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      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
     79