crypto/openssl-0.9/crypto/evp/e_des.c

   1 /* crypto/evp/e_des.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include "cryptlib.h"
  61 #ifndef OPENSSL_NO_DES
  62 #include <openssl/evp.h>
  63 #include <openssl/objects.h>
  64 #include "evp_locl.h"
  65 #include <openssl/des.h>
  66 #include <openssl/rand.h>
  67
  68 static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  69                         const unsigned char *iv, int enc);
  70 static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
  71
  72 /* Because of various casts and different names can't use IMPLEMENT_BLOCK_CIPHER */
  73
  74 static int des_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  75                           const unsigned char *in, unsigned int inl)
  76 {
  77         BLOCK_CIPHER_ecb_loop()
  78                 DES_ecb_encrypt((DES_cblock *)(in + i), (DES_cblock *)(out + i), ctx->cipher_data, ctx->encrypt);
  79         return 1;
  80 }
  81
  82 static int des_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  83                           const unsigned char *in, unsigned int inl)
  84 {
  85         DES_ofb64_encrypt(in, out, (long)inl, ctx->cipher_data, (DES_cblock *)ctx->iv, &ctx->num);
  86         return 1;
  87 }
  88
  89 static int des_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  90                           const unsigned char *in, unsigned int inl)
  91 {
  92         DES_ncbc_encrypt(in, out, (long)inl, ctx->cipher_data,
  93                          (DES_cblock *)ctx->iv, ctx->encrypt);
  94         return 1;
  95 }
  96
  97 static int des_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  98                             const unsigned char *in, unsigned int inl)
  99 {
 100         DES_cfb64_encrypt(in, out, (long)inl, ctx->cipher_data,
 101                           (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);
 102         return 1;
 103 }
 104
 105 /* Although we have a CFB-r implementation for DES, it doesn't pack the right
 106    way, so wrap it here */
 107 static int des_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 108                            const unsigned char *in, unsigned int inl)
 109     {
 110     unsigned int n;
 111     unsigned char c[1],d[1];
 112
 113     for(n=0 ; n < inl ; ++n)
 114         {
 115         c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0;
 116         DES_cfb_encrypt(c,d,1,1,ctx->cipher_data,(DES_cblock *)ctx->iv,
 117                         ctx->encrypt);
 118         out[n/8]=(out[n/8]&~(0x80 >> (n%8)))|((d[0]&0x80) >> (n%8));
 119         }
 120     return 1;
 121     }
 122
 123 static int des_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 124                            const unsigned char *in, unsigned int inl)
 125     {
 126     DES_cfb_encrypt(in,out,8,inl,ctx->cipher_data,(DES_cblock *)ctx->iv,
 127                     ctx->encrypt);
 128     return 1;
 129     }
 130
 131 BLOCK_CIPHER_defs(des, DES_key_schedule, NID_des, 8, 8, 8, 64,
 132                         EVP_CIPH_RAND_KEY, des_init_key, NULL,
 133                         EVP_CIPHER_set_asn1_iv,
 134                         EVP_CIPHER_get_asn1_iv,
 135                         des_ctrl)
 136
 137 BLOCK_CIPHER_def_cfb(des,DES_key_schedule,NID_des,8,8,1,
 138                      EVP_CIPH_RAND_KEY, des_init_key,NULL,
 139                      EVP_CIPHER_set_asn1_iv,
 140                      EVP_CIPHER_get_asn1_iv,des_ctrl)
 141
 142 BLOCK_CIPHER_def_cfb(des,DES_key_schedule,NID_des,8,8,8,
 143                      EVP_CIPH_RAND_KEY,des_init_key,NULL,
 144                      EVP_CIPHER_set_asn1_iv,
 145                      EVP_CIPHER_get_asn1_iv,des_ctrl)
 146
 147 static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 148                         const unsigned char *iv, int enc)
 149         {
 150         DES_cblock *deskey = (DES_cblock *)key;
 151 #ifdef EVP_CHECK_DES_KEY
 152         if(DES_set_key_checked(deskey,ctx->cipher_data) != 0)
 153                 return 0;
 154 #else
 155         DES_set_key_unchecked(deskey,ctx->cipher_data);
 156 #endif
 157         return 1;
 158         }
 159
 160 static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
 161         {
 162
 163         switch(type)
 164                 {
 165         case EVP_CTRL_RAND_KEY:
 166                 if (RAND_bytes(ptr, 8) <= 0)
 167                         return 0;
 168                 DES_set_odd_parity((DES_cblock *)ptr);
 169                 return 1;
 170
 171         default:
 172                 return -1;
 173                 }
 174         }
 175
 176 #endif