crypto/evp/e_des.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 #include <stdio.h>
  59 #include "internal/cryptlib.h"
  60 #ifndef OPENSSL_NO_DES
  61 # include <openssl/evp.h>
  62 # include <openssl/objects.h>
  63 # include "internal/evp_int.h"
  64 # include <openssl/des.h>
  65 # include <openssl/rand.h>
  66
  67 typedef struct {
  68     union {
  69         double align;
  70         DES_key_schedule ks;
  71     } ks;
  72     union {
  73         void (*cbc) (const void *, void *, size_t, const void *, void *);
  74     } stream;
  75 } EVP_DES_KEY;
  76
  77 # if defined(AES_ASM) && (defined(__sparc) || defined(__sparc__))
  78 /* ---------^^^ this is not a typo, just a way to detect that
  79  * assembler support was in general requested... */
  80 #  include "sparc_arch.h"
  81
  82 extern unsigned int OPENSSL_sparcv9cap_P[];
  83
  84 #  define SPARC_DES_CAPABLE       (OPENSSL_sparcv9cap_P[1] & CFR_DES)
  85
  86 void des_t4_key_expand(const void *key, DES_key_schedule *ks);
  87 void des_t4_cbc_encrypt(const void *inp, void *out, size_t len,
  88                         DES_key_schedule *ks, unsigned char iv[8]);
  89 void des_t4_cbc_decrypt(const void *inp, void *out, size_t len,
  90                         DES_key_schedule *ks, unsigned char iv[8]);
  91 # endif
  92
  93 static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  94                         const unsigned char *iv, int enc);
  95 static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
  96
  97 /*
  98  * Because of various casts and different names can't use
  99  * IMPLEMENT_BLOCK_CIPHER
 100  */
 101
 102 static int des_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 103                           const unsigned char *in, size_t inl)
 104 {
 105     BLOCK_CIPHER_ecb_loop()
 106         DES_ecb_encrypt((DES_cblock *)(in + i), (DES_cblock *)(out + i),
 107                         EVP_CIPHER_CTX_cipher_data(ctx),
 108                         EVP_CIPHER_CTX_encrypting(ctx));
 109     return 1;
 110 }
 111
 112 static int des_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 113                           const unsigned char *in, size_t inl)
 114 {
 115     while (inl >= EVP_MAXCHUNK) {
 116         int num = EVP_CIPHER_CTX_num(ctx);
 117         DES_ofb64_encrypt(in, out, (long)EVP_MAXCHUNK,
 118                           EVP_CIPHER_CTX_cipher_data(ctx),
 119                           (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx), &num);
 120         EVP_CIPHER_CTX_set_num(ctx, num);
 121         inl -= EVP_MAXCHUNK;
 122         in += EVP_MAXCHUNK;
 123         out += EVP_MAXCHUNK;
 124     }
 125     if (inl) {
 126         int num = EVP_CIPHER_CTX_num(ctx);
 127         DES_ofb64_encrypt(in, out, (long)inl, EVP_CIPHER_CTX_cipher_data(ctx),
 128                           (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx), &num);
 129         EVP_CIPHER_CTX_set_num(ctx, num);
 130     }
 131     return 1;
 132 }
 133
 134 static int des_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 135                           const unsigned char *in, size_t inl)
 136 {
 137     EVP_DES_KEY *dat = (EVP_DES_KEY *) EVP_CIPHER_CTX_cipher_data(ctx);
 138
 139     if (dat->stream.cbc) {
 140         (*dat->stream.cbc) (in, out, inl, &dat->ks.ks, EVP_CIPHER_CTX_iv_noconst(ctx));
 141         return 1;
 142     }
 143     while (inl >= EVP_MAXCHUNK) {
 144         DES_ncbc_encrypt(in, out, (long)EVP_MAXCHUNK, EVP_CIPHER_CTX_cipher_data(ctx),
 145                          (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx), EVP_CIPHER_CTX_encrypting(ctx));
 146         inl -= EVP_MAXCHUNK;
 147         in += EVP_MAXCHUNK;
 148         out += EVP_MAXCHUNK;
 149     }
 150     if (inl)
 151         DES_ncbc_encrypt(in, out, (long)inl, EVP_CIPHER_CTX_cipher_data(ctx),
 152                          (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx), EVP_CIPHER_CTX_encrypting(ctx));
 153     return 1;
 154 }
 155
 156 static int des_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 157                             const unsigned char *in, size_t inl)
 158 {
 159     while (inl >= EVP_MAXCHUNK) {
 160         int num = EVP_CIPHER_CTX_num(ctx);
 161         DES_cfb64_encrypt(in, out, (long)EVP_MAXCHUNK,
 162                           EVP_CIPHER_CTX_cipher_data(ctx),
 163                           (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx), &num,
 164                           EVP_CIPHER_CTX_encrypting(ctx));
 165         EVP_CIPHER_CTX_set_num(ctx, num);
 166         inl -= EVP_MAXCHUNK;
 167         in += EVP_MAXCHUNK;
 168         out += EVP_MAXCHUNK;
 169     }
 170     if (inl) {
 171         int num = EVP_CIPHER_CTX_num(ctx);
 172         DES_cfb64_encrypt(in, out, (long)inl, EVP_CIPHER_CTX_cipher_data(ctx),
 173                           (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx), &num,
 174                           EVP_CIPHER_CTX_encrypting(ctx));
 175         EVP_CIPHER_CTX_set_num(ctx, num);
 176     }
 177     return 1;
 178 }
 179
 180 /*
 181  * Although we have a CFB-r implementation for DES, it doesn't pack the right
 182  * way, so wrap it here
 183  */
 184 static int des_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 185                            const unsigned char *in, size_t inl)
 186 {
 187     size_t n, chunk = EVP_MAXCHUNK / 8;
 188     unsigned char c[1], d[1];
 189
 190     if (inl < chunk)
 191         chunk = inl;
 192
 193     while (inl && inl >= chunk) {
 194         for (n = 0; n < chunk * 8; ++n) {
 195             c[0] = (in[n / 8] & (1 << (7 - n % 8))) ? 0x80 : 0;
 196             DES_cfb_encrypt(c, d, 1, 1, EVP_CIPHER_CTX_cipher_data(ctx),
 197                             (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx), EVP_CIPHER_CTX_encrypting(ctx));
 198             out[n / 8] =
 199                 (out[n / 8] & ~(0x80 >> (unsigned int)(n % 8))) |
 200                 ((d[0] & 0x80) >> (unsigned int)(n % 8));
 201         }
 202         inl -= chunk;
 203         in += chunk;
 204         out += chunk;
 205         if (inl < chunk)
 206             chunk = inl;
 207     }
 208
 209     return 1;
 210 }
 211
 212 static int des_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 213                            const unsigned char *in, size_t inl)
 214 {
 215     while (inl >= EVP_MAXCHUNK) {
 216         DES_cfb_encrypt(in, out, 8, (long)EVP_MAXCHUNK, EVP_CIPHER_CTX_cipher_data(ctx),
 217                         (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx), EVP_CIPHER_CTX_encrypting(ctx));
 218         inl -= EVP_MAXCHUNK;
 219         in += EVP_MAXCHUNK;
 220         out += EVP_MAXCHUNK;
 221     }
 222     if (inl)
 223         DES_cfb_encrypt(in, out, 8, (long)inl, EVP_CIPHER_CTX_cipher_data(ctx),
 224                         (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx), EVP_CIPHER_CTX_encrypting(ctx));
 225     return 1;
 226 }
 227
 228 BLOCK_CIPHER_defs(des, EVP_DES_KEY, NID_des, 8, 8, 8, 64,
 229                   EVP_CIPH_RAND_KEY, des_init_key, NULL,
 230                   EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, des_ctrl)
 231
 232     BLOCK_CIPHER_def_cfb(des, EVP_DES_KEY, NID_des, 8, 8, 1,
 233                      EVP_CIPH_RAND_KEY, des_init_key, NULL,
 234                      EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, des_ctrl)
 235
 236     BLOCK_CIPHER_def_cfb(des, EVP_DES_KEY, NID_des, 8, 8, 8,
 237                      EVP_CIPH_RAND_KEY, des_init_key, NULL,
 238                      EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, des_ctrl)
 239
 240 static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 241                         const unsigned char *iv, int enc)
 242 {
 243     DES_cblock *deskey = (DES_cblock *)key;
 244     EVP_DES_KEY *dat = (EVP_DES_KEY *) EVP_CIPHER_CTX_cipher_data(ctx);
 245
 246     dat->stream.cbc = NULL;
 247 # if defined(SPARC_DES_CAPABLE)
 248     if (SPARC_DES_CAPABLE) {
 249         int mode = EVP_CIPHER_CTX_mode(ctx);
 250
 251         if (mode == EVP_CIPH_CBC_MODE) {
 252             des_t4_key_expand(key, &dat->ks.ks);
 253             dat->stream.cbc = enc ? des_t4_cbc_encrypt : des_t4_cbc_decrypt;
 254             return 1;
 255         }
 256     }
 257 # endif
 258     DES_set_key_unchecked(deskey, EVP_CIPHER_CTX_cipher_data(ctx));
 259     return 1;
 260 }
 261
 262 static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
 263 {
 264
 265     switch (type) {
 266     case EVP_CTRL_RAND_KEY:
 267         if (RAND_bytes(ptr, 8) <= 0)
 268             return 0;
 269         DES_set_odd_parity((DES_cblock *)ptr);
 270         return 1;
 271
 272     default:
 273         return -1;
 274     }
 275 }
 276
 277 #endif