RfidResearchGroup/proxmark3
1
1
Fork 0
mirror of https://github.com/RfidResearchGroup/proxmark3.git synced 2025-01-09 09:39:16 +08:00
Code Issues Projects Releases Packages Wiki Activity

Merge pull request #81 from merlokk/emv_sdadda_fix

Browse source 
Emv sdadda fix
This commit is contained in:
Oleg Moiseenko 2019-01-10 17:27:29 +02:00 committed by GitHub
commit 7eb3e79d83
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
7 changed files with 220 additions and 41 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

92
client/emv/cmdemv.c
View file

@ -38,6 +38,9 @@ void ParamLoadDefaults(struct tlvdb *tlvRoot) {
TLV_ADD(0x9F6A, "\x01\x02\x03\x04");
//9F66:(Terminal Transaction Qualifiers (TTQ)) len:4
TLV_ADD(0x9F66, "\x26\x00\x00\x00"); // qVSDC
//95:(Terminal Verification Results) len:5
// all OK TVR
TLV_ADD(0x95, "\x00\x00\x00\x00\x00");
}
void PrintChannel(EMVCommandChannel channel) {
@ -685,6 +688,50 @@ void ProcessGPOResponseFormat1(struct tlvdb *tlvRoot, uint8_t *buf, size_t len,
}
}
void ProcessACResponseFormat1(struct tlvdb *tlvRoot, uint8_t *buf, size_t len, bool decodeTLV) {
if (buf[0] == 0x80) {
if (decodeTLV){
PrintAndLog("GPO response format1:");
TLVPrintFromBuffer(buf, len);
}
uint8_t elmlen = len - 2; // wo 0x80XX
if (len < 4 + 2 || (elmlen - 2) % 4 || elmlen != buf[1]) {
PrintAndLogEx(ERR, "GPO response format1 parsing error. length=%d", len);
} else {
struct tlvdb *tlvElm = NULL;
if (decodeTLV)
PrintAndLog("\n------------ Format1 decoded ------------");
// CID (Cryptogram Information Data)
tlvdb_change_or_add_node_ex(tlvRoot, 0x9f27, 1, &buf[2], &tlvElm);
if (decodeTLV)
TLVPrintFromTLV(tlvElm);
// ATC (Application Transaction Counter)
tlvdb_change_or_add_node_ex(tlvRoot, 0x9f36, 2, &buf[3], &tlvElm);
if (decodeTLV)
TLVPrintFromTLV(tlvElm);
// AC (Application Cryptogram)
tlvdb_change_or_add_node_ex(tlvRoot, 0x9f26, min(8, elmlen - 3), &buf[5], &tlvElm);
if (decodeTLV)
TLVPrintFromTLV(tlvElm);
// IAD (Issuer Application Data) - optional
if (len > 11 + 2) {
tlvdb_change_or_add_node_ex(tlvRoot, 0x9f10, elmlen - 11, &buf[13], &tlvElm);
if (decodeTLV)
TLVPrintFromTLV(tlvElm);
}
}
} else {
if (decodeTLV)
TLVPrintFromBuffer(buf, len);
}
}
int CmdEMVExec(const char *cmd) {
uint8_t buf[APDU_RES_LEN] = {0};
size_t len = 0;
@ -731,9 +778,9 @@ int CmdEMVExec(const char *cmd) {
enum TransactionType TrType = TT_MSD;
if (arg_get_lit(7))
TrType = TT_QVSDCMCHIP;
TrType = TT_QVSDCMCHIP;
if (arg_get_lit(8))
TrType = TT_CDA;
TrType = TT_CDA;
if (arg_get_lit(9))
TrType = TT_VSDC;
@ -870,7 +917,7 @@ int CmdEMVExec(const char *cmd) {
uint8_t SFIend = AFL->value[i * 4 + 2];
uint8_t SFIoffline = AFL->value[i * 4 + 3];
PrintAndLogEx(NORMAL, "* * SFI[%02x] start:%02x end:%02x offline:%02x", SFI, SFIstart, SFIend, SFIoffline);
PrintAndLogEx(NORMAL, "* * SFI[%02x] start:%02x end:%02x offline count:%02x", SFI, SFIstart, SFIend, SFIoffline);
if (SFI == 0 || SFI == 31 || SFIstart == 0 || SFIstart > SFIend) {
PrintAndLogEx(NORMAL, "SFI ERROR! Skipped...");
continue;
@ -892,7 +939,7 @@ int CmdEMVExec(const char *cmd) {
// Build Input list for Offline Data Authentication
// EMV 4.3 book3 10.3, page 96
if (SFIoffline) {
if (SFIoffline > 0) {
if (SFI < 11) {
const unsigned char *abuf = buf;
size_t elmlen = len;
@ -907,6 +954,8 @@ int CmdEMVExec(const char *cmd) {
memcpy(&ODAiList[ODAiListLen], buf, len);
ODAiListLen += len;
}
SFIoffline--;
}
}
}
@ -1128,6 +1177,41 @@ int CmdEMVExec(const char *cmd) {
}
}
// VSDC
if (GetCardPSVendor(AID, AIDlen) == CV_VISA && (TrType == TT_VSDC || TrType == TT_CDA)){
PrintAndLogEx(NORMAL, "\n--> VSDC transaction.");
PrintAndLogEx(NORMAL, "* * Calc CDOL1");
struct tlv *cdol_data_tlv = dol_process(tlvdb_get(tlvRoot, 0x8c, NULL), tlvRoot, 0x01); // 0x01 - dummy tag
if (!cdol_data_tlv) {
PrintAndLogEx(WARNING, "Error: can't create CDOL1 TLV.");
dreturn(6);
}
PrintAndLogEx(NORMAL, "CDOL1 data[%d]: %s", cdol_data_tlv->len, sprint_hex(cdol_data_tlv->value, cdol_data_tlv->len));
PrintAndLogEx(NORMAL, "* * AC1");
// EMVAC_TC + EMVAC_CDAREQ --- to get SDAD
res = EMVAC(channel, true, (TrType == TT_CDA) ? EMVAC_TC + EMVAC_CDAREQ : EMVAC_TC, (uint8_t *)cdol_data_tlv->value, cdol_data_tlv->len, buf, sizeof(buf), &len, &sw, tlvRoot);
if (res) {
PrintAndLogEx(NORMAL, "AC1 error(%d): %4x. Exit...", res, sw);
dreturn(7);
}
// process Format1 (0x80) anf print Format2 (0x77)
ProcessACResponseFormat1(tlvRoot, buf, len, decodeTLV);
PrintAndLogEx(NORMAL, "\n* * Processing online request\n");
// authorization response code from acquirer
const char HostResponse[] = "00"; // 0x3030
PrintAndLogEx(NORMAL, "* * Host Response: `%s`", HostResponse);
tlvdb_change_or_add_node(tlvRoot, 0x8a, sizeof(HostResponse) - 1, (const unsigned char *)HostResponse);
}
DropField();
// Destroy TLV's

89
client/emv/emv_pki.c
View file

@ -41,7 +41,8 @@ static unsigned char *emv_pki_decode_message(const struct emv_pk *enc_pk,
uint8_t msgtype,
size_t *len,
const struct tlv *cert_tlv,
... /* A list of tlv pointers, end with NULL */
int tlv_count,
... /* A list of tlv pointers */
)
{
struct crypto_pk *kcp;
@ -99,20 +100,23 @@ static unsigned char *emv_pki_decode_message(const struct emv_pk *enc_pk,
size_t hash_len = crypto_hash_get_size(ch);
crypto_hash_write(ch, data + 1, data_len - 2 - hash_len);
va_start(vl, cert_tlv);
while (true) {
va_start(vl, tlv_count);
for (int i = 0; i < tlv_count; i++) {
const struct tlv *add_tlv = va_arg(vl, const struct tlv *);
if (!add_tlv)
break;
continue;
crypto_hash_write(ch, add_tlv->value, add_tlv->len);
}
va_end(vl);
if (memcmp(data + data_len - 1 - hash_len, crypto_hash_read(ch), hash_len)) {
uint8_t hash[hash_len];
memset(hash, 0, hash_len);
memcpy(hash, crypto_hash_read(ch), hash_len);
if (memcmp(data + data_len - 1 - hash_len, hash, hash_len)) {
printf("ERROR: Calculated wrong hash\n");
printf("decoded: %s\n",sprint_hex(data + data_len - 1 - hash_len, hash_len));
printf("calculated: %s\n",sprint_hex(crypto_hash_read(ch), hash_len));
printf("calculated: %s\n",sprint_hex(hash, hash_len));
if (strictExecution) {
crypto_hash_close(ch);
@ -165,6 +169,7 @@ static struct emv_pk *emv_pki_decode_key_ex(const struct emv_pk *enc_pk,
const struct tlv *exp_tlv,
const struct tlv *rem_tlv,
const struct tlv *add_tlv,
const struct tlv *sdatl_tlv,
bool showData
)
{
@ -190,9 +195,11 @@ static struct emv_pk *emv_pki_decode_key_ex(const struct emv_pk *enc_pk,
data = emv_pki_decode_message(enc_pk, msgtype, &data_len,
cert_tlv,
5,
rem_tlv,
exp_tlv,
add_tlv,
sdatl_tlv,
NULL);
if (!data || data_len < 11 + pan_length) {
printf("ERROR: Can't decode message\n");
@ -275,9 +282,10 @@ static struct emv_pk *emv_pki_decode_key(const struct emv_pk *enc_pk,
const struct tlv *cert_tlv,
const struct tlv *exp_tlv,
const struct tlv *rem_tlv,
const struct tlv *add_tlv
const struct tlv *add_tlv,
const struct tlv *sdatl_tlv
) {
return emv_pki_decode_key_ex(enc_pk, msgtype, pan_tlv, cert_tlv, exp_tlv, rem_tlv, add_tlv, false);
return emv_pki_decode_key_ex(enc_pk, msgtype, pan_tlv, cert_tlv, exp_tlv, rem_tlv, add_tlv, sdatl_tlv, false);
}
struct emv_pk *emv_pki_recover_issuer_cert(const struct emv_pk *pk, struct tlvdb *db)
@ -287,17 +295,30 @@ struct emv_pk *emv_pki_recover_issuer_cert(const struct emv_pk *pk, struct tlvdb
tlvdb_get(db, 0x90, NULL),
tlvdb_get(db, 0x9f32, NULL),
tlvdb_get(db, 0x92, NULL),
NULL,
NULL);
}
struct emv_pk *emv_pki_recover_icc_cert(const struct emv_pk *pk, struct tlvdb *db, const struct tlv *sda_tlv)
{
return emv_pki_decode_key(pk, 4,
size_t sdatl_len;
unsigned char *sdatl = emv_pki_sdatl_fill(db, &sdatl_len);
struct tlv sda_tdata = {
.tag = 0x00, // dummy tag
.len = sdatl_len,
.value = sdatl
};
struct emv_pk *res = emv_pki_decode_key(pk, 4,
tlvdb_get(db, 0x5a, NULL),
tlvdb_get(db, 0x9f46, NULL),
tlvdb_get(db, 0x9f47, NULL),
tlvdb_get(db, 0x9f48, NULL),
sda_tlv);
sda_tlv,
&sda_tdata);
free(sdatl); // malloc here: emv_pki_sdatl_fill
return res;
}
struct emv_pk *emv_pki_recover_icc_pe_cert(const struct emv_pk *pk, struct tlvdb *db)
@ -307,17 +328,62 @@ struct emv_pk *emv_pki_recover_icc_pe_cert(const struct emv_pk *pk, struct tlvdb
tlvdb_get(db, 0x9f2d, NULL),
tlvdb_get(db, 0x9f2e, NULL),
tlvdb_get(db, 0x9f2f, NULL),
NULL,
NULL);
}
unsigned char *emv_pki_sdatl_fill(const struct tlvdb *db, size_t *sdatl_len) {
uint8_t buf[2048] = {0};
size_t len = 0;
*sdatl_len = 0;
const struct tlv *sda_tl = tlvdb_get(db, 0x9f4a, NULL);
if (!sda_tl || sda_tl->len <= 0)
return NULL;
for (int i = 0; i < sda_tl->len; i++) {
uint32_t tag = sda_tl->value[i]; // here may be multibyte, but now not
const struct tlv *elm = tlvdb_get(db, tag, NULL);
if (elm) {
memcpy(&buf[len], elm->value, elm->len);
len += elm->len;
}
}
if (len) {
*sdatl_len = len;
unsigned char *value = malloc(len);
memcpy(value, buf, len);
return value;
}
return NULL;
}
struct tlvdb *emv_pki_recover_dac_ex(const struct emv_pk *enc_pk, const struct tlvdb *db, const struct tlv *sda_tlv, bool showData)
{
size_t data_len;
// Static Data Authentication Tag List
size_t sdatl_len;
unsigned char *sdatl = emv_pki_sdatl_fill(db, &sdatl_len);
struct tlv sda_tdata = {
.tag = 0x00, // dummy tag
.len = sdatl_len,
.value = sdatl
};
unsigned char *data = emv_pki_decode_message(enc_pk, 3, &data_len,
tlvdb_get(db, 0x93, NULL),
3,
sda_tlv,
&sda_tdata,
NULL);
free(sdatl); // malloc here: emv_pki_sdatl_fill
if (!data || data_len < 5)
return NULL;
@ -345,6 +411,7 @@ struct tlvdb *emv_pki_recover_idn_ex(const struct emv_pk *enc_pk, const struct t
size_t data_len;
unsigned char *data = emv_pki_decode_message(enc_pk, 5, &data_len,
tlvdb_get(db, 0x9f4b, NULL),
2,
dyn_tlv,
NULL);
@ -380,6 +447,7 @@ struct tlvdb *emv_pki_recover_atc_ex(const struct emv_pk *enc_pk, const struct t
size_t data_len;
unsigned char *data = emv_pki_decode_message(enc_pk, 5, &data_len,
tlvdb_get(db, 0x9f4b, NULL),
5,
tlvdb_get(db, 0x9f37, NULL),
tlvdb_get(db, 0x9f02, NULL),
tlvdb_get(db, 0x5f2a, NULL),
@ -456,6 +524,7 @@ struct tlvdb *emv_pki_perform_cda_ex(const struct emv_pk *enc_pk, const struct t
size_t data_len = 0;
unsigned char *data = emv_pki_decode_message(enc_pk, 5, &data_len,
tlvdb_get(this_db, 0x9f4b, NULL),
2,
un_tlv,
NULL);
if (!data || data_len < 3) {

1
client/emv/emv_pki.h
View file

@ -23,6 +23,7 @@
extern void PKISetStrictExecution(bool se);
unsigned char *emv_pki_sdatl_fill(const struct tlvdb *db, size_t *sdatl_len);
struct emv_pk *emv_pki_recover_issuer_cert(const struct emv_pk *pk, struct tlvdb *db);
struct emv_pk *emv_pki_recover_icc_cert(const struct emv_pk *pk, struct tlvdb *db, const struct tlv *sda_tlv);
struct emv_pk *emv_pki_recover_icc_pe_cert(const struct emv_pk *pk, struct tlvdb *db);

53
client/emv/emvcore.c
View file

@ -596,7 +596,7 @@ int EMVGenerateChallenge(EMVCommandChannel channel, bool LeaveFieldON, uint8_t *
}
int EMVInternalAuthenticate(EMVCommandChannel channel, bool LeaveFieldON, uint8_t *DDOL, size_t DDOLLen, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw, struct tlvdb *tlv) {
return EMVExchange(channel, LeaveFieldON, (sAPDU){0x00, 0x88, 0x00, 0x00, DDOLLen, DDOL}, Result, MaxResultLen, ResultLen, sw, tlv);
return EMVExchangeEx(channel, false, LeaveFieldON, (sAPDU){0x00, 0x88, 0x00, 0x00, DDOLLen, DDOL}, true, Result, MaxResultLen, ResultLen, sw, tlv);
}
int MSCComputeCryptoChecksum(EMVCommandChannel channel, bool LeaveFieldON, uint8_t *UDOL, uint8_t UDOLlen, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw, struct tlvdb *tlv) {
@ -653,7 +653,7 @@ int trSDA(struct tlvdb *tlv) {
struct tlvdb *dac_db = emv_pki_recover_dac(issuer_pk, tlv, sda_tlv);
if (dac_db) {
const struct tlv *dac_tlv = tlvdb_get(dac_db, 0x9f45, NULL);
PrintAndLogEx(NORMAL, "SDA verified OK. (%02hhx:%02hhx)\n", dac_tlv->value[0], dac_tlv->value[1]);
PrintAndLogEx(NORMAL, "SDA verified OK. (Data Authentication Code: %02hhx:%02hhx)\n", dac_tlv->value[0], dac_tlv->value[1]);
tlvdb_add(tlv, dac_db);
} else {
emv_pk_free(issuer_pk);
@ -682,12 +682,12 @@ int trDDA(EMVCommandChannel channel, bool decodeTLV, struct tlvdb *tlv) {
}
const struct tlv *sda_tlv = tlvdb_get(tlv, 0x21, NULL);
if (!sda_tlv || sda_tlv->len < 1) {
/* if (!sda_tlv || sda_tlv->len < 1) { it may be 0!!!!
emv_pk_free(pk);
PrintAndLogEx(WARNING, "Error: Can't find input list for Offline Data Authentication. Exit.");
return 3;
}
*/
struct emv_pk *issuer_pk = emv_pki_recover_issuer_cert(pk, tlv);
if (!issuer_pk) {
emv_pk_free(pk);
@ -710,7 +710,7 @@ int trDDA(EMVCommandChannel channel, bool decodeTLV, struct tlvdb *tlv) {
if (!icc_pk) {
emv_pk_free(pk);
emv_pk_free(issuer_pk);
PrintAndLogEx(WARNING, "Error: ICC setrificate not found. Exit.");
PrintAndLogEx(WARNING, "Error: ICC certificate not found. Exit.");
return 2;
}
PrintAndLogEx(SUCCESS, "ICC PK recovered. RID %02hhx:%02hhx:%02hhx:%02hhx:%02hhx IDX %02hhx CSN %02hhx:%02hhx:%02hhx\n",
@ -725,21 +725,25 @@ int trDDA(EMVCommandChannel channel, bool decodeTLV, struct tlvdb *tlv) {
icc_pk->serial[2]
);
struct emv_pk *icc_pe_pk = emv_pki_recover_icc_pe_cert(issuer_pk, tlv);
if (!icc_pe_pk) {
PrintAndLogEx(WARNING, "WARNING: ICC PE PK recover error. ");
if (tlvdb_get(tlv, 0x9f2d, NULL)) {
struct emv_pk *icc_pe_pk = emv_pki_recover_icc_pe_cert(issuer_pk, tlv);
if (!icc_pe_pk) {
PrintAndLogEx(WARNING, "WARNING: ICC PE PK recover error. ");
} else {
PrintAndLogEx(SUCCESS, "ICC PE PK recovered. RID %02hhx:%02hhx:%02hhx:%02hhx:%02hhx IDX %02hhx CSN %02hhx:%02hhx:%02hhx\n",
icc_pe_pk->rid[0],
icc_pe_pk->rid[1],
icc_pe_pk->rid[2],
icc_pe_pk->rid[3],
icc_pe_pk->rid[4],
icc_pe_pk->index,
icc_pe_pk->serial[0],
icc_pe_pk->serial[1],
icc_pe_pk->serial[2]
);
}
} else {
PrintAndLogEx(SUCCESS, "ICC PE PK recovered. RID %02hhx:%02hhx:%02hhx:%02hhx:%02hhx IDX %02hhx CSN %02hhx:%02hhx:%02hhx\n",
icc_pe_pk->rid[0],
icc_pe_pk->rid[1],
icc_pe_pk->rid[2],
icc_pe_pk->rid[3],
icc_pe_pk->rid[4],
icc_pe_pk->index,
icc_pe_pk->serial[0],
icc_pe_pk->serial[1],
icc_pe_pk->serial[2]
);
PrintAndLogEx(INFO, "ICC PE PK (PIN Encipherment Public Key Certificate) not found.\n");
}
// 9F4B: Signed Dynamic Application Data
@ -781,7 +785,7 @@ int trDDA(EMVCommandChannel channel, bool decodeTLV, struct tlvdb *tlv) {
struct tlvdb *dac_db = emv_pki_recover_dac(issuer_pk, tlv, sda_tlv);
if (dac_db) {
const struct tlv *dac_tlv = tlvdb_get(dac_db, 0x9f45, NULL);
PrintAndLogEx(NORMAL, "SDA verified OK. (%02hhx:%02hhx)\n", dac_tlv->value[0], dac_tlv->value[1]);
PrintAndLogEx(NORMAL, "SDAD verified OK. (Data Authentication Code: %02hhx:%02hhx)\n", dac_tlv->value[0], dac_tlv->value[1]);
tlvdb_add(tlv, dac_db);
} else {
PrintAndLogEx(WARNING, "Error: SSAD verify error");
@ -825,9 +829,16 @@ int trDDA(EMVCommandChannel channel, bool decodeTLV, struct tlvdb *tlv) {
if (len < 3 ) {
PrintAndLogEx(WARNING, "Error: Internal Authenticate format1 parsing error. length=%d", len);
} else {
// parse response 0x80
struct tlvdb *t80 = tlvdb_parse_multi(buf, len);
const struct tlv * t80tlv = tlvdb_get_tlv(t80);
// 9f4b Signed Dynamic Application Data
dda_db = tlvdb_fixed(0x9f4b, len - 2, buf + 2);
dda_db = tlvdb_fixed(0x9f4b, t80tlv->len, t80tlv->value);
tlvdb_add(tlv, dda_db);
tlvdb_free(t80);
if (decodeTLV){
PrintAndLogEx(NORMAL, "* * Decode response format 1:");
TLVPrintFromTLV(dda_db);

15
client/emv/tlv.c
View file

@ -359,12 +359,15 @@ void tlvdb_add(struct tlvdb *tlvdb, struct tlvdb *other)
tlvdb->next = other;
}
void tlvdb_change_or_add_node(struct tlvdb *tlvdb, tlv_tag_t tag, size_t len, const unsigned char *value)
void tlvdb_change_or_add_node_ex(struct tlvdb *tlvdb, tlv_tag_t tag, size_t len, const unsigned char *value, struct tlvdb **tlvdb_elm)
{
struct tlvdb *telm = tlvdb_find_full(tlvdb, tag);
if (telm == NULL) {
// new tlv element
tlvdb_add(tlvdb, tlvdb_fixed(tag, len, value));
struct tlvdb *elm = tlvdb_fixed(tag, len, value);
tlvdb_add(tlvdb, elm);
if (tlvdb_elm)
*tlvdb_elm = elm;
} else {
// the same tlv structure
if (telm->tag.tag == tag && telm->tag.len == len && !memcmp(telm->tag.value, value, len))
@ -400,11 +403,19 @@ void tlvdb_change_or_add_node(struct tlvdb *tlvdb, tlv_tag_t tag, size_t len, co
// free old element with childrens
telm->next = NULL;
tlvdb_free(telm);
if (tlvdb_elm)
*tlvdb_elm = tnewelm;
}
return;
}
void tlvdb_change_or_add_node(struct tlvdb *tlvdb, tlv_tag_t tag, size_t len, const unsigned char *value)
{
tlvdb_change_or_add_node_ex(tlvdb, tag, len, value, NULL);
}
void tlvdb_visit(const struct tlvdb *tlvdb, tlv_cb cb, void *data, int level)
{
struct tlvdb *next = NULL;

1
client/emv/tlv.h
View file

@ -50,6 +50,7 @@ struct tlvdb *tlvdb_find_path(struct tlvdb *tlvdb, tlv_tag_t tag[]);
void tlvdb_add(struct tlvdb *tlvdb, struct tlvdb *other);
void tlvdb_change_or_add_node(struct tlvdb *tlvdb, tlv_tag_t tag, size_t len, const unsigned char *value);
void tlvdb_change_or_add_node_ex(struct tlvdb *tlvdb, tlv_tag_t tag, size_t len, const unsigned char *value, struct tlvdb **tlvdb_elm);
void tlvdb_visit(const struct tlvdb *tlvdb, tlv_cb cb, void *data, int level);
const struct tlv *tlvdb_get(const struct tlvdb *tlvdb, tlv_tag_t tag, const struct tlv *prev);

10
common/i2c.c
View file

@ -161,10 +161,11 @@ bool WaitSCL_L(void) {
return WaitSCL_L_delay(15000);
}
// Wait max 300ms or until SCL goes LOW.
// Wait max 1800ms or until SCL goes LOW.
// It timeout reading response from card
// Which ever comes first
bool WaitSCL_L_300ms(void){
volatile uint16_t delay = 310;
bool WaitSCL_L_timeout(void){
volatile uint16_t delay = 1800;
while ( delay-- ) {
// exit on SCL LOW
if (!SCL_read)
@ -193,7 +194,8 @@ bool I2C_Start(void) {
bool I2C_WaitForSim() {
if (!WaitSCL_L_300ms())
// wait for data from card
if (!WaitSCL_L_timeout())
return false;
// 8051 speaks with smart card.