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_DES
14
15# include <openssl/evp.h>
16# include <openssl/objects.h>
17# include "crypto/evp.h"
18# include <openssl/des.h>
19
20static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
21 const unsigned char *iv, int enc);
22static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
23 const unsigned char *in, size_t inl);
24
25typedef struct {
26 DES_key_schedule ks; /* key schedule */
27 DES_cblock inw;
28 DES_cblock outw;
29} DESX_CBC_KEY;
30
31# define data(ctx) EVP_C_DATA(DESX_CBC_KEY,ctx)
32
33static const EVP_CIPHER d_xcbc_cipher = {
34 NID_desx_cbc,
35 8, 24, 8,
36 EVP_CIPH_CBC_MODE,
37 desx_cbc_init_key,
38 desx_cbc_cipher,
39 NULL,
40 sizeof(DESX_CBC_KEY),
41 EVP_CIPHER_set_asn1_iv,
42 EVP_CIPHER_get_asn1_iv,
43 NULL,
44 NULL
45};
46
47const EVP_CIPHER *EVP_desx_cbc(void)
48{
49 return &d_xcbc_cipher;
50}
51
52static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
53 const unsigned char *iv, int enc)
54{
55 DES_cblock *deskey = (DES_cblock *)key;
56
57 DES_set_key_unchecked(deskey, &data(ctx)->ks);
58 memcpy(&data(ctx)->inw[0], &key[8], 8);
59 memcpy(&data(ctx)->outw[0], &key[16], 8);
60
61 return 1;
62}
63
64static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
65 const unsigned char *in, size_t inl)
66{
67 while (inl >= EVP_MAXCHUNK) {
68 DES_xcbc_encrypt(in, out, (long)EVP_MAXCHUNK, &data(ctx)->ks,
69 (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx),
70 &data(ctx)->inw, &data(ctx)->outw,
71 EVP_CIPHER_CTX_encrypting(ctx));
72 inl -= EVP_MAXCHUNK;
73 in += EVP_MAXCHUNK;
74 out += EVP_MAXCHUNK;
75 }
76 if (inl)
77 DES_xcbc_encrypt(in, out, (long)inl, &data(ctx)->ks,
78 (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx),
79 &data(ctx)->inw, &data(ctx)->outw,
80 EVP_CIPHER_CTX_encrypting(ctx));
81 return 1;
82}
83#endif
84