1 /* $NetBSD: bf_cbc.c,v 1.2 2000/08/31 06:46:21 itojun Exp $ */ 2 /* $KAME: bf_cbc.c,v 1.4 2000/08/31 05:41:02 itojun Exp $ */ 3 4 /* crypto/bf/bf_cbc.c */ 5 /* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au) 6 * All rights reserved. 7 * 8 * This package is an SSL implementation written 9 * by Eric Young (eay@mincom.oz.au). 10 * The implementation was written so as to conform with Netscapes SSL. 11 * 12 * This library is free for commercial and non-commercial use as long as 13 * the following conditions are aheared to. The following conditions 14 * apply to all code found in this distribution, be it the RC4, RSA, 15 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 16 * included with this distribution is covered by the same copyright terms 17 * except that the holder is Tim Hudson (tjh@mincom.oz.au). 18 * 19 * Copyright remains Eric Young's, and as such any Copyright notices in 20 * the code are not to be removed. 21 * If this package is used in a product, Eric Young should be given attribution 22 * as the author of the parts of the library used. 23 * This can be in the form of a textual message at program startup or 24 * in documentation (online or textual) provided with the package. 25 * 26 * Redistribution and use in source and binary forms, with or without 27 * modification, are permitted provided that the following conditions 28 * are met: 29 * 1. Redistributions of source code must retain the copyright 30 * notice, this list of conditions and the following disclaimer. 31 * 2. Redistributions in binary form must reproduce the above copyright 32 * notice, this list of conditions and the following disclaimer in the 33 * documentation and/or other materials provided with the distribution. 34 * 3. All advertising materials mentioning features or use of this software 35 * must display the following acknowledgement: 36 * "This product includes cryptographic software written by 37 * Eric Young (eay@mincom.oz.au)" 38 * The word 'cryptographic' can be left out if the rouines from the library 39 * being used are not cryptographic related :-). 40 * 4. If you include any Windows specific code (or a derivative thereof) from 41 * the apps directory (application code) you must include an acknowledgement: 42 * "This product includes software written by Tim Hudson (tjh@mincom.oz.au)" 43 * 44 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 45 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 46 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 47 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 48 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 49 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 50 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 51 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 52 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 53 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 54 * SUCH DAMAGE. 55 * 56 * The licence and distribution terms for any publically available version or 57 * derivative of this code cannot be changed. i.e. this code cannot simply be 58 * copied and put under another distribution licence 59 * [including the GNU Public Licence.] 60 */ 61 62 #include <sys/types.h> 63 #include <crypto/blowfish/blowfish.h> 64 #include <crypto/blowfish/bf_locl.h> 65 66 void BF_cbc_encrypt(in, out, length, ks, iv, encrypt) 67 unsigned char *in; 68 unsigned char *out; 69 long length; 70 BF_KEY *ks; 71 unsigned char *iv; 72 int encrypt; 73 { 74 register BF_LONG tin0,tin1; 75 register BF_LONG tout0,tout1,xor0,xor1; 76 register long l=length; 77 BF_LONG tin[2]; 78 79 if (encrypt) 80 { 81 n2l(iv,tout0); 82 n2l(iv,tout1); 83 iv-=8; 84 for (l-=8; l>=0; l-=8) 85 { 86 n2l(in,tin0); 87 n2l(in,tin1); 88 tin0^=tout0; 89 tin1^=tout1; 90 tin[0]=tin0; 91 tin[1]=tin1; 92 BF_encrypt(tin,ks,BF_ENCRYPT); 93 tout0=tin[0]; 94 tout1=tin[1]; 95 l2n(tout0,out); 96 l2n(tout1,out); 97 } 98 if (l != -8) 99 { 100 n2ln(in,tin0,tin1,l+8); 101 tin0^=tout0; 102 tin1^=tout1; 103 tin[0]=tin0; 104 tin[1]=tin1; 105 BF_encrypt(tin,ks,BF_ENCRYPT); 106 tout0=tin[0]; 107 tout1=tin[1]; 108 l2n(tout0,out); 109 l2n(tout1,out); 110 } 111 l2n(tout0,iv); 112 l2n(tout1,iv); 113 } 114 else 115 { 116 n2l(iv,xor0); 117 n2l(iv,xor1); 118 iv-=8; 119 for (l-=8; l>=0; l-=8) 120 { 121 n2l(in,tin0); 122 n2l(in,tin1); 123 tin[0]=tin0; 124 tin[1]=tin1; 125 BF_encrypt(tin,ks,BF_DECRYPT); 126 tout0=tin[0]^xor0; 127 tout1=tin[1]^xor1; 128 l2n(tout0,out); 129 l2n(tout1,out); 130 xor0=tin0; 131 xor1=tin1; 132 } 133 if (l != -8) 134 { 135 n2l(in,tin0); 136 n2l(in,tin1); 137 tin[0]=tin0; 138 tin[1]=tin1; 139 BF_encrypt(tin,ks,BF_DECRYPT); 140 tout0=tin[0]^xor0; 141 tout1=tin[1]^xor1; 142 l2nn(tout0,tout1,out,l+8); 143 xor0=tin0; 144 xor1=tin1; 145 } 146 l2n(xor0,iv); 147 l2n(xor1,iv); 148 } 149 tin0=tin1=tout0=tout1=xor0=xor1=0; 150 tin[0]=tin[1]=0; 151 } 152 153