FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/icp/api/kcf_cipher.c

     /*
      * 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>
    
    /*
     * Encryption and decryption routines.
     */
    
    
    /*
     * crypto_encrypt()
     *
     * Arguments:
     *      sid:    session id
     *      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.
     *      plaintext: The message to be encrypted
     *      ciphertext: Storage for the encrypted message. The length needed
     *              depends on the mechanism, and the plaintext's size.
     *      tmpl:   a crypto_ctx_template_t, opaque template of a context of an
     *              encryption with the 'mech' using 'key'. 'tmpl' is created by
     *              a previous call to crypto_create_ctx_template().
     *
     * Description:
     *      Asynchronously submits a request for, or synchronously performs a
     *      single-part encryption of 'plaintext' with the mechanism 'mech', using
     *      the key 'key'.
     *      When complete and successful, 'ciphertext' will contain the encrypted
     *      message.
     *      Relies on the KCF scheduler to pick a provider.
     *
     * Returns:
     *      See comment in the beginning of the file.
     */
    int
    crypto_encrypt(crypto_mechanism_t *mech, crypto_data_t *plaintext,
        crypto_key_t *key, crypto_ctx_template_t tmpl, crypto_data_t *ciphertext)
    {
            int error;
            kcf_mech_entry_t *me;
            kcf_provider_desc_t *pd;
            kcf_ctx_template_t *ctx_tmpl;
            crypto_spi_ctx_template_t spi_ctx_tmpl = NULL;
            kcf_prov_tried_t *list = NULL;
    
    retry:
            /* pd is returned held */
            if ((pd = kcf_get_mech_provider(mech->cm_type, &me, &error,
                list, CRYPTO_FG_ENCRYPT_ATOMIC)) == NULL) {
                    if (list != NULL)
                            kcf_free_triedlist(list);
                    return (error);
            }
    
            if (((ctx_tmpl = (kcf_ctx_template_t *)tmpl) != NULL))
                    spi_ctx_tmpl = ctx_tmpl->ct_prov_tmpl;
    
            crypto_mechanism_t lmech = *mech;
            KCF_SET_PROVIDER_MECHNUM(mech->cm_type, pd, &lmech);
            error = KCF_PROV_ENCRYPT_ATOMIC(pd, &lmech, key,
                plaintext, ciphertext, spi_ctx_tmpl);
    
            if (error != CRYPTO_SUCCESS && IS_RECOVERABLE(error)) {
                    /* Add pd to the linked list of providers tried. */
                    if (kcf_insert_triedlist(&list, pd, KM_SLEEP) != NULL)
                            goto retry;
            }
   
           if (list != NULL)
                   kcf_free_triedlist(list);
   
           KCF_PROV_REFRELE(pd);
           return (error);
   }
   
   /*
    * crypto_decrypt_prov()
    *
    * Arguments:
    *      pd:     provider descriptor
    *      sid:    session id
    *      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.
    *      ciphertext: The message to be encrypted
    *      plaintext: Storage for the encrypted message. The length needed
    *              depends on the mechanism, and the plaintext's size.
    *      tmpl:   a crypto_ctx_template_t, opaque template of a context of an
    *              encryption with the 'mech' using 'key'. 'tmpl' is created by
    *              a previous call to crypto_create_ctx_template().
    *
    * Description:
    *      Asynchronously submits a request for, or synchronously performs a
    *      single-part decryption of 'ciphertext' with the mechanism 'mech', using
    *      the key 'key'.
    *      When complete and successful, 'plaintext' will contain the decrypted
    *      message.
    *      Relies on the KCF scheduler to choose a provider.
    *
    * Returns:
    *      See comment in the beginning of the file.
    */
   int
   crypto_decrypt(crypto_mechanism_t *mech, crypto_data_t *ciphertext,
       crypto_key_t *key, crypto_ctx_template_t tmpl, crypto_data_t *plaintext)
   {
           int error;
           kcf_mech_entry_t *me;
           kcf_provider_desc_t *pd;
           kcf_ctx_template_t *ctx_tmpl;
           crypto_spi_ctx_template_t spi_ctx_tmpl = NULL;
           kcf_prov_tried_t *list = NULL;
   
   retry:
           /* pd is returned held */
           if ((pd = kcf_get_mech_provider(mech->cm_type, &me, &error,
               list, CRYPTO_FG_DECRYPT_ATOMIC)) == NULL) {
                   if (list != NULL)
                           kcf_free_triedlist(list);
                   return (error);
           }
   
           if (((ctx_tmpl = (kcf_ctx_template_t *)tmpl) != NULL))
                   spi_ctx_tmpl = ctx_tmpl->ct_prov_tmpl;
   
           crypto_mechanism_t lmech = *mech;
           KCF_SET_PROVIDER_MECHNUM(mech->cm_type, pd, &lmech);
   
           error = KCF_PROV_DECRYPT_ATOMIC(pd, &lmech, key,
               ciphertext, plaintext, spi_ctx_tmpl);
   
           if (error != CRYPTO_SUCCESS && IS_RECOVERABLE(error)) {
                   /* Add pd to the linked list of providers tried. */
                   if (kcf_insert_triedlist(&list, pd, KM_SLEEP) != NULL)
                           goto retry;
           }
   
           if (list != NULL)
                   kcf_free_triedlist(list);
   
           KCF_PROV_REFRELE(pd);
           return (error);
   }
   
   #if defined(_KERNEL)
   EXPORT_SYMBOL(crypto_encrypt);
   EXPORT_SYMBOL(crypto_decrypt);
   #endif

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