xref: /openssl/crypto/evp/e_xcbc_d.c (revision ed576acd)
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