diff options
Diffstat (limited to 'sys/crypto/aesni/aesni_hash.c')
| -rw-r--r-- | sys/crypto/aesni/aesni_hash.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/sys/crypto/aesni/aesni_hash.c b/sys/crypto/aesni/aesni_hash.c new file mode 100644 index 0000000..84125aa --- /dev/null +++ b/sys/crypto/aesni/aesni_hash.c @@ -0,0 +1,186 @@ +/*- + * Copyright (c) 2015 Ermal LUÇI <eri@FreeBSD.org> + * All rights reserved. + * + * 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 AUTHORS 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 AUTHORS 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. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/malloc.h> + +#include <opencrypto/cryptosoft.h> /* for hmac_ipad_buffer and hmac_opad_buffer */ +#include <opencrypto/xform.h> + +#include "aesni.h" + +MALLOC_DECLARE(M_AESNI); + +/* + * Implementation notes. + * + * We implement all HMAC algorithms provided by crypto(9) framework so aesni can work + * with ipsec(4) for AES-CBC/AES-XTS + * + * This code was stolen from dev/glxsb/aesni_hash.c + */ + +static void +aesni_hash_key_setup(struct aesni_session *ses, caddr_t key, int klen) +{ + struct auth_hash *axf; + int i; + + klen /= 8; + axf = ses->ses_axf; + + for (i = 0; i < klen; i++) + key[i] ^= HMAC_IPAD_VAL; + + axf->Init(ses->ses_ictx); + axf->Update(ses->ses_ictx, key, klen); + axf->Update(ses->ses_ictx, hmac_ipad_buffer, axf->blocksize - klen); + + for (i = 0; i < klen; i++) + key[i] ^= (HMAC_IPAD_VAL ^ HMAC_OPAD_VAL); + + axf->Init(ses->ses_octx); + axf->Update(ses->ses_octx, key, klen); + axf->Update(ses->ses_octx, hmac_opad_buffer, axf->blocksize - klen); + + for (i = 0; i < klen; i++) + key[i] ^= HMAC_OPAD_VAL; +} + +/* + * Compute keyed-hash authenticator. + */ +static int +aesni_authcompute(struct aesni_session *ses, struct cryptodesc *crd, + caddr_t buf, int flags) +{ + u_char hash[HASH_MAX_LEN]; + struct auth_hash *axf; + union authctx ctx; + int error; + + axf = ses->ses_axf; + bcopy(ses->ses_ictx, &ctx, axf->ctxsize); + error = crypto_apply(flags, buf, crd->crd_skip, crd->crd_len, + (int (*)(void *, void *, unsigned int))axf->Update, (caddr_t)&ctx); + if (error != 0) + return (error); + axf->Final(hash, &ctx); + + bcopy(ses->ses_octx, &ctx, axf->ctxsize); + axf->Update(&ctx, hash, axf->hashsize); + axf->Final(hash, &ctx); + + /* Inject the authentication data */ + crypto_copyback(flags, buf, crd->crd_inject, + ses->ses_mlen == 0 ? axf->hashsize : ses->ses_mlen, hash); + + return (0); +} + +int +aesni_hash_setup(struct aesni_session *ses, struct cryptoini *macini) +{ + + ses->ses_mlen = macini->cri_mlen; + + /* Find software structure which describes HMAC algorithm. */ + switch (macini->cri_alg) { + case CRYPTO_NULL_HMAC: + ses->ses_axf = &auth_hash_null; + break; + case CRYPTO_MD5_HMAC: + ses->ses_axf = &auth_hash_hmac_md5; + break; + case CRYPTO_SHA1_HMAC: + ses->ses_axf = &auth_hash_hmac_sha1; + break; + case CRYPTO_SHA2_256_HMAC: + ses->ses_axf = &auth_hash_hmac_sha2_256; + break; + case CRYPTO_SHA2_384_HMAC: + ses->ses_axf = &auth_hash_hmac_sha2_384; + break; + case CRYPTO_SHA2_512_HMAC: + ses->ses_axf = &auth_hash_hmac_sha2_512; + break; + default: + return EINVAL; + break; + } + + /* Allocate memory for HMAC inner and outer contexts. */ + ses->ses_ictx = malloc(ses->ses_axf->ctxsize, M_AESNI, + M_ZERO | M_NOWAIT); + if (ses->ses_ictx == NULL) + return (ENOMEM); + ses->ses_octx = malloc(ses->ses_axf->ctxsize, M_AESNI, + M_ZERO | M_NOWAIT); + if (ses->ses_octx == NULL) { + free(ses->ses_ictx, M_AESNI); + return (ENOMEM); + } + + /* Setup key if given. */ + if (macini->cri_key != NULL) { + aesni_hash_key_setup(ses, macini->cri_key, + macini->cri_klen); + } + return (0); +} + +int +aesni_hash_process(struct aesni_session *ses, struct cryptodesc *maccrd, + struct cryptop *crp) +{ + int error; + + if ((maccrd->crd_flags & CRD_F_KEY_EXPLICIT) != 0) + aesni_hash_key_setup(ses, maccrd->crd_key, maccrd->crd_klen); + + error = aesni_authcompute(ses, maccrd, crp->crp_buf, crp->crp_flags); + return (error); +} + +void +aesni_hash_free(struct aesni_session *ses) +{ + + if (ses->ses_ictx != NULL) { + bzero(ses->ses_ictx, ses->ses_axf->ctxsize); + free(ses->ses_ictx, M_AESNI); + ses->ses_ictx = NULL; + } + if (ses->ses_octx != NULL) { + bzero(ses->ses_octx, ses->ses_axf->ctxsize); + free(ses->ses_octx, M_AESNI); + ses->ses_octx = NULL; + } +} |
