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d2e9e320 | 1 | /* |
33388b44 | 2 | * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved. |
d02b48c6 | 3 | * |
2d48d5dd | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
d2e9e320 RS |
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 | ||
c6fec81b P |
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 | ||
706457b7 | 16 | #include "des_local.h" |
d02b48c6 RE |
17 | |
18 | /* RSA's DESX */ | |
19 | ||
c2e4f17c | 20 | void DES_xcbc_encrypt(const unsigned char *in, unsigned char *out, |
0f113f3e MC |
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; | |
d02b48c6 | 32 | |
0f113f3e MC |
33 | in2 = &(*inw)[0]; |
34 | c2l(in2, inW0); | |
35 | c2l(in2, inW1); | |
36 | in2 = &(*outw)[0]; | |
37 | c2l(in2, outW0); | |
38 | c2l(in2, outW1); | |
d02b48c6 | 39 | |
0f113f3e | 40 | iv = &(*ivec)[0]; |
d02b48c6 | 41 | |
0f113f3e MC |
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 | } | |
d02b48c6 | 101 | |
0f113f3e MC |
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 | } |