FreeBSD/Linux Kernel Cross Reference
sys/opencrypto/xform_null.c

     /*      $OpenBSD: xform.c,v 1.16 2001/08/28 12:20:43 ben Exp $  */
     /*-
      * The authors of this code are John Ioannidis (ji@tla.org),
      * Angelos D. Keromytis (kermit@csd.uch.gr),
      * Niels Provos (provos@physnet.uni-hamburg.de) and
      * Damien Miller (djm@mindrot.org).
      *
      * This code was written by John Ioannidis for BSD/OS in Athens, Greece,
      * in November 1995.
     *
     * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
     * by Angelos D. Keromytis.
     *
     * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
     * and Niels Provos.
     *
     * Additional features in 1999 by Angelos D. Keromytis.
     *
     * AES XTS implementation in 2008 by Damien Miller
     *
     * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
     * Angelos D. Keromytis and Niels Provos.
     *
     * Copyright (C) 2001, Angelos D. Keromytis.
     *
     * Copyright (C) 2008, Damien Miller
     * Copyright (c) 2014 The FreeBSD Foundation
     * All rights reserved.
     *
     * Portions of this software were developed by John-Mark Gurney
     * under sponsorship of the FreeBSD Foundation and
     * Rubicon Communications, LLC (Netgate).
     *
     * Permission to use, copy, and modify this software with or without fee
     * is hereby granted, provided that this entire notice is included in
     * all copies of any software which is or includes a copy or
     * modification of this software.
     * You may use this code under the GNU public license if you so wish. Please
     * contribute changes back to the authors under this freer than GPL license
     * so that we may further the use of strong encryption without limitations to
     * all.
     *
     * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
     * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
     * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
     * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
     * PURPOSE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <opencrypto/xform_auth.h>
    #include <opencrypto/xform_enc.h>
    
    static  int null_setkey(void *, const uint8_t *, int);
    static  void null_crypt(void *, const uint8_t *, uint8_t *);
    static  void null_crypt_multi(void *, const uint8_t *, uint8_t *, size_t);
    
    static  void null_init(void *);
    static  void null_reinit(void *ctx, const uint8_t *buf, u_int len);
    static  int null_update(void *, const void *, u_int);
    static  void null_final(uint8_t *, void *);
    
    /* Encryption instances */
    const struct enc_xform enc_xform_null = {
            .type = CRYPTO_NULL_CBC,
            .name = "NULL",
            /* NB: blocksize of 4 is to generate a properly aligned ESP header */
            .blocksize = NULL_BLOCK_LEN,
            .ivsize = 0,
            .minkey = NULL_MIN_KEY,
            .maxkey = NULL_MAX_KEY,
            .setkey = null_setkey,
            .encrypt = null_crypt,
            .decrypt = null_crypt,
            .encrypt_multi = null_crypt_multi,
            .decrypt_multi = null_crypt_multi,
    };
    
    /* Authentication instances */
    const struct auth_hash auth_hash_null = {
            .type = CRYPTO_NULL_HMAC,
            .name = "NULL-HMAC",
            .keysize = 0,
            .hashsize = NULL_HASH_LEN,
            .ctxsize = sizeof(int), /* NB: context isn't used */
            .blocksize = NULL_HMAC_BLOCK_LEN,
            .Init = null_init,
            .Setkey = null_reinit,
            .Reinit = null_reinit,
            .Update = null_update,
            .Final = null_final,
    };
    
    /*
     * Encryption wrapper routines.
     */
    static void
   null_crypt(void *key, const uint8_t *in, uint8_t *out)
   {
           if (in != out)
                   memcpy(out, in, NULL_BLOCK_LEN);
   }
   
   static void
   null_crypt_multi(void *key, const uint8_t *in, uint8_t *out, size_t len)
   {
           if (in != out)
                   memcpy(out, in, len);
   }
   
   static int
   null_setkey(void *sched, const uint8_t *key, int len)
   {
           return (0);
   }
   
   /*
    * And now for auth.
    */
   
   static void
   null_init(void *ctx)
   {
   }
   
   static void
   null_reinit(void *ctx, const uint8_t *buf, u_int len)
   {
   }
   
   static int
   null_update(void *ctx, const void *buf, u_int len)
   {
           return (0);
   }
   
   static void
   null_final(uint8_t *buf, void *ctx)
   {
           bzero(buf, NULL_HASH_LEN);
   }

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