crypto/evp/e_idea.c

   1 /*
   2  * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /*
  11  * IDEA low level APIs are deprecated for public use, but still ok for internal
  12  * use where we're using them to implement the higher level EVP interface, as is
  13  * the case here.
  14  */
  15 #include "internal/deprecated.h"
  16
  17 #include <stdio.h>
  18 #include "internal/cryptlib.h"
  19
  20 #ifndef OPENSSL_NO_IDEA
  21 # include <openssl/evp.h>
  22 # include <openssl/objects.h>
  23 # include "crypto/evp.h"
  24 # include <openssl/idea.h>
  25 # include "evp_local.h"
  26
  27 /* Can't use IMPLEMENT_BLOCK_CIPHER because IDEA_ecb_encrypt is different */
  28
  29 typedef struct {
  30     IDEA_KEY_SCHEDULE ks;
  31 } EVP_IDEA_KEY;
  32
  33 static int idea_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  34                          const unsigned char *iv, int enc);
  35
  36 /*
  37  * NB IDEA_ecb_encrypt doesn't take an 'encrypt' argument so we treat it as a
  38  * special case
  39  */
  40
  41 static int idea_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  42                            const unsigned char *in, size_t inl)
  43 {
  44     BLOCK_CIPHER_ecb_loop()
  45         IDEA_ecb_encrypt(in + i, out + i, &EVP_C_DATA(EVP_IDEA_KEY, ctx)->ks);
  46     return 1;
  47 }
  48
  49 BLOCK_CIPHER_func_cbc(idea, IDEA, EVP_IDEA_KEY, ks)
  50 BLOCK_CIPHER_func_ofb(idea, IDEA, 64, EVP_IDEA_KEY, ks)
  51 BLOCK_CIPHER_func_cfb(idea, IDEA, 64, EVP_IDEA_KEY, ks)
  52
  53 BLOCK_CIPHER_defs(idea, IDEA_KEY_SCHEDULE, NID_idea, 8, 16, 8, 64,
  54                   0, idea_init_key, NULL,
  55                   EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, NULL)
  56
  57 static int idea_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  58                          const unsigned char *iv, int enc)
  59 {
  60     if (!enc) {
  61         if (EVP_CIPHER_CTX_get_mode(ctx) == EVP_CIPH_OFB_MODE)
  62             enc = 1;
  63         else if (EVP_CIPHER_CTX_get_mode(ctx) == EVP_CIPH_CFB_MODE)
  64             enc = 1;
  65     }
  66     if (enc)
  67         IDEA_set_encrypt_key(key, &EVP_C_DATA(EVP_IDEA_KEY, ctx)->ks);
  68     else {
  69         IDEA_KEY_SCHEDULE tmp;
  70
  71         IDEA_set_encrypt_key(key, &tmp);
  72         IDEA_set_decrypt_key(&tmp, &EVP_C_DATA(EVP_IDEA_KEY, ctx)->ks);
  73         OPENSSL_cleanse((unsigned char *)&tmp, sizeof(IDEA_KEY_SCHEDULE));
  74     }
  75     return 1;
  76 }
  77
  78 #endif