1/* crypto/des/ncbc_enc.c */
2/* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@mincom.oz.au).
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@mincom.oz.au).
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@mincom.oz.au)"
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@mincom.oz.au)"
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
61void des_ncbc_encrypt(input, output, length, schedule, ivec, encrypt)
62des_cblock (*input);
63des_cblock (*output);
64long length;
65des_key_schedule schedule;
66des_cblock (*ivec);
67int encrypt;
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 (encrypt)
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			}
123		if (l != -8)
124			{
125			c2l(in,tin0); tin[0]=tin0;
126			c2l(in,tin1); tin[1]=tin1;
127			des_encrypt((DES_LONG *)tin,schedule,DES_DECRYPT);
128			tout0=tin[0]^xor0;
129			tout1=tin[1]^xor1;
130			l2cn(tout0,tout1,out,l+8);
131			xor0=tin0;
132			xor1=tin1;
133			}
134		iv=(unsigned char *)ivec;
135		l2c(xor0,iv);
136		l2c(xor1,iv);
137		}
138	tin0=tin1=tout0=tout1=xor0=xor1=0;
139	tin[0]=tin[1]=0;
140	}
141
142