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d02b48c6 | 1 | /* crypto/des/ncbc_enc.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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 | void des_ncbc_encrypt(input, output, length, schedule, ivec, enc) | |
62 | des_cblock (*input); | |
63 | des_cblock (*output); | |
64 | long length; | |
65 | des_key_schedule schedule; | |
66 | des_cblock (*ivec); | |
67 | int enc; | |
68 | { | |
69 | register DES_LONG tin0,tin1; | |
70 | register DES_LONG tout0,tout1,xor0,xor1; | |
71 | register unsigned char *in,*out; | |
72 | register long l=length; | |
73 | DES_LONG tin[2]; | |
74 | unsigned char *iv; | |
75 | ||
76 | in=(unsigned char *)input; | |
77 | out=(unsigned char *)output; | |
78 | iv=(unsigned char *)ivec; | |
79 | ||
80 | if (enc) | |
81 | { | |
82 | c2l(iv,tout0); | |
83 | c2l(iv,tout1); | |
84 | for (l-=8; l>=0; l-=8) | |
85 | { | |
86 | c2l(in,tin0); | |
87 | c2l(in,tin1); | |
88 | tin0^=tout0; tin[0]=tin0; | |
89 | tin1^=tout1; tin[1]=tin1; | |
90 | des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT); | |
91 | tout0=tin[0]; l2c(tout0,out); | |
92 | tout1=tin[1]; l2c(tout1,out); | |
93 | } | |
94 | if (l != -8) | |
95 | { | |
96 | c2ln(in,tin0,tin1,l+8); | |
97 | tin0^=tout0; tin[0]=tin0; | |
98 | tin1^=tout1; tin[1]=tin1; | |
99 | des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT); | |
100 | tout0=tin[0]; l2c(tout0,out); | |
101 | tout1=tin[1]; l2c(tout1,out); | |
102 | } | |
103 | iv=(unsigned char *)ivec; | |
104 | l2c(tout0,iv); | |
105 | l2c(tout1,iv); | |
106 | } | |
107 | else | |
108 | { | |
109 | c2l(iv,xor0); | |
110 | c2l(iv,xor1); | |
111 | for (l-=8; l>=0; l-=8) | |
112 | { | |
113 | c2l(in,tin0); tin[0]=tin0; | |
114 | c2l(in,tin1); tin[1]=tin1; | |
115 | des_encrypt((DES_LONG *)tin,schedule,DES_DECRYPT); | |
116 | tout0=tin[0]^xor0; | |
117 | tout1=tin[1]^xor1; | |
118 | l2c(tout0,out); | |
119 | l2c(tout1,out); | |
120 | xor0=tin0; | |
121 | xor1=tin1; | |
122 | } | |
d02b48c6 RE |
123 | iv=(unsigned char *)ivec; |
124 | l2c(xor0,iv); | |
125 | l2c(xor1,iv); | |
126 | } | |
127 | tin0=tin1=tout0=tout1=xor0=xor1=0; | |
128 | tin[0]=tin[1]=0; | |
129 | } | |
130 |