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scd: Factor common PIN status check out.

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* scd/iso7816.h (ISO7816_VERIFY_ERROR): New.
(ISO7816_VERIFY_NO_PIN): New.
(ISO7816_VERIFY_BLOCKED): New.
(ISO7816_VERIFY_NULLPIN): New.
(ISO7816_VERIFY_NOT_NEEDED): New.
* scd/iso7816.c (iso7816_verify_status): New.
* scd/app-nks.c (get_chv_status): Use new function.
* scd/app-piv.c (get_chv_status): Ditto.
(verify_chv): Ditto.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2020-04-07 18:25:41 +02:00
parent 5ec1f66793
commit 60d018f6a9
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GPG key ID: E3FDFF218E45B72B
5 changed files with 58 additions and 83 deletions
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33
scd/iso7816.c
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@ -339,6 +339,39 @@ iso7816_verify (int slot, int chvno, const char *chv, size_t chvlen)
return map_sw (sw);
}
/* Some cards support a VERIFY command variant to check the status of
* the the CHV without a need to try a CHV. In contrast to the other
* functions this function returns the special codes ISO7816_VERIFY_*
* or a non-negative number with the left attempts. */
int
iso7816_verify_status (int slot, int chvno)
{
unsigned char apdu[4];
unsigned int sw;
int result;
apdu[0] = 0x00;
apdu[1] = ISO7816_VERIFY;
apdu[2] = 0x00;
apdu[3] = chvno;
if (!iso7816_apdu_direct (slot, apdu, 4, 0, &sw, NULL, NULL))
result = ISO7816_VERIFY_NOT_NEEDED; /* Not returned by all cards. */
else if (sw == 0x6a88 || sw == 0x6a80)
result = ISO7816_VERIFY_NO_PIN;
else if (sw == 0x6983)
result = ISO7816_VERIFY_BLOCKED;
else if (sw == 0x6985)
result = ISO7816_VERIFY_NULLPIN; /* TCOS card */
else if ((sw & 0xfff0) == 0x63C0)
result = (sw & 0x000f);
else
result = ISO7816_VERIFY_ERROR;
return result;
}
/* Perform a CHANGE_REFERENCE_DATA command on SLOT for the card holder
verification vector CHVNO. With PININFO non-NULL the pinpad of the
reader will be used. If IS_EXCHANGE is 0, a "change reference