/src/opensc/src/libopensc/card-cardos-common.c
Line | Count | Source |
1 | | /* |
2 | | * card-cardos-common.c: Common code for CardOS based cards |
3 | | * |
4 | | * Copyright (C) 2024 Mario Haustein <mario.haustein@hrz.tu-chemnitz.de> |
5 | | * |
6 | | * This library is free software; you can redistribute it and/or |
7 | | * modify it under the terms of the GNU Lesser General Public |
8 | | * License as published by the Free Software Foundation; either |
9 | | * version 2.1 of the License, or (at your option) any later version. |
10 | | * |
11 | | * This library is distributed in the hope that it will be useful, |
12 | | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | | * Lesser General Public License for more details. |
15 | | * |
16 | | * You should have received a copy of the GNU Lesser General Public |
17 | | * License along with this library; if not, write to the Free Software |
18 | | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
19 | | */ |
20 | | |
21 | | #include <stdlib.h> |
22 | | #include <string.h> |
23 | | |
24 | | #ifdef HAVE_CONFIG_H |
25 | | #include "config.h" |
26 | | #endif |
27 | | |
28 | | #include "card-cardos-common.h" |
29 | | #include "internal.h" |
30 | | |
31 | | int |
32 | | cardos_ec_compute_shared_value(struct sc_card *card, |
33 | | const u8 *crgram, size_t crgram_len, |
34 | | u8 *out, size_t outlen) |
35 | 0 | { |
36 | 0 | int r; |
37 | 0 | struct sc_apdu apdu; |
38 | 0 | u8 *sbuf = NULL; |
39 | |
|
40 | 0 | if (card == NULL || crgram == NULL || out == NULL) { |
41 | 0 | return SC_ERROR_INVALID_ARGUMENTS; |
42 | 0 | } |
43 | 0 | LOG_FUNC_CALLED(card->ctx); |
44 | 0 | sc_log(card->ctx, "CardOS compute shared value: in-len %" SC_FORMAT_LEN_SIZE_T "u, out-len %" SC_FORMAT_LEN_SIZE_T "u", crgram_len, outlen); |
45 | | |
46 | | /* Ensure public key is provided in uncompressed format (indicator byte |
47 | | * 0x04 followed by X and Y coordinate. */ |
48 | 0 | if (crgram_len % 2 == 0 || crgram[0] != 0x04) { |
49 | 0 | LOG_FUNC_RETURN(card->ctx, SC_ERROR_INVALID_ARGUMENTS); |
50 | 0 | } |
51 | | |
52 | | /* strip indicator byte */ |
53 | 0 | crgram++; |
54 | 0 | crgram_len--; |
55 | |
|
56 | 0 | sbuf = malloc(crgram_len + 2); |
57 | 0 | if (sbuf == NULL) |
58 | 0 | return SC_ERROR_OUT_OF_MEMORY; |
59 | | |
60 | | /* INS: 0x2A PERFORM SECURITY OPERATION |
61 | | * P1: 0x80 Resp: Plain value |
62 | | * P2: 0xA6 Cmd: Control reference template for key agreement */ |
63 | 0 | sc_format_apdu(card, &apdu, SC_APDU_CASE_4, 0x2A, 0x80, 0xA6); |
64 | 0 | apdu.resp = out; |
65 | 0 | apdu.resplen = outlen; |
66 | 0 | apdu.le = outlen; |
67 | |
|
68 | 0 | sbuf[0] = 0x9c; /* context specific ASN.1 tag */ |
69 | 0 | sbuf[1] = crgram_len; |
70 | 0 | memcpy(sbuf + 2, crgram, crgram_len); |
71 | 0 | apdu.data = sbuf; |
72 | 0 | apdu.lc = crgram_len + 2; |
73 | 0 | apdu.datalen = crgram_len + 2; |
74 | |
|
75 | 0 | iso7816_fixup_transceive_length(card, &apdu); |
76 | 0 | r = sc_transmit_apdu(card, &apdu); |
77 | 0 | sc_mem_clear(sbuf, crgram_len + 2); |
78 | 0 | free(sbuf); |
79 | 0 | LOG_TEST_RET(card->ctx, r, "APDU transmit failed"); |
80 | | |
81 | 0 | if (apdu.sw1 == 0x90 && apdu.sw2 == 0x00) |
82 | 0 | LOG_FUNC_RETURN(card->ctx, (int)apdu.resplen); |
83 | 0 | else |
84 | 0 | LOG_FUNC_RETURN(card->ctx, sc_check_sw(card, apdu.sw1, apdu.sw2)); |
85 | 0 | } |