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/*
* 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 https://opensource.org/licenses/CDDL-1.0.
* 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/zfs_context.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.
*
* 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_MEMORY: 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 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), KM_SLEEP)) == 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));
if (error == CRYPTO_SUCCESS) {
*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 embedded 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);
memset(ctx_tmpl->ct_prov_tmpl, 0, ctx_tmpl->ct_size);
kmem_free(ctx_tmpl->ct_prov_tmpl, ctx_tmpl->ct_size);
kmem_free(ctx_tmpl, sizeof (kcf_ctx_template_t));
}
#if defined(_KERNEL)
EXPORT_SYMBOL(crypto_create_ctx_template);
EXPORT_SYMBOL(crypto_destroy_ctx_template);
#endif
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