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d02b48c6 | 1 | /* crypto/des/cfb64ede.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 | /* The input and output encrypted as though 64bit cfb 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 | ||
6b691a5c UM |
66 | void des_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out, |
67 | long length, des_key_schedule ks1, des_key_schedule ks2, | |
68 | des_key_schedule ks3, des_cblock ivec, int *num, int enc) | |
d02b48c6 RE |
69 | { |
70 | register DES_LONG v0,v1; | |
71 | register long l=length; | |
72 | register int n= *num; | |
73 | DES_LONG ti[2]; | |
74 | unsigned char *iv,c,cc; | |
75 | ||
4e31df2c | 76 | iv=ivec; |
d02b48c6 RE |
77 | if (enc) |
78 | { | |
79 | while (l--) | |
80 | { | |
81 | if (n == 0) | |
82 | { | |
83 | c2l(iv,v0); | |
84 | c2l(iv,v1); | |
85 | ||
86 | ti[0]=v0; | |
87 | ti[1]=v1; | |
4e31df2c | 88 | des_encrypt3(ti,ks1,ks2,ks3); |
d02b48c6 RE |
89 | v0=ti[0]; |
90 | v1=ti[1]; | |
91 | ||
4e31df2c | 92 | iv=ivec; |
d02b48c6 RE |
93 | l2c(v0,iv); |
94 | l2c(v1,iv); | |
4e31df2c | 95 | iv=ivec; |
d02b48c6 RE |
96 | } |
97 | c= *(in++)^iv[n]; | |
98 | *(out++)=c; | |
99 | iv[n]=c; | |
100 | n=(n+1)&0x07; | |
101 | } | |
102 | } | |
103 | else | |
104 | { | |
105 | while (l--) | |
106 | { | |
107 | if (n == 0) | |
108 | { | |
109 | c2l(iv,v0); | |
110 | c2l(iv,v1); | |
111 | ||
112 | ti[0]=v0; | |
113 | ti[1]=v1; | |
4e31df2c | 114 | des_encrypt3(ti,ks1,ks2,ks3); |
d02b48c6 RE |
115 | v0=ti[0]; |
116 | v1=ti[1]; | |
117 | ||
4e31df2c | 118 | iv=ivec; |
d02b48c6 RE |
119 | l2c(v0,iv); |
120 | l2c(v1,iv); | |
4e31df2c | 121 | iv=ivec; |
d02b48c6 RE |
122 | } |
123 | cc= *(in++); | |
124 | c=iv[n]; | |
125 | iv[n]=cc; | |
126 | *(out++)=c^cc; | |
127 | n=(n+1)&0x07; | |
128 | } | |
129 | } | |
130 | v0=v1=ti[0]=ti[1]=c=cc=0; | |
131 | *num=n; | |
132 | } | |
133 | ||
134 | #ifdef undef /* MACRO */ | |
6b691a5c UM |
135 | void des_ede2_cfb64_encrypt(unsigned char *in, unsigned char *out, long length, |
136 | des_key_schedule ks1, des_key_schedule ks2, des_cblock (*ivec), | |
137 | int *num, int enc) | |
d02b48c6 RE |
138 | { |
139 | des_ede3_cfb64_encrypt(in,out,length,ks1,ks2,ks1,ivec,num,enc); | |
140 | } | |
141 | #endif |