FreeBSD/Linux Kernel Cross Reference
sys/opencrypto/xform_des1.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: releng/11.1/sys/opencrypto/xform_des1.c 292963 2015-12-30 22:43:07Z allanjude $");
    
    #include <crypto/des/des.h>
    #include <opencrypto/xform_enc.h>
    
    static  int des1_setkey(u_int8_t **, u_int8_t *, int);
    static  void des1_encrypt(caddr_t, u_int8_t *);
    static  void des1_decrypt(caddr_t, u_int8_t *);
    static  void des1_zerokey(u_int8_t **);
    
    /* Encryption instances */
    struct enc_xform enc_xform_des = {
            CRYPTO_DES_CBC, "DES",
            DES_BLOCK_LEN, DES_BLOCK_LEN, DES_MIN_KEY, DES_MAX_KEY,
            des1_encrypt,
            des1_decrypt,
            des1_setkey,
            des1_zerokey,
            NULL,
    };
    
    /*
     * Encryption wrapper routines.
     */
    static void
    des1_encrypt(caddr_t key, u_int8_t *blk)
    {
            des_cblock *cb = (des_cblock *) blk;
            des_key_schedule *p = (des_key_schedule *) key;
    
            des_ecb_encrypt(cb, cb, p[0], DES_ENCRYPT);
    }
    
    static void
    des1_decrypt(caddr_t key, u_int8_t *blk)
    {
            des_cblock *cb = (des_cblock *) blk;
            des_key_schedule *p = (des_key_schedule *) key;
    
            des_ecb_encrypt(cb, cb, p[0], DES_DECRYPT);
    }
    
    static int
    des1_setkey(u_int8_t **sched, u_int8_t *key, int len)
    {
            des_key_schedule *p;
            int err;
    
            p = KMALLOC(sizeof (des_key_schedule),
                   M_CRYPTO_DATA, M_NOWAIT|M_ZERO);
           if (p != NULL) {
                   des_set_key((des_cblock *) key, p[0]);
                   err = 0;
           } else
                   err = ENOMEM;
           *sched = (u_int8_t *) p;
           return err;
   }
   
   static void
   des1_zerokey(u_int8_t **sched)
   {
           bzero(*sched, sizeof (des_key_schedule));
           KFREE(*sched, M_CRYPTO_DATA);
           *sched = NULL;
   }

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