/src/openssl111/crypto/des/xcbc_enc.c
Line | Count | Source (jump to first uncovered line) |
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 "des_local.h" |
11 | | |
12 | | /* RSA's DESX */ |
13 | | |
14 | | void DES_xcbc_encrypt(const unsigned char *in, unsigned char *out, |
15 | | long length, DES_key_schedule *schedule, |
16 | | DES_cblock *ivec, const_DES_cblock *inw, |
17 | | const_DES_cblock *outw, int enc) |
18 | 0 | { |
19 | 0 | register DES_LONG tin0, tin1; |
20 | 0 | register DES_LONG tout0, tout1, xor0, xor1; |
21 | 0 | register DES_LONG inW0, inW1, outW0, outW1; |
22 | 0 | register const unsigned char *in2; |
23 | 0 | register long l = length; |
24 | 0 | DES_LONG tin[2]; |
25 | 0 | unsigned char *iv; |
26 | |
|
27 | 0 | in2 = &(*inw)[0]; |
28 | 0 | c2l(in2, inW0); |
29 | 0 | c2l(in2, inW1); |
30 | 0 | in2 = &(*outw)[0]; |
31 | 0 | c2l(in2, outW0); |
32 | 0 | c2l(in2, outW1); |
33 | |
|
34 | 0 | iv = &(*ivec)[0]; |
35 | |
|
36 | 0 | if (enc) { |
37 | 0 | c2l(iv, tout0); |
38 | 0 | c2l(iv, tout1); |
39 | 0 | for (l -= 8; l >= 0; l -= 8) { |
40 | 0 | c2l(in, tin0); |
41 | 0 | c2l(in, tin1); |
42 | 0 | tin0 ^= tout0 ^ inW0; |
43 | 0 | tin[0] = tin0; |
44 | 0 | tin1 ^= tout1 ^ inW1; |
45 | 0 | tin[1] = tin1; |
46 | 0 | DES_encrypt1(tin, schedule, DES_ENCRYPT); |
47 | 0 | tout0 = tin[0] ^ outW0; |
48 | 0 | l2c(tout0, out); |
49 | 0 | tout1 = tin[1] ^ outW1; |
50 | 0 | l2c(tout1, out); |
51 | 0 | } |
52 | 0 | if (l != -8) { |
53 | 0 | c2ln(in, tin0, tin1, l + 8); |
54 | 0 | tin0 ^= tout0 ^ inW0; |
55 | 0 | tin[0] = tin0; |
56 | 0 | tin1 ^= tout1 ^ inW1; |
57 | 0 | tin[1] = tin1; |
58 | 0 | DES_encrypt1(tin, schedule, DES_ENCRYPT); |
59 | 0 | tout0 = tin[0] ^ outW0; |
60 | 0 | l2c(tout0, out); |
61 | 0 | tout1 = tin[1] ^ outW1; |
62 | 0 | l2c(tout1, out); |
63 | 0 | } |
64 | 0 | iv = &(*ivec)[0]; |
65 | 0 | l2c(tout0, iv); |
66 | 0 | l2c(tout1, iv); |
67 | 0 | } else { |
68 | 0 | c2l(iv, xor0); |
69 | 0 | c2l(iv, xor1); |
70 | 0 | for (l -= 8; l > 0; l -= 8) { |
71 | 0 | c2l(in, tin0); |
72 | 0 | tin[0] = tin0 ^ outW0; |
73 | 0 | c2l(in, tin1); |
74 | 0 | tin[1] = tin1 ^ outW1; |
75 | 0 | DES_encrypt1(tin, schedule, DES_DECRYPT); |
76 | 0 | tout0 = tin[0] ^ xor0 ^ inW0; |
77 | 0 | tout1 = tin[1] ^ xor1 ^ inW1; |
78 | 0 | l2c(tout0, out); |
79 | 0 | l2c(tout1, out); |
80 | 0 | xor0 = tin0; |
81 | 0 | xor1 = tin1; |
82 | 0 | } |
83 | 0 | if (l != -8) { |
84 | 0 | c2l(in, tin0); |
85 | 0 | tin[0] = tin0 ^ outW0; |
86 | 0 | c2l(in, tin1); |
87 | 0 | tin[1] = tin1 ^ outW1; |
88 | 0 | DES_encrypt1(tin, schedule, DES_DECRYPT); |
89 | 0 | tout0 = tin[0] ^ xor0 ^ inW0; |
90 | 0 | tout1 = tin[1] ^ xor1 ^ inW1; |
91 | 0 | l2cn(tout0, tout1, out, l + 8); |
92 | 0 | xor0 = tin0; |
93 | 0 | xor1 = tin1; |
94 | 0 | } |
95 | |
|
96 | 0 | iv = &(*ivec)[0]; |
97 | 0 | l2c(xor0, iv); |
98 | 0 | l2c(xor1, iv); |
99 | 0 | } |
100 | 0 | tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; |
101 | 0 | inW0 = inW1 = outW0 = outW1 = 0; |
102 | 0 | tin[0] = tin[1] = 0; |
103 | 0 | } |