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-rw-r--r--scd/atr.c290
1 files changed, 290 insertions, 0 deletions
diff --git a/scd/atr.c b/scd/atr.c
new file mode 100644
index 0000000..4f5a3b8
--- /dev/null
+++ b/scd/atr.c
@@ -0,0 +1,290 @@
+/* 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 <assert.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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