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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
DES_cbc_encrypt(const unsigned char * in,unsigned char * out,long length,DES_key_schedule * _schedule,DES_cblock * ivec,int enc)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 	}
149