356c922f74
Previously, these values were only cleared in AES_GMAC_Init(), so a second set of operations could reuse the final hash as the initial hash. Currently this bug does not trigger in cryptosoft as existing GMAC and GCM operations always use an on-stack auth context initialized from a template context. Reviewed by: markj Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D33315
133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
/*-
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* Copyright (c) 2014 The FreeBSD Foundation
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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(void *ctx)
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{
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struct aes_gmac_ctx *agc;
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agc = ctx;
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bzero(agc, sizeof *agc);
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}
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void
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AES_GMAC_Setkey(void *ctx, const uint8_t *key, u_int klen)
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{
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struct aes_gmac_ctx *agc;
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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 = ctx;
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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(void *ctx, const uint8_t *iv, u_int ivlen)
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{
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struct aes_gmac_ctx *agc;
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agc = ctx;
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KASSERT(ivlen <= sizeof agc->counter, ("passed ivlen too large!"));
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memset(agc->counter, 0, sizeof(agc->counter));
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bcopy(iv, agc->counter, ivlen);
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agc->counter[GMAC_BLOCK_LEN - 1] = 1;
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memset(&agc->hash, 0, sizeof(agc->hash));
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}
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int
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AES_GMAC_Update(void *ctx, const void *vdata, u_int len)
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{
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struct aes_gmac_ctx *agc;
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const uint8_t *data;
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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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agc = ctx;
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data = vdata;
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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, void *ctx)
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{
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struct aes_gmac_ctx *agc;
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uint8_t enccntr[GMAC_BLOCK_LEN];
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struct gf128 a;
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agc = ctx;
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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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