crypto/evp/e_idea.c

   1 /*
   2  * Copyright 1995-2016 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 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12
  13 #ifndef OPENSSL_NO_IDEA
  14 # include <openssl/evp.h>
  15 # include <openssl/objects.h>
  16 # include "crypto/evp.h"
  17 # include <openssl/idea.h>
  18
  19 /* Can't use IMPLEMENT_BLOCK_CIPHER because IDEA_ecb_encrypt is different */
  20
  21 typedef struct {
  22     IDEA_KEY_SCHEDULE ks;
  23 } EVP_IDEA_KEY;
  24
  25 static int idea_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  26                          const unsigned char *iv, int enc);
  27
  28 /*
  29  * NB IDEA_ecb_encrypt doesn't take an 'encrypt' argument so we treat it as a
  30  * special case
  31  */
  32
  33 static int idea_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  34                            const unsigned char *in, size_t inl)
  35 {
  36     BLOCK_CIPHER_ecb_loop()
  37         IDEA_ecb_encrypt(in + i, out + i, &EVP_C_DATA(EVP_IDEA_KEY,ctx)->ks);
  38     return 1;
  39 }
  40
  41 BLOCK_CIPHER_func_cbc(idea, IDEA, EVP_IDEA_KEY, ks)
  42 BLOCK_CIPHER_func_ofb(idea, IDEA, 64, EVP_IDEA_KEY, ks)
  43 BLOCK_CIPHER_func_cfb(idea, IDEA, 64, EVP_IDEA_KEY, ks)
  44
  45 BLOCK_CIPHER_defs(idea, IDEA_KEY_SCHEDULE, NID_idea, 8, 16, 8, 64,
  46                   0, idea_init_key, NULL,
  47                   EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, NULL)
  48
  49 static int idea_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  50                          const unsigned char *iv, int enc)
  51 {
  52     if (!enc) {
  53         if (EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_OFB_MODE)
  54             enc = 1;
  55         else if (EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_CFB_MODE)
  56             enc = 1;
  57     }
  58     if (enc)
  59         IDEA_set_encrypt_key(key, &EVP_C_DATA(EVP_IDEA_KEY,ctx)->ks);
  60     else {
  61         IDEA_KEY_SCHEDULE tmp;
  62
  63         IDEA_set_encrypt_key(key, &tmp);
  64         IDEA_set_decrypt_key(&tmp, &EVP_C_DATA(EVP_IDEA_KEY,ctx)->ks);
  65         OPENSSL_cleanse((unsigned char *)&tmp, sizeof(IDEA_KEY_SCHEDULE));
  66     }
  67     return 1;
  68 }
  69
  70 #endif