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e_des.c
/* crypto/evp/e_des.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include "cryptlib.h"
#ifndef OPENSSL_NO_DES
#include <openssl/evp.h>
#include <openssl/objects.h>
#include "evp_locl.h"
#include <openssl/des.h>
#include <openssl/rand.h>

static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                  const unsigned char *iv, int enc);
static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);

/* Because of various casts and different names can't use IMPLEMENT_BLOCK_CIPHER */

static int des_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
                    const unsigned char *in, size_t inl)
{
      BLOCK_CIPHER_ecb_loop()
            DES_ecb_encrypt((DES_cblock *)(in + i), (DES_cblock *)(out + i), ctx->cipher_data, ctx->encrypt);
      return 1;
}

static int des_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
                    const unsigned char *in, size_t inl)
{
      while(inl>=EVP_MAXCHUNK)
            {
            DES_ofb64_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data,
                        (DES_cblock *)ctx->iv, &ctx->num);
            inl-=EVP_MAXCHUNK;
            in +=EVP_MAXCHUNK;
            out+=EVP_MAXCHUNK;
            }
      if (inl)
            DES_ofb64_encrypt(in, out, (long)inl, ctx->cipher_data,
                        (DES_cblock *)ctx->iv, &ctx->num);
      return 1;
}

static int des_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
                    const unsigned char *in, size_t inl)
{
      while(inl>=EVP_MAXCHUNK)
            {
            DES_ncbc_encrypt(in, out, (long)EVP_MAXCHUNK, ctx->cipher_data,
                        (DES_cblock *)ctx->iv, ctx->encrypt);
            inl-=EVP_MAXCHUNK;
            in +=EVP_MAXCHUNK;
            out+=EVP_MAXCHUNK;
            }
      if (inl)
            DES_ncbc_encrypt(in, out, (long)inl, ctx->cipher_data,
                        (DES_cblock *)ctx->iv, ctx->encrypt);
      return 1;
}

static int des_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
                      const unsigned char *in, size_t inl)
{
      while(inl>=EVP_MAXCHUNK)
            {
            DES_cfb64_encrypt(in,out, (long)EVP_MAXCHUNK, ctx->cipher_data,
                        (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);
            inl-=EVP_MAXCHUNK;
            in +=EVP_MAXCHUNK;
            out+=EVP_MAXCHUNK;
            }
      if (inl)
            DES_cfb64_encrypt(in, out, (long)inl, ctx->cipher_data,
                    (DES_cblock *)ctx->iv, &ctx->num, ctx->encrypt);
      return 1;
}

/* Although we have a CFB-r implementation for DES, it doesn't pack the right
   way, so wrap it here */
static int des_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
                     const unsigned char *in, size_t inl)
    {
    size_t n,chunk=EVP_MAXCHUNK/8;
    unsigned char c[1],d[1];

    if (inl<chunk) chunk=inl;

    while (inl && inl>=chunk)
      {
      for(n=0 ; n < chunk*8; ++n)
          {
          c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0;
          DES_cfb_encrypt(c,d,1,1,ctx->cipher_data,(DES_cblock *)ctx->iv,
                  ctx->encrypt);
          out[n/8]=(out[n/8]&~(0x80 >> (unsigned int)(n%8))) |
                 ((d[0]&0x80) >> (unsigned int)(n%8));
          }
      inl-=chunk;
      in +=chunk;
      out+=chunk;
      if (inl<chunk) chunk=inl;
      }

    return 1;
    }

static int des_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
                     const unsigned char *in, size_t inl)
    {
    while (inl>=EVP_MAXCHUNK)
      {
      DES_cfb_encrypt(in,out,8,(long)EVP_MAXCHUNK,ctx->cipher_data,
                  (DES_cblock *)ctx->iv,ctx->encrypt);
      inl-=EVP_MAXCHUNK;
      in +=EVP_MAXCHUNK;
      out+=EVP_MAXCHUNK;
      }
    if (inl)
      DES_cfb_encrypt(in,out,8,(long)inl,ctx->cipher_data,
                  (DES_cblock *)ctx->iv,ctx->encrypt);
    return 1;
    }

BLOCK_CIPHER_defs(des, DES_key_schedule, NID_des, 8, 8, 8, 64,
                  EVP_CIPH_RAND_KEY, des_init_key, NULL,
                  EVP_CIPHER_set_asn1_iv,
                  EVP_CIPHER_get_asn1_iv,
                  des_ctrl)

BLOCK_CIPHER_def_cfb(des,DES_key_schedule,NID_des,8,8,1,
                 EVP_CIPH_RAND_KEY, des_init_key,NULL,
                 EVP_CIPHER_set_asn1_iv,
                 EVP_CIPHER_get_asn1_iv,des_ctrl)

BLOCK_CIPHER_def_cfb(des,DES_key_schedule,NID_des,8,8,8,
                 EVP_CIPH_RAND_KEY,des_init_key,NULL,
                 EVP_CIPHER_set_asn1_iv,
                 EVP_CIPHER_get_asn1_iv,des_ctrl)

static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                  const unsigned char *iv, int enc)
      {
      DES_cblock *deskey = (DES_cblock *)key;
#ifdef EVP_CHECK_DES_KEY
      if(DES_set_key_checked(deskey,ctx->cipher_data) != 0)
            return 0;
#else
      DES_set_key_unchecked(deskey,ctx->cipher_data);
#endif
      return 1;
      }

static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
      {
      
      switch(type)
            {
      case EVP_CTRL_RAND_KEY:
            if (RAND_bytes(ptr, 8) <= 0)
                  return 0;
            DES_set_odd_parity((DES_cblock *)ptr);
            return 1;

      default:
            return -1;
            }
      }

#endif

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