120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
/*-
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* Copyright (c) 2014 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by John-Mark Gurney under
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* the sponsorship of the FreeBSD Foundation and
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* Rubicon Communications, LLC (Netgate).
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <opencrypto/gfmult.h>
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#include <opencrypto/gmac.h>
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void
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AES_GMAC_Init(struct aes_gmac_ctx *agc)
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{
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bzero(agc, sizeof *agc);
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}
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void
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AES_GMAC_Setkey(struct aes_gmac_ctx *agc, const uint8_t *key, uint16_t klen)
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{
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const uint8_t zeros[GMAC_BLOCK_LEN] = {};
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struct gf128 h;
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uint8_t hbuf[GMAC_BLOCK_LEN];
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agc->rounds = rijndaelKeySetupEnc(agc->keysched, key, klen * 8);
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rijndaelEncrypt(agc->keysched, agc->rounds, zeros, hbuf);
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h = gf128_read(hbuf);
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gf128_genmultable4(h, &agc->ghashtbl);
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explicit_bzero(&h, sizeof h);
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explicit_bzero(hbuf, sizeof hbuf);
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}
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void
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AES_GMAC_Reinit(struct aes_gmac_ctx *agc, const uint8_t *iv, uint16_t ivlen)
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{
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KASSERT(ivlen <= sizeof agc->counter, ("passed ivlen too large!"));
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bcopy(iv, agc->counter, ivlen);
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}
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int
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AES_GMAC_Update(struct aes_gmac_ctx *agc, const uint8_t *data, uint16_t len)
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{
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struct gf128 v;
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uint8_t buf[GMAC_BLOCK_LEN] = {};
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int i;
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v = agc->hash;
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while (len > 0) {
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if (len >= 4*GMAC_BLOCK_LEN) {
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i = 4*GMAC_BLOCK_LEN;
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v = gf128_mul4b(v, data, &agc->ghashtbl);
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} else if (len >= GMAC_BLOCK_LEN) {
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i = GMAC_BLOCK_LEN;
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v = gf128_add(v, gf128_read(data));
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v = gf128_mul(v, &agc->ghashtbl.tbls[0]);
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} else {
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i = len;
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bcopy(data, buf, i);
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v = gf128_add(v, gf128_read(&buf[0]));
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v = gf128_mul(v, &agc->ghashtbl.tbls[0]);
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explicit_bzero(buf, sizeof buf);
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}
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len -= i;
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data += i;
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}
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agc->hash = v;
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explicit_bzero(&v, sizeof v);
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return (0);
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}
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void
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AES_GMAC_Final(uint8_t digest[GMAC_DIGEST_LEN], struct aes_gmac_ctx *agc)
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{
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uint8_t enccntr[GMAC_BLOCK_LEN];
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struct gf128 a;
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/* XXX - zero additional bytes? */
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agc->counter[GMAC_BLOCK_LEN - 1] = 1;
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rijndaelEncrypt(agc->keysched, agc->rounds, agc->counter, enccntr);
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a = gf128_add(agc->hash, gf128_read(enccntr));
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gf128_write(a, digest);
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explicit_bzero(enccntr, sizeof enccntr);
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}
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