release/src/router/nettle/des-compat.h

   1 /* des-compat.h
   2  *
   3  * The des block cipher, libdes/openssl-style interface.
   4  */
   5
   6 /* nettle, low-level cryptographics library
   7  *
   8  * Copyright (C) 2001 Niels Möller
   9  *
  10  * The nettle library is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 of the License, or (at your
  13  * option) any later version.
  14  *
  15  * The nettle library is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  17  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  18  * License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with the nettle library; see the file COPYING.LIB.  If not, write to
  22  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  23  * MA 02111-1301, USA.
  24  */
  25
  26 #ifndef NETTLE_DES_COMPAT_H_INCLUDED
  27 #define NETTLE_DES_COMPAT_H_INCLUDED
  28
  29 /* According to Assar, des_set_key, des_set_key_odd_parity,
  30  * des_is_weak_key, plus the encryption functions (des_*_encrypt and
  31  * des_cbc_cksum) would be a pretty useful subset. */
  32
  33 /* NOTE: This is quite experimental, and not all functions are
  34  * implemented. Contributions, in particular test cases are welcome. */
  35
  36 #include "des.h"
  37
  38 #ifdef __cplusplus
  39 extern "C" {
  40 #endif
  41
  42 /* We use some name mangling, to avoid collisions with either other
  43  * nettle functions or with libcrypto. */
  44
  45 #define des_ecb3_encrypt nettle_openssl_des_ecb3_encrypt
  46 #define des_cbc_cksum nettle_openssl_des_cbc_cksum
  47 #define des_ncbc_encrypt nettle_openssl_des_ncbc_encrypt
  48 #define des_cbc_encrypt nettle_openssl_des_cbc_encrypt
  49 #define des_ecb_encrypt nettle_openssl_des_ecb_encrypt
  50 #define des_ede3_cbc_encrypt nettle_openssl_des_ede3_cbc_encrypt
  51 #define des_set_odd_parity nettle_openssl_des_set_odd_parity
  52 #define des_check_key nettle_openssl_des_check_key
  53 #define des_key_sched nettle_openssl_des_key_sched
  54 #define des_is_weak_key nettle_openssl_des_is_weak_key
  55
  56 /* An extra alias */
  57 #undef des_set_key
  58 #define des_set_key nettle_openssl_des_key_sched
  59
  60 enum { DES_DECRYPT = 0, DES_ENCRYPT = 1 };
  61
  62 /* Types */
  63 typedef uint32_t DES_LONG;
  64
  65 /* Note: Typedef:ed arrays should be avoided, but they're used here
  66  * for compatibility. */
  67 typedef struct des_ctx des_key_schedule[1];
  68
  69 typedef uint8_t des_cblock[DES_BLOCK_SIZE];
  70 /* Note: The proper definition,
  71
  72      typedef const uint8_t const_des_cblock[DES_BLOCK_SIZE];
  73
  74    would have worked, *if* all the prototypes had used arguments like
  75    foo(const_des_cblock src, des_cblock dst), letting argument arrays
  76    "decay" into pointers of type uint8_t * and const uint8_t *.
  77
  78    But since openssl's prototypes use *pointers* const_des_cblock *src,
  79    des_cblock *dst, this ends up in type conflicts, and the workaround
  80    is to not use const at all.
  81 */
  82 #define const_des_cblock des_cblock
  83
  84 /* Aliases */
  85 #define des_ecb2_encrypt(i,o,k1,k2,e) \
  86         des_ecb3_encrypt((i),(o),(k1),(k2),(k1),(e))
  87
  88 #define des_ede2_cbc_encrypt(i,o,l,k1,k2,iv,e) \
  89         des_ede3_cbc_encrypt((i),(o),(l),(k1),(k2),(k1),(iv),(e))
  90
  91 /* Global flag */
  92 extern int des_check_key;
  93
  94 /* Prototypes */
  95
  96 /* Typing is a little confusing. Since both des_cblock and
  97    des_key_schedule are typedef:ed arrays, it automatically decay to
  98    a pointers.
  99
 100    But the functions are declared taking pointers to des_cblock, i.e.
 101    pointers to arrays. And on the other hand, they take plain
 102    des_key_schedule arguments, which is equivalent to pointers to
 103    struct des_ctx.  */
 104 void
 105 des_ecb3_encrypt(const_des_cblock *src, des_cblock *dst,
 106                  des_key_schedule k1,
 107                  des_key_schedule k2,
 108                  des_key_schedule k3, int enc);
 109
 110 /* des_cbc_cksum in libdes returns a 32 bit integer, representing the
 111  * latter half of the output block, using little endian byte order. */
 112 uint32_t
 113 des_cbc_cksum(const uint8_t *src, des_cblock *dst,
 114               long length, des_key_schedule ctx,
 115               const_des_cblock *iv);
 116
 117 /* NOTE: Doesn't update iv. */
 118 void
 119 des_cbc_encrypt(const_des_cblock *src, des_cblock *dst, long length,
 120                 des_key_schedule ctx, const_des_cblock *iv,
 121                 int enc);
 122
 123 /* Similar, but updates iv. */
 124 void
 125 des_ncbc_encrypt(const_des_cblock *src, des_cblock *dst, long length,
 126                  des_key_schedule ctx, des_cblock *iv,
 127                  int enc);
 128
 129 void
 130 des_ecb_encrypt(const_des_cblock *src, des_cblock *dst,
 131                 des_key_schedule ctx, int enc);
 132
 133 void
 134 des_ede3_cbc_encrypt(const_des_cblock *src, des_cblock *dst, long length,
 135                      des_key_schedule k1,
 136                      des_key_schedule k2,
 137                      des_key_schedule k3,
 138                      des_cblock *iv,
 139                      int enc);
 140
 141 int
 142 des_set_odd_parity(des_cblock *key);
 143
 144 int
 145 des_key_sched(const_des_cblock *key, des_key_schedule ctx);
 146
 147 int
 148 des_is_weak_key(const_des_cblock *key);
 149
 150 #ifdef __cplusplus
 151 }
 152 #endif
 153
 154 #endif /* NETTLE_DES_COMPAT_H_INCLUDED */