1 /*
2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
3  *
4  * Licensed under the OpenSSL license (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 
idea_ecb_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t inl)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 
BLOCK_CIPHER_func_cbc(idea,IDEA,EVP_IDEA_KEY,ks)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
71