Branch data Line data Source code
1 : : /* crypto/des/pcbc_enc.c */
2 : : /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 : : * All rights reserved.
4 : : *
5 : : * This package is an SSL implementation written
6 : : * by Eric Young (eay@cryptsoft.com).
7 : : * The implementation was written so as to conform with Netscapes SSL.
8 : : *
9 : : * This library is free for commercial and non-commercial use as long as
10 : : * the following conditions are aheared to. The following conditions
11 : : * apply to all code found in this distribution, be it the RC4, RSA,
12 : : * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 : : * included with this distribution is covered by the same copyright terms
14 : : * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 : : *
16 : : * Copyright remains Eric Young's, and as such any Copyright notices in
17 : : * the code are not to be removed.
18 : : * If this package is used in a product, Eric Young should be given attribution
19 : : * as the author of the parts of the library used.
20 : : * This can be in the form of a textual message at program startup or
21 : : * in documentation (online or textual) provided with the package.
22 : : *
23 : : * Redistribution and use in source and binary forms, with or without
24 : : * modification, are permitted provided that the following conditions
25 : : * are met:
26 : : * 1. Redistributions of source code must retain the copyright
27 : : * notice, this list of conditions and the following disclaimer.
28 : : * 2. Redistributions in binary form must reproduce the above copyright
29 : : * notice, this list of conditions and the following disclaimer in the
30 : : * documentation and/or other materials provided with the distribution.
31 : : * 3. All advertising materials mentioning features or use of this software
32 : : * must display the following acknowledgement:
33 : : * "This product includes cryptographic software written by
34 : : * Eric Young (eay@cryptsoft.com)"
35 : : * The word 'cryptographic' can be left out if the rouines from the library
36 : : * being used are not cryptographic related :-).
37 : : * 4. If you include any Windows specific code (or a derivative thereof) from
38 : : * the apps directory (application code) you must include an acknowledgement:
39 : : * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 : : *
41 : : * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 : : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 : : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 : : * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 : : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 : : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 : : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 : : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 : : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 : : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 : : * SUCH DAMAGE.
52 : : *
53 : : * The licence and distribution terms for any publically available version or
54 : : * derivative of this code cannot be changed. i.e. this code cannot simply be
55 : : * copied and put under another distribution licence
56 : : * [including the GNU Public Licence.]
57 : : */
58 : :
59 : : #include "des_locl.h"
60 : :
61 : 2 : void DES_pcbc_encrypt(const unsigned char *input, unsigned char *output,
62 : : long length, DES_key_schedule *schedule,
63 : : DES_cblock *ivec, int enc)
64 : : {
65 : : register DES_LONG sin0,sin1,xor0,xor1,tout0,tout1;
66 : : DES_LONG tin[2];
67 : : const unsigned char *in;
68 : : unsigned char *out,*iv;
69 : :
70 : 2 : in=input;
71 : 2 : out=output;
72 : 2 : iv = &(*ivec)[0];
73 : :
74 [ + + ]: 2 : if (enc)
75 : : {
76 : 1 : c2l(iv,xor0);
77 : 1 : c2l(iv,xor1);
78 [ + + ]: 5 : for (; length>0; length-=8)
79 : : {
80 [ + + ]: 4 : if (length >= 8)
81 : : {
82 : 3 : c2l(in,sin0);
83 : 3 : c2l(in,sin1);
84 : : }
85 : : else
86 [ - - - + : 1 : c2ln(in,sin0,sin1,length);
- - - -
- ]
87 : 4 : tin[0]=sin0^xor0;
88 : 4 : tin[1]=sin1^xor1;
89 : 4 : DES_encrypt1((DES_LONG *)tin,schedule,DES_ENCRYPT);
90 : 4 : tout0=tin[0];
91 : 4 : tout1=tin[1];
92 : 4 : xor0=sin0^tout0;
93 : 4 : xor1=sin1^tout1;
94 : 4 : l2c(tout0,out);
95 : 4 : l2c(tout1,out);
96 : : }
97 : : }
98 : : else
99 : : {
100 : 1 : c2l(iv,xor0); c2l(iv,xor1);
101 [ + + ]: 5 : for (; length>0; length-=8)
102 : : {
103 : 4 : c2l(in,sin0);
104 : 4 : c2l(in,sin1);
105 : 4 : tin[0]=sin0;
106 : 4 : tin[1]=sin1;
107 : 4 : DES_encrypt1((DES_LONG *)tin,schedule,DES_DECRYPT);
108 : 4 : tout0=tin[0]^xor0;
109 : 4 : tout1=tin[1]^xor1;
110 [ + + ]: 4 : if (length >= 8)
111 : : {
112 : 3 : l2c(tout0,out);
113 : 3 : l2c(tout1,out);
114 : : }
115 : : else
116 [ - - - + : 1 : l2cn(tout0,tout1,out,length);
- - - -
- ]
117 : 4 : xor0=tout0^sin0;
118 : 4 : xor1=tout1^sin1;
119 : : }
120 : : }
121 : : tin[0]=tin[1]=0;
122 : 2 : sin0=sin1=xor0=xor1=tout0=tout1=0;
123 : 2 : }
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