gmac.c

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    1 /*-
    2  * Copyright (c) 2014 The FreeBSD Foundation
    3  * All rights reserved.
    4  *
    5  * This software was developed by John-Mark Gurney under
    6  * the sponsorship of the FreeBSD Foundation and
    7  * Rubicon Communications, LLC (Netgate).
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1.  Redistributions of source code must retain the above copyright
   12  *     notice, this list of conditions and the following disclaimer.
   13  * 2.  Redistributions in binary form must reproduce the above copyright
   14  *     notice, this list of conditions and the following disclaimer in the
   15  *     documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $FreeBSD: releng/11.2/sys/opencrypto/gmac.c 275732 2014-12-12 19:56:36Z jmg $
   30  *
   31  */
   32 
   33 #include <sys/types.h>
   34 #include <sys/systm.h>
   35 #include <opencrypto/gfmult.h>
   36 #include <opencrypto/gmac.h>
   37 
   38 void
   39 AES_GMAC_Init(struct aes_gmac_ctx *agc)
   40 {
   41 
   42         bzero(agc, sizeof *agc);
   43 }
   44 
   45 void
   46 AES_GMAC_Setkey(struct aes_gmac_ctx *agc, const uint8_t *key, uint16_t klen)
   47 {
   48         const uint8_t zeros[GMAC_BLOCK_LEN] = {};
   49         struct gf128 h;
   50         uint8_t hbuf[GMAC_BLOCK_LEN];
   51 
   52         agc->rounds = rijndaelKeySetupEnc(agc->keysched, key, klen * 8);
   53 
   54         rijndaelEncrypt(agc->keysched, agc->rounds, zeros, hbuf);
   55 
   56         h = gf128_read(hbuf);
   57         gf128_genmultable4(h, &agc->ghashtbl);
   58 
   59         explicit_bzero(&h, sizeof h);
   60         explicit_bzero(hbuf, sizeof hbuf);
   61 }
   62 
   63 void
   64 AES_GMAC_Reinit(struct aes_gmac_ctx *agc, const uint8_t *iv, uint16_t ivlen)
   65 {
   66 
   67         KASSERT(ivlen <= sizeof agc->counter, ("passed ivlen too large!"));
   68         bcopy(iv, agc->counter, ivlen);
   69 }
   70 
   71 int
   72 AES_GMAC_Update(struct aes_gmac_ctx *agc, const uint8_t *data, uint16_t len)
   73 {
   74         struct gf128 v;
   75         uint8_t buf[GMAC_BLOCK_LEN] = {};
   76         int i;
   77 
   78         v = agc->hash;
   79 
   80         while (len > 0) {
   81                 if (len >= 4*GMAC_BLOCK_LEN) {
   82                         i = 4*GMAC_BLOCK_LEN;
   83                         v = gf128_mul4b(v, data, &agc->ghashtbl);
   84                 } else if (len >= GMAC_BLOCK_LEN) {
   85                         i = GMAC_BLOCK_LEN;
   86                         v = gf128_add(v, gf128_read(data));
   87                         v = gf128_mul(v, &agc->ghashtbl.tbls[0]);
   88                 } else {
   89                         i = len;
   90                         bcopy(data, buf, i);
   91                         v = gf128_add(v, gf128_read(&buf[0]));
   92                         v = gf128_mul(v, &agc->ghashtbl.tbls[0]);
   93                         explicit_bzero(buf, sizeof buf);
   94                 }
   95                 len -= i;
   96                 data += i;
   97         }
   98 
   99         agc->hash = v;
  100         explicit_bzero(&v, sizeof v);
  101 
  102         return (0);
  103 }
  104 
  105 void
  106 AES_GMAC_Final(uint8_t digest[GMAC_DIGEST_LEN], struct aes_gmac_ctx *agc)
  107 {
  108         uint8_t enccntr[GMAC_BLOCK_LEN];
  109         struct gf128 a;
  110 
  111         /* XXX - zero additional bytes? */
  112         agc->counter[GMAC_BLOCK_LEN - 1] = 1;
  113 
  114         rijndaelEncrypt(agc->keysched, agc->rounds, agc->counter, enccntr);
  115         a = gf128_add(agc->hash, gf128_read(enccntr));
  116         gf128_write(a, digest);
  117 
  118         explicit_bzero(enccntr, sizeof enccntr);
  119 }

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

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sys/opencrypto/gmac.c