text: /* 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 "internal/cryptlib.h"
  
  #ifndef OPENSSL_NO_IDEA
  # include <openssl/evp.h>
  # include <openssl/objects.h>
  # include "internal/evp_int.h"
  # include <openssl/idea.h>
  
  /* Can't use IMPLEMENT_BLOCK_CIPHER because IDEA_ecb_encrypt is different */
  
  typedef struct {
      IDEA_KEY_SCHEDULE ks;
  } EVP_IDEA_KEY;
  
  static int idea_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                           const unsigned char *iv, int enc);
  
  /*
   * NB IDEA_ecb_encrypt doesn't take an 'encrypt' argument so we treat it as a
   * special case
   */
  
  static int idea_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
                             const unsigned char *in, size_t inl)
  {
      BLOCK_CIPHER_ecb_loop()
          IDEA_ecb_encrypt(in + i, out + i, &EVP_C_DATA(EVP_IDEA_KEY,ctx)->ks);
      return 1;
  }
  
  BLOCK_CIPHER_func_cbc(idea, IDEA, EVP_IDEA_KEY, ks)
  BLOCK_CIPHER_func_ofb(idea, IDEA, 64, EVP_IDEA_KEY, ks)
  BLOCK_CIPHER_func_cfb(idea, IDEA, 64, EVP_IDEA_KEY, ks)
  
  BLOCK_CIPHER_defs(idea, IDEA_KEY_SCHEDULE, NID_idea, 8, 16, 8, 64,
                    0, idea_init_key, NULL,
                    EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, NULL)
  
  static int idea_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                           const unsigned char *iv, int enc)
  {
      if (!enc) {
          if (EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_OFB_MODE)
              enc = 1;
          else if (EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_CFB_MODE)
              enc = 1;
      }
      if (enc)
          IDEA_set_encrypt_key(key, &EVP_C_DATA(EVP_IDEA_KEY,ctx)->ks);
      else {
          IDEA_KEY_SCHEDULE tmp;
  
          IDEA_set_encrypt_key(key, &tmp);
          IDEA_set_decrypt_key(&tmp, &EVP_C_DATA(EVP_IDEA_KEY,ctx)->ks);
          OPENSSL_cleanse((unsigned char *)&tmp, sizeof(IDEA_KEY_SCHEDULE));
      }
      return 1;
  }
  
  #endif
  