|
1 /* crypto/des/ofb64enc.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 EXPORT_C void DES_ofb64_encrypt(register const unsigned char *in, |
|
66 register unsigned char *out, long length, |
|
67 DES_key_schedule *schedule, DES_cblock *ivec, int *num) |
|
68 { |
|
69 register DES_LONG v0,v1,t; |
|
70 register int n= *num; |
|
71 register long l=length; |
|
72 DES_cblock d; |
|
73 register unsigned char *dp; |
|
74 DES_LONG ti[2]; |
|
75 unsigned char *iv; |
|
76 int save=0; |
|
77 |
|
78 iv = &(*ivec)[0]; |
|
79 c2l(iv,v0); |
|
80 c2l(iv,v1); |
|
81 ti[0]=v0; |
|
82 ti[1]=v1; |
|
83 dp=d; |
|
84 l2c(v0,dp); |
|
85 l2c(v1,dp); |
|
86 while (l--) |
|
87 { |
|
88 if (n == 0) |
|
89 { |
|
90 DES_encrypt1(ti,schedule,DES_ENCRYPT); |
|
91 dp=d; |
|
92 t=ti[0]; l2c(t,dp); |
|
93 t=ti[1]; l2c(t,dp); |
|
94 save++; |
|
95 } |
|
96 *(out++)= *(in++)^d[n]; |
|
97 n=(n+1)&0x07; |
|
98 } |
|
99 if (save) |
|
100 { |
|
101 v0=ti[0]; |
|
102 v1=ti[1]; |
|
103 iv = &(*ivec)[0]; |
|
104 l2c(v0,iv); |
|
105 l2c(v1,iv); |
|
106 } |
|
107 t=v0=v1=ti[0]=ti[1]=0; |
|
108 *num=n; |
|
109 } |
|
110 |