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OpenPGP: update card capabilities from historical bytes 

According to OpenPGP card specs 1.1 & 2.0 historical bytes in the ATR
indicate capabilities:
* bit 0x40 of the 3rd byte of the compact-TLV entry with TL 0x73 tells
  whether the card supports extended Lc/Le fields in APDUs.

Signed-off-by: Peter Marschall <peter@adpm.de>

git-svn-id: https://www.opensc-project.org/svnp/opensc/trunk@5478 c6295689-39f2-0310-b995-f0e70906c6a9
This commit is contained in:
martin 2011-05-23 17:31:39 +00:00
parent 1bb69cb847
commit 1911db7532
1 changed files with 15 additions and 0 deletions
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15
src/libopensc/card-openpgp.c
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@ -207,6 +207,21 @@ pgp_init(sc_card_t *card)
return SC_ERROR_OUT_OF_MEMORY;
}
/* update card capabilities from ATR */
if (card->atr.len > 0) {
unsigned char *hist_bytes = card->atr.value;
size_t len = card->atr.len;
size_t i = 0;
while ((i < len) && (hist_bytes[i] != 0x73))
i++;
/* bit 0x40 in byte 3 of TL 0x73 means "extended Le/Lc" */
if ((hist_bytes[i] == 0x73) && (len > i+3) &&
(hist_bytes[i+3] & 0x40))
card->caps |= SC_CARD_CAP_APDU_EXT;
}
return SC_SUCCESS;
}