e_idea.c revision 296465 
1/* crypto/evp/e_idea.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to.  The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 *    notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in the
30 *    documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 *    must display the following acknowledgement:
33 *    "This product includes cryptographic software written by
34 *     Eric Young (eay@cryptsoft.com)"
35 *    The word 'cryptographic' can be left out if the rouines from the library
36 *    being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 *    the apps directory (application code) you must include an acknowledgement:
39 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#include <stdio.h>
60#include "cryptlib.h"
61
62#ifndef OPENSSL_NO_IDEA
63# include <openssl/evp.h>
64# include <openssl/objects.h>
65# include "evp_locl.h"
66# include <openssl/idea.h>
67
68static int idea_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
69                         const unsigned char *iv, int enc);
70
71/*
72 * NB idea_ecb_encrypt doesn't take an 'encrypt' argument so we treat it as a
73 * special case
74 */
75
76static int idea_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
77                           const unsigned char *in, unsigned int inl)
78{
79    BLOCK_CIPHER_ecb_loop()
80        idea_ecb_encrypt(in + i, out + i, ctx->cipher_data);
81    return 1;
82}
83
84/* Can't use IMPLEMENT_BLOCK_CIPHER because idea_ecb_encrypt is different */
85
86typedef struct {
87    IDEA_KEY_SCHEDULE ks;
88} EVP_IDEA_KEY;
89
90BLOCK_CIPHER_func_cbc(idea, idea, EVP_IDEA_KEY, ks)
91    BLOCK_CIPHER_func_ofb(idea, idea, 64, EVP_IDEA_KEY, ks)
92    BLOCK_CIPHER_func_cfb(idea, idea, 64, EVP_IDEA_KEY, ks)
93
94    BLOCK_CIPHER_defs(idea, IDEA_KEY_SCHEDULE, NID_idea, 8, 16, 8, 64,
95                  0, idea_init_key, NULL,
96                  EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, NULL)
97
98static int idea_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
99                         const unsigned char *iv, int enc)
100{
101    if (!enc) {
102        if (EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_OFB_MODE)
103            enc = 1;
104        else if (EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_CFB_MODE)
105            enc = 1;
106    }
107    if (enc)
108        idea_set_encrypt_key(key, ctx->cipher_data);
109    else {
110        IDEA_KEY_SCHEDULE tmp;
111
112        idea_set_encrypt_key(key, &tmp);
113        idea_set_decrypt_key(&tmp, ctx->cipher_data);
114        OPENSSL_cleanse((unsigned char *)&tmp, sizeof(IDEA_KEY_SCHEDULE));
115    }
116    return 1;
117}
118
119#endif
120