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
27 static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
28 const unsigned char *iv, int enc);
29 static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
30 const unsigned char *in, size_t inl);
31
32 typedef 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
40 static 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
EVP_desx_cbc(void)55 const EVP_CIPHER *EVP_desx_cbc(void)
56 {
57 return &d_xcbc_cipher;
58 }
59
desx_cbc_init_key(EVP_CIPHER_CTX * ctx,const unsigned char * key,const unsigned char * iv,int enc)60 static 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
desx_cbc_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t inl)72 static 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