diff options
Diffstat (limited to 'scd/iso7816.c')
| -rw-r--r-- | scd/iso7816.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/scd/iso7816.c b/scd/iso7816.c index a2a4034ef..bb07911cc 100644 --- a/scd/iso7816.c +++ b/scd/iso7816.c @@ -315,6 +315,39 @@ 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 |