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