1/* crypto/des/cfb64ede.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 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 66void 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) 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 76 iv=&(*ivec)[0]; 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; 88 des_encrypt3(ti,ks1,ks2,ks3); 89 v0=ti[0]; 90 v1=ti[1]; 91 92 iv = &(*ivec)[0]; 93 l2c(v0,iv); 94 l2c(v1,iv); 95 iv = &(*ivec)[0]; 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; 114 des_encrypt3(ti,ks1,ks2,ks3); 115 v0=ti[0]; 116 v1=ti[1]; 117 118 iv = &(*ivec)[0]; 119 l2c(v0,iv); 120 l2c(v1,iv); 121 iv = &(*ivec)[0]; 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 */ 135void 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) 138 { 139 des_ede3_cfb64_encrypt(in,out,length,ks1,ks2,ks1,ivec,num,enc); 140 } 141#endif 142