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 "des_local.h"
17
18 /* RSA's DESX */
19
DES_xcbc_encrypt(const unsigned char * in,unsigned char * out,long length,DES_key_schedule * schedule,DES_cblock * ivec,const_DES_cblock * inw,const_DES_cblock * outw,int enc)20 void DES_xcbc_encrypt(const unsigned char *in, unsigned char *out,
21 long length, DES_key_schedule *schedule,
22 DES_cblock *ivec, const_DES_cblock *inw,
23 const_DES_cblock *outw, int enc)
24 {
25 register DES_LONG tin0, tin1;
26 register DES_LONG tout0, tout1, xor0, xor1;
27 register DES_LONG inW0, inW1, outW0, outW1;
28 register const unsigned char *in2;
29 register long l = length;
30 DES_LONG tin[2];
31 unsigned char *iv;
32
33 in2 = &(*inw)[0];
34 c2l(in2, inW0);
35 c2l(in2, inW1);
36 in2 = &(*outw)[0];
37 c2l(in2, outW0);
38 c2l(in2, outW1);
39
40 iv = &(*ivec)[0];
41
42 if (enc) {
43 c2l(iv, tout0);
44 c2l(iv, tout1);
45 for (l -= 8; l >= 0; l -= 8) {
46 c2l(in, tin0);
47 c2l(in, tin1);
48 tin0 ^= tout0 ^ inW0;
49 tin[0] = tin0;
50 tin1 ^= tout1 ^ inW1;
51 tin[1] = tin1;
52 DES_encrypt1(tin, schedule, DES_ENCRYPT);
53 tout0 = tin[0] ^ outW0;
54 l2c(tout0, out);
55 tout1 = tin[1] ^ outW1;
56 l2c(tout1, out);
57 }
58 if (l != -8) {
59 c2ln(in, tin0, tin1, l + 8);
60 tin0 ^= tout0 ^ inW0;
61 tin[0] = tin0;
62 tin1 ^= tout1 ^ inW1;
63 tin[1] = tin1;
64 DES_encrypt1(tin, schedule, DES_ENCRYPT);
65 tout0 = tin[0] ^ outW0;
66 l2c(tout0, out);
67 tout1 = tin[1] ^ outW1;
68 l2c(tout1, out);
69 }
70 iv = &(*ivec)[0];
71 l2c(tout0, iv);
72 l2c(tout1, iv);
73 } else {
74 c2l(iv, xor0);
75 c2l(iv, xor1);
76 for (l -= 8; l > 0; l -= 8) {
77 c2l(in, tin0);
78 tin[0] = tin0 ^ outW0;
79 c2l(in, tin1);
80 tin[1] = tin1 ^ outW1;
81 DES_encrypt1(tin, schedule, DES_DECRYPT);
82 tout0 = tin[0] ^ xor0 ^ inW0;
83 tout1 = tin[1] ^ xor1 ^ inW1;
84 l2c(tout0, out);
85 l2c(tout1, out);
86 xor0 = tin0;
87 xor1 = tin1;
88 }
89 if (l != -8) {
90 c2l(in, tin0);
91 tin[0] = tin0 ^ outW0;
92 c2l(in, tin1);
93 tin[1] = tin1 ^ outW1;
94 DES_encrypt1(tin, schedule, DES_DECRYPT);
95 tout0 = tin[0] ^ xor0 ^ inW0;
96 tout1 = tin[1] ^ xor1 ^ inW1;
97 l2cn(tout0, tout1, out, l + 8);
98 xor0 = tin0;
99 xor1 = tin1;
100 }
101
102 iv = &(*ivec)[0];
103 l2c(xor0, iv);
104 l2c(xor1, iv);
105 }
106 tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
107 inW0 = inW1 = outW0 = outW1 = 0;
108 tin[0] = tin[1] = 0;
109 }
110