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 * DES low level APIs are deprecated for public use, but still ok for internal
12 * use.
13 */
14#include "internal/deprecated.h"
15
16#include <stdio.h>
17#include "internal/cryptlib.h"
18
19#ifndef OPENSSL_NO_DES
20
21# include <openssl/evp.h>
22# include <openssl/objects.h>
23# include "crypto/evp.h"
24# include <openssl/des.h>
25# include "evp_local.h"
26
27static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
28                             const unsigned char *iv, int enc);
29static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
30                           const unsigned char *in, size_t inl);
31
32typedef struct {
33    DES_key_schedule ks;        /* key schedule */
34    DES_cblock inw;
35    DES_cblock outw;
36} DESX_CBC_KEY;
37
38# define data(ctx) EVP_C_DATA(DESX_CBC_KEY,ctx)
39
40static const EVP_CIPHER d_xcbc_cipher = {
41    NID_desx_cbc,
42    8, 24, 8,
43    EVP_CIPH_CBC_MODE,
44    EVP_ORIG_GLOBAL,
45    desx_cbc_init_key,
46    desx_cbc_cipher,
47    NULL,
48    sizeof(DESX_CBC_KEY),
49    EVP_CIPHER_set_asn1_iv,
50    EVP_CIPHER_get_asn1_iv,
51    NULL,
52    NULL
53};
54
55const EVP_CIPHER *EVP_desx_cbc(void)
56{
57    return &d_xcbc_cipher;
58}
59
60static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
61                             const unsigned char *iv, int enc)
62{
63    DES_cblock *deskey = (DES_cblock *)key;
64
65    DES_set_key_unchecked(deskey, &data(ctx)->ks);
66    memcpy(&data(ctx)->inw[0], &key[8], 8);
67    memcpy(&data(ctx)->outw[0], &key[16], 8);
68
69    return 1;
70}
71
72static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
73                           const unsigned char *in, size_t inl)
74{
75    while (inl >= EVP_MAXCHUNK) {
76        DES_xcbc_encrypt(in, out, (long)EVP_MAXCHUNK, &data(ctx)->ks,
77                         (DES_cblock *)ctx->iv,
78                         &data(ctx)->inw, &data(ctx)->outw,
79                         EVP_CIPHER_CTX_is_encrypting(ctx));
80        inl -= EVP_MAXCHUNK;
81        in += EVP_MAXCHUNK;
82        out += EVP_MAXCHUNK;
83    }
84    if (inl)
85        DES_xcbc_encrypt(in, out, (long)inl, &data(ctx)->ks,
86                         (DES_cblock *)ctx->iv,
87                         &data(ctx)->inw, &data(ctx)->outw,
88                         EVP_CIPHER_CTX_is_encrypting(ctx));
89    return 1;
90}
91#endif
92