xref: /freebsd/crypto/openssl/crypto/evp/e_xcbc_d.c (revision cddbc3b40812213ff00041f79174cac0be360a2a)
1 /*
2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
3  *
4  * Licensed under the OpenSSL license (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 "internal/evp_int.h"
18 # include <openssl/des.h>
19 
20 static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
21                              const unsigned char *iv, int enc);
22 static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
23                            const unsigned char *in, size_t inl);
24 
25 typedef 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 
33 static 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 
47 const EVP_CIPHER *EVP_desx_cbc(void)
48 {
49     return &d_xcbc_cipher;
50 }
51 
52 static 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 
64 static 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