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/* atr.c - ISO 7816 ATR functions
* Copyright (C) 2003, 2011 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gpg-error.h>
#include "../common/logging.h"
#include "atr.h"
static int const fi_table[16] = { 0, 372, 558, 744, 1116,1488, 1860, -1,
-1, 512, 768, 1024, 1536, 2048, -1, -1 };
static int const di_table[16] = { -1, 1, 2, 4, 8, 16, -1, -1,
0, -1, -2, -4, -8, -16, -32, -64};
/* Dump the ATR in (BUFFER,BUFLEN) to a human readable format and
return that as a malloced buffer. The caller must release this
buffer using es_free! On error this function returns NULL and sets
ERRNO. */
char *
atr_dump (const void *buffer, size_t buflen)
{
const unsigned char *atr = buffer;
size_t atrlen = buflen;
estream_t fp;
int have_ta, have_tb, have_tc, have_td;
int n_historical;
int idx, val;
unsigned char chksum;
char *result;
fp = es_fopenmem (0, "rwb,samethread");
if (!fp)
return NULL;
if (!atrlen)
{
es_fprintf (fp, "error: empty ATR\n");
goto bailout;
}
for (idx=0; idx < atrlen ; idx++)
es_fprintf (fp, "%s%02X", idx?" ":"", atr[idx]);
es_putc ('\n', fp);
if (*atr == 0x3b)
es_fputs ("Direct convention\n", fp);
else if (*atr == 0x3f)
es_fputs ("Inverse convention\n", fp);
else
es_fprintf (fp,"error: invalid TS character 0x%02x\n", *atr);
if (!--atrlen)
goto bailout;
atr++;
chksum = *atr;
for (idx=1; idx < atrlen-1; idx++)
chksum ^= atr[idx];
have_ta = !!(*atr & 0x10);
have_tb = !!(*atr & 0x20);
have_tc = !!(*atr & 0x40);
have_td = !!(*atr & 0x80);
n_historical = (*atr & 0x0f);
es_fprintf (fp, "%d historical characters indicated\n", n_historical);
if (have_ta + have_tb + have_tc + have_td + n_historical > atrlen)
es_fputs ("error: ATR shorter than indicated by format character\n", fp);
if (!--atrlen)
goto bailout;
atr++;
if (have_ta)
{
es_fputs ("TA1: F=", fp);
val = fi_table[(*atr >> 4) & 0x0f];
if (!val)
es_fputs ("internal clock", fp);
else if (val == -1)
es_fputs ("RFU", fp);
else
es_fprintf (fp, "%d", val);
es_fputs (" D=", fp);
val = di_table[*atr & 0x0f];
if (!val)
es_fputs ("[impossible value]\n", fp);
else if (val == -1)
es_fputs ("RFU\n", fp);
else if (val < 0 )
es_fprintf (fp, "1/%d\n", val);
else
es_fprintf (fp, "%d\n", val);
if (!--atrlen)
goto bailout;
atr++;
}
if (have_tb)
{
es_fprintf (fp, "TB1: II=%d PI1=%d%s\n",
((*atr >> 5) & 3), (*atr & 0x1f),
(*atr & 0x80)? " [high bit not cleared]":"");
if (!--atrlen)
goto bailout;
atr++;
}
if (have_tc)
{
if (*atr == 255)
es_fputs ("TC1: guard time shortened to 1 etu\n", fp);
else
es_fprintf (fp, "TC1: (extra guard time) N=%d\n", *atr);
if (!--atrlen)
goto bailout;
atr++;
}
if (have_td)
{
have_ta = !!(*atr & 0x10);
have_tb = !!(*atr & 0x20);
have_tc = !!(*atr & 0x40);
have_td = !!(*atr & 0x80);
es_fprintf (fp, "TD1: protocol T%d supported\n", (*atr & 0x0f));
if (have_ta + have_tb + have_tc + have_td + n_historical > atrlen)
es_fputs ("error: ATR shorter than indicated by format character\n",
fp);
if (!--atrlen)
goto bailout;
atr++;
}
else
have_ta = have_tb = have_tc = have_td = 0;
if (have_ta)
{
es_fprintf (fp, "TA2: (PTS) %stoggle, %splicit, T=%02X\n",
(*atr & 0x80)? "no-":"",
(*atr & 0x10)? "im": "ex",
(*atr & 0x0f));
if ((*atr & 0x60))
es_fprintf (fp, "note: reserved bits are set (TA2=0x%02X)\n", *atr);
if (!--atrlen)
goto bailout;
atr++;
}
if (have_tb)
{
es_fprintf (fp, "TB2: PI2=%d\n", *atr);
if (!--atrlen)
goto bailout;
atr++;
}
if (have_tc)
{
es_fprintf (fp, "TC2: PWI=%d\n", *atr);
if (!--atrlen)
goto bailout;
atr++;
}
if (have_td)
{
have_ta = !!(*atr & 0x10);
have_tb = !!(*atr & 0x20);
have_tc = !!(*atr & 0x40);
have_td = !!(*atr & 0x80);
es_fprintf (fp, "TD2: protocol T%d supported\n", *atr & 0x0f);
if (have_ta + have_tb + have_tc + have_td + n_historical > atrlen)
es_fputs ("error: ATR shorter than indicated by format character\n",
fp);
if (!--atrlen)
goto bailout;
atr++;
}
else
have_ta = have_tb = have_tc = have_td = 0;
for (idx = 3; have_ta || have_tb || have_tc || have_td; idx++)
{
if (have_ta)
{
es_fprintf (fp, "TA%d: IFSC=%d\n", idx, *atr);
if (!--atrlen)
goto bailout;
atr++;
}
if (have_tb)
{
es_fprintf (fp, "TB%d: BWI=%d CWI=%d\n",
idx, (*atr >> 4) & 0x0f, *atr & 0x0f);
if (!--atrlen)
goto bailout;
atr++;
}
if (have_tc)
{
es_fprintf (fp, "TC%d: 0x%02X\n", idx, *atr);
if (!--atrlen)
goto bailout;
atr++;
}
if (have_td)
{
have_ta = !!(*atr & 0x10);
have_tb = !!(*atr & 0x20);
have_tc = !!(*atr & 0x40);
have_td = !!(*atr & 0x80);
es_fprintf (fp, "TD%d: protocol T%d supported\n", idx, *atr & 0x0f);
if (have_ta + have_tb + have_tc + have_td + n_historical > atrlen)
es_fputs ("error: "
"ATR shorter than indicated by format character\n",
fp);
if (!--atrlen)
goto bailout;
atr++;
}
else
have_ta = have_tb = have_tc = have_td = 0;
}
if (n_historical + 1 > atrlen)
es_fputs ("error: ATR shorter than required for historical bytes "
"and checksum\n", fp);
if (n_historical)
{
es_fputs ("HCH:", fp);
for (; n_historical && atrlen ; n_historical--, atrlen--, atr++)
es_fprintf (fp, " %02X", *atr);
es_putc ('\n', fp);
}
if (!atrlen)
es_fputs ("error: checksum missing\n", fp);
else if (*atr == chksum)
es_fprintf (fp, "TCK: %02X (good)\n", *atr);
else
es_fprintf (fp, "TCK: %02X (bad; computed %02X)\n", *atr, chksum);
atrlen--;
if (atrlen)
es_fprintf (fp, "error: %u bytes garbage at end of ATR\n",
(unsigned int)atrlen );
bailout:
es_putc ('\0', fp); /* We want a string. */
if (es_fclose_snatch (fp, (void**)&result, NULL))
{
log_error ("oops: es_fclose_snatch failed: %s\n", strerror (errno));
return NULL;
}
return result;
}

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Mime Type
text/x-c
Expires
Mon, Aug 25, 11:03 PM (1 d, 3 h)
Storage Engine
local-disk
Storage Format
Raw Data
Storage Handle
8f/38/74ac1705af858a513bd022e6465a

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