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  *      $FreeBSD$
   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(void *ctx)
   40 {
   41         struct aes_gmac_ctx *agc;
   42 
   43         agc = ctx;
   44         bzero(agc, sizeof *agc);
   45 }
   46 
   47 void
   48 AES_GMAC_Setkey(void *ctx, const uint8_t *key, u_int klen)
   49 {
   50         struct aes_gmac_ctx *agc;
   51         const uint8_t zeros[GMAC_BLOCK_LEN] = {};
   52         struct gf128 h;
   53         uint8_t hbuf[GMAC_BLOCK_LEN];
   54 
   55         agc = ctx;
   56         agc->rounds = rijndaelKeySetupEnc(agc->keysched, key, klen * 8);
   57 
   58         rijndaelEncrypt(agc->keysched, agc->rounds, zeros, hbuf);
   59 
   60         h = gf128_read(hbuf);
   61         gf128_genmultable4(h, &agc->ghashtbl);
   62 
   63         explicit_bzero(&h, sizeof h);
   64         explicit_bzero(hbuf, sizeof hbuf);
   65 }
   66 
   67 void
   68 AES_GMAC_Reinit(void *ctx, const uint8_t *iv, u_int ivlen)
   69 {
   70         struct aes_gmac_ctx *agc;
   71 
   72         agc = ctx;
   73         KASSERT(ivlen <= sizeof agc->counter, ("passed ivlen too large!"));
   74         bcopy(iv, agc->counter, ivlen);
   75 }
   76 
   77 int
   78 AES_GMAC_Update(void *ctx, const void *vdata, u_int len)
   79 {
   80         struct aes_gmac_ctx *agc;
   81         const uint8_t *data;
   82         struct gf128 v;
   83         uint8_t buf[GMAC_BLOCK_LEN] = {};
   84         int i;
   85 
   86         agc = ctx;
   87         data = vdata;
   88         v = agc->hash;
   89 
   90         while (len > 0) {
   91                 if (len >= 4*GMAC_BLOCK_LEN) {
   92                         i = 4*GMAC_BLOCK_LEN;
   93                         v = gf128_mul4b(v, data, &agc->ghashtbl);
   94                 } else if (len >= GMAC_BLOCK_LEN) {
   95                         i = GMAC_BLOCK_LEN;
   96                         v = gf128_add(v, gf128_read(data));
   97                         v = gf128_mul(v, &agc->ghashtbl.tbls[0]);
   98                 } else {
   99                         i = len;
  100                         bcopy(data, buf, i);
  101                         v = gf128_add(v, gf128_read(&buf[0]));
  102                         v = gf128_mul(v, &agc->ghashtbl.tbls[0]);
  103                         explicit_bzero(buf, sizeof buf);
  104                 }
  105                 len -= i;
  106                 data += i;
  107         }
  108 
  109         agc->hash = v;
  110         explicit_bzero(&v, sizeof v);
  111 
  112         return (0);
  113 }
  114 
  115 void
  116 AES_GMAC_Final(uint8_t *digest, void *ctx)
  117 {
  118         struct aes_gmac_ctx *agc;
  119         uint8_t enccntr[GMAC_BLOCK_LEN];
  120         struct gf128 a;
  121 
  122         /* XXX - zero additional bytes? */
  123         agc = ctx;
  124         agc->counter[GMAC_BLOCK_LEN - 1] = 1;
  125 
  126         rijndaelEncrypt(agc->keysched, agc->rounds, agc->counter, enccntr);
  127         a = gf128_add(agc->hash, gf128_read(enccntr));
  128         gf128_write(a, digest);
  129 
  130         explicit_bzero(enccntr, sizeof enccntr);
  131 }

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

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sys/opencrypto/gmac.c