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d2e9e320 RS |
1 | /* |
2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. | |
d02b48c6 | 3 | * |
d2e9e320 RS |
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 | |
d02b48c6 RE |
8 | */ |
9 | ||
10 | #include "des_locl.h" | |
11 | ||
12 | /* RSA's DESX */ | |
13 | ||
c2e4f17c | 14 | void DES_xcbc_encrypt(const unsigned char *in, unsigned char *out, |
0f113f3e MC |
15 | long length, DES_key_schedule *schedule, |
16 | DES_cblock *ivec, const_DES_cblock *inw, | |
17 | const_DES_cblock *outw, int enc) | |
18 | { | |
19 | register DES_LONG tin0, tin1; | |
20 | register DES_LONG tout0, tout1, xor0, xor1; | |
21 | register DES_LONG inW0, inW1, outW0, outW1; | |
22 | register const unsigned char *in2; | |
23 | register long l = length; | |
24 | DES_LONG tin[2]; | |
25 | unsigned char *iv; | |
d02b48c6 | 26 | |
0f113f3e MC |
27 | in2 = &(*inw)[0]; |
28 | c2l(in2, inW0); | |
29 | c2l(in2, inW1); | |
30 | in2 = &(*outw)[0]; | |
31 | c2l(in2, outW0); | |
32 | c2l(in2, outW1); | |
d02b48c6 | 33 | |
0f113f3e | 34 | iv = &(*ivec)[0]; |
d02b48c6 | 35 | |
0f113f3e MC |
36 | if (enc) { |
37 | c2l(iv, tout0); | |
38 | c2l(iv, tout1); | |
39 | for (l -= 8; l >= 0; l -= 8) { | |
40 | c2l(in, tin0); | |
41 | c2l(in, tin1); | |
42 | tin0 ^= tout0 ^ inW0; | |
43 | tin[0] = tin0; | |
44 | tin1 ^= tout1 ^ inW1; | |
45 | tin[1] = tin1; | |
46 | DES_encrypt1(tin, schedule, DES_ENCRYPT); | |
47 | tout0 = tin[0] ^ outW0; | |
48 | l2c(tout0, out); | |
49 | tout1 = tin[1] ^ outW1; | |
50 | l2c(tout1, out); | |
51 | } | |
52 | if (l != -8) { | |
53 | c2ln(in, tin0, tin1, l + 8); | |
54 | tin0 ^= tout0 ^ inW0; | |
55 | tin[0] = tin0; | |
56 | tin1 ^= tout1 ^ inW1; | |
57 | tin[1] = tin1; | |
58 | DES_encrypt1(tin, schedule, DES_ENCRYPT); | |
59 | tout0 = tin[0] ^ outW0; | |
60 | l2c(tout0, out); | |
61 | tout1 = tin[1] ^ outW1; | |
62 | l2c(tout1, out); | |
63 | } | |
64 | iv = &(*ivec)[0]; | |
65 | l2c(tout0, iv); | |
66 | l2c(tout1, iv); | |
67 | } else { | |
68 | c2l(iv, xor0); | |
69 | c2l(iv, xor1); | |
70 | for (l -= 8; l > 0; l -= 8) { | |
71 | c2l(in, tin0); | |
72 | tin[0] = tin0 ^ outW0; | |
73 | c2l(in, tin1); | |
74 | tin[1] = tin1 ^ outW1; | |
75 | DES_encrypt1(tin, schedule, DES_DECRYPT); | |
76 | tout0 = tin[0] ^ xor0 ^ inW0; | |
77 | tout1 = tin[1] ^ xor1 ^ inW1; | |
78 | l2c(tout0, out); | |
79 | l2c(tout1, out); | |
80 | xor0 = tin0; | |
81 | xor1 = tin1; | |
82 | } | |
83 | if (l != -8) { | |
84 | c2l(in, tin0); | |
85 | tin[0] = tin0 ^ outW0; | |
86 | c2l(in, tin1); | |
87 | tin[1] = tin1 ^ outW1; | |
88 | DES_encrypt1(tin, schedule, DES_DECRYPT); | |
89 | tout0 = tin[0] ^ xor0 ^ inW0; | |
90 | tout1 = tin[1] ^ xor1 ^ inW1; | |
91 | l2cn(tout0, tout1, out, l + 8); | |
92 | xor0 = tin0; | |
93 | xor1 = tin1; | |
94 | } | |
d02b48c6 | 95 | |
0f113f3e MC |
96 | iv = &(*ivec)[0]; |
97 | l2c(xor0, iv); | |
98 | l2c(xor1, iv); | |
99 | } | |
100 | tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; | |
101 | inW0 = inW1 = outW0 = outW1 = 0; | |
102 | tin[0] = tin[1] = 0; | |
103 | } |