Branch data Line data Source code
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 : 438 : 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 : 438 : register long l=length;
77 : : DES_LONG tin[2];
78 : : unsigned char *iv;
79 : :
80 : 438 : iv = &(*ivec)[0];
81 : :
82 [ + + ]: 438 : if (enc)
83 : : {
84 : 253 : c2l(iv,tout0);
85 : 253 : c2l(iv,tout1);
86 [ + + ]: 2948 : for (l-=8; l>=0; l-=8)
87 : : {
88 : 2695 : c2l(in,tin0);
89 : 2695 : c2l(in,tin1);
90 : 2695 : tin0^=tout0; tin[0]=tin0;
91 : 2695 : tin1^=tout1; tin[1]=tin1;
92 : 2695 : DES_encrypt1((DES_LONG *)tin,_schedule,DES_ENCRYPT);
93 : 2695 : tout0=tin[0]; l2c(tout0,out);
94 : 2695 : tout1=tin[1]; l2c(tout1,out);
95 : : }
96 [ + + ]: 253 : if (l != -8)
97 : : {
98 [ - - - + : 9 : c2ln(in,tin0,tin1,l+8);
- - - -
- ]
99 : 9 : tin0^=tout0; tin[0]=tin0;
100 : 9 : tin1^=tout1; tin[1]=tin1;
101 : 9 : DES_encrypt1((DES_LONG *)tin,_schedule,DES_ENCRYPT);
102 : 9 : tout0=tin[0]; l2c(tout0,out);
103 : 9 : tout1=tin[1]; l2c(tout1,out);
104 : : }
105 : : #ifndef CBC_ENC_C__DONT_UPDATE_IV
106 : 253 : iv = &(*ivec)[0];
107 : 253 : l2c(tout0,iv);
108 : 253 : l2c(tout1,iv);
109 : : #endif
110 : : }
111 : : else
112 : : {
113 : 185 : c2l(iv,xor0);
114 : 185 : c2l(iv,xor1);
115 [ + + ]: 2724 : for (l-=8; l>=0; l-=8)
116 : : {
117 : 2539 : c2l(in,tin0); tin[0]=tin0;
118 : 2539 : c2l(in,tin1); tin[1]=tin1;
119 : 2539 : DES_encrypt1((DES_LONG *)tin,_schedule,DES_DECRYPT);
120 : 2539 : tout0=tin[0]^xor0;
121 : 2539 : tout1=tin[1]^xor1;
122 : 2539 : l2c(tout0,out);
123 : 2539 : l2c(tout1,out);
124 : 2539 : xor0=tin0;
125 : 2539 : xor1=tin1;
126 : : }
127 [ + + ]: 185 : if (l != -8)
128 : : {
129 : 1 : c2l(in,tin0); tin[0]=tin0;
130 : 1 : c2l(in,tin1); tin[1]=tin1;
131 : 1 : DES_encrypt1((DES_LONG *)tin,_schedule,DES_DECRYPT);
132 : 1 : tout0=tin[0]^xor0;
133 : 1 : tout1=tin[1]^xor1;
134 [ - - - + : 1 : l2cn(tout0,tout1,out,l+8);
- - - -
- ]
135 : : #ifndef CBC_ENC_C__DONT_UPDATE_IV
136 : 1 : xor0=tin0;
137 : 1 : xor1=tin1;
138 : : #endif
139 : : }
140 : : #ifndef CBC_ENC_C__DONT_UPDATE_IV
141 : 185 : iv = &(*ivec)[0];
142 : 185 : l2c(xor0,iv);
143 : 185 : l2c(xor1,iv);
144 : : #endif
145 : : }
146 : 438 : tin0=tin1=tout0=tout1=xor0=xor1=0;
147 : : tin[0]=tin[1]=0;
148 : 438 : }
|
