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325 lines
7.4 KiB
C
325 lines
7.4 KiB
C
/*-
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* Copyright (c) 2018 Conrad Meyer <cem@FreeBSD.org>
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* All rights reserved.
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*
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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 AUTHORS 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 AUTHORS 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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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/kobj.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/smp.h>
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#include <blake2.h>
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#include <opencrypto/cryptodev.h>
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#include <cryptodev_if.h>
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#include <machine/fpu.h>
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struct blake2_session {
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size_t mlen;
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};
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CTASSERT((size_t)BLAKE2B_KEYBYTES > (size_t)BLAKE2S_KEYBYTES);
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struct blake2_softc {
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int32_t cid;
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};
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static int blake2_cipher_setup(struct blake2_session *ses,
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const struct crypto_session_params *csp);
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static int blake2_cipher_process(struct blake2_session *ses,
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struct cryptop *crp);
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MALLOC_DEFINE(M_BLAKE2, "blake2_data", "Blake2 Data");
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static void
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blake2_identify(driver_t *drv, device_t parent)
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{
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/* NB: order 10 is so we get attached after h/w devices */
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if (device_find_child(parent, "blaketwo", -1) == NULL &&
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BUS_ADD_CHILD(parent, 10, "blaketwo", -1) == 0)
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panic("blaketwo: could not attach");
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}
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static int
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blake2_probe(device_t dev)
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{
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device_set_desc(dev, "Blake2");
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return (0);
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}
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static int
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blake2_attach(device_t dev)
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{
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struct blake2_softc *sc;
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sc = device_get_softc(dev);
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sc->cid = crypto_get_driverid(dev, sizeof(struct blake2_session),
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CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_SYNC |
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CRYPTOCAP_F_ACCEL_SOFTWARE);
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if (sc->cid < 0) {
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device_printf(dev, "Could not get crypto driver id.\n");
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return (ENOMEM);
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}
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return (0);
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}
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static int
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blake2_detach(device_t dev)
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{
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struct blake2_softc *sc;
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sc = device_get_softc(dev);
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crypto_unregister_all(sc->cid);
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return (0);
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}
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static int
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blake2_probesession(device_t dev, const struct crypto_session_params *csp)
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{
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if (csp->csp_flags != 0)
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return (EINVAL);
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switch (csp->csp_mode) {
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case CSP_MODE_DIGEST:
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switch (csp->csp_auth_alg) {
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case CRYPTO_BLAKE2B:
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case CRYPTO_BLAKE2S:
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break;
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default:
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return (EINVAL);
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}
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break;
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default:
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return (EINVAL);
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}
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return (CRYPTODEV_PROBE_ACCEL_SOFTWARE);
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}
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static int
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blake2_newsession(device_t dev, crypto_session_t cses,
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const struct crypto_session_params *csp)
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{
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struct blake2_session *ses;
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int error;
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ses = crypto_get_driver_session(cses);
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error = blake2_cipher_setup(ses, csp);
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if (error != 0) {
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CRYPTDEB("setup failed");
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return (error);
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}
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return (0);
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}
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static int
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blake2_process(device_t dev, struct cryptop *crp, int hint __unused)
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{
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struct blake2_session *ses;
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int error;
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ses = crypto_get_driver_session(crp->crp_session);
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error = blake2_cipher_process(ses, crp);
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crp->crp_etype = error;
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crypto_done(crp);
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return (0);
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}
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static device_method_t blake2_methods[] = {
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DEVMETHOD(device_identify, blake2_identify),
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DEVMETHOD(device_probe, blake2_probe),
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DEVMETHOD(device_attach, blake2_attach),
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DEVMETHOD(device_detach, blake2_detach),
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DEVMETHOD(cryptodev_probesession, blake2_probesession),
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DEVMETHOD(cryptodev_newsession, blake2_newsession),
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DEVMETHOD(cryptodev_process, blake2_process),
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DEVMETHOD_END
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};
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static driver_t blake2_driver = {
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"blaketwo",
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blake2_methods,
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sizeof(struct blake2_softc),
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};
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DRIVER_MODULE(blake2, nexus, blake2_driver, 0, 0);
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MODULE_VERSION(blake2, 1);
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MODULE_DEPEND(blake2, crypto, 1, 1, 1);
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static bool
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blake2_check_klen(const struct crypto_session_params *csp, unsigned klen)
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{
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if (csp->csp_auth_alg == CRYPTO_BLAKE2S)
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return (klen <= BLAKE2S_KEYBYTES);
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else
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return (klen <= BLAKE2B_KEYBYTES);
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}
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static int
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blake2_cipher_setup(struct blake2_session *ses,
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const struct crypto_session_params *csp)
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{
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int hashlen;
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CTASSERT((size_t)BLAKE2S_OUTBYTES <= (size_t)BLAKE2B_OUTBYTES);
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if (!blake2_check_klen(csp, csp->csp_auth_klen))
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return (EINVAL);
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if (csp->csp_auth_mlen < 0)
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return (EINVAL);
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switch (csp->csp_auth_alg) {
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case CRYPTO_BLAKE2S:
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hashlen = BLAKE2S_OUTBYTES;
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break;
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case CRYPTO_BLAKE2B:
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hashlen = BLAKE2B_OUTBYTES;
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break;
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default:
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return (EINVAL);
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}
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if (csp->csp_auth_mlen > hashlen)
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return (EINVAL);
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if (csp->csp_auth_mlen == 0)
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ses->mlen = hashlen;
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else
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ses->mlen = csp->csp_auth_mlen;
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return (0);
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}
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static int
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blake2b_applicator(void *state, const void *buf, u_int len)
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{
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int rc;
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rc = blake2b_update(state, buf, len);
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if (rc != 0)
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return (EINVAL);
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return (0);
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}
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static int
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blake2s_applicator(void *state, const void *buf, u_int len)
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{
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int rc;
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rc = blake2s_update(state, buf, len);
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if (rc != 0)
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return (EINVAL);
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return (0);
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}
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static int
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blake2_cipher_process(struct blake2_session *ses, struct cryptop *crp)
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{
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union {
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blake2b_state sb;
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blake2s_state ss;
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} bctx;
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char res[BLAKE2B_OUTBYTES], res2[BLAKE2B_OUTBYTES];
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const struct crypto_session_params *csp;
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const void *key;
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int error, rc;
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unsigned klen;
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csp = crypto_get_params(crp->crp_session);
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if (crp->crp_auth_key != NULL)
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key = crp->crp_auth_key;
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else
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key = csp->csp_auth_key;
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klen = csp->csp_auth_klen;
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fpu_kern_enter(curthread, NULL, FPU_KERN_NORMAL | FPU_KERN_NOCTX);
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switch (csp->csp_auth_alg) {
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case CRYPTO_BLAKE2B:
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if (klen > 0)
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rc = blake2b_init_key(&bctx.sb, ses->mlen, key, klen);
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else
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rc = blake2b_init(&bctx.sb, ses->mlen);
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if (rc != 0) {
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error = EINVAL;
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break;
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}
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error = crypto_apply(crp, crp->crp_payload_start,
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crp->crp_payload_length, blake2b_applicator, &bctx.sb);
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if (error != 0)
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break;
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rc = blake2b_final(&bctx.sb, res, ses->mlen);
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if (rc != 0)
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error = EINVAL;
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break;
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case CRYPTO_BLAKE2S:
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if (klen > 0)
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rc = blake2s_init_key(&bctx.ss, ses->mlen, key, klen);
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else
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rc = blake2s_init(&bctx.ss, ses->mlen);
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if (rc != 0) {
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error = EINVAL;
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break;
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}
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error = crypto_apply(crp, crp->crp_payload_start,
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crp->crp_payload_length, blake2s_applicator, &bctx.ss);
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if (error != 0)
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break;
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rc = blake2s_final(&bctx.ss, res, ses->mlen);
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if (rc != 0)
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error = EINVAL;
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break;
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default:
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__assert_unreachable();
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}
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fpu_kern_leave(curthread, NULL);
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if (error != 0)
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return (error);
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if (crp->crp_op & CRYPTO_OP_VERIFY_DIGEST) {
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crypto_copydata(crp, crp->crp_digest_start, ses->mlen, res2);
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if (timingsafe_bcmp(res, res2, ses->mlen) != 0)
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error = EBADMSG;
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} else
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crypto_copyback(crp, crp->crp_digest_start, ses->mlen, res);
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return (error);
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}
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