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// output_written will be the length without padding
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uint16_t mrtd_bac_decrypt_verify_sm(
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const uint8_t* data,
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size_t data_length,
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uint8_t* key_enc,
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uint8_t* key_mac,
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uint64_t ssc,
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uint8_t* output,
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size_t* output_written) {
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// Message: [DO'85 or DO'87] || [DO'99] || DO'8E
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// Lengths: Var 1+1+2=4 1+1+8=10
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//TODO: check for DO'99 presence, instead of assuming
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uint16_t ret_code = data[data_length - 10 - 2] << 8 | data[data_length - 10 - 1];
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//ntohs(data + data_length - 10 - 2);
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TlvInfo do87 = iso7816_tlv_select(data, data_length, (uint16_t[]){0x87}, 1);
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//printf("DO87.Tag: %X\n", do87.tag);
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//printf("DO87.Length: %ld\n", do87.length);
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//printf("DO87.Value: ");
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//for(uint8_t i=1; i<do87.length; ++i) { printf("%02X ", do87.value[i]); }
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//printf("\r\n");
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if(do87.tag) {
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if(output_written != NULL && output != NULL) {
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// Skip the first byte '01'
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const uint8_t* encdata = do87.value + 1;
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size_t enclength = do87.length - 1;
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mrtd_bac_decrypt(encdata, enclength, key_enc, output);
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printf("Decrypted: ");
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for(uint8_t i = 0; i < enclength; ++i) printf("%02X ", output[i]);
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printf("\r\n");
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//TODO: function mrtd_bac_unpad?
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int padidx;
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for(padidx = enclength - 1; padidx >= 0; --padidx) {
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if(output[padidx] == 0x00) {
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continue;
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} else if(output[padidx] == 0x80) {
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break;
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} else {
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printf("Invalid padding\r\n");
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return 0xff01;
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}
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}
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printf(" ");
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for(int i = 0; i < padidx; ++i) {
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printf(" ");
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}
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printf("^^\r\n");
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printf("Pad starts at: %d\r\n", padidx);
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*output_written = padidx - 1;
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}
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} else {
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if(output_written != NULL) {
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*output_written = 0;
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}
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}
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mrtd_bac_mac_ctx ctx;
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mrtd_bac_mac_init(&ctx, key_mac);
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uint64_t ssc_n = htonll(ssc);
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mrtd_bac_mac_update(&ctx, (uint8_t*)&ssc_n, 8);
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mrtd_bac_mac_update(
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&ctx, data, data_length - 10); // 10 = len(DO'8E) = len(header + length + MAC) = 1 + 1 + 8
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uint8_t mac_calc[8];
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mrtd_bac_mac_finalize(&ctx, mac_calc);
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if(memcmp(mac_calc, data + data_length - 8, 8)) {
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printf("SM MAC failed\r\n");
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for(uint8_t i = 0; i < 8; ++i) {
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printf("%02X <=> %02X\r\n", mac_calc[i], data[data_length - 8 + i]);
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}
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return 0xff02;
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}
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return ret_code;
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}
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bool mrtd_bac_mac_init(mrtd_bac_mac_ctx* ctx, const uint8_t key[16]) {
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mbedtls_des_init(&ctx->des);
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mbedtls_des_setkey_enc(&ctx->des, key);
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memset(ctx->mac, 0, 8);
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ctx->idx_in = 0;
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memcpy(ctx->key, key, 16);
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return true;
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}
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bool mrtd_bac_mac_update(mrtd_bac_mac_ctx* ctx, const uint8_t* data, size_t data_length) {
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//printf("MAC add %d: ", data_length); print_hex(data, data_length); printf("\n");
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size_t data_idx = 0;
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//uint8_t* xormac = ctx->xormac;
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if(ctx->idx_in != 0) {
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uint8_t buff_add = 8 - ctx->idx_in;
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if(data_length < buff_add) {
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buff_add = data_length;
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}
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memcpy(ctx->buffer_in + ctx->idx_in, data, buff_add);
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ctx->idx_in = (ctx->idx_in + buff_add) % 8;
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data_idx += buff_add;
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if(ctx->idx_in == 0) { // buffer_in filled
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for(uint8_t j = 0; j < 8; ++j) {
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ctx->xormac[j] = ctx->mac[j] ^ ctx->buffer_in[j];
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}
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mbedtls_des_crypt_ecb(&ctx->des, ctx->xormac, ctx->mac);
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printf(
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"DES buf: %02X %02X %02X %02X %02X %02X %02X %02X\r\n",
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ctx->buffer_in[0],
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ctx->buffer_in[1],
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ctx->buffer_in[2],
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ctx->buffer_in[3],
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ctx->buffer_in[4],
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ctx->buffer_in[5],
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ctx->buffer_in[6],
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ctx->buffer_in[7]);
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//printf("DES1: %02X %02X %02X %02X %02X %02X %02X %02X\n",
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//xormac[0], xormac[1], xormac[2], xormac[3],
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//xormac[4], xormac[5], xormac[6], xormac[7]);
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}
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}
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while(true) {
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if(data_idx + 8 > data_length) {
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// Not a full block
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break;
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}
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for(uint8_t j = 0; j < 8; ++j) {
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ctx->xormac[j] = ctx->mac[j] ^ data[data_idx++];
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}
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mbedtls_des_crypt_ecb(&ctx->des, ctx->xormac, ctx->mac);
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printf(
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"DES add: %02X %02X %02X %02X %02X %02X %02X %02X\r\n",
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data[data_idx - 8 + 0],
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data[data_idx - 8 + 1],
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data[data_idx - 8 + 2],
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data[data_idx - 8 + 3],
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data[data_idx - 8 + 4],
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data[data_idx - 8 + 5],
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data[data_idx - 8 + 6],
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data[data_idx - 8 + 7]);
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//printf("DES1: %02X %02X %02X %02X %02X %02X %02X %02X\n",
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//xormac[0], xormac[1], xormac[2], xormac[3],
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//xormac[4], xormac[5], xormac[6], xormac[7]);
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}
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if(data_idx < data_length) {
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ctx->idx_in = data_length - data_idx;
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memcpy(ctx->buffer_in, data + data_idx, ctx->idx_in);
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}
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return true;
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}
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bool mrtd_bac_mac_pad(mrtd_bac_mac_ctx* ctx) {
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memset(ctx->buffer_in + ctx->idx_in, 0x00, 8 - ctx->idx_in);
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ctx->buffer_in[ctx->idx_in] = 0x80;
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ctx->idx_in = 8;
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mrtd_bac_mac_update(ctx, NULL, 0); // Force processing the buffer_in
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return true;
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}
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bool mrtd_bac_mac_finalize(mrtd_bac_mac_ctx* ctx, uint8_t output[8]) {
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mrtd_bac_mac_pad(ctx);
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uint8_t tmp[8];
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mbedtls_des_init(&ctx->des);
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mbedtls_des_setkey_dec(&ctx->des, ctx->key + 8);
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mbedtls_des_crypt_ecb(&ctx->des, ctx->mac, tmp);
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mbedtls_des_init(&ctx->des);
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mbedtls_des_setkey_enc(&ctx->des, ctx->key);
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mbedtls_des_crypt_ecb(&ctx->des, tmp, output);
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mbedtls_des_free(&ctx->des);
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return true;
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}
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bool mrtd_bac_mac(const uint8_t* data, size_t data_length, const uint8_t* key, uint8_t* output) {
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// MAC
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uint8_t mac[8];
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uint8_t xormac[8];
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uint8_t tmp[8];
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mbedtls_des_context ctx;
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mbedtls_des_init(&ctx);
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mbedtls_des_setkey_enc(&ctx, key);
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memset(mac, 0, 8);
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for(size_t i = 0; i < data_length / 8; ++i) {
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for(uint8_t j = 0; j < 8; ++j) {
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xormac[j] = mac[j] ^ data[i * 8 + j];
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}
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mbedtls_des_crypt_ecb(&ctx, xormac, mac);
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printf(
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"DES1: %02X %02X %02X %02X %02X %02X %02X %02X\r\n",
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xormac[0],
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xormac[1],
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xormac[2],
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xormac[3],
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xormac[4],
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xormac[5],
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xormac[6],
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xormac[7]);
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}
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mbedtls_des_init(&ctx);
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mbedtls_des_setkey_dec(&ctx, key + 8);
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mbedtls_des_crypt_ecb(&ctx, mac, tmp);
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mbedtls_des_init(&ctx);
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mbedtls_des_setkey_enc(&ctx, key);
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mbedtls_des_crypt_ecb(&ctx, tmp, output);
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mbedtls_des_free(&ctx);
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|
|
|
return true;
|
|
}
|
|
|
|
bool mrtd_bac_padded_mac(const uint8_t* data, size_t data_length, uint8_t* key, uint8_t* output) {
|
|
//TODO: bufferless padding should be possible with 3DES
|
|
size_t newlength = ((data_length + 8) / 8) * 8; // TODO: return this value too?
|
|
uint8_t padded[newlength]; //TODO: input parameter
|
|
memset(padded, 0, newlength);
|
|
memcpy(padded, data, data_length);
|
|
padded[data_length] = 0x80;
|
|
|
|
if(!mrtd_bac_mac(padded, newlength, key, output)) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
size_t mrtd_protect_apdu(
|
|
uint8_t cla,
|
|
uint8_t ins,
|
|
uint8_t p1,
|
|
uint8_t p2,
|
|
uint8_t lc,
|
|
const void* data,
|
|
int16_t le,
|
|
const uint8_t* key_enc,
|
|
const uint8_t* key_mac,
|
|
uint64_t ssc,
|
|
uint8_t* output) {
|
|
//TODO: max size on output?
|
|
size_t idx = 0;
|
|
|
|
// CC = MAC( SSC || CmdHeader || DO'87 )
|
|
mrtd_bac_mac_ctx mac_ctx;
|
|
mrtd_bac_mac_init(&mac_ctx, key_mac);
|
|
uint64_t ssc_n = htonll(ssc);
|
|
//printf("ssc: %016llx\r\n", ssc);
|
|
//printf("ssc_n: "); print_hex(ssc_n, 8); printf("\n");
|
|
mrtd_bac_mac_update(&mac_ctx, (uint8_t*)&ssc_n, 8);
|
|
|
|
// Mask cla
|
|
output[idx++] = cla | 0x0c;
|
|
output[idx++] = ins;
|
|
output[idx++] = p1;
|
|
output[idx++] = p2;
|
|
|
|
// Pad Header
|
|
mrtd_bac_mac_update(&mac_ctx, output, idx);
|
|
mrtd_bac_mac_pad(&mac_ctx);
|
|
|
|
size_t idx_lc = idx;
|
|
output[idx++] = 0xff; // place holder for Lc
|
|
|
|
// Build DO'87
|
|
// TODO: condition on data presence
|
|
// TODO: if ins is odd, use 0x85
|
|
if(lc > 0) {
|
|
size_t newlength = ((lc + 8) / 8) * 8;
|
|
uint8_t padded[newlength];
|
|
|
|
output[idx++] = 0x87; // Header
|
|
output[idx++] = newlength + 1; // Length
|
|
output[idx++] = 0x01; //TODO: check this value
|
|
|
|
memset(padded, 0, newlength);
|
|
memcpy(padded, data, lc);
|
|
padded[lc] = 0x80;
|
|
|
|
mrtd_bac_encrypt(padded, newlength, key_enc, output + idx);
|
|
idx += newlength;
|
|
}
|
|
|
|
// Build DO'97
|
|
if(le >= 0) {
|
|
output[idx++] = 0x97; // Header
|
|
output[idx++] = 0x01; // Length
|
|
output[idx++] = le;
|
|
}
|
|
|
|
mrtd_bac_mac_update(&mac_ctx, output + idx_lc + 1, idx - idx_lc - 1);
|
|
|
|
// Build DO'8E
|
|
// TODO: conditions?
|
|
{
|
|
output[idx++] = 0x8E; // Header
|
|
output[idx++] = 0x08; // Length
|
|
|
|
mrtd_bac_mac_finalize(&mac_ctx, output + idx);
|
|
idx += 8;
|
|
|
|
printf("MAC: ");
|
|
for(uint8_t i = 0; i < 8; ++i) {
|
|
printf("%02X ", output[idx - 8 + i]);
|
|
}
|
|
printf("\r\n");
|
|
}
|
|
|
|
output[idx_lc] = idx - idx_lc - 1; // Set Lc
|
|
|
|
output[idx++] = 0x00;
|
|
|
|
return idx;
|
|
}
|
|
|
|
EFFile EFNone = {.name = NULL, .file_id = 0x0000, .short_id = 0x00, .tag = 0x00};
|
|
|
|
const struct EFFormat EF = {
|
|
.ATR = {.name = "ATR", .file_id = 0x2F01, .short_id = 0x01},
|
|
.DIR = {.name = "DIR", .file_id = 0x2F00, .short_id = 0x1E},
|
|
.CardAccess = {.name = "CardAccess", .file_id = 0x011C, .short_id = 0x1C},
|
|
.CardSecurity = {.name = "CardSecurity", .file_id = 0x011D, .short_id = 0x1D},
|
|
.COM = {.name = "COM", .file_id = 0x011E, .short_id = 0x1E, .tag = 0x60},
|
|
.SOD = {.name = "SOD", .file_id = 0X011D, .short_id = 0X1D, .tag = 0x77},
|
|
.DG1 = {.name = "DG1", .file_id = 0X0101, .short_id = 0X01, .tag = 0x61},
|
|
.DG2 = {.name = "DG2", .file_id = 0X0102, .short_id = 0X02, .tag = 0x75},
|
|
.DG3 = {.name = "DG3", .file_id = 0X0103, .short_id = 0X03, .tag = 0x63},
|
|
.DG4 = {.name = "DG4", .file_id = 0X0104, .short_id = 0X04, .tag = 0x76},
|
|
.DG5 = {.name = "DG5", .file_id = 0X0105, .short_id = 0X05, .tag = 0x65},
|
|
.DG6 = {.name = "DG6", .file_id = 0X0106, .short_id = 0X06, .tag = 0x66},
|
|
.DG7 = {.name = "DG7", .file_id = 0X0107, .short_id = 0X07, .tag = 0x67},
|
|
.DG8 = {.name = "DG8", .file_id = 0X0108, .short_id = 0X08, .tag = 0x68},
|
|
.DG9 = {.name = "DG9", .file_id = 0X0109, .short_id = 0X09, .tag = 0x69},
|
|
.DG10 = {.name = "DG10", .file_id = 0X010A, .short_id = 0X0A, .tag = 0x6a},
|
|
.DG11 = {.name = "DG11", .file_id = 0X010B, .short_id = 0X0B, .tag = 0x6b},
|
|
.DG12 = {.name = "DG12", .file_id = 0X010C, .short_id = 0X0C, .tag = 0x6c},
|
|
.DG13 = {.name = "DG13", .file_id = 0X010D, .short_id = 0X0D, .tag = 0x6d},
|
|
.DG14 = {.name = "DG14", .file_id = 0X010E, .short_id = 0X0E, .tag = 0x6e},
|
|
.DG15 = {.name = "DG15", .file_id = 0X010F, .short_id = 0X0F, .tag = 0x6f},
|
|
.DG16 = {.name = "DG16", .file_id = 0X0110, .short_id = 0X10, .tag = 0x70},
|
|
};
|
|
|
|
struct AIDSet AID = {
|
|
.eMRTDApplication = {0xA0, 0x00, 0x00, 0x02, 0x47, 0x10, 0x01},
|
|
.TravelRecords = {0xA0, 0x00, 0x00, 0x02, 0x47, 0x20, 0x01},
|
|
.VisaRecords = {0xA0, 0x00, 0x00, 0x02, 0x47, 0x20, 0x02},
|
|
.AdditionalBiometrics = {0xA0, 0x00, 0x00, 0x02, 0x47, 0x20, 0x03},
|
|
};
|
|
|
|
const EFFile* mrtd_tag_to_file(uint8_t tag) {
|
|
//TODO: generate this code with macros?
|
|
switch(tag) {
|
|
case 0x60:
|
|
return &EF.COM;
|
|
case 0x77:
|
|
return &EF.SOD;
|
|
case 0x61:
|
|
return &EF.DG1;
|
|
case 0x75:
|
|
return &EF.DG2;
|
|
case 0x63:
|
|
return &EF.DG3;
|
|
case 0x76:
|
|
return &EF.DG4;
|
|
case 0x65:
|
|
return &EF.DG5;
|
|
case 0x66:
|
|
return &EF.DG6;
|
|
case 0x67:
|
|
return &EF.DG7;
|
|
case 0x68:
|
|
return &EF.DG8;
|
|
case 0x69:
|
|
return &EF.DG9;
|
|
case 0x6a:
|
|
return &EF.DG10;
|
|
case 0x6b:
|
|
return &EF.DG11;
|
|
case 0x6c:
|
|
return &EF.DG12;
|
|
case 0x6d:
|
|
return &EF.DG13;
|
|
case 0x6e:
|
|
return &EF.DG14;
|
|
case 0x6f:
|
|
return &EF.DG15;
|
|
case 0x70:
|
|
return &EF.DG16;
|
|
default:
|
|
return &EFNone;
|
|
}
|
|
};
|
|
|
|
int tlv_number(TlvInfo tlv) {
|
|
//TODO: negative numbers?
|
|
const uint8_t* str = tlv.value;
|
|
size_t length = tlv.length;
|
|
|
|
int value = 0;
|
|
while(length--) {
|
|
char c = *(str++);
|
|
|
|
if(c >= '0' && c <= '9') {
|
|
value = value * 10 + (c - '0');
|
|
} else {
|
|
//TODO: warning? return? crash?
|
|
}
|
|
}
|
|
return value;
|
|
}
|