/*
 * 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 (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
 */

#include <sys/errno.h>
#include <sys/types.h>
#include <sys/kmem.h>
#include <sys/sysmacros.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>

#define CRYPTO_OPS_OFFSET(f)            offsetof(crypto_ops_t, co_##f)
#define CRYPTO_VERIFY_OFFSET(f)         offsetof(crypto_verify_ops_t, f)

/*
 * Verify entry points.
 */

/*
 * See comments for crypto_digest_init_prov().
 */
int
crypto_verify_init_prov(crypto_provider_t provider, crypto_session_id_t sid,
    crypto_mechanism_t *mech, crypto_key_t *key, crypto_ctx_template_t tmpl,
    crypto_context_t *ctxp, crypto_call_req_t *crq)
{
        int rv;
        crypto_ctx_t *ctx;
        kcf_req_params_t params;
        kcf_provider_desc_t *pd = provider;
        kcf_provider_desc_t *real_provider = pd;

        ASSERT(KCF_PROV_REFHELD(pd));

        if (pd->pd_prov_type == CRYPTO_LOGICAL_PROVIDER) {
                rv = kcf_get_hardware_provider(mech->cm_type, key,
                    CRYPTO_MECH_INVALID, NULL, pd, &real_provider,
                    CRYPTO_FG_VERIFY);

                if (rv != CRYPTO_SUCCESS)
                        return (rv);
        }

        /* Allocate and initialize the canonical context */
        if ((ctx = kcf_new_ctx(crq, real_provider, sid)) == NULL) {
                if (pd->pd_prov_type == CRYPTO_LOGICAL_PROVIDER)
                        KCF_PROV_REFRELE(real_provider);
                return (CRYPTO_HOST_MEMORY);
        }

        KCF_WRAP_VERIFY_OPS_PARAMS(&params, KCF_OP_INIT, sid, mech,
            key, NULL, NULL, tmpl);
        rv = kcf_submit_request(real_provider, ctx, crq, &params, B_FALSE);
        if (pd->pd_prov_type == CRYPTO_LOGICAL_PROVIDER)
                KCF_PROV_REFRELE(real_provider);

        if ((rv == CRYPTO_SUCCESS) || (rv == CRYPTO_QUEUED))
                *ctxp = (crypto_context_t)ctx;
        else {
                /* Release the hold done in kcf_new_ctx(). */
                KCF_CONTEXT_REFRELE((kcf_context_t *)ctx->cc_framework_private);
        }

        return (rv);
}


int
crypto_verify_init(crypto_mechanism_t *mech, crypto_key_t *key,
    crypto_ctx_template_t tmpl, crypto_context_t *ctxp, crypto_call_req_t *crq)
{
        int error;
        kcf_mech_entry_t *me;
        kcf_provider_desc_t *pd;
        kcf_prov_tried_t *list = NULL;
        kcf_ctx_template_t *ctx_tmpl;
        crypto_spi_ctx_template_t spi_ctx_tmpl = NULL;

retry:
        /* The pd is returned held */
        if ((pd = kcf_get_mech_provider(mech->cm_type, key, &me, &error,
            list, CRYPTO_FG_VERIFY, 0)) == NULL) {
                if (list != NULL)
                        kcf_free_triedlist(list);
                return (error);
        }

        /*
         * For SW providers, check the validity of the context template
         * It is very rare that the generation number mis-matches, so
         * it is acceptable to fail here, and let the consumer recover by
         * freeing this tmpl and create a new one for the key and new SW
         * provider.
         */
        if ((pd->pd_prov_type == CRYPTO_SW_PROVIDER) &&
            ((ctx_tmpl = (kcf_ctx_template_t *)tmpl) != NULL)) {
                if (ctx_tmpl->ct_generation != me->me_gen_swprov) {
                        if (list != NULL)
                                kcf_free_triedlist(list);
                        KCF_PROV_REFRELE(pd);
                        return (CRYPTO_OLD_CTX_TEMPLATE);
                } else {
                        spi_ctx_tmpl = ctx_tmpl->ct_prov_tmpl;
                }
        }

        error = crypto_verify_init_prov(pd, pd->pd_sid, mech, key, spi_ctx_tmpl,
            ctxp, crq);

        if (error != CRYPTO_SUCCESS && error != CRYPTO_QUEUED &&
            IS_RECOVERABLE(error)) {
                /* Add pd to the linked list of providers tried. */
                if (kcf_insert_triedlist(&list, pd, KCF_KMFLAG(crq)) != NULL)
                        goto retry;
        }

        if (list != NULL)
                kcf_free_triedlist(list);
        KCF_PROV_REFRELE(pd);
        return (error);
}

int
crypto_verify_single(crypto_context_t context, crypto_data_t *data,
    crypto_data_t *signature, crypto_call_req_t *cr)
{
        crypto_ctx_t *ctx = (crypto_ctx_t *)context;
        kcf_context_t *kcf_ctx;
        kcf_provider_desc_t *pd;
        int error;
        kcf_req_params_t params;

        if ((ctx == NULL) ||
            ((kcf_ctx = (kcf_context_t *)ctx->cc_framework_private) == NULL) ||
            ((pd = kcf_ctx->kc_prov_desc) == NULL)) {
                return (CRYPTO_INVALID_CONTEXT);
        }

        KCF_WRAP_VERIFY_OPS_PARAMS(&params, KCF_OP_SINGLE, 0, NULL,
            NULL, data, signature, NULL);
        error = kcf_submit_request(pd, ctx, cr, &params, B_FALSE);

        /* Release the hold done in kcf_new_ctx() during init step. */
        KCF_CONTEXT_COND_RELEASE(error, kcf_ctx);
        return (error);
}

/*
 * See comments for crypto_digest_update().
 */
int
crypto_verify_update(crypto_context_t context, crypto_data_t *data,
    crypto_call_req_t *cr)

{
        crypto_ctx_t *ctx = (crypto_ctx_t *)context;
        kcf_context_t *kcf_ctx;
        kcf_provider_desc_t *pd;
        kcf_req_params_t params;
        int rv;

        if ((ctx == NULL) ||
            ((kcf_ctx = (kcf_context_t *)ctx->cc_framework_private) == NULL) ||
            ((pd = kcf_ctx->kc_prov_desc) == NULL)) {
                return (CRYPTO_INVALID_CONTEXT);
        }

        ASSERT(pd->pd_prov_type != CRYPTO_LOGICAL_PROVIDER);
        KCF_WRAP_VERIFY_OPS_PARAMS(&params, KCF_OP_UPDATE, ctx->cc_session,
            NULL, NULL, data, NULL, NULL);
        rv = kcf_submit_request(pd, ctx, cr, &params, B_FALSE);

        return (rv);
}

/*
 * See comments for crypto_digest_final().
 */
int
crypto_verify_final(crypto_context_t context, crypto_data_t *signature,
    crypto_call_req_t *cr)
{
        crypto_ctx_t *ctx = (crypto_ctx_t *)context;
        kcf_context_t *kcf_ctx;
        kcf_provider_desc_t *pd;
        kcf_req_params_t params;
        int rv;

        if ((ctx == NULL) ||
            ((kcf_ctx = (kcf_context_t *)ctx->cc_framework_private) == NULL) ||
            ((pd = kcf_ctx->kc_prov_desc) == NULL)) {
                return (CRYPTO_INVALID_CONTEXT);
        }

        ASSERT(pd->pd_prov_type != CRYPTO_LOGICAL_PROVIDER);
        KCF_WRAP_VERIFY_OPS_PARAMS(&params, KCF_OP_FINAL, ctx->cc_session,
            NULL, NULL, NULL, signature, NULL);
        rv = kcf_submit_request(pd, ctx, cr, &params, B_FALSE);

        /* Release the hold done in kcf_new_ctx() during init step. */
        KCF_CONTEXT_COND_RELEASE(rv, kcf_ctx);
        return (rv);
}

int
crypto_verify_prov(crypto_provider_t provider, crypto_session_id_t sid,
    crypto_mechanism_t *mech, crypto_key_t *key, crypto_data_t *data,
    crypto_ctx_template_t tmpl, crypto_data_t *signature,
    crypto_call_req_t *crq)
{
        kcf_req_params_t params;
        kcf_provider_desc_t *pd = provider;
        kcf_provider_desc_t *real_provider = pd;
        int rv;

        ASSERT(KCF_PROV_REFHELD(pd));

        if (pd->pd_prov_type == CRYPTO_LOGICAL_PROVIDER) {
                rv = kcf_get_hardware_provider(mech->cm_type, key,
                    CRYPTO_MECH_INVALID, NULL, pd, &real_provider,
                    CRYPTO_FG_VERIFY_ATOMIC);

                if (rv != CRYPTO_SUCCESS)
                        return (rv);
        }
        KCF_WRAP_VERIFY_OPS_PARAMS(&params, KCF_OP_ATOMIC, sid, mech,
            key, data, signature, tmpl);
        rv = kcf_submit_request(real_provider, NULL, crq, &params, B_FALSE);
        if (pd->pd_prov_type == CRYPTO_LOGICAL_PROVIDER)
                KCF_PROV_REFRELE(real_provider);

        return (rv);
}

static int
verify_vr_atomic_common(crypto_mechanism_t *mech, crypto_key_t *key,
    crypto_data_t *data, crypto_ctx_template_t tmpl, crypto_data_t *signature,
    crypto_call_req_t *crq, crypto_func_group_t fg)
{
        int error;
        kcf_mech_entry_t *me;
        kcf_provider_desc_t *pd;
        kcf_req_params_t params;
        kcf_prov_tried_t *list = NULL;
        kcf_ctx_template_t *ctx_tmpl;
        crypto_spi_ctx_template_t spi_ctx_tmpl = NULL;

retry:
        /* The pd is returned held */
        if ((pd = kcf_get_mech_provider(mech->cm_type, key, &me, &error,
            list, fg, data->cd_length)) == NULL) {
                if (list != NULL)
                        kcf_free_triedlist(list);
                return (error);
        }

        /*
         * For SW providers, check the validity of the context template
         * It is very rare that the generation number mis-matches, so
         * it is acceptable to fail here, and let the consumer recover by
         * freeing this tmpl and create a new one for the key and new SW
         * provider.
         */
        if ((pd->pd_prov_type == CRYPTO_SW_PROVIDER) &&
            ((ctx_tmpl = (kcf_ctx_template_t *)tmpl) != NULL)) {
                if (ctx_tmpl->ct_generation != me->me_gen_swprov) {
                        if (list != NULL)
                                kcf_free_triedlist(list);
                        KCF_PROV_REFRELE(pd);
                        return (CRYPTO_OLD_CTX_TEMPLATE);
                } else {
                        spi_ctx_tmpl = ctx_tmpl->ct_prov_tmpl;
                }
        }

        /* The fast path for SW providers. */
        if (CHECK_FASTPATH(crq, pd)) {
                crypto_mechanism_t lmech;

                lmech = *mech;
                KCF_SET_PROVIDER_MECHNUM(mech->cm_type, pd, &lmech);
                if (fg == CRYPTO_FG_VERIFY_ATOMIC)
                        error = KCF_PROV_VERIFY_ATOMIC(pd, pd->pd_sid, &lmech,
                            key, data, spi_ctx_tmpl, signature,
                            KCF_SWFP_RHNDL(crq));
                else
                        /* Note: The argument order is different from above */
                        error = KCF_PROV_VERIFY_RECOVER_ATOMIC(pd, pd->pd_sid,
                            &lmech, key, signature, spi_ctx_tmpl, data,
                            KCF_SWFP_RHNDL(crq));
                KCF_PROV_INCRSTATS(pd, error);
        } else {
                kcf_op_type_t op = ((fg == CRYPTO_FG_VERIFY_ATOMIC) ?
                    KCF_OP_ATOMIC : KCF_OP_VERIFY_RECOVER_ATOMIC);

                KCF_WRAP_VERIFY_OPS_PARAMS(&params, op, pd->pd_sid,
                    mech, key, data, signature, spi_ctx_tmpl);

                /* no crypto context to carry between multiple parts. */
                error = kcf_submit_request(pd, NULL, crq, &params, B_FALSE);
        }

        if (error != CRYPTO_SUCCESS && error != CRYPTO_QUEUED &&
            IS_RECOVERABLE(error)) {
                /* Add pd to the linked list of providers tried. */
                if (kcf_insert_triedlist(&list, pd, KCF_KMFLAG(crq)) != NULL)
                        goto retry;
        }

        if (list != NULL)
                kcf_free_triedlist(list);

        KCF_PROV_REFRELE(pd);
        return (error);
}

int
crypto_verify(crypto_mechanism_t *mech, crypto_key_t *key, crypto_data_t *data,
    crypto_ctx_template_t tmpl, crypto_data_t *signature,
    crypto_call_req_t *crq)
{
        return (verify_vr_atomic_common(mech, key, data, tmpl, signature, crq,
            CRYPTO_FG_VERIFY_ATOMIC));
}

int
crypto_verify_recover_prov(crypto_provider_t provider, crypto_session_id_t sid,
    crypto_mechanism_t *mech, crypto_key_t *key, crypto_data_t *signature,
    crypto_ctx_template_t tmpl, crypto_data_t *data, crypto_call_req_t *crq)
{
        kcf_req_params_t params;
        kcf_provider_desc_t *pd = provider;
        kcf_provider_desc_t *real_provider = pd;
        int rv;

        ASSERT(KCF_PROV_REFHELD(pd));

        if (pd->pd_prov_type == CRYPTO_LOGICAL_PROVIDER) {
                rv = kcf_get_hardware_provider(mech->cm_type, key,
                    CRYPTO_MECH_INVALID, NULL, pd, &real_provider,
                    CRYPTO_FG_VERIFY_RECOVER_ATOMIC);

                if (rv != CRYPTO_SUCCESS)
                        return (rv);
        }
        KCF_WRAP_VERIFY_OPS_PARAMS(&params, KCF_OP_VERIFY_RECOVER_ATOMIC,
            sid, mech, key, data, signature, tmpl);
        rv = kcf_submit_request(real_provider, NULL, crq, &params, B_FALSE);
        if (pd->pd_prov_type == CRYPTO_LOGICAL_PROVIDER)
                KCF_PROV_REFRELE(real_provider);

        return (rv);
}

int
crypto_verify_recover(crypto_mechanism_t *mech, crypto_key_t *key,
    crypto_data_t *signature, crypto_ctx_template_t tmpl, crypto_data_t *data,
    crypto_call_req_t *crq)
{
        return (verify_vr_atomic_common(mech, key, data, tmpl, signature, crq,
            CRYPTO_FG_VERIFY_RECOVER_ATOMIC));
}

int
crypto_verify_recover_init_prov(crypto_provider_t provider,
    crypto_session_id_t sid, crypto_mechanism_t *mech, crypto_key_t *key,
    crypto_ctx_template_t tmpl, crypto_context_t *ctxp, crypto_call_req_t *crq)
{
        int rv;
        crypto_ctx_t *ctx;
        kcf_req_params_t params;
        kcf_provider_desc_t *pd = provider;
        kcf_provider_desc_t *real_provider = pd;

        ASSERT(KCF_PROV_REFHELD(pd));

        if (pd->pd_prov_type == CRYPTO_LOGICAL_PROVIDER) {
                rv = kcf_get_hardware_provider(mech->cm_type, key,
                    CRYPTO_MECH_INVALID, NULL, pd, &real_provider,
                    CRYPTO_FG_VERIFY_RECOVER);

                if (rv != CRYPTO_SUCCESS)
                        return (rv);
        }

        /* Allocate and initialize the canonical context */
        if ((ctx = kcf_new_ctx(crq, real_provider, sid)) == NULL) {
                if (pd->pd_prov_type == CRYPTO_LOGICAL_PROVIDER)
                        KCF_PROV_REFRELE(real_provider);
                return (CRYPTO_HOST_MEMORY);
        }

        KCF_WRAP_VERIFY_OPS_PARAMS(&params, KCF_OP_VERIFY_RECOVER_INIT,
            sid, mech, key, NULL, NULL, tmpl);
        rv = kcf_submit_request(real_provider, ctx, crq, &params, B_FALSE);
        if (pd->pd_prov_type == CRYPTO_LOGICAL_PROVIDER)
                KCF_PROV_REFRELE(real_provider);

        if ((rv == CRYPTO_SUCCESS) || (rv == CRYPTO_QUEUED))
                *ctxp = (crypto_context_t)ctx;
        else {
                /* Release the hold done in kcf_new_ctx(). */
                KCF_CONTEXT_REFRELE((kcf_context_t *)ctx->cc_framework_private);
        }

        return (rv);
}

int
crypto_verify_recover_single(crypto_context_t context, crypto_data_t *signature,
    crypto_data_t *data, crypto_call_req_t *cr)
{
        crypto_ctx_t *ctx = (crypto_ctx_t *)context;
        kcf_context_t *kcf_ctx;
        kcf_provider_desc_t *pd;
        int error;
        kcf_req_params_t params;

        if ((ctx == NULL) ||
            ((kcf_ctx = (kcf_context_t *)ctx->cc_framework_private) == NULL) ||
            ((pd = kcf_ctx->kc_prov_desc) == NULL)) {
                return (CRYPTO_INVALID_CONTEXT);
        }

        KCF_WRAP_VERIFY_OPS_PARAMS(&params, KCF_OP_VERIFY_RECOVER, 0, NULL,
            NULL, data, signature, NULL);
        error = kcf_submit_request(pd, ctx, cr, &params, B_FALSE);

        /* Release the hold done in kcf_new_ctx() during init step. */
        KCF_CONTEXT_COND_RELEASE(error, kcf_ctx);
        return (error);
}