/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <sys/errno.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/kmem.h>
#include <sys/crypto/common.h>
#include <sys/crypto/impl.h>
#include <sys/crypto/api.h>
#include <sys/crypto/spi.h>
#include <sys/crypto/sched_impl.h>

/*
 * Crypto contexts manipulation routines
 */

/*
 * crypto_create_ctx_template()
 *
 * Arguments:
 *
 *      mech:   crypto_mechanism_t pointer.
 *              mech_type is a valid value previously returned by
 *              crypto_mech2id();
 *              When the mech's parameter is not NULL, its definition depends
 *              on the standard definition of the mechanism.
 *      key:    pointer to a crypto_key_t structure.
 *      ptmpl:  a storage for the opaque crypto_ctx_template_t, allocated and
 *              initialized by the software provider this routine is
 *              dispatched to.
 *      kmflag: KM_SLEEP/KM_NOSLEEP mem. alloc. flag.
 *
 * Description:
 *      Redirects the call to the software provider of the specified
 *      mechanism. That provider will allocate and pre-compute/pre-expand
 *      the context template, reusable by later calls to crypto_xxx_init().
 *      The size and address of that provider context template are stored
 *      in an internal structure, kcf_ctx_template_t. The address of that
 *      structure is given back to the caller in *ptmpl.
 *
 * Context:
 *      Process or interrupt.
 *
 * Returns:
 *      CRYPTO_SUCCESS when the context template is successfully created.
 *      CRYPTO_HOST_MEMEORY: mem alloc failure
 *      CRYPTO_ARGUMENTS_BAD: NULL storage for the ctx template.
 *      RYPTO_MECHANISM_INVALID: invalid mechanism 'mech'.
 */
int
crypto_create_ctx_template(crypto_mechanism_t *mech, crypto_key_t *key,
    crypto_ctx_template_t *ptmpl, int kmflag)
{
        int error;
        kcf_mech_entry_t *me;
        kcf_provider_desc_t *pd;
        kcf_ctx_template_t *ctx_tmpl;
        crypto_mechanism_t prov_mech;

        /* A few args validation */

        if (ptmpl == NULL)
                return (CRYPTO_ARGUMENTS_BAD);

        if (mech == NULL)
                return (CRYPTO_MECHANISM_INVALID);

        error = kcf_get_sw_prov(mech->cm_type, &pd, &me, B_TRUE);
        if (error != CRYPTO_SUCCESS)
                return (error);

        if ((ctx_tmpl = (kcf_ctx_template_t *)kmem_alloc(
            sizeof (kcf_ctx_template_t), kmflag)) == NULL) {
                KCF_PROV_REFRELE(pd);
                return (CRYPTO_HOST_MEMORY);
        }

        /* Pass a mechtype that the provider understands */
        prov_mech.cm_type = KCF_TO_PROV_MECHNUM(pd, mech->cm_type);
        prov_mech.cm_param = mech->cm_param;
        prov_mech.cm_param_len = mech->cm_param_len;

        error = KCF_PROV_CREATE_CTX_TEMPLATE(pd, &prov_mech, key,
            &(ctx_tmpl->ct_prov_tmpl), &(ctx_tmpl->ct_size), KCF_RHNDL(kmflag));

        if (error == CRYPTO_SUCCESS) {
                ctx_tmpl->ct_generation = me->me_gen_swprov;
                *ptmpl = ctx_tmpl;
        } else {
                kmem_free(ctx_tmpl, sizeof (kcf_ctx_template_t));
        }
        KCF_PROV_REFRELE(pd);

        return (error);
}

/*
 * crypto_destroy_ctx_template()
 *
 * Arguments:
 *
 *      tmpl:   an opaque crypto_ctx_template_t previously created by
 *              crypto_create_ctx_template()
 *
 * Description:
 *      Frees the inbedded crypto_spi_ctx_template_t, then the
 *      kcf_ctx_template_t.
 *
 * Context:
 *      Process or interrupt.
 *
 */
void
crypto_destroy_ctx_template(crypto_ctx_template_t tmpl)
{
        kcf_ctx_template_t *ctx_tmpl = (kcf_ctx_template_t *)tmpl;

        if (ctx_tmpl == NULL)
                return;

        ASSERT(ctx_tmpl->ct_prov_tmpl != NULL);

        bzero(ctx_tmpl->ct_prov_tmpl, ctx_tmpl->ct_size);
        kmem_free(ctx_tmpl->ct_prov_tmpl, ctx_tmpl->ct_size);
        kmem_free(ctx_tmpl, sizeof (kcf_ctx_template_t));
}