1 /* crypto/rc5/rc5_enc.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 <stdio.h> 60 #include <openssl/rc5.h> 61 #include "rc5_locl.h" 62 63 void RC5_32_cbc_encrypt(const unsigned char *in, unsigned char *out, 64 long length, RC5_32_KEY *ks, unsigned char *iv, 65 int encrypt) 66 { 67 register unsigned long tin0,tin1; 68 register unsigned long tout0,tout1,xor0,xor1; 69 register long l=length; 70 unsigned long tin[2]; 71 72 if (encrypt) 73 { 74 c2l(iv,tout0); 75 c2l(iv,tout1); 76 iv-=8; 77 for (l-=8; l>=0; l-=8) 78 { 79 c2l(in,tin0); 80 c2l(in,tin1); 81 tin0^=tout0; 82 tin1^=tout1; 83 tin[0]=tin0; 84 tin[1]=tin1; 85 RC5_32_encrypt(tin,ks); 86 tout0=tin[0]; l2c(tout0,out); 87 tout1=tin[1]; l2c(tout1,out); 88 } 89 if (l != -8) 90 { 91 c2ln(in,tin0,tin1,l+8); 92 tin0^=tout0; 93 tin1^=tout1; 94 tin[0]=tin0; 95 tin[1]=tin1; 96 RC5_32_encrypt(tin,ks); 97 tout0=tin[0]; l2c(tout0,out); 98 tout1=tin[1]; l2c(tout1,out); 99 } 100 l2c(tout0,iv); 101 l2c(tout1,iv); 102 } 103 else 104 { 105 c2l(iv,xor0); 106 c2l(iv,xor1); 107 iv-=8; 108 for (l-=8; l>=0; l-=8) 109 { 110 c2l(in,tin0); tin[0]=tin0; 111 c2l(in,tin1); tin[1]=tin1; 112 RC5_32_decrypt(tin,ks); 113 tout0=tin[0]^xor0; 114 tout1=tin[1]^xor1; 115 l2c(tout0,out); 116 l2c(tout1,out); 117 xor0=tin0; 118 xor1=tin1; 119 } 120 if (l != -8) 121 { 122 c2l(in,tin0); tin[0]=tin0; 123 c2l(in,tin1); tin[1]=tin1; 124 RC5_32_decrypt(tin,ks); 125 tout0=tin[0]^xor0; 126 tout1=tin[1]^xor1; 127 l2cn(tout0,tout1,out,l+8); 128 xor0=tin0; 129 xor1=tin1; 130 } 131 l2c(xor0,iv); 132 l2c(xor1,iv); 133 } 134 tin0=tin1=tout0=tout1=xor0=xor1=0; 135 tin[0]=tin[1]=0; 136 } 137 138 void RC5_32_encrypt(unsigned long *d, RC5_32_KEY *key) 139 { 140 RC5_32_INT a,b,*s; 141 142 s=key->data; 143 144 a=d[0]+s[0]; 145 b=d[1]+s[1]; 146 E_RC5_32(a,b,s, 2); 147 E_RC5_32(a,b,s, 4); 148 E_RC5_32(a,b,s, 6); 149 E_RC5_32(a,b,s, 8); 150 E_RC5_32(a,b,s,10); 151 E_RC5_32(a,b,s,12); 152 E_RC5_32(a,b,s,14); 153 E_RC5_32(a,b,s,16); 154 if (key->rounds == 12) 155 { 156 E_RC5_32(a,b,s,18); 157 E_RC5_32(a,b,s,20); 158 E_RC5_32(a,b,s,22); 159 E_RC5_32(a,b,s,24); 160 } 161 else if (key->rounds == 16) 162 { 163 /* Do a full expansion to avoid a jump */ 164 E_RC5_32(a,b,s,18); 165 E_RC5_32(a,b,s,20); 166 E_RC5_32(a,b,s,22); 167 E_RC5_32(a,b,s,24); 168 E_RC5_32(a,b,s,26); 169 E_RC5_32(a,b,s,28); 170 E_RC5_32(a,b,s,30); 171 E_RC5_32(a,b,s,32); 172 } 173 d[0]=a; 174 d[1]=b; 175 } 176 177 void RC5_32_decrypt(unsigned long *d, RC5_32_KEY *key) 178 { 179 RC5_32_INT a,b,*s; 180 181 s=key->data; 182 183 a=d[0]; 184 b=d[1]; 185 if (key->rounds == 16) 186 { 187 D_RC5_32(a,b,s,32); 188 D_RC5_32(a,b,s,30); 189 D_RC5_32(a,b,s,28); 190 D_RC5_32(a,b,s,26); 191 /* Do a full expansion to avoid a jump */ 192 D_RC5_32(a,b,s,24); 193 D_RC5_32(a,b,s,22); 194 D_RC5_32(a,b,s,20); 195 D_RC5_32(a,b,s,18); 196 } 197 else if (key->rounds == 12) 198 { 199 D_RC5_32(a,b,s,24); 200 D_RC5_32(a,b,s,22); 201 D_RC5_32(a,b,s,20); 202 D_RC5_32(a,b,s,18); 203 } 204 D_RC5_32(a,b,s,16); 205 D_RC5_32(a,b,s,14); 206 D_RC5_32(a,b,s,12); 207 D_RC5_32(a,b,s,10); 208 D_RC5_32(a,b,s, 8); 209 D_RC5_32(a,b,s, 6); 210 D_RC5_32(a,b,s, 4); 211 D_RC5_32(a,b,s, 2); 212 d[0]=a-s[0]; 213 d[1]=b-s[1]; 214 } 215 216