opensc-sys 0.1.1

FFI bindings to OpenSC
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132

/*
 * ef-atr.c: Stuff for handling EF(GDO)
 *
 * Copyright (C) 2017  Frank Morgner <frankmorgner@gmail.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "asn1.h"
#include "internal.h"
#include <stdlib.h>
#include <string.h>

static int
sc_parse_ef_gdo_content(const unsigned char *gdo, size_t gdo_len,
		unsigned char *iccsn, size_t *iccsn_len,
		unsigned char *chn, size_t *chn_len)
{
	int r = SC_SUCCESS, iccsn_found = 0, chn_found = 0;
	const unsigned char *p = gdo;
	size_t left = gdo_len;

	while (left >= 2) {
		unsigned int cla, tag;
		size_t tag_len;

		r = sc_asn1_read_tag(&p, left, &cla, &tag, &tag_len);
		if (r != SC_SUCCESS) {
			if (r == SC_ERROR_ASN1_END_OF_CONTENTS) {
				/* not enough data */
				r = SC_SUCCESS;
			}
			break;
		}
		if (p == NULL) {
			/* done parsing */
			break;
		}

		if (cla == SC_ASN1_TAG_APPLICATION) {
			switch (tag) {
				case 0x1A:
					iccsn_found = 1;
					if (iccsn && iccsn_len) {
						memcpy(iccsn, p, MIN(tag_len, *iccsn_len));
						*iccsn_len = MIN(tag_len, *iccsn_len);
					}
					break;
				case 0x1F20:
					chn_found = 1;
					if (chn && chn_len) {
						memcpy(chn, p, MIN(tag_len, *chn_len));
						*chn_len = MIN(tag_len, *chn_len);
					}
					break;
			}
		}

		p += tag_len;
		left = gdo_len - (p - gdo);
	}

	if (!iccsn_found && iccsn_len)
		*iccsn_len = 0;
	if (!chn_found && chn_len)
		*chn_len = 0;

	return r;
}



int
sc_parse_ef_gdo(struct sc_card *card,
		unsigned char *iccsn, size_t *iccsn_len,
		unsigned char *chn, size_t *chn_len)
{
	struct sc_context *ctx;
	struct sc_path path;
	struct sc_file *file;
	unsigned char *gdo = NULL;
	size_t gdo_len = 0;
	int r;

	if (!card)
		return SC_ERROR_INVALID_ARGUMENTS;

	ctx = card->ctx;

	LOG_FUNC_CALLED(ctx);

	sc_format_path("3F002F02", &path);
	r = sc_select_file(card, &path, &file);
	LOG_TEST_GOTO_ERR(ctx, r, "Cannot select EF(GDO) file");

	if (file->size) {
		gdo_len = file->size;
	} else {
		gdo_len = 64;
	}
	gdo = malloc(gdo_len);
	if (!gdo) {
		r = SC_ERROR_OUT_OF_MEMORY;
		goto err;
	}

	r = sc_read_binary(card, 0, gdo, gdo_len, 0);
	LOG_TEST_GOTO_ERR(ctx, r, "Cannot read EF(GDO) file");

	r = sc_parse_ef_gdo_content(gdo, r, iccsn, iccsn_len, chn, chn_len);

err:
	sc_file_free(file);
	free(gdo);

	LOG_FUNC_RETURN(ctx, r);
}