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/* imported from SCEZ chipcard library - T=1 routines
* This is probably the first full free/open source T=1 implementation.
* Copyright Matthias Bruestle 1999-2002
* For licensing, see the file LICENCE
*/
#include <stdio.h>
#include <string.h>
#include <PCSC/wintypes.h>
#include <PCSC/pcsclite.h>
#include <sys/types.h>
#include "ifdhandler.h"
#include "etoken.h"
#define min( a, b ) ( ( ( a ) < ( b ) ) ? ( a ) : ( b ) )
#define T1_MAX_BLKLEN 3+256+2+2
/* S-Block parameter */
#define T1_S_RESYNCH 0x00
#define T1_S_IFS 0x01
#define T1_S_ABORT 0x02
#define T1_S_WTX 0x03
#define T1_S_REQUEST 0x00
#define T1_S_RESPONSE 0x01
/* R-Block parameter */
#define T1_R_OK 0x00
#define T1_R_EDC_ERROR 0x01
#define T1_R_OTHER_ERROR 0x02
/* ISO STD 3309 */
/* From: medin@catbyte.b30.ingr.com (Dave Medin)
* Subject: CCITT checksums
* Newsgroups: sci.electronics
* Date: Mon, 7 Dec 1992 17:33:39 GMT
*/
/* Correct Table? */
static unsigned short crctab[256] = {
0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};
/* Returns LRC of data */
u_int8_t calculate_lrc(const u_int8_t * data, int datalen)
{
u_int8_t lrc = 0x00;
int i;
for (i = 0; i < datalen; i++)
lrc ^= data[i];
return lrc;
}
/* Calculates CRC of data */
void calculate_crc(const u_int8_t * data, int datalen, u_int8_t * crc)
{
int i;
unsigned short tmpcrc = 0xFFFF;
for (i = 0; i < datalen; i++)
tmpcrc =
((tmpcrc >> 8) & 0xFF) ^ crctab[(tmpcrc ^ *data++) &
0xFF];
crc[0] = (tmpcrc >> 8) & 0xFF;
crc[1] = tmpcrc & 0xFF;
}
/* Appends RC */
int append_rc(struct eToken *eToken, u_int8_t * data, int *datalen)
{
if (eToken->rc == T1_CHECKSUM_LRC) {
data[*datalen] = calculate_lrc(data, *datalen);
*datalen += 1;
return IFD_SUCCESS;
} else if (eToken->rc == T1_CHECKSUM_CRC) {
calculate_crc(data, *datalen, data + *datalen);
*datalen += 2;
return IFD_SUCCESS;
}
return IFD_ERROR_NOT_SUPPORTED;
}
/* Checks RC. */
int check_rc(struct eToken *eToken, const u_int8_t * data, int datalen)
{
u_int8_t rc[2];
u_int8_t cmp[2];
if (eToken->rc == T1_CHECKSUM_LRC) {
/* Check LEN. */
if ((data[2] + 3 + 1) > datalen)
return 0;
rc[1] = data[data[2] + 3];
cmp[1] = calculate_lrc(data, data[2] + 3);
return (rc[1] == cmp[1]);
} else if (eToken->rc == T1_CHECKSUM_CRC) {
/* Check LEN. */
if ((data[2] + 3 + 2) > datalen)
return 0;
calculate_crc(data, data[2] + 3, cmp);
return (memcmp(data + data[2] + 3, cmp, 2) == 0);
}
return 0;
}
/* Builds S-Block */
int build_neg_block(struct eToken *eToken, int type, int dir, int param,
u_int8_t * block, int *len)
{
block[0] = eToken->nad;
switch (type) {
case T1_S_RESYNCH:
if (dir == T1_S_REQUEST)
block[1] = 0xC0;
else
block[1] = 0xE0;
block[2] = 0x00;
*len = 3;
break;
case T1_S_IFS:
if (dir == T1_S_REQUEST)
block[1] = 0xC1;
else
block[1] = 0xE1;
block[2] = 0x01;
block[3] = (u_int8_t) param;
*len = 4;
break;
case T1_S_ABORT:
if (dir == T1_S_REQUEST)
block[1] = 0xC2;
else
block[1] = 0xE2;
block[2] = 0x00;
*len = 3;
break;
case T1_S_WTX:
if (dir == T1_S_REQUEST)
block[1] = 0xC3;
else
block[1] = 0xE3;
block[2] = 0x01;
block[3] = (u_int8_t) param;
*len = 4;
break;
default:
return (IFD_ERROR_NOT_SUPPORTED);
}
return append_rc(eToken, block, len);
}
/* Builds R-Block */
int build_retry_block(struct eToken *eToken, int type, u_int8_t * block,
int *len)
{
block[0] = eToken->nad;
block[2] = 0x00;
switch (type) {
case T1_R_OK:
if (eToken->nr)
block[1] = 0x90;
else
block[1] = 0x80;
break;
case T1_R_EDC_ERROR:
if (eToken->nr)
block[1] = 0x91;
else
block[1] = 0x81;
break;
case T1_R_OTHER_ERROR:
if (eToken->nr)
block[1] = 0x92;
else
block[1] = 0x82;
break;
default:
return IFD_ERROR_NOT_SUPPORTED;
}
*len = 3;
return append_rc(eToken, block, len);
}
/* Builds I-Block */
int build_data_block(struct eToken *eToken, int more,
const u_int8_t * data, int datalen, u_int8_t * block,
int *blocklen)
{
block[0] = eToken->nad;
block[1] = 0x00;
if (eToken->ns)
block[1] |= 0x40;
if (more)
block[1] |= 0x20;
if (datalen > eToken->ifsc)
return IFD_COMMUNICATION_ERROR;
block[2] = (u_int8_t) datalen;
memcpy(block + 3, data, datalen);
*blocklen = datalen + 3;
return append_rc(eToken, block, blocklen);
}
/* Returns N(R) or N(S) from R/I-Block. */
int get_sequence(const u_int8_t * block)
{
if ((block[1] & 0xC0) == 0x80) {
return (block[1] & 0x10) ? 0x01 : 0x00;
}
if ((block[1] & 0x80) == 0x00) {
return (block[1] & 0x40) ? 0x01 : 0x00;
}
return 0;
}
int send_command(struct eToken *eToken, u_int8_t * apdu_cmd,
u_int8_t * apdu_rsp, int apdu_cmdlen, int *apdu_rsplen)
{
int sendptr = 0; /* Points to begining of unsent data. */
int sendlen;
u_int8_t block[T1_MAX_BLKLEN];
u_int8_t rblock[T1_MAX_BLKLEN];
int blocklen;
int rblocklen;
u_int8_t rsp[256 + 3];
u_int8_t rsplen = 0;
int more = 1; /* More data to send. */
int lastiicc = 0; /* It's ICCs turn to send I-Blocks. */
int rc;
int timeouts = 0;
int errcntr = 0;
int rerrcntr = 0;
*apdu_rsplen = 0;
sendlen = min(apdu_cmdlen - sendptr, eToken->ifsc);
if (sendlen == (apdu_cmdlen - sendptr))
more = 0;
rc = build_data_block(eToken, more, apdu_cmd, sendlen, block,
&blocklen);
if (rc) {
goto cleanup;
}
sendptr += sendlen;
while (1) {
rblocklen = sizeof(block);
rc = usb_transfer(eToken, block, rblock, blocklen,
&rblocklen);
/* communication error ? try three times. */
if (!rc) {
timeouts++;
if (timeouts > 3) {
rc = IFD_COMMUNICATION_ERROR;
goto cleanup;
}
rc = build_retry_block(eToken, T1_R_OTHER_ERROR,
block, &blocklen);
if (rc) {
goto cleanup;
}
continue;
}
/* ah, no communications error. reset counter. */
timeouts = 0;
/* length or rc error ? try three times. */
if (!check_rc(eToken, rblock, rblocklen)) {
errcntr++;
if (errcntr > 3) {
rc = IFD_COMMUNICATION_ERROR;
goto cleanup;
}
rc = build_retry_block(eToken, T1_R_EDC_ERROR,
block, &blocklen);
if (rc) {
goto cleanup;
}
continue;
}
/* ah, no length or rc error. reset counter. */
errcntr = 0;
/* shall we resend the last block ? try thee times. */
if ((rblock[1] & 0xC0) == 0x80) {
rerrcntr++;
if (rerrcntr > 3) {
rc = IFD_COMMUNICATION_ERROR;
goto cleanup;
}
if (lastiicc) {
/* Card is sending I-Blocks, so send R-Block. */
rc = build_retry_block(eToken, T1_R_OK,
block, &blocklen);
if (rc) {
goto cleanup;
}
continue;
}
if (get_sequence(rblock) == eToken->ns) {
/* N(R) is old N(S),
* so resend I-Block. */
sendptr -= sendlen;
} else {
/* N(R) is next N(S),
* so make next I-Block and send it. */
/* Check if data available. */
if (more == 0) {
/* last block was with pcb: bit6=0
* (no more following blocks)
* so there is no more data to send.
* if the card is waiting for
* additional data, then it is wrong.
* comm error! */
rc = IFD_COMMUNICATION_ERROR;
goto cleanup;
}
/* Change N(S) to new value. */
eToken->ns ^= 1;
/* Make next I-Block. */
/* Clear error counter */
rerrcntr = 0;
}
sendlen = min(apdu_cmdlen - sendptr, eToken->ifsc);
if (sendlen == (apdu_cmdlen - sendptr)) {
more = 0;
}
rc = build_data_block(eToken, more, apdu_cmd +
sendptr, sendlen, block,
&blocklen);
if (rc) {
goto cleanup;
}
sendptr += sendlen;
continue;
}
/* we shall not resend the last block ? reset error counter. */
rerrcntr = 0;
/* I-Block */
if ((rblock[1] & 0x80) == 0x00) {
if (!lastiicc) {
/* Change N(S) to new value. */
eToken->ns ^= 1;
}
lastiicc = 1;
if (get_sequence(rblock) != eToken->nr) {
/* Card is sending wrong I-Block, so send R-Block. */
rc = build_retry_block(eToken,
T1_R_OTHER_ERROR,
block, &blocklen);
if (rc) {
goto cleanup;
}
continue;
}
/* Copy data. */
if (rblock[2] > (256 + 2 - rsplen)) {
rc = IFD_COMMUNICATION_ERROR;
goto cleanup;
}
memcpy(rsp + rsplen, rblock + 3, rblock[2]);
rsplen += rblock[2];
if ((rblock[1] >> 5) & 1) {
/* More data available. */
/* Change N(R) to new value. */
eToken->nr ^= 1;
/* more fragments to come */
rc = build_retry_block(eToken, T1_R_OK,
block, &blocklen);
if (rc) {
goto cleanup;
}
continue;
}
/* Last block. */
/* Change N(R) to new value. */
eToken->nr ^= 1;
if (rsplen < 2) {
rc = IFD_COMMUNICATION_ERROR;
goto cleanup;
}
memcpy(apdu_rsp, rsp, rsplen);
*apdu_rsplen = rsplen;
rc = IFD_SUCCESS;
goto cleanup;
}
/* the card want's to set a different ifsc. */
if (rblock[1] == 0xC1) {
/* acknowledge */
rc = build_neg_block(eToken, T1_S_IFS,
T1_S_RESPONSE, rblock[3],
block, &blocklen);
if (rc) {
goto cleanup;
}
eToken->ifsc = rblock[3];
continue;
}
/* S-Block ABORT Request */
if (rblock[1] == 0xC2) {
rc = IFD_COMMUNICATION_ERROR;
goto cleanup;
}
}
cleanup:
memset(block, 0, sizeof(block));
memset(rblock, 0, sizeof(rblock));
memset(rsp, 0, sizeof(rsp));
return rc;
}
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