1 /* $OpenBSD: c_enc.c,v 1.7 2014/10/28 07:35:58 jsg Exp $ */ 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 <openssl/cast.h> 60 #include "cast_lcl.h" 61 62 #ifndef OPENBSD_CAST_ASM 63 void CAST_encrypt(CAST_LONG *data, const CAST_KEY *key) 64 { 65 CAST_LONG l,r,t; 66 const CAST_LONG *k; 67 68 k= &(key->data[0]); 69 l=data[0]; 70 r=data[1]; 71 72 E_CAST( 0,k,l,r,+,^,-); 73 E_CAST( 1,k,r,l,^,-,+); 74 E_CAST( 2,k,l,r,-,+,^); 75 E_CAST( 3,k,r,l,+,^,-); 76 E_CAST( 4,k,l,r,^,-,+); 77 E_CAST( 5,k,r,l,-,+,^); 78 E_CAST( 6,k,l,r,+,^,-); 79 E_CAST( 7,k,r,l,^,-,+); 80 E_CAST( 8,k,l,r,-,+,^); 81 E_CAST( 9,k,r,l,+,^,-); 82 E_CAST(10,k,l,r,^,-,+); 83 E_CAST(11,k,r,l,-,+,^); 84 if(!key->short_key) 85 { 86 E_CAST(12,k,l,r,+,^,-); 87 E_CAST(13,k,r,l,^,-,+); 88 E_CAST(14,k,l,r,-,+,^); 89 E_CAST(15,k,r,l,+,^,-); 90 } 91 92 data[1]=l&0xffffffffL; 93 data[0]=r&0xffffffffL; 94 } 95 96 void CAST_decrypt(CAST_LONG *data, const CAST_KEY *key) 97 { 98 CAST_LONG l,r,t; 99 const CAST_LONG *k; 100 101 k= &(key->data[0]); 102 l=data[0]; 103 r=data[1]; 104 105 if(!key->short_key) 106 { 107 E_CAST(15,k,l,r,+,^,-); 108 E_CAST(14,k,r,l,-,+,^); 109 E_CAST(13,k,l,r,^,-,+); 110 E_CAST(12,k,r,l,+,^,-); 111 } 112 E_CAST(11,k,l,r,-,+,^); 113 E_CAST(10,k,r,l,^,-,+); 114 E_CAST( 9,k,l,r,+,^,-); 115 E_CAST( 8,k,r,l,-,+,^); 116 E_CAST( 7,k,l,r,^,-,+); 117 E_CAST( 6,k,r,l,+,^,-); 118 E_CAST( 5,k,l,r,-,+,^); 119 E_CAST( 4,k,r,l,^,-,+); 120 E_CAST( 3,k,l,r,+,^,-); 121 E_CAST( 2,k,r,l,-,+,^); 122 E_CAST( 1,k,l,r,^,-,+); 123 E_CAST( 0,k,r,l,+,^,-); 124 125 data[1]=l&0xffffffffL; 126 data[0]=r&0xffffffffL; 127 } 128 #endif 129 130 void CAST_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, 131 const CAST_KEY *ks, unsigned char *iv, int enc) 132 { 133 CAST_LONG tin0,tin1; 134 CAST_LONG tout0,tout1,xor0,xor1; 135 long l=length; 136 CAST_LONG tin[2]; 137 138 if (enc) 139 { 140 n2l(iv,tout0); 141 n2l(iv,tout1); 142 iv-=8; 143 for (l-=8; l>=0; l-=8) 144 { 145 n2l(in,tin0); 146 n2l(in,tin1); 147 tin0^=tout0; 148 tin1^=tout1; 149 tin[0]=tin0; 150 tin[1]=tin1; 151 CAST_encrypt(tin,ks); 152 tout0=tin[0]; 153 tout1=tin[1]; 154 l2n(tout0,out); 155 l2n(tout1,out); 156 } 157 if (l != -8) 158 { 159 n2ln(in,tin0,tin1,l+8); 160 tin0^=tout0; 161 tin1^=tout1; 162 tin[0]=tin0; 163 tin[1]=tin1; 164 CAST_encrypt(tin,ks); 165 tout0=tin[0]; 166 tout1=tin[1]; 167 l2n(tout0,out); 168 l2n(tout1,out); 169 } 170 l2n(tout0,iv); 171 l2n(tout1,iv); 172 } 173 else 174 { 175 n2l(iv,xor0); 176 n2l(iv,xor1); 177 iv-=8; 178 for (l-=8; l>=0; l-=8) 179 { 180 n2l(in,tin0); 181 n2l(in,tin1); 182 tin[0]=tin0; 183 tin[1]=tin1; 184 CAST_decrypt(tin,ks); 185 tout0=tin[0]^xor0; 186 tout1=tin[1]^xor1; 187 l2n(tout0,out); 188 l2n(tout1,out); 189 xor0=tin0; 190 xor1=tin1; 191 } 192 if (l != -8) 193 { 194 n2l(in,tin0); 195 n2l(in,tin1); 196 tin[0]=tin0; 197 tin[1]=tin1; 198 CAST_decrypt(tin,ks); 199 tout0=tin[0]^xor0; 200 tout1=tin[1]^xor1; 201 l2nn(tout0,tout1,out,l+8); 202 xor0=tin0; 203 xor1=tin1; 204 } 205 l2n(xor0,iv); 206 l2n(xor1,iv); 207 } 208 tin0=tin1=tout0=tout1=xor0=xor1=0; 209 tin[0]=tin[1]=0; 210 } 211