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58964a49 RE |
1 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
2 | * All rights reserved. | |
3 | * | |
4 | * This package is an SSL implementation written | |
5 | * by Eric Young (eay@cryptsoft.com). | |
6 | * The implementation was written so as to conform with Netscapes SSL. | |
0f113f3e | 7 | * |
58964a49 RE |
8 | * This library is free for commercial and non-commercial use as long as |
9 | * the following conditions are aheared to. The following conditions | |
10 | * apply to all code found in this distribution, be it the RC4, RSA, | |
11 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
12 | * included with this distribution is covered by the same copyright terms | |
13 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
0f113f3e | 14 | * |
58964a49 RE |
15 | * Copyright remains Eric Young's, and as such any Copyright notices in |
16 | * the code are not to be removed. | |
17 | * If this package is used in a product, Eric Young should be given attribution | |
18 | * as the author of the parts of the library used. | |
19 | * This can be in the form of a textual message at program startup or | |
20 | * in documentation (online or textual) provided with the package. | |
0f113f3e | 21 | * |
58964a49 RE |
22 | * Redistribution and use in source and binary forms, with or without |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
25 | * 1. Redistributions of source code must retain the copyright | |
26 | * notice, this list of conditions and the following disclaimer. | |
27 | * 2. Redistributions in binary form must reproduce the above copyright | |
28 | * notice, this list of conditions and the following disclaimer in the | |
29 | * documentation and/or other materials provided with the distribution. | |
30 | * 3. All advertising materials mentioning features or use of this software | |
31 | * must display the following acknowledgement: | |
32 | * "This product includes cryptographic software written by | |
33 | * Eric Young (eay@cryptsoft.com)" | |
34 | * The word 'cryptographic' can be left out if the rouines from the library | |
35 | * being used are not cryptographic related :-). | |
0f113f3e | 36 | * 4. If you include any Windows specific code (or a derivative thereof) from |
58964a49 RE |
37 | * the apps directory (application code) you must include an acknowledgement: |
38 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 39 | * |
58964a49 RE |
40 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
41 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
43 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
44 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
45 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
46 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
48 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
49 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
50 | * SUCH DAMAGE. | |
0f113f3e | 51 | * |
58964a49 RE |
52 | * The licence and distribution terms for any publically available version or |
53 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
54 | * copied and put under another distribution licence | |
55 | * [including the GNU Public Licence.] | |
56 | */ | |
57 | ||
ec577822 | 58 | #include <openssl/rc5.h> |
58964a49 RE |
59 | #include "rc5_locl.h" |
60 | ||
0f113f3e MC |
61 | /* |
62 | * The input and output encrypted as though 64bit cfb mode is being used. | |
63 | * The extra state information to record how much of the 64bit block we have | |
64 | * used is contained in *num; | |
58964a49 RE |
65 | */ |
66 | ||
1921eaad | 67 | void RC5_32_cfb64_encrypt(const unsigned char *in, unsigned char *out, |
0f113f3e MC |
68 | long length, RC5_32_KEY *schedule, |
69 | unsigned char *ivec, int *num, int encrypt) | |
70 | { | |
71 | register unsigned long v0, v1, t; | |
72 | register int n = *num; | |
73 | register long l = length; | |
74 | unsigned long ti[2]; | |
75 | unsigned char *iv, c, cc; | |
58964a49 | 76 | |
0f113f3e MC |
77 | iv = (unsigned char *)ivec; |
78 | if (encrypt) { | |
79 | while (l--) { | |
80 | if (n == 0) { | |
81 | c2l(iv, v0); | |
82 | ti[0] = v0; | |
83 | c2l(iv, v1); | |
84 | ti[1] = v1; | |
85 | RC5_32_encrypt((unsigned long *)ti, schedule); | |
86 | iv = (unsigned char *)ivec; | |
87 | t = ti[0]; | |
88 | l2c(t, iv); | |
89 | t = ti[1]; | |
90 | l2c(t, iv); | |
91 | iv = (unsigned char *)ivec; | |
92 | } | |
93 | c = *(in++) ^ iv[n]; | |
94 | *(out++) = c; | |
95 | iv[n] = c; | |
96 | n = (n + 1) & 0x07; | |
97 | } | |
98 | } else { | |
99 | while (l--) { | |
100 | if (n == 0) { | |
101 | c2l(iv, v0); | |
102 | ti[0] = v0; | |
103 | c2l(iv, v1); | |
104 | ti[1] = v1; | |
105 | RC5_32_encrypt((unsigned long *)ti, schedule); | |
106 | iv = (unsigned char *)ivec; | |
107 | t = ti[0]; | |
108 | l2c(t, iv); | |
109 | t = ti[1]; | |
110 | l2c(t, iv); | |
111 | iv = (unsigned char *)ivec; | |
112 | } | |
113 | cc = *(in++); | |
114 | c = iv[n]; | |
115 | iv[n] = cc; | |
116 | *(out++) = c ^ cc; | |
117 | n = (n + 1) & 0x07; | |
118 | } | |
119 | } | |
120 | v0 = v1 = ti[0] = ti[1] = t = c = cc = 0; | |
121 | *num = n; | |
122 | } |