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010c8018ea
pico-hsm/sc_hsm.c
Pol Henarejos 010c8018ea
DKEK is reencrypted with the new pin if changed. 
Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
2022-03-04 23:08:15 +01:00

1365 lines
52 KiB
C
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#include "sc_hsm.h"
#include "file.h"
#include "libopensc/card-sc-hsm.h"
#include "random.h"
#include "common.h"
#include "mbedtls/sha256.h"
#include "mbedtls/aes.h"
#include "mbedtls/rsa.h"
#include "mbedtls/ecp.h"
#include "mbedtls/ecdsa.h"
const uint8_t sc_hsm_aid[] = {
11,
0xE8,0x2B,0x06,0x01,0x04,0x01,0x81,0xC3,0x1F,0x02,0x01
};
uint8_t session_pin[32], session_sopin[32];
bool has_session_pin = false, has_session_sopin = false;
static uint8_t dkeks = 0, current_dkeks = 0;
static uint8_t tmp_dkek[IV_SIZE+32];
static int sc_hsm_process_apdu();
static void init_sc_hsm();
app_t *sc_hsm_select_aid(app_t *a) {
if (!memcmp(apdu.cmd_apdu_data, sc_hsm_aid+1, MIN(apdu.cmd_apdu_data_len,sc_hsm_aid[0]))) {
a->aid = sc_hsm_aid;
a->process_apdu = sc_hsm_process_apdu;
init_sc_hsm();
return a;
}
return NULL;
}
void __attribute__ ((constructor)) sc_hsm_ctor() {
register_app(sc_hsm_select_aid);
}
void init_sc_hsm() {
scan_flash();
has_session_pin = has_session_sopin = false;
}
static int encrypt(const uint8_t *key, const uint8_t *iv, uint8_t *data, int len)
{
mbedtls_aes_context aes;
uint8_t tmp_iv[IV_SIZE];
size_t iv_offset = 0;
memcpy(tmp_iv, iv, IV_SIZE);
int r = mbedtls_aes_setkey_enc (&aes, key, 256);
if (r != 0)
return HSM_EXEC_ERROR;
return mbedtls_aes_crypt_cfb128(&aes, MBEDTLS_AES_ENCRYPT, len, &iv_offset, tmp_iv, data, data);
}
static int decrypt(const uint8_t *key, const uint8_t *iv, uint8_t *data, int len)
{
mbedtls_aes_context aes;
uint8_t tmp_iv[IV_SIZE];
size_t iv_offset = 0;
memcpy(tmp_iv, iv, IV_SIZE);
int r = mbedtls_aes_setkey_enc (&aes, key, 256);
if (r != 0)
return HSM_EXEC_ERROR;
return mbedtls_aes_crypt_cfb128(&aes, MBEDTLS_AES_DECRYPT, len, &iv_offset, tmp_iv, data, data);
}
int load_dkek() {
if (has_session_pin == false)
return HSM_NO_LOGIN;
file_t *tf = search_by_fid(EF_DKEK, NULL, SPECIFY_EF);
if (!tf)
return HSM_ERR_FILE_NOT_FOUND;
memcpy(tmp_dkek, file_read(tf->data+sizeof(uint16_t)), IV_SIZE+32);
int ret = decrypt(session_pin, tmp_dkek, tmp_dkek+IV_SIZE, 32);
if (ret != 0)
return HSM_EXEC_ERROR;
return HSM_OK;
}
void release_dkek() {
memset(tmp_dkek, 0, sizeof(tmp_dkek));
}
void select_file(file_t *pe) {
if (!pe)
{
currentDF = (file_t *)MF;
currentEF = NULL;
}
else if (pe->type & FILE_TYPE_INTERNAL_EF) {
currentEF = pe;
currentDF = &file_entries[pe->parent];
}
else {
currentDF = pe;
}
if (currentEF == file_openpgp || currentEF == file_sc_hsm) {
selected_applet = currentEF;
isUserAuthenticated = false;
}
}
static int cmd_select() {
uint8_t p1 = P1(apdu);
uint8_t p2 = P2(apdu);
file_t *pe = NULL;
uint16_t fid = 0x0;
// Only "first or only occurence" supported
//if ((p2 & 0xF3) != 0x00) {
// return SW_INCORRECT_P1P2();
//}
if (apdu.cmd_apdu_data_len >= 2)
fid = get_uint16_t(apdu.cmd_apdu_data, 0);
if ((fid & 0xff00) == (PRKD_PREFIX << 8)) {
if (!(pe = search_dynamic_file(fid)))
return SW_FILE_NOT_FOUND();
}
else if ((fid & 0xff00) == (CD_PREFIX << 8)) {
if (!(pe = search_dynamic_file(fid)))
return SW_FILE_NOT_FOUND();
}
else if ((fid & 0xff00) == (EE_CERTIFICATE_PREFIX << 8)) {
if (!(pe = search_dynamic_file(fid)))
return SW_FILE_NOT_FOUND();
}
if (!pe) {
if (p1 == 0x0) { //Select MF, DF or EF - File identifier or absent
if (apdu.cmd_apdu_data_len == 0) {
pe = (file_t *)MF;
//ac_fini();
}
else if (apdu.cmd_apdu_data_len == 2) {
if (!(pe = search_by_fid(fid, NULL, SPECIFY_ANY))) {
return SW_FILE_NOT_FOUND();
}
}
}
else if (p1 == 0x01) { //Select child DF - DF identifier
if (!(pe = search_by_fid(fid, currentDF, SPECIFY_DF))) {
return SW_FILE_NOT_FOUND();
}
}
else if (p1 == 0x02) { //Select EF under the current DF - EF identifier
if (!(pe = search_by_fid(fid, currentDF, SPECIFY_EF))) {
return SW_FILE_NOT_FOUND();
}
}
else if (p1 == 0x03) { //Select parent DF of the current DF - Absent
if (apdu.cmd_apdu_data_len != 0)
return SW_FILE_NOT_FOUND();
}
else if (p1 == 0x04) { //Select by DF name - e.g., [truncated] application identifier
if (!(pe = search_by_name(apdu.cmd_apdu_data, apdu.cmd_apdu_data_len))) {
return SW_FILE_NOT_FOUND();
}
if (card_terminated) {
return set_res_sw (0x62, 0x85);
}
}
else if (p1 == 0x08) { //Select from the MF - Path without the MF identifier
if (!(pe = search_by_path(apdu.cmd_apdu_data, apdu.cmd_apdu_data_len, MF))) {
return SW_FILE_NOT_FOUND();
}
}
else if (p1 == 0x09) { //Select from the current DF - Path without the current DF identifier
if (!(pe = search_by_path(apdu.cmd_apdu_data, apdu.cmd_apdu_data_len, currentDF))) {
return SW_FILE_NOT_FOUND();
}
}
}
if ((p2 & 0xfc) == 0x00 || (p2 & 0xfc) == 0x04) {
process_fci(pe);
}
else
return SW_INCORRECT_P1P2();
select_file(pe);
return SW_OK ();
}
int parse_token_info(const file_t *f, int mode) {
char *label = "HSM2040";
char *manu = "Pol Henarejos";
sc_pkcs15_tokeninfo_t *ti = (sc_pkcs15_tokeninfo_t *)calloc(1, sizeof(sc_pkcs15_tokeninfo_t));
ti->version = 3;
ti->flags = SC_PKCS15_TOKEN_PRN_GENERATION | SC_PKCS15_TOKEN_EID_COMPLIANT;
ti->label = (char *)calloc(strlen(label)+1, sizeof(char));
strlcpy(ti->label, label, strlen(label)+1);
ti->serial_number = (char *)calloc(2 * PICO_UNIQUE_BOARD_ID_SIZE_BYTES + 1, sizeof(char));
pico_get_unique_board_id_string(ti->serial_number, 2 * PICO_UNIQUE_BOARD_ID_SIZE_BYTES + 1);
ti->manufacturer_id = (char *)calloc(strlen(manu)+1, sizeof(char));
strlcpy(ti->manufacturer_id, manu, strlen(manu)+1);
uint8_t *b;
size_t len;
int r = sc_pkcs15_encode_tokeninfo(NULL, ti, &b, &len);
if (mode == 1) {
memcpy(res_APDU, b, len);
res_APDU_size = len;
}
free(b);
sc_pkcs15_free_tokeninfo(ti);
return len;
}
static int cmd_list_keys()
{
//first CC
for (int i = 0; i < dynamic_files; i++) {
file_t *f = &dynamic_file[i];
if ((f->fid & 0xff00) == (PRKD_PREFIX << 8)) {
res_APDU[res_APDU_size++] = KEY_PREFIX;
res_APDU[res_APDU_size++] = f->fid & 0xff;
}
}
//second CD
for (int i = 0; i < dynamic_files; i++) {
file_t *f = &dynamic_file[i];
if ((f->fid & 0xff00) == (CD_PREFIX << 8)) {
res_APDU[res_APDU_size++] = CD_PREFIX;
res_APDU[res_APDU_size++] = f->fid & 0xff;
}
}
return SW_OK();
}
static int cmd_read_binary()
{
uint16_t fid;
uint32_t offset;
uint8_t ins = INS(apdu), p1 = P1(apdu), p2 = P2(apdu);
const file_t *ef = NULL;
DEBUG_INFO (" - Read binary\r\n");
if ((ins & 0x1) == 0)
{
if ((p1 & 0x80) != 0) {
if (!(ef = search_by_fid(p1&0x1f, NULL, SPECIFY_EF)))
return SW_FILE_NOT_FOUND ();
offset = p2;
}
else {
offset = make_uint16_t(p1, p2) & 0x7fff;
ef = currentEF;
}
}
else {
if (p1 == 0 && (p2 & 0xE0) == 0 && (p2 & 0x1f) != 0 && (p2 & 0x1f) != 0x1f) {
if (!(ef = search_by_fid(p2&0x1f, NULL, SPECIFY_EF)))
return SW_FILE_NOT_FOUND ();
}
else {
uint16_t file_id = make_uint16_t(p1, p2); // & 0x7fff;
if (file_id == 0x0)
ef = currentEF;
else if (!(ef = search_by_fid(file_id, NULL, SPECIFY_EF)) && !(ef = search_dynamic_file(file_id)))
return SW_FILE_NOT_FOUND ();
if (apdu.cmd_apdu_data[0] != 0x54)
return SW_WRONG_DATA();
offset = 0;
for (int d = 0; d < apdu.cmd_apdu_data[1]; d++)
offset |= apdu.cmd_apdu_data[2+d]<<(apdu.cmd_apdu_data[1]-1-d)*8;
}
}
if (!authenticate_action(ef, ACL_OP_READ_SEARCH)) {
return SW_SECURITY_STATUS_NOT_SATISFIED();
}
if (ef->data) {
if ((ef->type & FILE_DATA_FUNC) == FILE_DATA_FUNC) {
uint16_t data_len = ((int (*)(const file_t *, int))(ef->data))((const file_t *)ef, 1); //already copies content to res_APDU
if (offset > data_len)
return SW_WRONG_P1P2();
uint16_t maxle = data_len-offset;
if (apdu.expected_res_size > maxle)
apdu.expected_res_size = maxle;
if (offset) {
res_APDU += offset;
res_APDU_size -= offset;
}
}
else {
uint16_t data_len = file_read_uint16(ef->data);
if (offset > data_len)
return SW_WRONG_P1P2();
uint16_t maxle = data_len-offset;
if (apdu.expected_res_size > maxle)
apdu.expected_res_size = maxle;
res_APDU = file_read(ef->data+2+offset);
res_APDU_size = data_len-offset;
}
}
return SW_OK();
}
int pin_reset_retries(const file_t *pin, bool force) {
if (!pin)
return HSM_ERR_NULL_PARAM;
const file_t *max = search_by_fid(pin->fid+1, NULL, SPECIFY_EF);
const file_t *act = search_by_fid(pin->fid+2, NULL, SPECIFY_EF);
if (!max || !act)
return HSM_ERR_FILE_NOT_FOUND;
uint8_t retries = file_read_uint8(act->data+2);
if (retries == 0 && force == false) //blocked
return HSM_ERR_BLOCKED;
retries = file_read_uint8(max->data+2);
int r = flash_write_data_to_file((file_t *)act, &retries, sizeof(retries));
low_flash_available();
return r;
}
int pin_wrong_retry(const file_t *pin) {
if (!pin)
return HSM_ERR_NULL_PARAM;
const file_t *act = search_by_fid(pin->fid+2, NULL, SPECIFY_EF);
if (!act)
return HSM_ERR_FILE_NOT_FOUND;
uint8_t retries = file_read_uint8(act->data+2);
if (retries > 0) {
retries -= 1;
int r = flash_write_data_to_file((file_t *)act, &retries, sizeof(retries));
low_flash_available();
return r;
}
return HSM_ERR_BLOCKED;
}
int check_pin(const file_t *pin, const uint8_t *data, size_t len) {
if (!pin)
return SW_FILE_NOT_FOUND();
if (!pin->data) {
return SW_REFERENCE_NOT_FOUND();
}
isUserAuthenticated = false;
uint8_t dhash[32];
double_hash_pin(data, len, dhash);
if (sizeof(dhash) != file_read_uint16(pin->data)-1) //1 byte for pin len
return SW_CONDITIONS_NOT_SATISFIED();
if (memcmp(file_read(pin->data+3), dhash, sizeof(dhash)) != 0) {
if (pin_wrong_retry(pin) != HSM_OK)
return SW_PIN_BLOCKED();
return SW_SECURITY_STATUS_NOT_SATISFIED();
}
int r = pin_reset_retries(pin, false);
if (r == HSM_ERR_BLOCKED)
return SW_PIN_BLOCKED();
if (r != HSM_OK)
return SW_MEMORY_FAILURE();
isUserAuthenticated = true;
hash_multi(data, len, session_pin);
has_session_pin = true;
return SW_OK();
}
static int cmd_verify() {
uint8_t p1 = P1(apdu);
uint8_t p2 = P2(apdu);
if (p1 != 0x0 || (p2 & 0x60) != 0x0)
return SW_WRONG_P1P2();
uint8_t qualifier = p2&0x1f;
if (p2 == 0x81) { //UserPin
if (apdu.cmd_apdu_data_len > 0) {
return check_pin(file_pin1, apdu.cmd_apdu_data, apdu.cmd_apdu_data_len);
}
if (file_read_uint8(file_retries_pin1->data+2) == 0)
return SW_PIN_BLOCKED();
return set_res_sw (0x63, 0xc0 | file_read_uint8(file_retries_pin1->data+2));
}
else if (p2 == 0x88) { //SOPin
}
return SW_REFERENCE_NOT_FOUND();
}
static int cmd_reset_retry() {
if (P1(apdu) == 0x0) {
if (P2(apdu) == 0x81) {
if (!file_sopin || !file_pin1) {
return SW_FILE_NOT_FOUND();
}
if (!file_sopin->data) {
return SW_REFERENCE_NOT_FOUND();
}
uint16_t r = check_pin(file_sopin, apdu.cmd_apdu_data, 8);
if (r != 0x9000)
return r;
uint8_t dhash[33];
dhash[0] = apdu.cmd_apdu_data_len-8;
double_hash_pin(apdu.cmd_apdu_data+8, apdu.cmd_apdu_data_len-8, dhash+1);
flash_write_data_to_file(file_pin1, dhash, sizeof(dhash));
if (pin_reset_retries(file_pin1, true) != HSM_OK)
return SW_MEMORY_FAILURE();
low_flash_available();
return SW_OK();
}
}
}
static int cmd_challenge() {
memcpy(res_APDU, random_bytes_get(apdu.expected_res_size), apdu.expected_res_size);
res_APDU_size = apdu.expected_res_size;
return SW_OK();
}
static int cmd_initialize() {
printf("cmd initialize\r\n");
initialize_flash(true);
scan_flash();
dkeks = 0;
const uint8_t *p = apdu.cmd_apdu_data;
while (p-apdu.cmd_apdu_data < apdu.cmd_apdu_data_len) {
uint8_t tag = *p++;
uint8_t tag_len = *p++;
if (tag == 0x80) { //options
}
else if (tag == 0x81) { //user pin
if (file_pin1 && file_pin1->data) {
uint8_t dhash[33];
dhash[0] = tag_len;
double_hash_pin(p, tag_len, dhash+1);
flash_write_data_to_file(file_pin1, dhash, sizeof(dhash));
hash_multi(p, tag_len, session_pin);
has_session_pin = true;
}
}
else if (tag == 0x82) { //user pin
if (file_sopin && file_sopin->data) {
uint8_t dhash[33];
dhash[0] = tag_len;
double_hash_pin(p, tag_len, dhash+1);
flash_write_data_to_file(file_sopin, dhash, sizeof(dhash));
hash_multi(p, tag_len, session_sopin);
has_session_sopin = true;
}
}
else if (tag == 0x91) { //user pin
file_t *tf = search_by_fid(0x1082, NULL, SPECIFY_EF);
if (tf && tf->data) {
flash_write_data_to_file(tf, p, tag_len);
}
if (file_retries_pin1 && file_retries_pin1->data) {
flash_write_data_to_file(file_retries_pin1, p, tag_len);
}
}
else if (tag == 0x92) {
dkeks = *p;
current_dkeks = 0;
}
p += tag_len;
}
p = random_bytes_get(32);
memset(tmp_dkek, 0, sizeof(tmp_dkek));
memcpy(tmp_dkek, p, IV_SIZE);
if (dkeks == 0) {
p = random_bytes_get(32);
memcpy(tmp_dkek, p, 32);
encrypt(session_pin, tmp_dkek, tmp_dkek+IV_SIZE, 32);
file_t *tf = search_by_fid(EF_DKEK, NULL, SPECIFY_EF);
flash_write_data_to_file(tf, tmp_dkek, sizeof(tmp_dkek));
}
return SW_OK();
}
void double_hash_pin(const uint8_t *pin, size_t len, uint8_t output[32]) {
uint8_t o1[32];
hash_multi(pin, len, o1);
for (int i = 0; i < sizeof(o1); i++)
o1[i] ^= pin[i%len];
hash_multi(o1, sizeof(o1), output);
}
void hash_multi(const uint8_t *input, size_t len, uint8_t output[32])
{
mbedtls_sha256_context ctx;
mbedtls_sha256_init(&ctx);
int iters = 256;
pico_get_unique_board_id(&unique_id);
mbedtls_sha256_starts (&ctx, 0);
mbedtls_sha256_update (&ctx, unique_id.id, sizeof(unique_id.id));
while (iters > len)
{
mbedtls_sha256_update (&ctx, input, len);
iters -= len;
}
if (iters > 0) // remaining iterations
mbedtls_sha256_update (&ctx, input, iters);
mbedtls_sha256_finish (&ctx, output);
mbedtls_sha256_free (&ctx);
}
void hash(const uint8_t *input, size_t len, uint8_t output[32])
{
mbedtls_sha256_context ctx;
mbedtls_sha256_init(&ctx);
mbedtls_sha256_starts (&ctx, 0);
mbedtls_sha256_update (&ctx, input, len);
mbedtls_sha256_finish (&ctx, output);
mbedtls_sha256_free (&ctx);
}
static int cmd_import_dkek() {
if (dkeks == 0)
return SW_COMMAND_NOT_ALLOWED();
if (has_session_pin == false)
return SW_CONDITIONS_NOT_SATISFIED();
file_t *tf = search_by_fid(EF_DKEK, NULL, SPECIFY_EF);
if (!authenticate_action(get_parent(tf), ACL_OP_CREATE_EF)) {
return SW_SECURITY_STATUS_NOT_SATISFIED();
}
if (apdu.cmd_apdu_data_len > 0) {
for (int i = 0; i < apdu.cmd_apdu_data_len; i++)
tmp_dkek[IV_SIZE+i] ^= apdu.cmd_apdu_data[i];
if (++current_dkeks == dkeks) {
encrypt(session_pin, tmp_dkek, tmp_dkek+IV_SIZE, 32);
flash_write_data_to_file(tf, tmp_dkek, sizeof(tmp_dkek));
memset(tmp_dkek, 0, sizeof(tmp_dkek));
}
}
res_APDU[0] = dkeks;
res_APDU[1] = dkeks-current_dkeks;
//FNV hash
uint64_t hash = 0xcbf29ce484222325;
memcpy(tmp_dkek, file_read(tf->data+sizeof(uint16_t)), IV_SIZE+32);
decrypt(session_pin, tmp_dkek, tmp_dkek+IV_SIZE, 32);
for (int i = 0; i < 32; i++) {
hash ^= tmp_dkek[IV_SIZE+i];
hash *= 0x00000100000001B3;
}
memset(tmp_dkek, 0, sizeof(tmp_dkek));
memcpy(res_APDU+2,&hash,sizeof(hash));
res_APDU_size = 2+sizeof(hash);
return SW_OK();
}
struct ec_curve_mbed_id {
struct sc_lv_data curve;
mbedtls_ecp_group_id id;
};
struct ec_curve_mbed_id ec_curves_mbed[] = {
{ { (unsigned char *) "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFE\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 24}, MBEDTLS_ECP_DP_SECP192R1 },
{ { (unsigned char *) "\xFF\xFF\xFF\xFF\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 32}, MBEDTLS_ECP_DP_SECP256R1 },
{ { (unsigned char *) "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFE\xFF\xFF\xFF\xFF\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF\xFF\xFF", 48}, MBEDTLS_ECP_DP_SECP384R1 },
{ { (unsigned char *) "\x01\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 66}, MBEDTLS_ECP_DP_SECP521R1 },
{ { (unsigned char *) "\xA9\xFB\x57\xDB\xA1\xEE\xA9\xBC\x3E\x66\x0A\x90\x9D\x83\x8D\x72\x6E\x3B\xF6\x23\xD5\x26\x20\x28\x20\x13\x48\x1D\x1F\x6E\x53\x77", 32}, MBEDTLS_ECP_DP_BP256R1 },
{ { (unsigned char *) "\x8C\xB9\x1E\x82\xA3\x38\x6D\x28\x0F\x5D\x6F\x7E\x50\xE6\x41\xDF\x15\x2F\x71\x09\xED\x54\x56\xB4\x12\xB1\xDA\x19\x7F\xB7\x11\x23\xAC\xD3\xA7\x29\x90\x1D\x1A\x71\x87\x47\x00\x13\x31\x07\xEC\x53", 48}, MBEDTLS_ECP_DP_BP384R1 },
{ { (unsigned char *) "\xAA\xDD\x9D\xB8\xDB\xE9\xC4\x8B\x3F\xD4\xE6\xAE\x33\xC9\xFC\x07\xCB\x30\x8D\xB3\xB3\xC9\xD2\x0E\xD6\x63\x9C\xCA\x70\x33\x08\x71\x7D\x4D\x9B\x00\x9B\xC6\x68\x42\xAE\xCD\xA1\x2A\xE6\xA3\x80\xE6\x28\x81\xFF\x2F\x2D\x82\xC6\x85\x28\xAA\x60\x56\x58\x3A\x48\xF3", 64}, MBEDTLS_ECP_DP_BP512R1 },
{ { (unsigned char *) "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFE\xFF\xFF\xEE\x37", 24}, MBEDTLS_ECP_DP_SECP192K1 },
{ { (unsigned char *) "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFE\xFF\xFF\xFC\x2F", 32}, MBEDTLS_ECP_DP_SECP256K1 },
{ { NULL, 0 }, MBEDTLS_ECP_DP_NONE }
};
//Stores the private and public keys in flash
int store_keys(void *key_ctx, int type, uint8_t key_id, sc_context_t *ctx) {
int r, key_size;
uint8_t *asn1bin, *kdata;
size_t asn1len = 0;
if (type == SC_PKCS15_TYPE_PRKEY_RSA) {
mbedtls_rsa_context *rsa = (mbedtls_rsa_context *)key_ctx;
key_size = mbedtls_mpi_size(&rsa->P)+mbedtls_mpi_size(&rsa->Q);
kdata = (uint8_t *)calloc(1, key_size);
mbedtls_mpi_write_binary(&rsa->P, kdata, key_size/2);
mbedtls_mpi_write_binary(&rsa->Q, kdata+key_size/2, key_size/2);
}
else {
mbedtls_ecdsa_context *ecdsa = (mbedtls_ecdsa_context *)key_ctx;
key_size = mbedtls_mpi_size(&ecdsa->d);
kdata = (uint8_t *)calloc(1, key_size+1);
kdata[0] = ecdsa->grp.id & 0xff;
mbedtls_mpi_write_binary(&ecdsa->d, kdata+1, key_size);
key_size++;
}
if ((r = load_dkek()) != HSM_OK)
return r;
if ((r = encrypt(tmp_dkek+IV_SIZE, tmp_dkek, kdata, key_size)) != 0)
return r;
release_dkek();
file_t *fpk = file_new((KEY_PREFIX << 8) | key_id);
r = flash_write_data_to_file(fpk, kdata, key_size);
free(kdata);
if (r != HSM_OK)
return r;
//add_file_to_chain(fpk, &ef_kf);
struct sc_pkcs15_object *p15o = (struct sc_pkcs15_object *)calloc(1,sizeof (struct sc_pkcs15_object));
sc_pkcs15_prkey_info_t *prkd = (sc_pkcs15_prkey_info_t *)calloc(1, sizeof (sc_pkcs15_prkey_info_t));
memset(prkd, 0, sizeof(sc_pkcs15_prkey_info_t));
prkd->id.len = 1;
prkd->id.value[0] = key_id;
prkd->usage = SC_PKCS15_PRKEY_USAGE_DECRYPT | SC_PKCS15_PRKEY_USAGE_SIGN | SC_PKCS15_PRKEY_USAGE_SIGNRECOVER | SC_PKCS15_PRKEY_USAGE_UNWRAP;
prkd->access_flags = SC_PKCS15_PRKEY_ACCESS_SENSITIVE | SC_PKCS15_PRKEY_ACCESS_NEVEREXTRACTABLE | SC_PKCS15_PRKEY_ACCESS_ALWAYSSENSITIVE | SC_PKCS15_PRKEY_ACCESS_LOCAL;
prkd->native = 1;
prkd->key_reference = key_id;
prkd->path.value[0] = PRKD_PREFIX;
prkd->path.value[1] = key_id;
prkd->path.len = 2;
if (type == SC_PKCS15_TYPE_PRKEY_RSA)
prkd->modulus_length = key_size;
else
prkd->field_length = key_size-1; //contains 1 byte for the grp id
p15o->data = prkd;
p15o->type = SC_PKCS15_TYPE_PRKEY | (type & 0xff);
r = sc_pkcs15_encode_prkdf_entry(ctx, p15o, &asn1bin, &asn1len);
free(prkd);
//sc_asn1_print_tags(asn1bin, asn1len);
fpk = file_new((PRKD_PREFIX << 8) | key_id);
r = flash_write_data_to_file(fpk, asn1bin, asn1len);
free(asn1bin);
if (r != HSM_OK)
return r;
//add_file_to_chain(fpk, &ef_prkdf);
sc_pkcs15_pubkey_info_t *pukd = (sc_pkcs15_pubkey_info_t *)calloc(1, sizeof(sc_pkcs15_pubkey_info_t));
memset(pukd, 0, sizeof(sc_pkcs15_pubkey_info_t));
pukd->id.len = 1;
pukd->id.value[0] = key_id;
pukd->usage = SC_PKCS15_PRKEY_USAGE_ENCRYPT | SC_PKCS15_PRKEY_USAGE_WRAP | SC_PKCS15_PRKEY_USAGE_VERIFY;
pukd->access_flags = SC_PKCS15_PRKEY_ACCESS_EXTRACTABLE;
pukd->native = 1;
pukd->key_reference = key_id;
pukd->path.value[0] = CD_PREFIX;
pukd->path.value[1] = key_id;
pukd->path.len = 2;
if (type == SC_PKCS15_TYPE_PRKEY_RSA)
pukd->modulus_length = key_size;
else
pukd->field_length = key_size-1;
p15o->data = pukd;
p15o->type = SC_PKCS15_TYPE_PUBKEY | (type & 0xff);
r = sc_pkcs15_encode_pukdf_entry(ctx, p15o, &asn1bin, &asn1len);
free(pukd);
free(p15o);
//sc_asn1_print_tags(asn1bin, asn1len);
fpk = file_new((CD_PREFIX << 8) | key_id);
r = flash_write_data_to_file(fpk, asn1bin, asn1len);
free(asn1bin);
if (r != HSM_OK)
return r;
//add_file_to_chain(fpk, &ef_cdf);
low_flash_available();
return HSM_OK;
}
sc_context_t *create_context() {
sc_context_t *ctx;
sc_context_param_t ctx_opts;
memset(&ctx_opts, 0, sizeof(sc_context_param_t));
ctx_opts.ver = 0;
ctx_opts.app_name = "hsm2040";
sc_context_create(&ctx, &ctx_opts);
ctx->debug = 0;
sc_ctx_log_to_file(ctx, "stdout");
return ctx;
}
#define C_ASN1_CVC_PUBKEY_SIZE 10
static const struct sc_asn1_entry c_asn1_cvc_pubkey[C_ASN1_CVC_PUBKEY_SIZE] = {
{ "publicKeyOID", SC_ASN1_OBJECT, SC_ASN1_UNI | SC_ASN1_OBJECT, 0, NULL, NULL },
{ "primeOrModulus", SC_ASN1_OCTET_STRING, SC_ASN1_CTX | 1, SC_ASN1_OPTIONAL | SC_ASN1_ALLOC, NULL, NULL },
{ "coefficientAorExponent", SC_ASN1_OCTET_STRING, SC_ASN1_CTX | 2, SC_ASN1_OPTIONAL | SC_ASN1_ALLOC, NULL, NULL },
{ "coefficientB", SC_ASN1_OCTET_STRING, SC_ASN1_CTX | 3, SC_ASN1_OPTIONAL | SC_ASN1_ALLOC, NULL, NULL },
{ "basePointG", SC_ASN1_OCTET_STRING, SC_ASN1_CTX | 4, SC_ASN1_OPTIONAL | SC_ASN1_ALLOC, NULL, NULL },
{ "order", SC_ASN1_OCTET_STRING, SC_ASN1_CTX | 5, SC_ASN1_OPTIONAL | SC_ASN1_ALLOC, NULL, NULL },
{ "publicPoint", SC_ASN1_OCTET_STRING, SC_ASN1_CTX | 6, SC_ASN1_OPTIONAL | SC_ASN1_ALLOC, NULL, NULL },
{ "cofactor", SC_ASN1_OCTET_STRING, SC_ASN1_CTX | 7, SC_ASN1_OPTIONAL | SC_ASN1_ALLOC, NULL, NULL },
{ "modulusSize", SC_ASN1_INTEGER, SC_ASN1_UNI | SC_ASN1_INTEGER, SC_ASN1_OPTIONAL, NULL, NULL },
{ NULL, 0, 0, 0, NULL, NULL }
};
#define C_ASN1_CVC_BODY_SIZE 5
static const struct sc_asn1_entry c_asn1_cvc_body[C_ASN1_CVC_BODY_SIZE] = {
{ "certificateProfileIdentifier", SC_ASN1_INTEGER, SC_ASN1_APP | 0x1F29, 0, NULL, NULL },
{ "certificationAuthorityReference", SC_ASN1_PRINTABLESTRING, SC_ASN1_APP | 2, 0, NULL, NULL },
{ "publicKey", SC_ASN1_STRUCT, SC_ASN1_CONS | SC_ASN1_APP | 0x1F49, 0, NULL, NULL },
{ "certificateHolderReference", SC_ASN1_PRINTABLESTRING, SC_ASN1_APP | 0x1F20, 0, NULL, NULL },
{ NULL, 0, 0, 0, NULL, NULL }
};
#define C_ASN1_CVCERT_SIZE 3
static const struct sc_asn1_entry c_asn1_cvcert[C_ASN1_CVCERT_SIZE] = {
{ "certificateBody", SC_ASN1_STRUCT, SC_ASN1_CONS | SC_ASN1_APP | 0x1F4E, 0, NULL, NULL },
{ "signature", SC_ASN1_OCTET_STRING, SC_ASN1_APP | 0x1F37, SC_ASN1_ALLOC, NULL, NULL },
{ NULL, 0, 0, 0, NULL, NULL }
};
#define C_ASN1_CVC_SIZE 2
static const struct sc_asn1_entry c_asn1_cvc[C_ASN1_CVC_SIZE] = {
{ "certificate", SC_ASN1_STRUCT, SC_ASN1_CONS | SC_ASN1_APP | 0x1F21, 0, NULL, NULL },
{ NULL, 0, 0, 0, NULL, NULL }
};
#define C_ASN1_AUTHREQ_SIZE 4
static const struct sc_asn1_entry c_asn1_authreq[C_ASN1_AUTHREQ_SIZE] = {
{ "certificate", SC_ASN1_STRUCT, SC_ASN1_CONS | SC_ASN1_APP | 0x1F21, 0, NULL, NULL },
{ "outerCAR", SC_ASN1_PRINTABLESTRING, SC_ASN1_APP | 2, 0, NULL, NULL },
{ "signature", SC_ASN1_OCTET_STRING, SC_ASN1_APP | 0x1F37, SC_ASN1_ALLOC, NULL, NULL },
{ NULL, 0, 0, 0, NULL, NULL }
};
#define C_ASN1_REQ_SIZE 2
static const struct sc_asn1_entry c_asn1_req[C_ASN1_REQ_SIZE] = {
{ "authenticatedrequest", SC_ASN1_STRUCT, SC_ASN1_CONS | SC_ASN1_APP | 7, 0, NULL, NULL },
{ NULL, 0, 0, 0, NULL, NULL }
};
int sc_pkcs15emu_sc_hsm_encode_cvc_req(sc_pkcs15_card_t * p15card, sc_cvc_t *cvc, u8 ** buf, size_t *buflen, bool only_body)
{
sc_card_t *card = p15card->card;
struct sc_asn1_entry asn1_req[C_ASN1_REQ_SIZE];
struct sc_asn1_entry asn1_authreq[C_ASN1_AUTHREQ_SIZE];
struct sc_asn1_entry asn1_cvc[C_ASN1_CVC_SIZE];
struct sc_asn1_entry asn1_cvcert[C_ASN1_CVCERT_SIZE];
struct sc_asn1_entry asn1_cvc_body[C_ASN1_CVC_BODY_SIZE];
struct sc_asn1_entry asn1_cvc_pubkey[C_ASN1_CVC_PUBKEY_SIZE];
size_t lenchr;
size_t lencar;
size_t lenoutCar;
int r;
sc_copy_asn1_entry(c_asn1_req, asn1_req);
sc_copy_asn1_entry(c_asn1_authreq, asn1_authreq);
sc_copy_asn1_entry(c_asn1_cvc, asn1_cvc);
sc_copy_asn1_entry(c_asn1_cvcert, asn1_cvcert);
sc_copy_asn1_entry(c_asn1_cvc_body, asn1_cvc_body);
sc_copy_asn1_entry(c_asn1_cvc_pubkey, asn1_cvc_pubkey);
asn1_cvc_pubkey[1].flags = SC_ASN1_OPTIONAL;
asn1_cvcert[1].flags = SC_ASN1_OPTIONAL;
sc_format_asn1_entry(asn1_cvc_pubkey , &cvc->pukoid, NULL, 1);
if (cvc->primeOrModulus && (cvc->primeOrModuluslen > 0)) {
sc_format_asn1_entry(asn1_cvc_pubkey + 1, cvc->primeOrModulus, &cvc->primeOrModuluslen, 1);
}
sc_format_asn1_entry(asn1_cvc_pubkey + 2, cvc->coefficientAorExponent, &cvc->coefficientAorExponentlen, 1);
if (cvc->coefficientB && (cvc->coefficientBlen > 0)) {
sc_format_asn1_entry(asn1_cvc_pubkey + 3, cvc->coefficientB, &cvc->coefficientBlen, 1);
sc_format_asn1_entry(asn1_cvc_pubkey + 4, cvc->basePointG, &cvc->basePointGlen, 1);
sc_format_asn1_entry(asn1_cvc_pubkey + 5, cvc->order, &cvc->orderlen, 1);
if (cvc->publicPoint && (cvc->publicPointlen > 0)) {
sc_format_asn1_entry(asn1_cvc_pubkey + 6, cvc->publicPoint, &cvc->publicPointlen, 1);
}
sc_format_asn1_entry(asn1_cvc_pubkey + 7, cvc->cofactor, &cvc->cofactorlen, 1);
}
if (cvc->modulusSize > 0) {
sc_format_asn1_entry(asn1_cvc_pubkey + 8, &cvc->modulusSize, NULL, 1);
}
sc_format_asn1_entry(asn1_cvc_body , &cvc->cpi, NULL, 1);
lencar = strnlen(cvc->car, sizeof cvc->car);
sc_format_asn1_entry(asn1_cvc_body + 1, &cvc->car, &lencar, 1);
sc_format_asn1_entry(asn1_cvc_body + 2, &asn1_cvc_pubkey, NULL, 1);
lenchr = strnlen(cvc->chr, sizeof cvc->chr);
sc_format_asn1_entry(asn1_cvc_body + 3, &cvc->chr, &lenchr, 1);
sc_format_asn1_entry(asn1_cvcert , &asn1_cvc_body, NULL, 1);
if (only_body == true) {
r = sc_asn1_encode(card->ctx, asn1_cvcert, buf, buflen);
}
else {
if (cvc->signature && (cvc->signatureLen > 0)) {
sc_format_asn1_entry(asn1_cvcert + 1, cvc->signature, &cvc->signatureLen, 1);
}
sc_format_asn1_entry(asn1_authreq , &asn1_cvcert, NULL, 1);
lenoutCar = strnlen(cvc->outer_car, sizeof cvc->outer_car);
sc_format_asn1_entry(asn1_authreq + 1, &cvc->outer_car, &lenoutCar, 1);
if (cvc->outerSignature && (cvc->outerSignatureLen > 0)) {
sc_format_asn1_entry(asn1_authreq + 2, cvc->outerSignature, &cvc->outerSignatureLen, 1);
}
sc_format_asn1_entry(asn1_req , &asn1_authreq, NULL, 1);
r = sc_asn1_encode(card->ctx, asn1_req, buf, buflen);
}
LOG_TEST_RET(card->ctx, r, "Could not encode card verifiable certificate");
LOG_FUNC_RETURN(card->ctx, SC_SUCCESS);
}
void cvc_init_common(sc_cvc_t *cvc) {
memset(cvc, 0, sizeof(sc_cvc_t));
strlcpy(cvc->car, "UTCA00001", sizeof cvc->car);
strlcpy(cvc->chr, "ESHSMCVCA", sizeof cvc->chr);
strlcat(cvc->chr, "00001", sizeof cvc->chr);
strlcpy(cvc->outer_car, "ESHSM00001", sizeof(cvc->outer_car));
}
int cvc_prepare_signatures(sc_pkcs15_card_t *p15card, sc_cvc_t *cvc, size_t sig_len, uint8_t *hsh) {
uint8_t *cvcbin;
size_t cvclen;
cvc->signatureLen = sig_len;
cvc->signature = (uint8_t *)calloc(1, sig_len);
cvc->outerSignatureLen = sig_len;
cvc->outerSignature = (uint8_t *)calloc(1, sig_len);
int r = sc_pkcs15emu_sc_hsm_encode_cvc_req(p15card, cvc, &cvcbin, &cvclen, true);
if (r != SC_SUCCESS) {
if (cvcbin)
free(cvcbin);
return r;
}
hash(cvcbin, cvclen, hsh);
free(cvcbin);
return HSM_OK;
}
static int cmd_keypair_gen() {
uint8_t key_id = P1(apdu);
uint8_t auth_key_id = P2(apdu);
if (!isUserAuthenticated)
return SW_SECURITY_STATUS_NOT_SATISFIED();
sc_context_t *ctx = create_context();
struct sc_pkcs15_card p15card;
p15card.card = (sc_card_t *)calloc(1, sizeof(sc_card_t));
p15card.card->ctx = ctx;
int ret = 0;
size_t tout = 0;
//sc_asn1_print_tags(apdu.cmd_apdu_data, apdu.cmd_apdu_data_len);
const uint8_t *p = sc_asn1_find_tag(ctx, (const uint8_t *)apdu.cmd_apdu_data, apdu.cmd_apdu_data_len, 0x7f49, &tout);
if (p) {
size_t oid_len = 0;
const uint8_t *oid = sc_asn1_find_tag(ctx, p, tout, 0x6, &oid_len);
if (oid) {
if (memcmp(oid, "\x4\x0\x7F\x0\x7\x2\x2\x2\x1\x2",MIN(oid_len,10)) == 0) { //RSA
size_t ex_len, ks_len;
const uint8_t *ex = sc_asn1_find_tag(ctx, p, tout, 0x82, &ex_len);
const uint8_t *ks = sc_asn1_find_tag(ctx, p, tout, 0x2, &ks_len);
int exponent = 65537, key_size = 2048;
uint8_t *cvcbin = NULL;
size_t cvclen;
if (ex) {
sc_asn1_decode_integer(ex, ex_len, &exponent, 0);
}
if (ks) {
sc_asn1_decode_integer(ks, ks_len, &key_size, 0);
}
mbedtls_rsa_context rsa;
mbedtls_rsa_init(&rsa);
uint8_t index = 0;
ret = mbedtls_rsa_gen_key(&rsa, random_gen, &index, key_size, exponent);
if (ret != 0) {
mbedtls_rsa_free(&rsa);
goto error;
}
sc_cvc_t cvc;
cvc_init_common(&cvc);
struct sc_object_id rsa15withSHA256 = { { 0,4,0,127,0,7,2,2,2,1,2,-1 } };
cvc.coefficientAorExponentlen = ex_len;
cvc.coefficientAorExponent = calloc(1, cvc.coefficientAorExponentlen);
memcpy(cvc.coefficientAorExponent, &exponent, cvc.coefficientAorExponentlen);
cvc.pukoid = rsa15withSHA256;
cvc.modulusSize = key_size;
cvc.primeOrModuluslen = key_size/8;
cvc.primeOrModulus = (uint8_t *)calloc(1, cvc.primeOrModuluslen);
ret = mbedtls_mpi_write_binary(&rsa.N, cvc.primeOrModulus, cvc.primeOrModuluslen);
if (ret != 0) {
sc_pkcs15emu_sc_hsm_free_cvc(&cvc);
mbedtls_rsa_free(&rsa);
goto error;
}
uint8_t hsh[32];
ret = cvc_prepare_signatures(&p15card, &cvc, key_size/8, hsh);
if (ret != HSM_OK) {
sc_pkcs15emu_sc_hsm_free_cvc(&cvc);
mbedtls_rsa_free(&rsa);
goto error;
}
ret = mbedtls_rsa_rsassa_pkcs1_v15_sign(&rsa, random_gen, &index, MBEDTLS_MD_SHA256, 32, hsh, cvc.signature);
if (ret != 0) {
sc_pkcs15emu_sc_hsm_free_cvc(&cvc);
mbedtls_rsa_free(&rsa);
goto error;
}
ret = sc_pkcs15emu_sc_hsm_encode_cvc_req(&p15card, &cvc, &cvcbin, &cvclen, false);
if (ret != SC_SUCCESS) {
if (cvcbin)
free(cvcbin);
sc_pkcs15emu_sc_hsm_free_cvc(&cvc);
mbedtls_rsa_free(&rsa);
goto error;
}
memcpy(res_APDU, cvcbin, cvclen);
free(cvcbin);
sc_pkcs15emu_sc_hsm_free_cvc(&cvc);
res_APDU_size = cvclen;
apdu.expected_res_size = cvclen;
//sc_asn1_print_tags(cvcbin, cvclen);
ret = store_keys(&rsa, SC_PKCS15_TYPE_PRKEY_RSA, key_id, ctx);
if (ret != HSM_OK) {
mbedtls_rsa_free(&rsa);
goto error;
}
mbedtls_rsa_free(&rsa);
}
else if (memcmp(oid, "\x4\x0\x7F\x0\x7\x2\x2\x2\x2\x3",MIN(oid_len,10)) == 0) { //ECC
size_t prime_len;
const uint8_t *prime = sc_asn1_find_tag(ctx, p, tout, 0x81, &prime_len);
mbedtls_ecp_group_id ec_id = MBEDTLS_ECP_DP_NONE;
for (struct ec_curve_mbed_id *ec = ec_curves_mbed; ec->id != MBEDTLS_ECP_DP_NONE; ec++) {
if (prime_len == ec->curve.len && memcmp(prime, ec->curve.value, prime_len) == 0) {
ec_id = ec->id;
break;
}
}
if (ec_id == MBEDTLS_ECP_DP_NONE)
return SW_FUNC_NOT_SUPPORTED();
mbedtls_ecdsa_context ecdsa;
mbedtls_ecdsa_init(&ecdsa);
uint8_t index = 0;
ret = mbedtls_ecdsa_genkey(&ecdsa, ec_id, random_gen, &index);
if (ret != 0) {
mbedtls_ecdsa_free(&ecdsa);
goto error;
}
uint8_t *cvcbin;
size_t cvclen;
sc_cvc_t cvc;
cvc_init_common(&cvc);
struct sc_object_id ecdsaWithSHA256 = { { 0,4,0,127,0,7,2,2,2,2,3,-1 } };
cvc.pukoid = ecdsaWithSHA256;
cvc.coefficientAorExponentlen = prime_len;//mbedtls_mpi_size(&ecdsa.grp.A);
cvc.coefficientAorExponent = calloc(1, cvc.coefficientAorExponentlen);
ret = mbedtls_mpi_write_binary(&ecdsa.grp.A, cvc.coefficientAorExponent, cvc.coefficientAorExponentlen);
if (ret != 0) {
sc_pkcs15emu_sc_hsm_free_cvc(&cvc);
mbedtls_ecdsa_free(&ecdsa);
goto error;
}
cvc.primeOrModuluslen = mbedtls_mpi_size(&ecdsa.grp.P);
cvc.primeOrModulus = (uint8_t *)calloc(1, cvc.primeOrModuluslen);
ret = mbedtls_mpi_write_binary(&ecdsa.grp.P, cvc.primeOrModulus, cvc.primeOrModuluslen);
if (ret != 0) {
sc_pkcs15emu_sc_hsm_free_cvc(&cvc);
mbedtls_ecdsa_free(&ecdsa);
goto error;
}
cvc.coefficientBlen = mbedtls_mpi_size(&ecdsa.grp.B);
cvc.coefficientB = (uint8_t *)calloc(1, cvc.coefficientBlen);
ret = mbedtls_mpi_write_binary(&ecdsa.grp.B, cvc.coefficientB, cvc.coefficientBlen);
if (ret != 0) {
sc_pkcs15emu_sc_hsm_free_cvc(&cvc);
mbedtls_ecdsa_free(&ecdsa);
goto error;
}
cvc.basePointGlen = mbedtls_mpi_size(&ecdsa.grp.G.X)+mbedtls_mpi_size(&ecdsa.grp.G.Y)+mbedtls_mpi_size(&ecdsa.grp.G.Z);
cvc.basePointG = (uint8_t *)calloc(1, cvc.basePointGlen);
ret = mbedtls_ecp_point_write_binary(&ecdsa.grp, &ecdsa.grp.G, MBEDTLS_ECP_PF_UNCOMPRESSED, &cvc.basePointGlen, cvc.basePointG, cvc.basePointGlen);
if (ret != 0) {
sc_pkcs15emu_sc_hsm_free_cvc(&cvc);
mbedtls_ecdsa_free(&ecdsa);
goto error;
}
cvc.orderlen = mbedtls_mpi_size(&ecdsa.grp.N);
cvc.order = (uint8_t *)calloc(1, cvc.orderlen);
ret = mbedtls_mpi_write_binary(&ecdsa.grp.N, cvc.order, cvc.orderlen);
if (ret != 0) {
sc_pkcs15emu_sc_hsm_free_cvc(&cvc);
mbedtls_ecdsa_free(&ecdsa);
goto error;
}
cvc.publicPointlen = mbedtls_mpi_size(&ecdsa.Q.X)+mbedtls_mpi_size(&ecdsa.Q.Y)+mbedtls_mpi_size(&ecdsa.Q.Z);
cvc.publicPoint = (uint8_t *)calloc(1, cvc.publicPointlen);
ret = mbedtls_ecp_point_write_binary(&ecdsa.grp, &ecdsa.Q, MBEDTLS_ECP_PF_UNCOMPRESSED, &cvc.publicPointlen, cvc.publicPoint, cvc.publicPointlen);
if (ret != 0) {
sc_pkcs15emu_sc_hsm_free_cvc(&cvc);
mbedtls_ecdsa_free(&ecdsa);
goto error;
}
cvc.cofactorlen = 1;
cvc.cofactor = (uint8_t *)calloc(1, cvc.cofactorlen);
cvc.cofactor[0] = 1;
cvc.modulusSize = ec_id; //we store the ec_id in the modulusSize, used for RSA, as it is an integer
uint8_t hsh[32];
ret = cvc_prepare_signatures(&p15card, &cvc, ecdsa.grp.pbits*2/8+9, hsh);
if (ret != HSM_OK) {
sc_pkcs15emu_sc_hsm_free_cvc(&cvc);
mbedtls_ecdsa_free(&ecdsa);
goto error;
}
ret = mbedtls_ecdsa_write_signature(&ecdsa, MBEDTLS_MD_SHA256, hsh, sizeof(hsh), cvc.signature, cvc.signatureLen, &cvc.signatureLen, random_gen, &index);
if (ret != 0) {
sc_pkcs15emu_sc_hsm_free_cvc(&cvc);
mbedtls_ecdsa_free(&ecdsa);
goto error;
}
ret = sc_pkcs15emu_sc_hsm_encode_cvc_req(&p15card, &cvc, &cvcbin, &cvclen, false);
if (ret != SC_SUCCESS) {
if (cvcbin)
free(cvcbin);
sc_pkcs15emu_sc_hsm_free_cvc(&cvc);
mbedtls_ecdsa_free(&ecdsa);
goto error;
}
memcpy(res_APDU, cvcbin, cvclen);
free(cvcbin);
sc_pkcs15emu_sc_hsm_free_cvc(&cvc);
res_APDU_size = cvclen;
apdu.expected_res_size = cvclen;
//sc_asn1_print_tags(cvcbin, cvclen);
ret = store_keys(&ecdsa, SC_PKCS15_TYPE_PRKEY_EC, key_id, ctx);
if (ret != HSM_OK) {
mbedtls_ecdsa_free(&ecdsa);
goto error;
}
mbedtls_ecdsa_free(&ecdsa);
}
}
}
error:
free(ctx);
free(p15card.card);
if (ret != 0)
return SW_EXEC_ERROR();
return SW_OK();
}
static int cmd_update_ef() {
uint8_t p1 = P1(apdu), p2 = P2(apdu);
uint16_t fid = (p1 << 8) | p2;
uint8_t *p = apdu.cmd_apdu_data, *data;
uint16_t offset = 0;
uint16_t data_len = 0;
file_t *ef = NULL;
if (!isUserAuthenticated)
return SW_SECURITY_STATUS_NOT_SATISFIED();
if (fid == 0x0)
ef = currentEF;
else if (p1 != EE_CERTIFICATE_PREFIX && p1 != PRKD_PREFIX)
return SW_INCORRECT_P1P2();
if (ef && !authenticate_action(ef, ACL_OP_UPDATE_ERASE))
return SW_SECURITY_STATUS_NOT_SATISFIED();
while (p-apdu.cmd_apdu_data < apdu.cmd_apdu_data_len) {
uint8_t tag = *p++;
uint8_t taglen = *p++;
if (tag == 0x54) { //ofset tag
for (int i = 0; i < taglen; i++)
offset |= (*p++ << (8*(taglen-i-1)));
}
else if (tag == 0x53) { //data
if (taglen == 0x82) {
data_len = *p++ << 8;
data_len |= *p++;
}
else if (taglen == 0x81) {
data_len = *p++;
}
else
data_len = taglen;
data = p;
p += data_len;
}
}
if (data_len == 0 && offset == 0) { //new file
ef = file_new(fid);
//if ((fid & 0xff00) == (EE_CERTIFICATE_PREFIX << 8))
// add_file_to_chain(ef, &ef_pukdf);
select_file(ef);
}
else {
if (fid == 0x0 && !ef)
return SW_FILE_NOT_FOUND();
else if (fid != 0x0 && !(ef = search_by_fid(fid, NULL, SPECIFY_EF)) && !(ef = search_dynamic_file(fid)))
return SW_FILE_NOT_FOUND();
if (offset == 0) {
int r = flash_write_data_to_file(ef, data, data_len);
if (r != HSM_OK)
return SW_MEMORY_FAILURE();
}
else {
if (!ef->data)
return SW_DATA_INVALID();
uint8_t *data_merge = (uint8_t *)calloc(1, offset+data_len);
memcpy(data_merge, file_read(ef->data), offset);
memcpy(data_merge+offset, data, data_len);
int r = flash_write_data_to_file(ef, data_merge, data_len);
free(data_merge);
if (r != HSM_OK)
return SW_MEMORY_FAILURE();
}
low_flash_available();
}
return SW_OK();
}
static int cmd_delete_file() {
file_t *ef = NULL;
if (!isUserAuthenticated)
return SW_SECURITY_STATUS_NOT_SATISFIED();
if (apdu.cmd_apdu_data_len == 0) {
ef = currentEF;
if (!(ef = search_dynamic_file(ef->fid)))
return SW_FILE_INVALID();
}
else {
uint16_t fid = (apdu.cmd_apdu_data[0] << 8) | apdu.cmd_apdu_data[1];
if (!(ef = search_dynamic_file(fid)))
return SW_FILE_NOT_FOUND();
}
if (!authenticate_action(ef, ACL_OP_DELETE_SELF))
return SW_SECURITY_STATUS_NOT_SATISFIED();
if (flash_clear_file(ef) != HSM_OK)
return SW_EXEC_ERROR();
if (delete_dynamic_file(ef) != HSM_OK)
return SW_EXEC_ERROR();
low_flash_available();
return SW_OK();
}
static int cmd_change_pin() {
if (P1(apdu) == 0x0) {
if (P2(apdu) == 0x81) {
if (!file_sopin || !file_pin1) {
return SW_FILE_NOT_FOUND();
}
if (!file_pin1->data) {
return SW_REFERENCE_NOT_FOUND();
}
uint8_t pin_len = file_read_uint8(file_pin1->data+2);
uint16_t r = check_pin(file_pin1, apdu.cmd_apdu_data, pin_len);
if (r != 0x9000)
return r;
if (load_dkek() != HSM_OK) //loads the DKEK with old pin
return SW_EXEC_ERROR();
//encrypt DKEK with new pin
hash_multi(apdu.cmd_apdu_data+pin_len, apdu.cmd_apdu_data_len-pin_len, session_pin);
has_session_pin = true;
encrypt(session_pin, tmp_dkek, tmp_dkek+IV_SIZE, 32);
file_t *tf = search_by_fid(EF_DKEK, NULL, SPECIFY_EF);
flash_write_data_to_file(tf, tmp_dkek, sizeof(tmp_dkek));
release_dkek();
uint8_t dhash[33];
dhash[0] = apdu.cmd_apdu_data_len-pin_len;
double_hash_pin(apdu.cmd_apdu_data+pin_len, apdu.cmd_apdu_data_len-pin_len, dhash+1);
flash_write_data_to_file(file_pin1, dhash, sizeof(dhash));
low_flash_available();
return SW_OK();
}
}
}
static int cmd_key_gen() {
uint8_t key_id = P1(apdu);
uint8_t p2 = P2(apdu);
uint8_t key_size = 32;
if (p2 == 0xB2)
key_size = 32;
else if (p2 == 0xB1)
key_size = 24;
else if (p2 == 0xB0)
key_size = 16;
if (!isUserAuthenticated)
return SW_SECURITY_STATUS_NOT_SATISFIED();
//at this moment, we do not use the template, as only CBC is supported by the driver (encrypt, decrypt and CMAC)
const uint8_t *aes_key = random_bytes_get(32);
file_t *fpk = file_new((KEY_PREFIX << 8) | key_id);
int r = flash_write_data_to_file(fpk, aes_key, key_size);
if (r != HSM_OK)
return SW_MEMORY_FAILURE();
fpk = file_new((PRKD_PREFIX << 8) | key_id);
r = flash_write_data_to_file(fpk, NULL, 0);
if (r != HSM_OK)
return SW_MEMORY_FAILURE();
low_flash_available();
return SW_OK();
}
static int cmd_signature() {
uint8_t key_id = P1(apdu);
uint8_t p2 = P2(apdu);
mbedtls_md_type_t md = MBEDTLS_MD_NONE;
file_t *fkey;
if (!(fkey = search_dynamic_file((KEY_PREFIX << 8) | key_id)) || !fkey->data)
return SW_FILE_NOT_FOUND();
int key_size = file_read_uint16(fkey->data);
if (p2 == ALGO_RSA_PKCS1_SHA1 || p2 == ALGO_RSA_PSS_SHA1 || p2 == ALGO_EC_SHA1)
md = MBEDTLS_MD_SHA1;
else if (p2 == ALGO_RSA_PKCS1_SHA256 || p2 == ALGO_RSA_PSS_SHA256 || p2 == ALGO_EC_SHA256)
md = MBEDTLS_MD_SHA256;
else if (p2 == ALGO_EC_SHA224)
md = MBEDTLS_MD_SHA224;
if (p2 == ALGO_RSA_RAW || p2 == ALGO_RSA_PKCS1 || p2 == ALGO_RSA_PKCS1_SHA1 || p2 == ALGO_RSA_PKCS1_SHA256 || p2 == ALGO_RSA_PSS || p2 == ALGO_RSA_PSS_SHA1 || p2 == ALGO_RSA_PSS_SHA256) {
mbedtls_rsa_context ctx;
mbedtls_rsa_init(&ctx);
if (p2 == ALGO_RSA_PSS || p2 == ALGO_RSA_PSS_SHA1 || p2 == ALGO_RSA_PSS_SHA256) {
mbedtls_rsa_set_padding(&ctx, MBEDTLS_RSA_PKCS_V21, md);
}
else if (p2 == ALGO_RSA_PKCS1) { //DigestInfo attached
unsigned int algo;
if (sc_pkcs1_strip_digest_info_prefix(&algo, apdu.cmd_apdu_data, apdu.cmd_apdu_data_len, apdu.cmd_apdu_data, &apdu.cmd_apdu_data_len) != SC_SUCCESS) //gets the MD algo id and strips it off
return SW_EXEC_ERROR();
if (algo == SC_ALGORITHM_RSA_HASH_SHA1)
md = MBEDTLS_MD_SHA1;
else if (algo == SC_ALGORITHM_RSA_HASH_SHA224)
md = MBEDTLS_MD_SHA224;
else if (algo == SC_ALGORITHM_RSA_HASH_SHA256)
md = MBEDTLS_MD_SHA256;
else if (algo == SC_ALGORITHM_RSA_HASH_SHA384)
md = MBEDTLS_MD_SHA384;
else if (algo == SC_ALGORITHM_RSA_HASH_SHA512)
md = MBEDTLS_MD_SHA512;
}
if (mbedtls_mpi_read_binary(&ctx.P, fkey->data+2, key_size/2) != 0) {
mbedtls_rsa_free(&ctx);
return SW_DATA_INVALID();
}
if (mbedtls_mpi_read_binary(&ctx.Q, fkey->data+2+key_size/2, key_size/2) != 0) {
mbedtls_rsa_free(&ctx);
return SW_DATA_INVALID();
}
if (mbedtls_mpi_lset(&ctx.E, 0x10001) != 0) {
mbedtls_rsa_free(&ctx);
return SW_EXEC_ERROR();
}
if (mbedtls_rsa_import(&ctx, NULL, &ctx.P, &ctx.Q, NULL, &ctx.E) != 0) {
mbedtls_rsa_free(&ctx);
return SW_DATA_INVALID();
}
if (mbedtls_rsa_complete(&ctx) != 0) {
mbedtls_rsa_free(&ctx);
return SW_DATA_INVALID();
}
if (mbedtls_rsa_check_privkey(&ctx) != 0) {
mbedtls_rsa_free(&ctx);
return SW_DATA_INVALID();
}
int r;
if (md == MBEDTLS_MD_NONE) {
if (apdu.cmd_apdu_data_len < key_size) //needs padding
memset(apdu.cmd_apdu_data+apdu.cmd_apdu_data_len, 0, key_size-apdu.cmd_apdu_data_len);
r = mbedtls_rsa_private(&ctx, random_gen, NULL, apdu.cmd_apdu_data, res_APDU);
}
else {
r = mbedtls_rsa_pkcs1_sign(&ctx, random_gen, NULL, md, apdu.cmd_apdu_data_len, apdu.cmd_apdu_data, res_APDU);
}
if (r != 0) {
mbedtls_rsa_free(&ctx);
return SW_EXEC_ERROR();
}
res_APDU_size = key_size;
apdu.expected_res_size = key_size;
mbedtls_rsa_free(&ctx);
}
else if (p2 == ALGO_EC_RAW || p2 == ALGO_EC_SHA1 || p2 == ALGO_EC_SHA224 || p2 == ALGO_EC_SHA256) {
mbedtls_ecdsa_context ctx;
mbedtls_ecdsa_init(&ctx);
mbedtls_ecp_group_id gid = file_read_uint8(fkey->data+2);
if (p2 == ALGO_EC_RAW) {
if (apdu.cmd_apdu_data_len == 32)
md = MBEDTLS_MD_SHA256;
else if (apdu.cmd_apdu_data_len == 20)
md = MBEDTLS_MD_SHA1;
else if (apdu.cmd_apdu_data_len == 28)
md = MBEDTLS_MD_SHA224;
else if (apdu.cmd_apdu_data_len == 48)
md = MBEDTLS_MD_SHA384;
else if (apdu.cmd_apdu_data_len == 64)
md = MBEDTLS_MD_SHA512;
}
if (mbedtls_ecp_group_load(&ctx.grp, gid) != 0) {
mbedtls_ecdsa_free(&ctx);
return SW_DATA_INVALID();
}
if (mbedtls_mpi_read_binary(&ctx.d, fkey->data+3, key_size-1) != 0) {
mbedtls_ecdsa_free(&ctx);
return SW_DATA_INVALID();
}
size_t olen = 0;
if (mbedtls_ecdsa_write_signature(&ctx, md, apdu.cmd_apdu_data, apdu.cmd_apdu_data_len, res_APDU, MBEDTLS_ECDSA_MAX_LEN, &olen, random_gen, NULL) != 0) {
mbedtls_ecdsa_free(&ctx);
return SW_EXEC_ERROR();
}
res_APDU_size = olen;
mbedtls_ecdsa_free(&ctx);
}
else
return SW_INCORRECT_P1P2();
return SW_OK();
}
typedef struct cmd
{
uint8_t ins;
int (*cmd_handler)();
} cmd_t;
#define INS_VERIFY 0x20
#define INS_CHANGE_PIN 0x24
#define INS_RESET_RETRY 0x2C
#define INS_KEYPAIR_GEN 0x46
#define INS_KEY_GEN 0x48
#define INS_INITIALIZE 0x50
#define INS_IMPORT_DKEK 0x52
#define INS_LIST_KEYS 0x58
#define INS_SIGNATURE 0x68
#define INS_CHALLENGE 0x84
#define INS_SELECT_FILE 0xA4
#define INS_READ_BINARY 0xB0
#define INS_READ_BINARY_ODD 0xB1
#define INS_UPDATE_EF 0xD7
#define INS_DELETE_FILE 0xE4
static const cmd_t cmds[] = {
{ INS_SELECT_FILE, cmd_select },
{ INS_LIST_KEYS, cmd_list_keys },
{ INS_READ_BINARY, cmd_read_binary },
{ INS_READ_BINARY_ODD, cmd_read_binary },
{ INS_VERIFY, cmd_verify },
{ INS_RESET_RETRY, cmd_reset_retry },
{ INS_CHALLENGE, cmd_challenge },
{ INS_INITIALIZE, cmd_initialize },
{ INS_IMPORT_DKEK, cmd_import_dkek },
{ INS_KEYPAIR_GEN, cmd_keypair_gen },
{ INS_UPDATE_EF, cmd_update_ef },
{ INS_DELETE_FILE, cmd_delete_file },
{ INS_CHANGE_PIN, cmd_change_pin },
{ INS_KEY_GEN, cmd_key_gen },
{ INS_SIGNATURE, cmd_signature },
{ 0x00, 0x0}
};
int sc_hsm_process_apdu() {
for (const cmd_t *cmd = cmds; cmd->ins != 0x00; cmd++) {
if (cmd->ins == INS(apdu))
return cmd->cmd_handler();
}
return SW_INS_NOT_SUPPORTED();
}
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