1 /* $OpenBSD: cfb64ede.c,v 1.9 2015/02/07 13:19:15 doug 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 "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 66 void DES_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out, 67 long length, DES_key_schedule *ks1, 68 DES_key_schedule *ks2, DES_key_schedule *ks3, 69 DES_cblock *ivec, int *num, int enc) 70 { 71 DES_LONG v0,v1; 72 long l=length; 73 int n= *num; 74 DES_LONG ti[2]; 75 unsigned char *iv,c,cc; 76 77 iv=&(*ivec)[0]; 78 if (enc) 79 { 80 while (l--) 81 { 82 if (n == 0) 83 { 84 c2l(iv,v0); 85 c2l(iv,v1); 86 87 ti[0]=v0; 88 ti[1]=v1; 89 DES_encrypt3(ti,ks1,ks2,ks3); 90 v0=ti[0]; 91 v1=ti[1]; 92 93 iv = &(*ivec)[0]; 94 l2c(v0,iv); 95 l2c(v1,iv); 96 iv = &(*ivec)[0]; 97 } 98 c= *(in++)^iv[n]; 99 *(out++)=c; 100 iv[n]=c; 101 n=(n+1)&0x07; 102 } 103 } 104 else 105 { 106 while (l--) 107 { 108 if (n == 0) 109 { 110 c2l(iv,v0); 111 c2l(iv,v1); 112 113 ti[0]=v0; 114 ti[1]=v1; 115 DES_encrypt3(ti,ks1,ks2,ks3); 116 v0=ti[0]; 117 v1=ti[1]; 118 119 iv = &(*ivec)[0]; 120 l2c(v0,iv); 121 l2c(v1,iv); 122 iv = &(*ivec)[0]; 123 } 124 cc= *(in++); 125 c=iv[n]; 126 iv[n]=cc; 127 *(out++)=c^cc; 128 n=(n+1)&0x07; 129 } 130 } 131 v0=v1=ti[0]=ti[1]=c=cc=0; 132 *num=n; 133 } 134 135 /* This is compatible with the single key CFB-r for DES, even thought that's 136 * not what EVP needs. 137 */ 138 139 void DES_ede3_cfb_encrypt(const unsigned char *in,unsigned char *out, 140 int numbits,long length,DES_key_schedule *ks1, 141 DES_key_schedule *ks2,DES_key_schedule *ks3, 142 DES_cblock *ivec,int enc) 143 { 144 DES_LONG d0,d1,v0,v1; 145 unsigned long l=length,n=((unsigned int)numbits+7)/8; 146 int num=numbits,i; 147 DES_LONG ti[2]; 148 unsigned char *iv; 149 unsigned char ovec[16]; 150 151 if (num > 64) return; 152 iv = &(*ivec)[0]; 153 c2l(iv,v0); 154 c2l(iv,v1); 155 if (enc) 156 { 157 while (l >= n) 158 { 159 l-=n; 160 ti[0]=v0; 161 ti[1]=v1; 162 DES_encrypt3(ti,ks1,ks2,ks3); 163 c2ln(in,d0,d1,n); 164 in+=n; 165 d0^=ti[0]; 166 d1^=ti[1]; 167 l2cn(d0,d1,out,n); 168 out+=n; 169 /* 30-08-94 - eay - changed because l>>32 and 170 * l<<32 are bad under gcc :-( */ 171 if (num == 32) 172 { v0=v1; v1=d0; } 173 else if (num == 64) 174 { v0=d0; v1=d1; } 175 else 176 { 177 iv=&ovec[0]; 178 l2c(v0,iv); 179 l2c(v1,iv); 180 l2c(d0,iv); 181 l2c(d1,iv); 182 /* shift ovec left most of the bits... */ 183 memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0)); 184 /* now the remaining bits */ 185 if(num%8 != 0) 186 for(i=0 ; i < 8 ; ++i) 187 { 188 ovec[i]<<=num%8; 189 ovec[i]|=ovec[i+1]>>(8-num%8); 190 } 191 iv=&ovec[0]; 192 c2l(iv,v0); 193 c2l(iv,v1); 194 } 195 } 196 } 197 else 198 { 199 while (l >= n) 200 { 201 l-=n; 202 ti[0]=v0; 203 ti[1]=v1; 204 DES_encrypt3(ti,ks1,ks2,ks3); 205 c2ln(in,d0,d1,n); 206 in+=n; 207 /* 30-08-94 - eay - changed because l>>32 and 208 * l<<32 are bad under gcc :-( */ 209 if (num == 32) 210 { v0=v1; v1=d0; } 211 else if (num == 64) 212 { v0=d0; v1=d1; } 213 else 214 { 215 iv=&ovec[0]; 216 l2c(v0,iv); 217 l2c(v1,iv); 218 l2c(d0,iv); 219 l2c(d1,iv); 220 /* shift ovec left most of the bits... */ 221 memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0)); 222 /* now the remaining bits */ 223 if(num%8 != 0) 224 for(i=0 ; i < 8 ; ++i) 225 { 226 ovec[i]<<=num%8; 227 ovec[i]|=ovec[i+1]>>(8-num%8); 228 } 229 iv=&ovec[0]; 230 c2l(iv,v0); 231 c2l(iv,v1); 232 } 233 d0^=ti[0]; 234 d1^=ti[1]; 235 l2cn(d0,d1,out,n); 236 out+=n; 237 } 238 } 239 iv = &(*ivec)[0]; 240 l2c(v0,iv); 241 l2c(v1,iv); 242 v0=v1=d0=d1=ti[0]=ti[1]=0; 243 } 244 245