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1 | /* | |
2 | * Copyright 1995-2020 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 | ||
26 | static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, | |
27 | const unsigned char *iv, int enc); | |
28 | static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, | |
29 | const unsigned char *in, size_t inl); | |
30 | ||
31 | typedef struct { | |
32 | DES_key_schedule ks; /* key schedule */ | |
33 | DES_cblock inw; | |
34 | DES_cblock outw; | |
35 | } DESX_CBC_KEY; | |
36 | ||
37 | # define data(ctx) EVP_C_DATA(DESX_CBC_KEY,ctx) | |
38 | ||
39 | static const EVP_CIPHER d_xcbc_cipher = { | |
40 | NID_desx_cbc, | |
41 | 8, 24, 8, | |
42 | EVP_CIPH_CBC_MODE, | |
43 | desx_cbc_init_key, | |
44 | desx_cbc_cipher, | |
45 | NULL, | |
46 | sizeof(DESX_CBC_KEY), | |
47 | EVP_CIPHER_set_asn1_iv, | |
48 | EVP_CIPHER_get_asn1_iv, | |
49 | NULL, | |
50 | NULL | |
51 | }; | |
52 | ||
53 | const EVP_CIPHER *EVP_desx_cbc(void) | |
54 | { | |
55 | return &d_xcbc_cipher; | |
56 | } | |
57 | ||
58 | static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, | |
59 | const unsigned char *iv, int enc) | |
60 | { | |
61 | DES_cblock *deskey = (DES_cblock *)key; | |
62 | ||
63 | DES_set_key_unchecked(deskey, &data(ctx)->ks); | |
64 | memcpy(&data(ctx)->inw[0], &key[8], 8); | |
65 | memcpy(&data(ctx)->outw[0], &key[16], 8); | |
66 | ||
67 | return 1; | |
68 | } | |
69 | ||
70 | static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, | |
71 | const unsigned char *in, size_t inl) | |
72 | { | |
73 | while (inl >= EVP_MAXCHUNK) { | |
74 | DES_xcbc_encrypt(in, out, (long)EVP_MAXCHUNK, &data(ctx)->ks, | |
75 | (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx), | |
76 | &data(ctx)->inw, &data(ctx)->outw, | |
77 | EVP_CIPHER_CTX_encrypting(ctx)); | |
78 | inl -= EVP_MAXCHUNK; | |
79 | in += EVP_MAXCHUNK; | |
80 | out += EVP_MAXCHUNK; | |
81 | } | |
82 | if (inl) | |
83 | DES_xcbc_encrypt(in, out, (long)inl, &data(ctx)->ks, | |
84 | (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx), | |
85 | &data(ctx)->inw, &data(ctx)->outw, | |
86 | EVP_CIPHER_CTX_encrypting(ctx)); | |
87 | return 1; | |
88 | } | |
89 | #endif |