463 lines
10 KiB
C
463 lines
10 KiB
C
/*
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* Copyright (c) 2002 Juha Yrjölä. All rights reserved.
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* Copyright (c) 2001 Markus Friedl.
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*
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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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* are met:
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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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*
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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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*/
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#include "includes.h"
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#if defined(SMARTCARD) && defined(USE_OPENSC)
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#include <openssl/evp.h>
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#include <openssl/x509.h>
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#include <opensc/opensc.h>
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#include <opensc/pkcs15.h>
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#include "key.h"
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#include "log.h"
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#include "xmalloc.h"
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#include "readpass.h"
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#include "scard.h"
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#if OPENSSL_VERSION_NUMBER < 0x00907000L && defined(CRYPTO_LOCK_ENGINE)
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#define USE_ENGINE
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#define RSA_get_default_method RSA_get_default_openssl_method
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#else
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#endif
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#ifdef USE_ENGINE
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#include <openssl/engine.h>
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#define sc_get_rsa sc_get_engine
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#else
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#define sc_get_rsa sc_get_rsa_method
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#endif
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static int sc_reader_id;
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static sc_context_t *ctx = NULL;
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static sc_card_t *card = NULL;
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static sc_pkcs15_card_t *p15card = NULL;
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static char *sc_pin = NULL;
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struct sc_priv_data
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{
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struct sc_pkcs15_id cert_id;
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int ref_count;
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};
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void
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sc_close(void)
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{
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if (p15card) {
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sc_pkcs15_unbind(p15card);
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p15card = NULL;
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}
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if (card) {
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sc_disconnect_card(card, 0);
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card = NULL;
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}
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if (ctx) {
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sc_release_context(ctx);
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ctx = NULL;
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}
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}
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static int
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sc_init(void)
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{
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int r;
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r = sc_establish_context(&ctx, "openssh");
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if (r)
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goto err;
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r = sc_connect_card(ctx->reader[sc_reader_id], 0, &card);
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if (r)
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goto err;
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r = sc_pkcs15_bind(card, &p15card);
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if (r)
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goto err;
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return 0;
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err:
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sc_close();
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return r;
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}
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/* private key operations */
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static int
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sc_prkey_op_init(RSA *rsa, struct sc_pkcs15_object **key_obj_out)
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{
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int r;
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struct sc_priv_data *priv;
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struct sc_pkcs15_object *key_obj;
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struct sc_pkcs15_prkey_info *key;
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struct sc_pkcs15_object *pin_obj;
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struct sc_pkcs15_pin_info *pin;
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priv = (struct sc_priv_data *) RSA_get_app_data(rsa);
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if (priv == NULL)
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return -1;
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if (p15card == NULL) {
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sc_close();
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r = sc_init();
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if (r) {
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error("SmartCard init failed: %s", sc_strerror(r));
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goto err;
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}
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}
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r = sc_pkcs15_find_prkey_by_id(p15card, &priv->cert_id, &key_obj);
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if (r) {
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error("Unable to find private key from SmartCard: %s",
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sc_strerror(r));
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goto err;
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}
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key = key_obj->data;
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r = sc_pkcs15_find_pin_by_auth_id(p15card, &key_obj->auth_id,
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&pin_obj);
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if (r) {
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error("Unable to find PIN object from SmartCard: %s",
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sc_strerror(r));
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goto err;
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}
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pin = pin_obj->data;
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r = sc_lock(card);
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if (r) {
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error("Unable to lock smartcard: %s", sc_strerror(r));
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goto err;
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}
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if (sc_pin != NULL) {
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r = sc_pkcs15_verify_pin(p15card, pin, sc_pin,
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strlen(sc_pin));
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if (r) {
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sc_unlock(card);
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error("PIN code verification failed: %s",
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sc_strerror(r));
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goto err;
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}
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}
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*key_obj_out = key_obj;
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return 0;
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err:
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sc_close();
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return -1;
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}
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static int
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sc_private_decrypt(int flen, u_char *from, u_char *to, RSA *rsa,
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int padding)
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{
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struct sc_pkcs15_object *key_obj;
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int r;
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if (padding != RSA_PKCS1_PADDING)
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return -1;
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r = sc_prkey_op_init(rsa, &key_obj);
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if (r)
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return -1;
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r = sc_pkcs15_decipher(p15card, key_obj, 0, from, flen, to, flen);
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sc_unlock(card);
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if (r < 0) {
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error("sc_pkcs15_decipher() failed: %s", sc_strerror(r));
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goto err;
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}
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return r;
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err:
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sc_close();
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return -1;
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}
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static int
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sc_sign(int type, u_char *m, unsigned int m_len,
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unsigned char *sigret, unsigned int *siglen, RSA *rsa)
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{
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struct sc_pkcs15_object *key_obj;
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int r;
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unsigned long flags = 0;
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r = sc_prkey_op_init(rsa, &key_obj);
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if (r)
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return -1;
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/* FIXME: length of sigret correct? */
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/* FIXME: check 'type' and modify flags accordingly */
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flags = SC_ALGORITHM_RSA_PAD_PKCS1 | SC_ALGORITHM_RSA_HASH_SHA1;
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r = sc_pkcs15_compute_signature(p15card, key_obj, flags,
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m, m_len, sigret, RSA_size(rsa));
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sc_unlock(card);
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if (r < 0) {
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error("sc_pkcs15_compute_signature() failed: %s",
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sc_strerror(r));
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goto err;
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}
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*siglen = r;
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return 1;
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err:
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sc_close();
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return 0;
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}
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static int
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sc_private_encrypt(int flen, u_char *from, u_char *to, RSA *rsa,
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int padding)
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{
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error("Private key encryption not supported");
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return -1;
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}
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/* called on free */
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static int (*orig_finish)(RSA *rsa) = NULL;
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static int
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sc_finish(RSA *rsa)
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{
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struct sc_priv_data *priv;
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priv = RSA_get_app_data(rsa);
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priv->ref_count--;
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if (priv->ref_count == 0) {
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free(priv);
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sc_close();
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}
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if (orig_finish)
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orig_finish(rsa);
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return 1;
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}
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/* engine for overloading private key operations */
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static RSA_METHOD *
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sc_get_rsa_method(void)
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{
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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 = "opensc";
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/* overload */
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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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smart_rsa.rsa_sign = sc_sign;
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/* save original */
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orig_finish = def->finish;
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smart_rsa.finish = sc_finish;
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return &smart_rsa;
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}
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#ifdef USE_ENGINE
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static ENGINE *
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sc_get_engine(void)
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{
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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, "opensc");
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ENGINE_set_name(smart_engine, "OpenSC");
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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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return smart_engine;
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}
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#endif
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static void
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convert_rsa_to_rsa1(Key * in, Key * out)
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{
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struct sc_priv_data *priv;
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out->rsa->flags = in->rsa->flags;
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out->flags = in->flags;
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RSA_set_method(out->rsa, RSA_get_method(in->rsa));
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BN_copy(out->rsa->n, in->rsa->n);
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BN_copy(out->rsa->e, in->rsa->e);
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priv = RSA_get_app_data(in->rsa);
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priv->ref_count++;
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RSA_set_app_data(out->rsa, priv);
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return;
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}
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static int
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sc_read_pubkey(Key * k, const struct sc_pkcs15_object *cert_obj)
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{
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int r;
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sc_pkcs15_cert_t *cert = NULL;
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struct sc_priv_data *priv = NULL;
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sc_pkcs15_cert_info_t *cinfo = cert_obj->data;
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X509 *x509 = NULL;
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EVP_PKEY *pubkey = NULL;
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u8 *p;
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char *tmp;
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debug("sc_read_pubkey() with cert id %02X", cinfo->id.value[0]);
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r = sc_pkcs15_read_certificate(p15card, cinfo, &cert);
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if (r) {
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log("Certificate read failed: %s", sc_strerror(r));
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goto err;
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}
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x509 = X509_new();
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if (x509 == NULL) {
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r = -1;
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goto err;
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}
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p = cert->data;
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if (!d2i_X509(&x509, &p, cert->data_len)) {
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log("Unable to parse X.509 certificate");
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r = -1;
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goto err;
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}
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sc_pkcs15_free_certificate(cert);
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cert = NULL;
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pubkey = X509_get_pubkey(x509);
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X509_free(x509);
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x509 = NULL;
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if (pubkey->type != EVP_PKEY_RSA) {
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log("Public key is of unknown type");
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r = -1;
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goto err;
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}
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k->rsa = EVP_PKEY_get1_RSA(pubkey);
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EVP_PKEY_free(pubkey);
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k->rsa->flags |= RSA_FLAG_SIGN_VER;
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RSA_set_method(k->rsa, sc_get_rsa_method());
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priv = xmalloc(sizeof(struct sc_priv_data));
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priv->cert_id = cinfo->id;
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priv->ref_count = 1;
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RSA_set_app_data(k->rsa, priv);
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k->flags = KEY_FLAG_EXT;
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tmp = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
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debug("fingerprint %d %s", key_size(k), tmp);
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xfree(tmp);
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return 0;
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err:
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if (cert)
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sc_pkcs15_free_certificate(cert);
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if (pubkey)
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EVP_PKEY_free(pubkey);
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if (x509)
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X509_free(x509);
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return r;
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}
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Key **
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sc_get_keys(const char *id, const char *pin)
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{
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Key *k, **keys;
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int i, r, real_count = 0, key_count;
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sc_pkcs15_id_t cert_id;
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sc_pkcs15_object_t *certs[32];
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char *buf = xstrdup(id), *p;
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debug("sc_get_keys called: id = %s", id);
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if (sc_pin != NULL)
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xfree(sc_pin);
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sc_pin = (pin == NULL) ? NULL : xstrdup(pin);
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cert_id.len = 0;
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if ((p = strchr(buf, ':')) != NULL) {
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*p = 0;
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p++;
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sc_pkcs15_hex_string_to_id(p, &cert_id);
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}
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r = sscanf(buf, "%d", &sc_reader_id);
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xfree(buf);
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if (r != 1)
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goto err;
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if (p15card == NULL) {
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sc_close();
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r = sc_init();
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if (r) {
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error("Smartcard init failed: %s", sc_strerror(r));
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goto err;
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}
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}
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if (cert_id.len) {
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r = sc_pkcs15_find_cert_by_id(p15card, &cert_id, &certs[0]);
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if (r < 0)
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goto err;
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key_count = 1;
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} else {
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r = sc_pkcs15_get_objects(p15card, SC_PKCS15_TYPE_CERT_X509,
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certs, 32);
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if (r == 0) {
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log("No certificates found on smartcard");
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r = -1;
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goto err;
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} else if (r < 0) {
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error("Certificate enumeration failed: %s",
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sc_strerror(r));
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goto err;
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}
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key_count = r;
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}
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/* FIXME: only keep entries with a corresponding private key */
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keys = xmalloc(sizeof(Key *) * (key_count*2+1));
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for (i = 0; i < key_count; i++) {
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k = key_new(KEY_RSA);
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if (k == NULL)
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break;
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r = sc_read_pubkey(k, certs[i]);
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if (r) {
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error("sc_read_pubkey failed: %s", sc_strerror(r));
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key_free(k);
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continue;
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}
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keys[real_count] = k;
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real_count++;
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k = key_new(KEY_RSA1);
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if (k == NULL)
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break;
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convert_rsa_to_rsa1(keys[real_count-1], k);
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keys[real_count] = k;
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real_count++;
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}
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keys[real_count] = NULL;
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return keys;
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err:
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sc_close();
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return NULL;
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}
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int
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sc_put_key(Key *prv, const char *id)
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{
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error("key uploading not yet supported");
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return -1;
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}
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#endif /* SMARTCARD */
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