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Applied exact length hack.

This commit is contained in:
Werner Koch 2007-08-01 18:25:32 +00:00
parent cc25f43651
commit c850656d28
2 changed files with 16 additions and 2 deletions
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5
scd/ChangeLog
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@ -1,3 +1,8 @@
2007-08-01 Werner Koch <wk@g10code.com>
* apdu.c (send_le): Implement exact length hack. Suggested by
Sten Lindgren.
2007-07-05 Werner Koch <wk@g10code.com>
* command.c (has_option_name, skip_options): New.

13
scd/apdu.c
View File

@ -2609,7 +2609,8 @@ send_le (int slot, int class, int ins, int p0, int p1,
unsigned char apdu[5+256+1];
size_t apdulen;
int sw;
long rc; /* we need a long here due to PC/SC. */
long rc; /* We need a long here due to PC/SC. */
int did_exact_length_hack = 0;
if (slot < 0 || slot >= MAX_READER || !reader_table[slot].used )
return SW_HOST_NO_DRIVER;
@ -2648,6 +2649,7 @@ send_le (int slot, int class, int ins, int p0, int p1,
assert (sizeof (apdu) >= apdulen);
/* As safeguard don't pass any garbage from the stack to the driver. */
memset (apdu+apdulen, 0, sizeof (apdu) - apdulen);
exact_length_hack:
resultlen = RESULTLEN;
rc = send_apdu (slot, apdu, apdulen, result, &resultlen, pininfo);
if (rc || resultlen < 2)
@ -2658,7 +2660,14 @@ send_le (int slot, int class, int ins, int p0, int p1,
return rc? rc : SW_HOST_INCOMPLETE_CARD_RESPONSE;
}
sw = (result[resultlen-2] << 8) | result[resultlen-1];
/* store away the returned data but strip the statusword. */
if (!did_exact_length_hack && SW_EXACT_LENGTH_P (sw))
{
apdu[apdulen-1] = (sw & 0x00ff);
did_exact_length_hack = 1;
goto exact_length_hack;
}
/* Store away the returned data but strip the statusword. */
resultlen -= 2;
if (DBG_CARD_IO)
{