1139790Simp/* crypto/rc2/rc2ofb64.c */ 2131903Smarcel/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3131903Smarcel * All rights reserved. 4131903Smarcel * 5131903Smarcel * This package is an SSL implementation written 6131903Smarcel * by Eric Young (eay@cryptsoft.com). 7131903Smarcel * The implementation was written so as to conform with Netscapes SSL. 8131903Smarcel * 9131903Smarcel * This library is free for commercial and non-commercial use as long as 10131903Smarcel * the following conditions are aheared to. The following conditions 11131903Smarcel * apply to all code found in this distribution, be it the RC4, RSA, 12131903Smarcel * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13131903Smarcel * included with this distribution is covered by the same copyright terms 14131903Smarcel * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15131903Smarcel * 16131903Smarcel * Copyright remains Eric Young's, and as such any Copyright notices in 17131903Smarcel * the code are not to be removed. 18131903Smarcel * If this package is used in a product, Eric Young should be given attribution 19131903Smarcel * as the author of the parts of the library used. 20131903Smarcel * This can be in the form of a textual message at program startup or 21131903Smarcel * in documentation (online or textual) provided with the package. 22131903Smarcel * 23131903Smarcel * Redistribution and use in source and binary forms, with or without 24131903Smarcel * modification, are permitted provided that the following conditions 25131903Smarcel * are met: 26131903Smarcel * 1. Redistributions of source code must retain the copyright 27131903Smarcel * notice, this list of conditions and the following disclaimer. 28131903Smarcel * 2. Redistributions in binary form must reproduce the above copyright 29131903Smarcel * notice, this list of conditions and the following disclaimer in the 30131903Smarcel * documentation and/or other materials provided with the distribution. 31131903Smarcel * 3. All advertising materials mentioning features or use of this software 32131903Smarcel * must display the following acknowledgement: 33131903Smarcel * "This product includes cryptographic software written by 34131903Smarcel * Eric Young (eay@cryptsoft.com)" 35157448Smarcel * The word 'cryptographic' can be left out if the rouines from the library 36157448Smarcel * being used are not cryptographic related :-). 37131903Smarcel * 4. If you include any Windows specific code (or a derivative thereof) from 38131903Smarcel * the apps directory (application code) you must include an acknowledgement: 39131903Smarcel * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40131903Smarcel * 41131903Smarcel * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42131903Smarcel * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43131903Smarcel * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44131903Smarcel * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45131903Smarcel * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46131903Smarcel * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47131903Smarcel * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48131903Smarcel * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49131903Smarcel * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50131903Smarcel * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51131903Smarcel * SUCH DAMAGE. 52131903Smarcel * 53131903Smarcel * The licence and distribution terms for any publically available version or 54131903Smarcel * 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 <openssl/rc2.h> 60#include "rc2_locl.h" 61 62/* 63 * The input and output encrypted as though 64bit ofb mode is being used. 64 * The extra state information to record how much of the 64bit block we have 65 * used is contained in *num; 66 */ 67void RC2_ofb64_encrypt(const unsigned char *in, unsigned char *out, 68 long length, RC2_KEY *schedule, unsigned char *ivec, 69 int *num) 70{ 71 register unsigned long v0, v1, t; 72 register int n = *num; 73 register long l = length; 74 unsigned char d[8]; 75 register char *dp; 76 unsigned long ti[2]; 77 unsigned char *iv; 78 int save = 0; 79 80 iv = (unsigned char *)ivec; 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 if (n == 0) { 90 RC2_encrypt((unsigned long *)ti, schedule); 91 dp = (char *)d; 92 t = ti[0]; 93 l2c(t, dp); 94 t = ti[1]; 95 l2c(t, dp); 96 save++; 97 } 98 *(out++) = *(in++) ^ d[n]; 99 n = (n + 1) & 0x07; 100 } 101 if (save) { 102 v0 = ti[0]; 103 v1 = ti[1]; 104 iv = (unsigned char *)ivec; 105 l2c(v0, iv); 106 l2c(v1, iv); 107 } 108 t = v0 = v1 = ti[0] = ti[1] = 0; 109 *num = n; 110} 111