The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*      $OpenBSD: xform.c,v 1.16 2001/08/28 12:20:43 ben Exp $  */
    2 /*-
    3  * The authors of this code are John Ioannidis (ji@tla.org),
    4  * Angelos D. Keromytis (kermit@csd.uch.gr),
    5  * Niels Provos (provos@physnet.uni-hamburg.de) and
    6  * Damien Miller (djm@mindrot.org).
    7  *
    8  * This code was written by John Ioannidis for BSD/OS in Athens, Greece,
    9  * in November 1995.
   10  *
   11  * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
   12  * by Angelos D. Keromytis.
   13  *
   14  * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
   15  * and Niels Provos.
   16  *
   17  * Additional features in 1999 by Angelos D. Keromytis.
   18  *
   19  * AES XTS implementation in 2008 by Damien Miller
   20  *
   21  * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
   22  * Angelos D. Keromytis and Niels Provos.
   23  *
   24  * Copyright (C) 2001, Angelos D. Keromytis.
   25  *
   26  * Copyright (C) 2008, Damien Miller
   27  * Copyright (c) 2014 The FreeBSD Foundation
   28  * All rights reserved.
   29  *
   30  * Portions of this software were developed by John-Mark Gurney
   31  * under sponsorship of the FreeBSD Foundation and
   32  * Rubicon Communications, LLC (Netgate).
   33  *
   34  * Permission to use, copy, and modify this software with or without fee
   35  * is hereby granted, provided that this entire notice is included in
   36  * all copies of any software which is or includes a copy or
   37  * modification of this software.
   38  * You may use this code under the GNU public license if you so wish. Please
   39  * contribute changes back to the authors under this freer than GPL license
   40  * so that we may further the use of strong encryption without limitations to
   41  * all.
   42  *
   43  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
   44  * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
   45  * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
   46  * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
   47  * PURPOSE.
   48  */
   49 
   50 #include <sys/cdefs.h>
   51 __FBSDID("$FreeBSD$");
   52 
   53 #include <opencrypto/skipjack.h>
   54 #include <opencrypto/xform_enc.h>
   55 
   56 static  int skipjack_setkey(u_int8_t **, u_int8_t *, int);
   57 static  void skipjack_encrypt(caddr_t, u_int8_t *);
   58 static  void skipjack_decrypt(caddr_t, u_int8_t *);
   59 static  void skipjack_zerokey(u_int8_t **);
   60 
   61 /* Encryption instances */
   62 struct enc_xform enc_xform_skipjack = {
   63         CRYPTO_SKIPJACK_CBC, "Skipjack",
   64         SKIPJACK_BLOCK_LEN, SKIPJACK_BLOCK_LEN, SKIPJACK_MIN_KEY,
   65         SKIPJACK_MAX_KEY,
   66         skipjack_encrypt,
   67         skipjack_decrypt, skipjack_setkey,
   68         skipjack_zerokey,
   69         NULL,
   70 };
   71 
   72 /*
   73  * Encryption wrapper routines.
   74  */
   75 static void
   76 skipjack_encrypt(caddr_t key, u_int8_t *blk)
   77 {
   78         skipjack_forwards(blk, blk, (u_int8_t **) key);
   79 }
   80 
   81 static void
   82 skipjack_decrypt(caddr_t key, u_int8_t *blk)
   83 {
   84         skipjack_backwards(blk, blk, (u_int8_t **) key);
   85 }
   86 
   87 static int
   88 skipjack_setkey(u_int8_t **sched, u_int8_t *key, int len)
   89 {
   90         int err;
   91 
   92         /* NB: allocate all the memory that's needed at once */
   93         *sched = KMALLOC(10 * (sizeof(u_int8_t *) + 0x100),
   94                 M_CRYPTO_DATA, M_NOWAIT|M_ZERO);
   95         if (*sched != NULL) {
   96                 u_int8_t** key_tables = (u_int8_t**) *sched;
   97                 u_int8_t* table = (u_int8_t*) &key_tables[10];
   98                 int k;
   99 
  100                 for (k = 0; k < 10; k++) {
  101                         key_tables[k] = table;
  102                         table += 0x100;
  103                 }
  104                 subkey_table_gen(key, (u_int8_t **) *sched);
  105                 err = 0;
  106         } else
  107                 err = ENOMEM;
  108         return err;
  109 }
  110 
  111 static void
  112 skipjack_zerokey(u_int8_t **sched)
  113 {
  114         bzero(*sched, 10 * (sizeof(u_int8_t *) + 0x100));
  115         KFREE(*sched, M_CRYPTO_DATA);
  116         *sched = NULL;
  117 }

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