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card: Let the APDU command prints a description of the status word.

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* tools/card-call-scd.c (scd_apdu_strerror): New.
* tools/gpg-card.c (cmd_apdu): Print a description.
--

Pretty convenient to explore smartcards.
This commit is contained in:
Werner Koch 2020-11-27 11:28:16 +01:00
parent 0e34683a6c
commit ad469609b1
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GPG key ID: E3FDFF218E45B72B
3 changed files with 43 additions and 1 deletions
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30
tools/card-call-scd.c
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@ -1709,3 +1709,33 @@ agent_get_s2k_count (void)
return count;
}
/* Return a malloced string describing the statusword SW. On error
* NULL is returned. */
char *
scd_apdu_strerror (unsigned int sw)
{
gpg_error_t err;
char line[ASSUAN_LINELENGTH];
membuf_t data;
char *buf;
err = start_agent (0);
if (err)
return NULL;
init_membuf (&data, 64);
snprintf (line, sizeof line, "SCD GETINFO apdu_strerror 0x%x", sw);
err = assuan_transact (agent_ctx, line, put_membuf_cb, &data,
NULL, NULL, NULL, NULL);
if (err)
{
xfree (get_membuf (&data, NULL));
return NULL;
}
put_membuf (&data, "", 1);
buf = get_membuf (&data, NULL);
return buf;
}