ah_aesxcbcmac.c

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    1 /*      $KAME: ah_aesxcbcmac.c,v 1.6 2003/07/22 02:30:54 itojun Exp $   */
    2 
    3 /*
    4  * Copyright (C) 1995, 1996, 1997, 1998 and 2003 WIDE Project.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the project nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  * $FreeBSD: releng/5.2/sys/netinet6/ah_aesxcbcmac.c 121062 2003-10-13 04:56:04Z ume $
   32  */
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/socket.h>
   37 #include <sys/queue.h>
   38 #include <sys/malloc.h>
   39 #include <sys/syslog.h>
   40 #include <sys/mbuf.h>
   41 
   42 #include <net/if.h>
   43 #include <net/route.h>
   44 
   45 #include <netinet/in.h>
   46 
   47 #include <netinet6/ipsec.h>
   48 #include <netinet6/ah.h>
   49 #include <netinet6/ah_aesxcbcmac.h>
   50 
   51 #include <netkey/key.h>
   52 
   53 #include <crypto/rijndael/rijndael.h>
   54 
   55 #include <net/net_osdep.h>
   56 
   57 #define AES_BLOCKSIZE   16
   58 
   59 typedef struct {
   60         u_int8_t        e[AES_BLOCKSIZE];
   61         u_int8_t        buf[AES_BLOCKSIZE];
   62         size_t          buflen;
   63         u_int32_t       r_k1s[(RIJNDAEL_MAXNR+1)*4];
   64         u_int32_t       r_k2s[(RIJNDAEL_MAXNR+1)*4];
   65         u_int32_t       r_k3s[(RIJNDAEL_MAXNR+1)*4];
   66         int             r_nr; /* key-length-dependent number of rounds */
   67         u_int8_t        k2[AES_BLOCKSIZE];
   68         u_int8_t        k3[AES_BLOCKSIZE];
   69 } aesxcbc_ctx;
   70 
   71 int
   72 ah_aes_xcbc_mac_init(state, sav)
   73         struct ah_algorithm_state *state;
   74         struct secasvar *sav;
   75 {
   76         u_int8_t k1seed[AES_BLOCKSIZE] = { 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 };
   77         u_int8_t k2seed[AES_BLOCKSIZE] = { 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2 };
   78         u_int8_t k3seed[AES_BLOCKSIZE] = { 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3 };
   79         u_int32_t r_ks[(RIJNDAEL_MAXNR+1)*4];
   80         aesxcbc_ctx *ctx;
   81 
   82         if (!state)
   83                 panic("ah_aes_xcbc_mac_init: what?");
   84 
   85         state->sav = sav;
   86         state->foo = (void *)malloc(sizeof(aesxcbc_ctx), M_TEMP, M_NOWAIT);
   87         if (!state->foo)
   88                 return ENOBUFS;
   89         bzero(state->foo, sizeof(aesxcbc_ctx));
   90 
   91         ctx = (aesxcbc_ctx *)state->foo;
   92 
   93         if ((ctx->r_nr = rijndaelKeySetupEnc(r_ks,
   94             (char *)_KEYBUF(sav->key_auth), AES_BLOCKSIZE * 8)) == 0)
   95                 return -1;
   96         if (rijndaelKeySetupEnc(ctx->r_k1s, k1seed, AES_BLOCKSIZE * 8) == 0)
   97                 return -1;
   98         if (rijndaelKeySetupEnc(ctx->r_k2s, k2seed, AES_BLOCKSIZE * 8) == 0)
   99                 return -1;
  100         if (rijndaelKeySetupEnc(ctx->r_k3s, k3seed, AES_BLOCKSIZE * 8) == 0)
  101                 return -1;
  102         rijndaelEncrypt(r_ks, ctx->r_nr, k2seed, ctx->k2);
  103         rijndaelEncrypt(r_ks, ctx->r_nr, k3seed, ctx->k3);
  104 
  105         return 0;
  106 }
  107 
  108 void
  109 ah_aes_xcbc_mac_loop(state, addr, len)
  110         struct ah_algorithm_state *state;
  111         u_int8_t *addr;
  112         size_t len;
  113 {
  114         u_int8_t buf[AES_BLOCKSIZE];
  115         aesxcbc_ctx *ctx;
  116         u_int8_t *ep;
  117         int i;
  118 
  119         if (!state || !state->foo)
  120                 panic("ah_aes_xcbc_mac_loop: what?");
  121 
  122         ctx = (aesxcbc_ctx *)state->foo;
  123         ep = addr + len;
  124 
  125         if (ctx->buflen == sizeof(ctx->buf)) {
  126                 for (i = 0; i < sizeof(ctx->e); i++)
  127                         ctx->buf[i] ^= ctx->e[i];
  128                 rijndaelEncrypt(ctx->r_k1s, ctx->r_nr, ctx->buf, ctx->e);
  129                 ctx->buflen = 0;
  130         }
  131         if (ctx->buflen + len < sizeof(ctx->buf)) {
  132                 bcopy(addr, ctx->buf + ctx->buflen, len);
  133                 ctx->buflen += len;
  134                 return;
  135         }
  136         if (ctx->buflen && ctx->buflen + len > sizeof(ctx->buf)) {
  137                 bcopy(addr, ctx->buf + ctx->buflen,
  138                     sizeof(ctx->buf) - ctx->buflen);
  139                 for (i = 0; i < sizeof(ctx->e); i++)
  140                         ctx->buf[i] ^= ctx->e[i];
  141                 rijndaelEncrypt(ctx->r_k1s, ctx->r_nr, ctx->buf, ctx->e);
  142                 addr += sizeof(ctx->buf) - ctx->buflen;
  143                 ctx->buflen = 0;
  144         }
  145         /* due to the special processing for M[n], "=" case is not included */
  146         while (addr + AES_BLOCKSIZE < ep) {
  147                 bcopy(addr, buf, AES_BLOCKSIZE);
  148                 for (i = 0; i < sizeof(buf); i++)
  149                         buf[i] ^= ctx->e[i];
  150                 rijndaelEncrypt(ctx->r_k1s, ctx->r_nr, buf, ctx->e);
  151                 addr += AES_BLOCKSIZE;
  152         }
  153         if (addr < ep) {
  154                 bcopy(addr, ctx->buf, ep - addr);
  155                 ctx->buflen = ep - addr;
  156         }
  157 }
  158 
  159 void
  160 ah_aes_xcbc_mac_result(state, addr, l)
  161         struct ah_algorithm_state *state;
  162         u_int8_t *addr;
  163         size_t l;
  164 {
  165         u_char digest[AES_BLOCKSIZE];
  166         aesxcbc_ctx *ctx;
  167         int i;
  168 
  169         ctx = (aesxcbc_ctx *)state->foo;
  170 
  171         if (ctx->buflen == sizeof(ctx->buf)) {
  172                 for (i = 0; i < sizeof(ctx->buf); i++) {
  173                         ctx->buf[i] ^= ctx->e[i];
  174                         ctx->buf[i] ^= ctx->k2[i];
  175                 }
  176                 rijndaelEncrypt(ctx->r_k1s, ctx->r_nr, ctx->buf, digest);
  177         } else {
  178                 for (i = ctx->buflen; i < sizeof(ctx->buf); i++)
  179                         ctx->buf[i] = (i == ctx->buflen) ? 0x80 : 0x00;
  180                 for (i = 0; i < sizeof(ctx->buf); i++) {
  181                         ctx->buf[i] ^= ctx->e[i];
  182                         ctx->buf[i] ^= ctx->k3[i];
  183                 }
  184                 rijndaelEncrypt(ctx->r_k1s, ctx->r_nr, ctx->buf, digest);
  185         }
  186 
  187         bcopy(digest, addr, sizeof(digest) > l ? l : sizeof(digest));
  188 
  189         free(state->foo, M_TEMP);
  190 }

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FreeBSD/Linux Kernel Cross Reference sys/netinet6/ah_aesxcbcmac.c

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sys/netinet6/ah_aesxcbcmac.c