gmac.c

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    1 /*-
    2  * Copyright (c) 2014 The FreeBSD Foundation
    3  *
    4  * This software was developed by John-Mark Gurney under
    5  * the sponsorship of the FreeBSD Foundation and
    6  * Rubicon Communications, LLC (Netgate).
    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  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  *      $FreeBSD$
   29  *
   30  */
   31 
   32 #include <sys/types.h>
   33 #include <sys/systm.h>
   34 #include <opencrypto/gfmult.h>
   35 #include <opencrypto/gmac.h>
   36 
   37 void
   38 AES_GMAC_Init(void *ctx)
   39 {
   40         struct aes_gmac_ctx *agc;
   41 
   42         agc = ctx;
   43         bzero(agc, sizeof *agc);
   44 }
   45 
   46 void
   47 AES_GMAC_Setkey(void *ctx, const uint8_t *key, u_int klen)
   48 {
   49         struct aes_gmac_ctx *agc;
   50         const uint8_t zeros[GMAC_BLOCK_LEN] = {};
   51         struct gf128 h;
   52         uint8_t hbuf[GMAC_BLOCK_LEN];
   53 
   54         agc = ctx;
   55         agc->rounds = rijndaelKeySetupEnc(agc->keysched, key, klen * 8);
   56 
   57         rijndaelEncrypt(agc->keysched, agc->rounds, zeros, hbuf);
   58 
   59         h = gf128_read(hbuf);
   60         gf128_genmultable4(h, &agc->ghashtbl);
   61 
   62         explicit_bzero(&h, sizeof h);
   63         explicit_bzero(hbuf, sizeof hbuf);
   64 }
   65 
   66 void
   67 AES_GMAC_Reinit(void *ctx, const uint8_t *iv, u_int ivlen)
   68 {
   69         struct aes_gmac_ctx *agc;
   70 
   71         agc = ctx;
   72         KASSERT(ivlen <= sizeof agc->counter, ("passed ivlen too large!"));
   73         memset(agc->counter, 0, sizeof(agc->counter));
   74         bcopy(iv, agc->counter, ivlen);
   75         agc->counter[GMAC_BLOCK_LEN - 1] = 1;
   76 
   77         memset(&agc->hash, 0, sizeof(agc->hash));
   78 }
   79 
   80 int
   81 AES_GMAC_Update(void *ctx, const void *vdata, u_int len)
   82 {
   83         struct aes_gmac_ctx *agc;
   84         const uint8_t *data;
   85         struct gf128 v;
   86         uint8_t buf[GMAC_BLOCK_LEN] = {};
   87         int i;
   88 
   89         agc = ctx;
   90         data = vdata;
   91         v = agc->hash;
   92 
   93         while (len > 0) {
   94                 if (len >= 4*GMAC_BLOCK_LEN) {
   95                         i = 4*GMAC_BLOCK_LEN;
   96                         v = gf128_mul4b(v, data, &agc->ghashtbl);
   97                 } else if (len >= GMAC_BLOCK_LEN) {
   98                         i = GMAC_BLOCK_LEN;
   99                         v = gf128_add(v, gf128_read(data));
  100                         v = gf128_mul(v, &agc->ghashtbl.tbls[0]);
  101                 } else {
  102                         i = len;
  103                         bcopy(data, buf, i);
  104                         v = gf128_add(v, gf128_read(&buf[0]));
  105                         v = gf128_mul(v, &agc->ghashtbl.tbls[0]);
  106                         explicit_bzero(buf, sizeof buf);
  107                 }
  108                 len -= i;
  109                 data += i;
  110         }
  111 
  112         agc->hash = v;
  113         explicit_bzero(&v, sizeof v);
  114 
  115         return (0);
  116 }
  117 
  118 void
  119 AES_GMAC_Final(uint8_t *digest, void *ctx)
  120 {
  121         struct aes_gmac_ctx *agc;
  122         uint8_t enccntr[GMAC_BLOCK_LEN];
  123         struct gf128 a;
  124 
  125         agc = ctx;
  126 
  127         rijndaelEncrypt(agc->keysched, agc->rounds, agc->counter, enccntr);
  128         a = gf128_add(agc->hash, gf128_read(enccntr));
  129         gf128_write(a, digest);
  130 
  131         explicit_bzero(enccntr, sizeof enccntr);
  132 }

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FreeBSD/Linux Kernel Cross Reference sys/opencrypto/gmac.c

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sys/opencrypto/gmac.c