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
29typedef struct {
30    IDEA_KEY_SCHEDULE ks;
31} EVP_IDEA_KEY;
32
33static 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
41static 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
49BLOCK_CIPHER_func_cbc(idea, IDEA, EVP_IDEA_KEY, ks)
50BLOCK_CIPHER_func_ofb(idea, IDEA, 64, EVP_IDEA_KEY, ks)
51BLOCK_CIPHER_func_cfb(idea, IDEA, 64, EVP_IDEA_KEY, ks)
52
53BLOCK_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
57static 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