2 * Copyright (c) 2001 Markus Friedl. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 RCSID("$OpenBSD: scard.c,v 1.5 2001/07/04 23:13:09 markus Exp $");
29 #include <openssl/engine.h>
38 #define INS_DECRYPT 0x10
39 #define INS_GET_KEYLENGTH 0x20
40 #define INS_GET_PUBKEY 0x30
41 #define INS_GET_RESPONSE 0xc0
43 #define MAX_BUF_SIZE 256
45 static int sc_fd = -1;
46 static int sc_reader_num = -1;
47 static int cla = 0x00; /* class */
49 /* interface to libsectok */
60 sc_fd = sectok_open(sc_reader_num, 0, &sw);
62 error("sectok_open failed: %s", sectok_get_sw(sw));
65 if (sectok_reset(sc_fd, 0, atr, &sw) <= 0) {
66 error("sectok_reset failed: %s", sectok_get_sw(sw));
71 debug("sc_open ok %d", sc_fd);
76 sc_enable_applet(void)
78 u_char contID[2], aid[MAX_BUF_SIZE];
79 int i, len, sw, aid_len;
85 if (sectok_selectfile(sc_fd, cla, root_fid, &sw) < 0) {
86 error("sectok_selectfile root_fid failed: %s",
91 if (sectok_selectfile(sc_fd, cla, contID, &sw) < 0) {
92 error("sectok_selectfile failed: %s", sectok_get_sw(sw));
97 for (i = 0; i < sizeof(aid); i++)
100 sectok_apdu(sc_fd, cla, 0xa4, 0x04, 0, aid_len, aid, 0, NULL, &sw);
101 if (!sectok_swOK(sw)) {
102 error("sectok_apdu failed: %s", sectok_get_sw(sw));
113 error("sc_open failed");
116 if (sc_enable_applet() < 0) {
117 error("sc_enable_applet failed");
124 sc_read_pubkey(Key * k)
137 sectok_apdu(sc_fd, CLA_SSH, INS_GET_KEYLENGTH, 0, 0, 0, NULL,
138 sizeof(buf), buf, &sw);
139 if (!sectok_swOK(sw)) {
140 error("could not obtain key length: %s", sectok_get_sw(sw));
144 len = (buf[0] << 8) | buf[1];
146 debug("INS_GET_KEYLENGTH: len %d sw %s", len, sectok_get_sw(sw));
150 sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
151 if (!sectok_swOK(sw)) {
152 error("could not obtain public key: %s", sectok_get_sw(sw));
156 debug("INS_GET_KEYLENGTH: sw %s", sectok_get_sw(sw));
158 if (BN_bin2bn(n, len, k->rsa->n) == NULL) {
159 error("c_read_pubkey: BN_bin2bn failed");
166 /* currently the java applet just stores 'n' */
167 if (!BN_set_word(k->rsa->e, 35)) {
168 error("c_read_pubkey: BN_set_word(e, 35) failed");
172 p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
173 debug("fingerprint %d %s", key_size(k), p);
179 /* private key operations */
182 sc_private_decrypt(int flen, u_char *from, u_char *to, RSA *rsa, int padding)
184 u_char *padded = NULL;
187 debug("sc_private_decrypt called");
193 if (padding != RSA_PKCS1_PADDING)
196 len = BN_num_bytes(rsa->n);
197 padded = xmalloc(len);
199 sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, 0, NULL, &sw);
200 if (!sectok_swOK(sw)) {
201 error("sc_private_decrypt: INS_DECRYPT failed: %s",
206 sectok_apdu(sc_fd, CLA_SSH, INS_GET_RESPONSE, 0, 0, 0, NULL,
208 if (!sectok_swOK(sw)) {
209 error("sc_private_decrypt: INS_GET_RESPONSE failed: %s",
214 olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1,
223 sc_private_encrypt(int flen, u_char *from, u_char *to, RSA *rsa, int padding)
225 u_char *padded = NULL;
232 if (padding != RSA_PKCS1_PADDING)
235 debug("sc_private_encrypt called");
236 len = BN_num_bytes(rsa->n);
237 padded = xmalloc(len);
239 if (RSA_padding_add_PKCS1_type_1(padded, len, from, flen) <= 0) {
240 error("RSA_padding_add_PKCS1_type_1 failed");
243 sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, 0, NULL, &sw);
244 if (!sectok_swOK(sw)) {
245 error("sc_private_decrypt: INS_DECRYPT failed: %s",
250 sectok_apdu(sc_fd, CLA_SSH, INS_GET_RESPONSE, 0, 0, 0, NULL,
252 if (!sectok_swOK(sw)) {
253 error("sc_private_decrypt: INS_GET_RESPONSE failed: %s",
264 /* engine for overloading private key operations */
266 static ENGINE *smart_engine = NULL;
267 static RSA_METHOD smart_rsa =
287 def = RSA_get_default_openssl_method();
290 smart_rsa.rsa_priv_enc = sc_private_encrypt;
291 smart_rsa.rsa_priv_dec = sc_private_decrypt;
293 /* just use the OpenSSL version */
294 smart_rsa.rsa_pub_enc = def->rsa_pub_enc;
295 smart_rsa.rsa_pub_dec = def->rsa_pub_dec;
296 smart_rsa.rsa_mod_exp = def->rsa_mod_exp;
297 smart_rsa.bn_mod_exp = def->bn_mod_exp;
298 smart_rsa.init = def->init;
299 smart_rsa.finish = def->finish;
300 smart_rsa.flags = def->flags;
301 smart_rsa.app_data = def->app_data;
302 smart_rsa.rsa_sign = def->rsa_sign;
303 smart_rsa.rsa_verify = def->rsa_verify;
305 smart_engine = ENGINE_new();
307 ENGINE_set_id(smart_engine, "sectok");
308 ENGINE_set_name(smart_engine, "libsectok");
309 ENGINE_set_RSA(smart_engine, &smart_rsa);
310 ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method());
311 ENGINE_set_DH(smart_engine, DH_get_default_openssl_method());
312 ENGINE_set_RAND(smart_engine, RAND_SSLeay());
313 ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp);
333 k = key_new(KEY_RSA);
337 if (sc_read_pubkey(k) < 0) {
338 error("sc_read_pubkey failed");