1 /*
2 * Copyright 1998-2016 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 * #included by:
12 * cbc_enc.c (DES_cbc_encrypt)
13 * des_enc.c (DES_ncbc_encrypt)
14 */
15
16 #include "des_local.h"
17
18 #ifdef CBC_ENC_C__DONT_UPDATE_IV
DES_cbc_encrypt(const unsigned char * in,unsigned char * out,long length,DES_key_schedule * _schedule,DES_cblock * ivec,int enc)19 void DES_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
20 DES_key_schedule *_schedule, DES_cblock *ivec, int enc)
21 #else
22 void DES_ncbc_encrypt(const unsigned char *in, unsigned char *out,
23 long length, DES_key_schedule *_schedule,
24 DES_cblock *ivec, int enc)
25 #endif
26 {
27 register DES_LONG tin0, tin1;
28 register DES_LONG tout0, tout1, xor0, xor1;
29 register long l = length;
30 DES_LONG tin[2];
31 unsigned char *iv;
32
33 iv = &(*ivec)[0];
34
35 if (enc) {
36 c2l(iv, tout0);
37 c2l(iv, tout1);
38 for (l -= 8; l >= 0; l -= 8) {
39 c2l(in, tin0);
40 c2l(in, tin1);
41 tin0 ^= tout0;
42 tin[0] = tin0;
43 tin1 ^= tout1;
44 tin[1] = tin1;
45 DES_encrypt1((DES_LONG *)tin, _schedule, DES_ENCRYPT);
46 tout0 = tin[0];
47 l2c(tout0, out);
48 tout1 = tin[1];
49 l2c(tout1, out);
50 }
51 if (l != -8) {
52 c2ln(in, tin0, tin1, l + 8);
53 tin0 ^= tout0;
54 tin[0] = tin0;
55 tin1 ^= tout1;
56 tin[1] = tin1;
57 DES_encrypt1((DES_LONG *)tin, _schedule, DES_ENCRYPT);
58 tout0 = tin[0];
59 l2c(tout0, out);
60 tout1 = tin[1];
61 l2c(tout1, out);
62 }
63 #ifndef CBC_ENC_C__DONT_UPDATE_IV
64 iv = &(*ivec)[0];
65 l2c(tout0, iv);
66 l2c(tout1, iv);
67 #endif
68 } else {
69 c2l(iv, xor0);
70 c2l(iv, xor1);
71 for (l -= 8; l >= 0; l -= 8) {
72 c2l(in, tin0);
73 tin[0] = tin0;
74 c2l(in, tin1);
75 tin[1] = tin1;
76 DES_encrypt1((DES_LONG *)tin, _schedule, DES_DECRYPT);
77 tout0 = tin[0] ^ xor0;
78 tout1 = tin[1] ^ xor1;
79 l2c(tout0, out);
80 l2c(tout1, out);
81 xor0 = tin0;
82 xor1 = tin1;
83 }
84 if (l != -8) {
85 c2l(in, tin0);
86 tin[0] = tin0;
87 c2l(in, tin1);
88 tin[1] = tin1;
89 DES_encrypt1((DES_LONG *)tin, _schedule, DES_DECRYPT);
90 tout0 = tin[0] ^ xor0;
91 tout1 = tin[1] ^ xor1;
92 l2cn(tout0, tout1, out, l + 8);
93 #ifndef CBC_ENC_C__DONT_UPDATE_IV
94 xor0 = tin0;
95 xor1 = tin1;
96 #endif
97 }
98 #ifndef CBC_ENC_C__DONT_UPDATE_IV
99 iv = &(*ivec)[0];
100 l2c(xor0, iv);
101 l2c(xor1, iv);
102 #endif
103 }
104 tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
105 tin[0] = tin[1] = 0;
106 }
107