1 /* crypto/des/ncbc_enc.c */
2 /*
3 * #included by:
4 * cbc_enc.c (DES_cbc_encrypt)
5 * des_enc.c (DES_ncbc_encrypt)
6 */
7 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
8 * All rights reserved.
9 *
10 * This package is an SSL implementation written
11 * by Eric Young (eay@cryptsoft.com).
12 * The implementation was written so as to conform with Netscapes SSL.
13 *
14 * This library is free for commercial and non-commercial use as long as
15 * the following conditions are aheared to. The following conditions
16 * apply to all code found in this distribution, be it the RC4, RSA,
17 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
18 * included with this distribution is covered by the same copyright terms
19 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
20 *
21 * Copyright remains Eric Young's, and as such any Copyright notices in
22 * the code are not to be removed.
23 * If this package is used in a product, Eric Young should be given attribution
24 * as the author of the parts of the library used.
25 * This can be in the form of a textual message at program startup or
26 * in documentation (online or textual) provided with the package.
27 *
28 * Redistribution and use in source and binary forms, with or without
29 * modification, are permitted provided that the following conditions
30 * are met:
31 * 1. Redistributions of source code must retain the copyright
32 * notice, this list of conditions and the following disclaimer.
33 * 2. Redistributions in binary form must reproduce the above copyright
34 * notice, this list of conditions and the following disclaimer in the
35 * documentation and/or other materials provided with the distribution.
36 * 3. All advertising materials mentioning features or use of this software
37 * must display the following acknowledgement:
38 * "This product includes cryptographic software written by
39 * Eric Young (eay@cryptsoft.com)"
40 * The word 'cryptographic' can be left out if the rouines from the library
41 * being used are not cryptographic related :-).
42 * 4. If you include any Windows specific code (or a derivative thereof) from
43 * the apps directory (application code) you must include an acknowledgement:
44 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
45 *
46 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
47 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
50 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56 * SUCH DAMAGE.
57 *
58 * The licence and distribution terms for any publically available version or
59 * derivative of this code cannot be changed. i.e. this code cannot simply be
60 * copied and put under another distribution licence
61 * [including the GNU Public Licence.]
62 */
63
64 #include "des_locl.h"
65
66 #ifdef CBC_ENC_C__DONT_UPDATE_IV
67 void DES_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
68 DES_key_schedule *_schedule, DES_cblock *ivec, int enc)
69 #else
70 void DES_ncbc_encrypt(const unsigned char *in, unsigned char *out, long length,
71 DES_key_schedule *_schedule, DES_cblock *ivec, int enc)
72 #endif
73 {
74 register DES_LONG tin0,tin1;
75 register DES_LONG tout0,tout1,xor0,xor1;
76 register long l=length;
77 DES_LONG tin[2];
78 unsigned char *iv;
79
80 iv = &(*ivec)[0];
81
82 if (enc)
83 {
84 c2l(iv,tout0);
85 c2l(iv,tout1);
86 for (l-=8; l>=0; l-=8)
87 {
88 c2l(in,tin0);
89 c2l(in,tin1);
90 tin0^=tout0; tin[0]=tin0;
91 tin1^=tout1; tin[1]=tin1;
92 DES_encrypt1((DES_LONG *)tin,_schedule,DES_ENCRYPT);
93 tout0=tin[0]; l2c(tout0,out);
94 tout1=tin[1]; l2c(tout1,out);
95 }
96 if (l != -8)
97 {
98 c2ln(in,tin0,tin1,l+8);
99 tin0^=tout0; tin[0]=tin0;
100 tin1^=tout1; tin[1]=tin1;
101 DES_encrypt1((DES_LONG *)tin,_schedule,DES_ENCRYPT);
102 tout0=tin[0]; l2c(tout0,out);
103 tout1=tin[1]; l2c(tout1,out);
104 }
105 #ifndef CBC_ENC_C__DONT_UPDATE_IV
106 iv = &(*ivec)[0];
107 l2c(tout0,iv);
108 l2c(tout1,iv);
109 #endif
110 }
111 else
112 {
113 c2l(iv,xor0);
114 c2l(iv,xor1);
115 for (l-=8; l>=0; l-=8)
116 {
117 c2l(in,tin0); tin[0]=tin0;
118 c2l(in,tin1); tin[1]=tin1;
119 DES_encrypt1((DES_LONG *)tin,_schedule,DES_DECRYPT);
120 tout0=tin[0]^xor0;
121 tout1=tin[1]^xor1;
122 l2c(tout0,out);
123 l2c(tout1,out);
124 xor0=tin0;
125 xor1=tin1;
126 }
127 if (l != -8)
128 {
129 c2l(in,tin0); tin[0]=tin0;
130 c2l(in,tin1); tin[1]=tin1;
131 DES_encrypt1((DES_LONG *)tin,_schedule,DES_DECRYPT);
132 tout0=tin[0]^xor0;
133 tout1=tin[1]^xor1;
134 l2cn(tout0,tout1,out,l+8);
135 #ifndef CBC_ENC_C__DONT_UPDATE_IV
136 xor0=tin0;
137 xor1=tin1;
138 #endif
139 }
140 #ifndef CBC_ENC_C__DONT_UPDATE_IV
141 iv = &(*ivec)[0];
142 l2c(xor0,iv);
143 l2c(xor1,iv);
144 #endif
145 }
146 tin0=tin1=tout0=tout1=xor0=xor1=0;
147 tin[0]=tin[1]=0;
148 }