131 lines
2.6 KiB
C
131 lines
2.6 KiB
C
/*
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*
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* Wireless daemon for Linux
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*
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* Copyright (C) 2013-2014 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#define _GNU_SOURCE
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/socket.h>
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#ifndef PF_ALG
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#include <linux/types.h>
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struct sockaddr_alg {
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__u16 salg_family;
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__u8 salg_type[14];
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__u32 salg_feat;
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__u32 salg_mask;
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__u8 salg_name[64];
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};
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#define ALG_SET_KEY 1
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#define PF_ALG 38 /* Algorithm sockets. */
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#define AF_ALG PF_ALG
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#else
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#include <linux/if_alg.h>
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#endif
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#ifndef SOL_ALG
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#define SOL_ALG 279
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#endif
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#include "src/aes.h"
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/* Maximum message length that can be passed to aes_cmac */
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#define CMAC_MSG_MAX 80
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static int cmac_aes_setup(void)
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{
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struct sockaddr_alg salg;
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int fd;
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fd = socket(PF_ALG, SOCK_SEQPACKET | SOCK_CLOEXEC, 0);
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if (fd < 0)
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return -1;
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memset(&salg, 0, sizeof(salg));
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salg.salg_family = AF_ALG;
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strcpy((char *) salg.salg_type, "hash");
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strcpy((char *) salg.salg_name, "cmac(aes)");
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if (bind(fd, (struct sockaddr *) &salg, sizeof(salg)) < 0) {
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close(fd);
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return -1;
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}
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return fd;
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}
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static int alg_new(int fd, const void *keyval, socklen_t keylen)
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{
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if (setsockopt(fd, SOL_ALG, ALG_SET_KEY, keyval, keylen) < 0)
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return -1;
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return accept4(fd, NULL, 0, SOCK_CLOEXEC);
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}
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bool cmac_aes(const void *key, size_t key_len,
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const void *msg, size_t msg_len, void *tag, size_t size)
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{
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ssize_t len;
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int fd, alg_fd;
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bool result;
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if (msg_len > CMAC_MSG_MAX)
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return false;
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alg_fd = cmac_aes_setup();
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if (alg_fd < 0)
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return false;
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fd = alg_new(alg_fd, key, key_len);
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if (fd < 0) {
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close(alg_fd);
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return false;
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}
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len = send(fd, msg, msg_len, 0);
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if (len < 0) {
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result = false;
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goto done;
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}
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len = read(fd, tag, size);
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if (len < 0) {
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result = false;
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goto done;
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}
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result = true;
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done:
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close(fd);
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close(alg_fd);
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return result;
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}
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