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1 /* crypto/des/ofb64ede.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 /* The input and output encrypted as though 64bit ofb mode is being | |
62 * used. The extra state information to record how much of the | |
63 * 64bit block we have used is contained in *num; | |
64 */ | |
65 void DES_ede3_ofb64_encrypt(register const unsigned char *in, | |
66 register unsigned char *out, long length, | |
67 DES_key_schedule *k1, DES_key_schedule *k2, | |
68 DES_key_schedule *k3, DES_cblock *ivec, | |
69 int *num) | |
70 { | |
71 register DES_LONG v0,v1; | |
72 register int n= *num; | |
73 register long l=length; | |
74 DES_cblock d; | |
75 register char *dp; | |
76 DES_LONG ti[2]; | |
77 unsigned char *iv; | |
78 int save=0; | |
79 | |
80 iv = &(*ivec)[0]; | |
81 c2l(iv,v0); | |
82 c2l(iv,v1); | |
83 ti[0]=v0; | |
84 ti[1]=v1; | |
85 dp=(char *)d; | |
86 l2c(v0,dp); | |
87 l2c(v1,dp); | |
88 while (l--) | |
89 { | |
90 if (n == 0) | |
91 { | |
92 /* ti[0]=v0; */ | |
93 /* ti[1]=v1; */ | |
94 DES_encrypt3(ti,k1,k2,k3); | |
95 v0=ti[0]; | |
96 v1=ti[1]; | |
97 | |
98 dp=(char *)d; | |
99 l2c(v0,dp); | |
100 l2c(v1,dp); | |
101 save++; | |
102 } | |
103 *(out++)= *(in++)^d[n]; | |
104 n=(n+1)&0x07; | |
105 } | |
106 if (save) | |
107 { | |
108 /* v0=ti[0]; | |
109 v1=ti[1];*/ | |
110 iv = &(*ivec)[0]; | |
111 l2c(v0,iv); | |
112 l2c(v1,iv); | |
113 } | |
114 v0=v1=ti[0]=ti[1]=0; | |
115 *num=n; | |
116 } | |
117 | |
118 #ifdef undef /* MACRO */ | |
119 void DES_ede2_ofb64_encrypt(register unsigned char *in, | |
120 register unsigned char *out, long length, DES_key_schedule k1, | |
121 DES_key_schedule k2, DES_cblock (*ivec), int *num) | |
122 { | |
123 DES_ede3_ofb64_encrypt(in, out, length, k1,k2,k1, ivec, num); | |
124 } | |
125 #endif | |
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