crypto/evp/e_idea.c

   1 /* crypto/evp/e_idea.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 "internal/cryptlib.h"
  61
  62 #ifndef OPENSSL_NO_IDEA
  63 # include <openssl/evp.h>
  64 # include <openssl/objects.h>
  65 # include "internal/evp_int.h"
  66 # include <openssl/idea.h>
  67
  68 /* Can't use IMPLEMENT_BLOCK_CIPHER because idea_ecb_encrypt is different */
  69
  70 typedef struct {
  71     IDEA_KEY_SCHEDULE ks;
  72 } EVP_IDEA_KEY;
  73
  74 static int idea_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  75                          const unsigned char *iv, int enc);
  76
  77 /*
  78  * NB idea_ecb_encrypt doesn't take an 'encrypt' argument so we treat it as a
  79  * special case
  80  */
  81
  82 static int idea_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  83                            const unsigned char *in, size_t inl)
  84 {
  85     BLOCK_CIPHER_ecb_loop()
  86         idea_ecb_encrypt(in + i, out + i, &EVP_C_DATA(EVP_IDEA_KEY,ctx)->ks);
  87     return 1;
  88 }
  89
  90 BLOCK_CIPHER_func_cbc(idea, idea, EVP_IDEA_KEY, ks)
  91     BLOCK_CIPHER_func_ofb(idea, idea, 64, EVP_IDEA_KEY, ks)
  92     BLOCK_CIPHER_func_cfb(idea, idea, 64, EVP_IDEA_KEY, ks)
  93
  94     BLOCK_CIPHER_defs(idea, IDEA_KEY_SCHEDULE, NID_idea, 8, 16, 8, 64,
  95                   0, idea_init_key, NULL,
  96                   EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, NULL)
  97
  98 static int idea_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  99                          const unsigned char *iv, int enc)
 100 {
 101     if (!enc) {
 102         if (EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_OFB_MODE)
 103             enc = 1;
 104         else if (EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_CFB_MODE)
 105             enc = 1;
 106     }
 107     if (enc)
 108         idea_set_encrypt_key(key, &EVP_C_DATA(EVP_IDEA_KEY,ctx)->ks);
 109     else {
 110         IDEA_KEY_SCHEDULE tmp;
 111
 112         idea_set_encrypt_key(key, &tmp);
 113         idea_set_decrypt_key(&tmp, &EVP_C_DATA(EVP_IDEA_KEY,ctx)->ks);
 114         OPENSSL_cleanse((unsigned char *)&tmp, sizeof(IDEA_KEY_SCHEDULE));
 115     }
 116     return 1;
 117 }
 118
 119 #endif