151 lines
4.3 KiB
C
151 lines
4.3 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#include <sys/zfs_context.h>
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#include <sys/crypto/common.h>
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#include <sys/crypto/impl.h>
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#include <sys/crypto/api.h>
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#include <sys/crypto/spi.h>
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#include <sys/crypto/sched_impl.h>
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/*
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* Crypto contexts manipulation routines
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*/
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/*
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* crypto_create_ctx_template()
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*
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* Arguments:
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*
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* mech: crypto_mechanism_t pointer.
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* mech_type is a valid value previously returned by
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* crypto_mech2id();
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* When the mech's parameter is not NULL, its definition depends
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* on the standard definition of the mechanism.
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* key: pointer to a crypto_key_t structure.
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* ptmpl: a storage for the opaque crypto_ctx_template_t, allocated and
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* initialized by the software provider this routine is
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* dispatched to.
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* kmflag: KM_SLEEP/KM_NOSLEEP mem. alloc. flag.
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*
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* Description:
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* Redirects the call to the software provider of the specified
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* mechanism. That provider will allocate and pre-compute/pre-expand
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* the context template, reusable by later calls to crypto_xxx_init().
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* The size and address of that provider context template are stored
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* in an internal structure, kcf_ctx_template_t. The address of that
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* structure is given back to the caller in *ptmpl.
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*
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* Context:
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* Process or interrupt.
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*
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* Returns:
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* CRYPTO_SUCCESS when the context template is successfully created.
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* CRYPTO_HOST_MEMORY: mem alloc failure
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* CRYPTO_ARGUMENTS_BAD: NULL storage for the ctx template.
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* RYPTO_MECHANISM_INVALID: invalid mechanism 'mech'.
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*/
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int
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crypto_create_ctx_template(crypto_mechanism_t *mech, crypto_key_t *key,
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crypto_ctx_template_t *ptmpl, int kmflag)
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{
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int error;
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kcf_mech_entry_t *me;
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kcf_provider_desc_t *pd;
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kcf_ctx_template_t *ctx_tmpl;
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crypto_mechanism_t prov_mech;
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/* A few args validation */
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if (ptmpl == NULL)
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return (CRYPTO_ARGUMENTS_BAD);
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if (mech == NULL)
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return (CRYPTO_MECHANISM_INVALID);
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error = kcf_get_sw_prov(mech->cm_type, &pd, &me, B_TRUE);
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if (error != CRYPTO_SUCCESS)
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return (error);
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if ((ctx_tmpl = (kcf_ctx_template_t *)kmem_alloc(
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sizeof (kcf_ctx_template_t), kmflag)) == NULL) {
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KCF_PROV_REFRELE(pd);
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return (CRYPTO_HOST_MEMORY);
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}
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/* Pass a mechtype that the provider understands */
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prov_mech.cm_type = KCF_TO_PROV_MECHNUM(pd, mech->cm_type);
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prov_mech.cm_param = mech->cm_param;
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prov_mech.cm_param_len = mech->cm_param_len;
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error = KCF_PROV_CREATE_CTX_TEMPLATE(pd, &prov_mech, key,
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&(ctx_tmpl->ct_prov_tmpl), &(ctx_tmpl->ct_size), KCF_RHNDL(kmflag));
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if (error == CRYPTO_SUCCESS) {
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ctx_tmpl->ct_generation = me->me_gen_swprov;
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*ptmpl = ctx_tmpl;
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} else {
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kmem_free(ctx_tmpl, sizeof (kcf_ctx_template_t));
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}
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KCF_PROV_REFRELE(pd);
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return (error);
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}
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/*
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* crypto_destroy_ctx_template()
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*
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* Arguments:
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*
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* tmpl: an opaque crypto_ctx_template_t previously created by
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* crypto_create_ctx_template()
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*
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* Description:
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* Frees the embedded crypto_spi_ctx_template_t, then the
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* kcf_ctx_template_t.
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*
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* Context:
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* Process or interrupt.
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*
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*/
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void
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crypto_destroy_ctx_template(crypto_ctx_template_t tmpl)
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{
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kcf_ctx_template_t *ctx_tmpl = (kcf_ctx_template_t *)tmpl;
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if (ctx_tmpl == NULL)
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return;
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ASSERT(ctx_tmpl->ct_prov_tmpl != NULL);
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bzero(ctx_tmpl->ct_prov_tmpl, ctx_tmpl->ct_size);
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kmem_free(ctx_tmpl->ct_prov_tmpl, ctx_tmpl->ct_size);
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kmem_free(ctx_tmpl, sizeof (kcf_ctx_template_t));
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}
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#if defined(_KERNEL)
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EXPORT_SYMBOL(crypto_create_ctx_template);
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EXPORT_SYMBOL(crypto_destroy_ctx_template);
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#endif
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