1*0Sstevel@tonic-gate /* crypto/aes/aes_ofb.c -*- mode:C; c-file-style: "eay" -*- */
2*0Sstevel@tonic-gate /* ====================================================================
3*0Sstevel@tonic-gate * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
4*0Sstevel@tonic-gate *
5*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without
6*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions
7*0Sstevel@tonic-gate * are met:
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the above copyright
10*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer.
11*0Sstevel@tonic-gate *
12*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright
13*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in
14*0Sstevel@tonic-gate * the documentation and/or other materials provided with the
15*0Sstevel@tonic-gate * distribution.
16*0Sstevel@tonic-gate *
17*0Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this
18*0Sstevel@tonic-gate * software must display the following acknowledgment:
19*0Sstevel@tonic-gate * "This product includes software developed by the OpenSSL Project
20*0Sstevel@tonic-gate * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
21*0Sstevel@tonic-gate *
22*0Sstevel@tonic-gate * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23*0Sstevel@tonic-gate * endorse or promote products derived from this software without
24*0Sstevel@tonic-gate * prior written permission. For written permission, please contact
25*0Sstevel@tonic-gate * openssl-core@openssl.org.
26*0Sstevel@tonic-gate *
27*0Sstevel@tonic-gate * 5. Products derived from this software may not be called "OpenSSL"
28*0Sstevel@tonic-gate * nor may "OpenSSL" appear in their names without prior written
29*0Sstevel@tonic-gate * permission of the OpenSSL Project.
30*0Sstevel@tonic-gate *
31*0Sstevel@tonic-gate * 6. Redistributions of any form whatsoever must retain the following
32*0Sstevel@tonic-gate * acknowledgment:
33*0Sstevel@tonic-gate * "This product includes software developed by the OpenSSL Project
34*0Sstevel@tonic-gate * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
35*0Sstevel@tonic-gate *
36*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37*0Sstevel@tonic-gate * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38*0Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39*0Sstevel@tonic-gate * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
40*0Sstevel@tonic-gate * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41*0Sstevel@tonic-gate * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42*0Sstevel@tonic-gate * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43*0Sstevel@tonic-gate * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44*0Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45*0Sstevel@tonic-gate * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46*0Sstevel@tonic-gate * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47*0Sstevel@tonic-gate * OF THE POSSIBILITY OF SUCH DAMAGE.
48*0Sstevel@tonic-gate * ====================================================================
49*0Sstevel@tonic-gate *
50*0Sstevel@tonic-gate */
51*0Sstevel@tonic-gate /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
52*0Sstevel@tonic-gate * All rights reserved.
53*0Sstevel@tonic-gate *
54*0Sstevel@tonic-gate * This package is an SSL implementation written
55*0Sstevel@tonic-gate * by Eric Young (eay@cryptsoft.com).
56*0Sstevel@tonic-gate * The implementation was written so as to conform with Netscapes SSL.
57*0Sstevel@tonic-gate *
58*0Sstevel@tonic-gate * This library is free for commercial and non-commercial use as long as
59*0Sstevel@tonic-gate * the following conditions are aheared to. The following conditions
60*0Sstevel@tonic-gate * apply to all code found in this distribution, be it the RC4, RSA,
61*0Sstevel@tonic-gate * lhash, DES, etc., code; not just the SSL code. The SSL documentation
62*0Sstevel@tonic-gate * included with this distribution is covered by the same copyright terms
63*0Sstevel@tonic-gate * except that the holder is Tim Hudson (tjh@cryptsoft.com).
64*0Sstevel@tonic-gate *
65*0Sstevel@tonic-gate * Copyright remains Eric Young's, and as such any Copyright notices in
66*0Sstevel@tonic-gate * the code are not to be removed.
67*0Sstevel@tonic-gate * If this package is used in a product, Eric Young should be given attribution
68*0Sstevel@tonic-gate * as the author of the parts of the library used.
69*0Sstevel@tonic-gate * This can be in the form of a textual message at program startup or
70*0Sstevel@tonic-gate * in documentation (online or textual) provided with the package.
71*0Sstevel@tonic-gate *
72*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without
73*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions
74*0Sstevel@tonic-gate * are met:
75*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the copyright
76*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer.
77*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright
78*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the
79*0Sstevel@tonic-gate * documentation and/or other materials provided with the distribution.
80*0Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this software
81*0Sstevel@tonic-gate * must display the following acknowledgement:
82*0Sstevel@tonic-gate * "This product includes cryptographic software written by
83*0Sstevel@tonic-gate * Eric Young (eay@cryptsoft.com)"
84*0Sstevel@tonic-gate * The word 'cryptographic' can be left out if the rouines from the library
85*0Sstevel@tonic-gate * being used are not cryptographic related :-).
86*0Sstevel@tonic-gate * 4. If you include any Windows specific code (or a derivative thereof) from
87*0Sstevel@tonic-gate * the apps directory (application code) you must include an acknowledgement:
88*0Sstevel@tonic-gate * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
89*0Sstevel@tonic-gate *
90*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
91*0Sstevel@tonic-gate * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
92*0Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
93*0Sstevel@tonic-gate * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
94*0Sstevel@tonic-gate * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
95*0Sstevel@tonic-gate * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
96*0Sstevel@tonic-gate * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
97*0Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
98*0Sstevel@tonic-gate * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
99*0Sstevel@tonic-gate * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
100*0Sstevel@tonic-gate * SUCH DAMAGE.
101*0Sstevel@tonic-gate *
102*0Sstevel@tonic-gate * The licence and distribution terms for any publically available version or
103*0Sstevel@tonic-gate * derivative of this code cannot be changed. i.e. this code cannot simply be
104*0Sstevel@tonic-gate * copied and put under another distribution licence
105*0Sstevel@tonic-gate * [including the GNU Public Licence.]
106*0Sstevel@tonic-gate */
107*0Sstevel@tonic-gate
108*0Sstevel@tonic-gate #ifndef AES_DEBUG
109*0Sstevel@tonic-gate # ifndef NDEBUG
110*0Sstevel@tonic-gate # define NDEBUG
111*0Sstevel@tonic-gate # endif
112*0Sstevel@tonic-gate #endif
113*0Sstevel@tonic-gate #include <assert.h>
114*0Sstevel@tonic-gate
115*0Sstevel@tonic-gate #include <openssl/aes.h>
116*0Sstevel@tonic-gate #include "aes_locl.h"
117*0Sstevel@tonic-gate
118*0Sstevel@tonic-gate /* The input and output encrypted as though 128bit ofb mode is being
119*0Sstevel@tonic-gate * used. The extra state information to record how much of the
120*0Sstevel@tonic-gate * 128bit block we have used is contained in *num;
121*0Sstevel@tonic-gate */
AES_ofb128_encrypt(const unsigned char * in,unsigned char * out,const unsigned long length,const AES_KEY * key,unsigned char * ivec,int * num)122*0Sstevel@tonic-gate void AES_ofb128_encrypt(const unsigned char *in, unsigned char *out,
123*0Sstevel@tonic-gate const unsigned long length, const AES_KEY *key,
124*0Sstevel@tonic-gate unsigned char *ivec, int *num) {
125*0Sstevel@tonic-gate
126*0Sstevel@tonic-gate unsigned int n;
127*0Sstevel@tonic-gate unsigned long l=length;
128*0Sstevel@tonic-gate
129*0Sstevel@tonic-gate assert(in && out && key && ivec && num);
130*0Sstevel@tonic-gate
131*0Sstevel@tonic-gate n = *num;
132*0Sstevel@tonic-gate
133*0Sstevel@tonic-gate while (l--) {
134*0Sstevel@tonic-gate if (n == 0) {
135*0Sstevel@tonic-gate AES_encrypt(ivec, ivec, key);
136*0Sstevel@tonic-gate }
137*0Sstevel@tonic-gate *(out++) = *(in++) ^ ivec[n];
138*0Sstevel@tonic-gate n = (n+1) % AES_BLOCK_SIZE;
139*0Sstevel@tonic-gate }
140*0Sstevel@tonic-gate
141*0Sstevel@tonic-gate *num=n;
142*0Sstevel@tonic-gate }
143