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* Copyright (c) 2001 Markus Friedl. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#if defined(SMARTCARD) && defined(USE_SECTOK)
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RCSID("$OpenBSD: scard.c,v 1.28 2003/06/12 19:12:02 markus Exp $");
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#include <openssl/evp.h>
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#if OPENSSL_VERSION_NUMBER < 0x00907000L
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#define RSA_get_default_method RSA_get_default_openssl_method
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#include <openssl/engine.h>
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#define sc_get_rsa sc_get_engine
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#define sc_get_rsa sc_get_rsa_method
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#define INS_DECRYPT 0x10
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#define INS_GET_KEYLENGTH 0x20
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#define INS_GET_PUBKEY 0x30
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#define INS_GET_RESPONSE 0xc0
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#define MAX_BUF_SIZE 256
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u_char DEFAUT0[] = {0xad, 0x9f, 0x61, 0xfe, 0xfa, 0x20, 0xce, 0x63};
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static int sc_fd = -1;
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static char *sc_reader_id = NULL;
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static char *sc_pin = NULL;
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static int cla = 0x00; /* class */
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static void sc_mk_digest(const char *pin, u_char *digest);
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static int get_AUT0(u_char *aut0);
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static int try_AUT0(void);
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/* interface to libsectok */
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sc_fd = sectok_friendly_open(sc_reader_id, STONOWAIT, &sw);
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error("sectok_open failed: %s", sectok_get_sw(sw));
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return SCARD_ERROR_FAIL;
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if (! sectok_cardpresent(sc_fd)) {
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debug("smartcard in reader %s not present, skipping",
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return SCARD_ERROR_NOCARD;
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if (sectok_reset(sc_fd, 0, NULL, &sw) <= 0) {
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error("sectok_reset failed: %s", sectok_get_sw(sw));
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return SCARD_ERROR_FAIL;
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if ((cla = cyberflex_inq_class(sc_fd)) < 0)
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debug("sc_open ok %d", sc_fd);
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sc_enable_applet(void)
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static u_char aid[] = {0xfc, 0x53, 0x73, 0x68, 0x2e, 0x62, 0x69, 0x6e};
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/* select applet id */
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sectok_apdu(sc_fd, cla, 0xa4, 0x04, 0, sizeof aid, aid, 0, NULL, &sw);
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if (!sectok_swOK(sw)) {
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error("sectok_apdu failed: %s", sectok_get_sw(sw));
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if (status == SCARD_ERROR_NOCARD) {
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return SCARD_ERROR_NOCARD;
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error("sc_open failed");
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if (sc_enable_applet() < 0) {
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error("sc_enable_applet failed");
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return SCARD_ERROR_APPLET;
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sc_read_pubkey(Key * k)
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int len, sw, status = -1;
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sectok_apdu(sc_fd, CLA_SSH, INS_GET_KEYLENGTH, 0, 0, 0, NULL,
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sizeof(buf), buf, &sw);
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if (!sectok_swOK(sw)) {
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error("could not obtain key length: %s", sectok_get_sw(sw));
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len = (buf[0] << 8) | buf[1];
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debug("INS_GET_KEYLENGTH: len %d sw %s", len, sectok_get_sw(sw));
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sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
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sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
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if (!sectok_swOK(sw)) {
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error("could not obtain public key: %s", sectok_get_sw(sw));
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debug("INS_GET_KEYLENGTH: sw %s", sectok_get_sw(sw));
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if (BN_bin2bn(n, len, k->rsa->n) == NULL) {
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error("c_read_pubkey: BN_bin2bn failed");
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/* currently the java applet just stores 'n' */
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if (!BN_set_word(k->rsa->e, 35)) {
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error("c_read_pubkey: BN_set_word(e, 35) failed");
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p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
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debug("fingerprint %u %s", key_size(k), p);
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/* private key operations */
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sc_private_decrypt(int flen, u_char *from, u_char *to, RSA *rsa,
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u_char *padded = NULL;
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int sw, len, olen, status = -1;
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debug("sc_private_decrypt called");
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if (padding != RSA_PKCS1_PADDING)
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len = BN_num_bytes(rsa->n);
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padded = xmalloc(len);
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sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
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sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
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if (!sectok_swOK(sw)) {
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error("sc_private_decrypt: INS_DECRYPT failed: %s",
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olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1,
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return (olen >= 0 ? olen : status);
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sc_private_encrypt(int flen, u_char *from, u_char *to, RSA *rsa,
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u_char *padded = NULL;
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int sw, len, status = -1;
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if (padding != RSA_PKCS1_PADDING)
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debug("sc_private_encrypt called");
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len = BN_num_bytes(rsa->n);
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padded = xmalloc(len);
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if (RSA_padding_add_PKCS1_type_1(padded, len, (u_char *)from, flen) <= 0) {
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error("RSA_padding_add_PKCS1_type_1 failed");
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sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
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sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
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if (!sectok_swOK(sw)) {
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error("sc_private_encrypt: INS_DECRYPT failed: %s",
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return (len >= 0 ? len : status);
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static int (*orig_finish)(RSA *rsa) = NULL;
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/* engine for overloading private key operations */
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sc_get_rsa_method(void)
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static RSA_METHOD smart_rsa;
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const RSA_METHOD *def = RSA_get_default_method();
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/* use the OpenSSL version */
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memcpy(&smart_rsa, def, sizeof(smart_rsa));
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smart_rsa.name = "sectok";
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smart_rsa.rsa_priv_enc = sc_private_encrypt;
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smart_rsa.rsa_priv_dec = sc_private_decrypt;
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orig_finish = def->finish;
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smart_rsa.finish = sc_finish;
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static ENGINE *smart_engine = NULL;
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if ((smart_engine = ENGINE_new()) == NULL)
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fatal("ENGINE_new failed");
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ENGINE_set_id(smart_engine, "sectok");
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ENGINE_set_name(smart_engine, "libsectok");
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ENGINE_set_RSA(smart_engine, sc_get_rsa_method());
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ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method());
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ENGINE_set_DH(smart_engine, DH_get_default_openssl_method());
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ENGINE_set_RAND(smart_engine, RAND_SSLeay());
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ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp);
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sc_get_keys(const char *id, const char *pin)
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int status, nkeys = 2;
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if (sc_reader_id != NULL)
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sc_reader_id = xstrdup(id);
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sc_pin = (pin == NULL) ? NULL : xstrdup(pin);
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k = key_new(KEY_RSA);
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status = sc_read_pubkey(k);
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if (status == SCARD_ERROR_NOCARD) {
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error("sc_read_pubkey failed");
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keys = xmalloc((nkeys+1) * sizeof(Key *));
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n = key_new(KEY_RSA1);
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BN_copy(n->rsa->n, k->rsa->n);
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BN_copy(n->rsa->e, k->rsa->e);
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RSA_set_method(n->rsa, sc_get_rsa());
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n->flags |= KEY_FLAG_EXT;
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n = key_new(KEY_RSA);
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BN_copy(n->rsa->n, k->rsa->n);
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BN_copy(n->rsa->e, k->rsa->e);
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RSA_set_method(n->rsa, sc_get_rsa());
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n->flags |= KEY_FLAG_EXT;
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#define NUM_RSA_KEY_ELEMENTS 5+1
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#define COPY_RSA_KEY(x, i) \
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len = BN_num_bytes(prv->rsa->x); \
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elements[i] = xmalloc(len); \
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debug("#bytes %d", len); \
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if (BN_bn2bin(prv->rsa->x, elements[i]) < 0) \
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sc_mk_digest(const char *pin, u_char *digest)
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const EVP_MD *evp_md = EVP_sha1();
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EVP_DigestInit(&md, evp_md);
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EVP_DigestUpdate(&md, pin, strlen(pin));
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EVP_DigestFinal(&md, digest, NULL);
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get_AUT0(u_char *aut0)
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pass = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN);
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if (!strcmp(pass, "-")) {
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memcpy(aut0, DEFAUT0, sizeof DEFAUT0);
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sc_mk_digest(pass, aut0);
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memset(pass, 0, strlen(pass));
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u_char aut0[EVP_MAX_MD_SIZE];
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/* permission denied; try PIN if provided */
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if (sc_pin && strlen(sc_pin) > 0) {
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sc_mk_digest(sc_pin, aut0);
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if (cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
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error("smartcard passphrase incorrect");
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/* try default AUT0 key */
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if (cyberflex_verify_AUT0(sc_fd, cla, DEFAUT0, 8) < 0) {
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/* default AUT0 key failed; prompt for passphrase */
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if (get_AUT0(aut0) < 0 ||
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cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
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error("smartcard passphrase incorrect");
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sc_put_key(Key *prv, const char *id)
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u_char *elements[NUM_RSA_KEY_ELEMENTS];
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u_char AUT0[EVP_MAX_MD_SIZE];
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int len, status = -1, i, fd = -1, ret;
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int sw = 0, cla = 0x00;
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for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
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COPY_RSA_KEY(iqmp, 2);
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COPY_RSA_KEY(dmq1, 3);
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COPY_RSA_KEY(dmp1, 4);
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len = BN_num_bytes(prv->rsa->n);
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fd = sectok_friendly_open(id, STONOWAIT, &sw);
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error("sectok_open failed: %s", sectok_get_sw(sw));
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if (! sectok_cardpresent(fd)) {
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error("smartcard in reader %s not present", id);
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ret = sectok_reset(fd, 0, NULL, &sw);
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error("sectok_reset failed: %s", sectok_get_sw(sw));
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if ((cla = cyberflex_inq_class(fd)) < 0) {
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error("cyberflex_inq_class failed");
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memcpy(AUT0, DEFAUT0, sizeof(DEFAUT0));
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if (cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
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if (get_AUT0(AUT0) < 0 ||
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cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
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memset(AUT0, 0, sizeof(DEFAUT0));
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error("smartcard passphrase incorrect");
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memset(AUT0, 0, sizeof(DEFAUT0));
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if (cyberflex_load_rsa_priv(fd, cla, key_fid, 5, 8*len, elements,
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error("cyberflex_load_rsa_priv failed: %s", sectok_get_sw(sw));
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if (!sectok_swOK(sw))
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logit("cyberflex_load_rsa_priv done");
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if (cyberflex_load_rsa_pub(fd, cla, key_fid, len, elements[5],
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error("cyberflex_load_rsa_pub failed: %s", sectok_get_sw(sw));
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if (!sectok_swOK(sw))
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logit("cyberflex_load_rsa_pub done");
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memset(elements[0], '\0', BN_num_bytes(prv->rsa->q));
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memset(elements[1], '\0', BN_num_bytes(prv->rsa->p));
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memset(elements[2], '\0', BN_num_bytes(prv->rsa->iqmp));
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memset(elements[3], '\0', BN_num_bytes(prv->rsa->dmq1));
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memset(elements[4], '\0', BN_num_bytes(prv->rsa->dmp1));
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memset(elements[5], '\0', BN_num_bytes(prv->rsa->n));
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for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
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sc_get_key_label(Key *key)
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return xstrdup("smartcard key");
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#endif /* SMARTCARD && USE_SECTOK */