FreeBSD/Linux Kernel Cross Reference
sys/dev/glxsb/glxsb_hash.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@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/xform.h>
    
    #include "glxsb.h"
    
    /*
     * Implementation notes.
     *
     * The Geode LX Security Block provides AES-128-CBC acceleration.
     * We implement all HMAC algorithms provided by crypto(9) framework so glxsb can work
     * with ipsec(4)
     *
     * This code was stolen from crypto/via/padlock_hash.c
     */
    
    MALLOC_DECLARE(M_GLXSB);
    
    static void
    glxsb_hash_key_setup(struct glxsb_session *ses, const char *key, int klen)
    {
            const struct auth_hash *axf;
    
            axf = ses->ses_axf;
            hmac_init_ipad(axf, key, klen, ses->ses_ictx);
            hmac_init_opad(axf, key, klen, ses->ses_octx);
    }
    
    /*
     * Compute keyed-hash authenticator.
     */
    static int
    glxsb_authcompute(struct glxsb_session *ses, struct cryptop *crp)
    {
            u_char hash[HASH_MAX_LEN];
            const struct auth_hash *axf;
            union authctx ctx;
            int error;
    
            axf = ses->ses_axf;
            bcopy(ses->ses_ictx, &ctx, axf->ctxsize);
            error = crypto_apply(crp, crp->crp_aad_start, crp->crp_aad_length,
                axf->Update, &ctx);
            if (error != 0)
                    return (error);
            error = crypto_apply(crp, crp->crp_payload_start,
                crp->crp_payload_length, axf->Update, &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);
            explicit_bzero(&ctx, sizeof(ctx));
    
            /* Verify or inject the authentication data */
            if (crp->crp_op & CRYPTO_OP_VERIFY_DIGEST) {
                    u_char hash2[HASH_MAX_LEN];
    
                    crypto_copydata(crp, crp->crp_digest_start, ses->ses_mlen,
                        hash2);
                    if (timingsafe_bcmp(hash, hash2, ses->ses_mlen) != 0)
                            error = EBADMSG;
                    explicit_bzero(hash2, sizeof(hash2));
           } else
                   crypto_copyback(crp, crp->crp_digest_start, ses->ses_mlen,
                       hash);
           explicit_bzero(hash, sizeof(hash));
           return (error);
   }
   
   int
   glxsb_hash_setup(struct glxsb_session *ses,
       const struct crypto_session_params *csp)
   {
   
           ses->ses_axf = crypto_auth_hash(csp);
           if (csp->csp_auth_mlen == 0)
                   ses->ses_mlen = ses->ses_axf->hashsize;
           else
                   ses->ses_mlen = csp->csp_auth_mlen;
   
           /* Allocate memory for HMAC inner and outer contexts. */
           ses->ses_ictx = malloc(ses->ses_axf->ctxsize, M_GLXSB,
               M_ZERO | M_NOWAIT);
           ses->ses_octx = malloc(ses->ses_axf->ctxsize, M_GLXSB,
               M_ZERO | M_NOWAIT);
           if (ses->ses_ictx == NULL || ses->ses_octx == NULL)
                   return (ENOMEM);
   
           /* Setup key if given. */
           if (csp->csp_auth_key != NULL) {
                   glxsb_hash_key_setup(ses, csp->csp_auth_key,
                       csp->csp_auth_klen);
           }
           return (0);
   }
   
   int
   glxsb_hash_process(struct glxsb_session *ses,
       const struct crypto_session_params *csp, struct cryptop *crp)
   {
           int error;
   
           if (crp->crp_auth_key != NULL)
                   glxsb_hash_key_setup(ses, crp->crp_auth_key,
                       csp->csp_auth_klen);
   
           error = glxsb_authcompute(ses, crp);
           return (error);
   }
   
   void
   glxsb_hash_free(struct glxsb_session *ses)
   {
   
           if (ses->ses_ictx != NULL) {
                   zfree(ses->ses_ictx, M_GLXSB);
                   ses->ses_ictx = NULL;
           }
           if (ses->ses_octx != NULL) {
                   zfree(ses->ses_octx, M_GLXSB);
                   ses->ses_octx = NULL;
           }
   }

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