1 /* crypto/des/cfb64ede.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 #include "e_os.h" 61 62 /* The input and output encrypted as though 64bit cfb mode is being 63 * used. The extra state information to record how much of the 64 * 64bit block we have used is contained in *num; 65 */ 66 67 void DES_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out, 68 long length, DES_key_schedule *ks1, 69 DES_key_schedule *ks2, DES_key_schedule *ks3, 70 DES_cblock *ivec, int *num, int enc) 71 { 72 register DES_LONG v0,v1; 73 register long l=length; 74 register int n= *num; 75 DES_LONG ti[2]; 76 unsigned char *iv,c,cc; 77 78 iv=&(*ivec)[0]; 79 if (enc) 80 { 81 while (l--) 82 { 83 if (n == 0) 84 { 85 c2l(iv,v0); 86 c2l(iv,v1); 87 88 ti[0]=v0; 89 ti[1]=v1; 90 DES_encrypt3(ti,ks1,ks2,ks3); 91 v0=ti[0]; 92 v1=ti[1]; 93 94 iv = &(*ivec)[0]; 95 l2c(v0,iv); 96 l2c(v1,iv); 97 iv = &(*ivec)[0]; 98 } 99 c= *(in++)^iv[n]; 100 *(out++)=c; 101 iv[n]=c; 102 n=(n+1)&0x07; 103 } 104 } 105 else 106 { 107 while (l--) 108 { 109 if (n == 0) 110 { 111 c2l(iv,v0); 112 c2l(iv,v1); 113 114 ti[0]=v0; 115 ti[1]=v1; 116 DES_encrypt3(ti,ks1,ks2,ks3); 117 v0=ti[0]; 118 v1=ti[1]; 119 120 iv = &(*ivec)[0]; 121 l2c(v0,iv); 122 l2c(v1,iv); 123 iv = &(*ivec)[0]; 124 } 125 cc= *(in++); 126 c=iv[n]; 127 iv[n]=cc; 128 *(out++)=c^cc; 129 n=(n+1)&0x07; 130 } 131 } 132 v0=v1=ti[0]=ti[1]=c=cc=0; 133 *num=n; 134 } 135 136 #ifdef undef /* MACRO */ 137 void DES_ede2_cfb64_encrypt(unsigned char *in, unsigned char *out, long length, 138 DES_key_schedule ks1, DES_key_schedule ks2, DES_cblock (*ivec), 139 int *num, int enc) 140 { 141 DES_ede3_cfb64_encrypt(in,out,length,ks1,ks2,ks1,ivec,num,enc); 142 } 143 #endif 144 145 /* This is compatible with the single key CFB-r for DES, even thought that's 146 * not what EVP needs. 147 */ 148 149 void DES_ede3_cfb_encrypt(const unsigned char *in,unsigned char *out, 150 int numbits,long length,DES_key_schedule *ks1, 151 DES_key_schedule *ks2,DES_key_schedule *ks3, 152 DES_cblock *ivec,int enc) 153 { 154 register DES_LONG d0,d1,v0,v1; 155 register unsigned long l=length,n=((unsigned int)numbits+7)/8; 156 register int num=numbits,i; 157 DES_LONG ti[2]; 158 unsigned char *iv; 159 unsigned char ovec[16]; 160 161 if (num > 64) return; 162 iv = &(*ivec)[0]; 163 c2l(iv,v0); 164 c2l(iv,v1); 165 if (enc) 166 { 167 while (l >= n) 168 { 169 l-=n; 170 ti[0]=v0; 171 ti[1]=v1; 172 DES_encrypt3(ti,ks1,ks2,ks3); 173 c2ln(in,d0,d1,n); 174 in+=n; 175 d0^=ti[0]; 176 d1^=ti[1]; 177 l2cn(d0,d1,out,n); 178 out+=n; 179 /* 30-08-94 - eay - changed because l>>32 and 180 * l<<32 are bad under gcc :-( */ 181 if (num == 32) 182 { v0=v1; v1=d0; } 183 else if (num == 64) 184 { v0=d0; v1=d1; } 185 else 186 { 187 iv=&ovec[0]; 188 l2c(v0,iv); 189 l2c(v1,iv); 190 l2c(d0,iv); 191 l2c(d1,iv); 192 /* shift ovec left most of the bits... */ 193 memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0)); 194 /* now the remaining bits */ 195 if(num%8 != 0) 196 for(i=0 ; i < 8 ; ++i) 197 { 198 ovec[i]<<=num%8; 199 ovec[i]|=ovec[i+1]>>(8-num%8); 200 } 201 iv=&ovec[0]; 202 c2l(iv,v0); 203 c2l(iv,v1); 204 } 205 } 206 } 207 else 208 { 209 while (l >= n) 210 { 211 l-=n; 212 ti[0]=v0; 213 ti[1]=v1; 214 DES_encrypt3(ti,ks1,ks2,ks3); 215 c2ln(in,d0,d1,n); 216 in+=n; 217 /* 30-08-94 - eay - changed because l>>32 and 218 * l<<32 are bad under gcc :-( */ 219 if (num == 32) 220 { v0=v1; v1=d0; } 221 else if (num == 64) 222 { v0=d0; v1=d1; } 223 else 224 { 225 iv=&ovec[0]; 226 l2c(v0,iv); 227 l2c(v1,iv); 228 l2c(d0,iv); 229 l2c(d1,iv); 230 /* shift ovec left most of the bits... */ 231 memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0)); 232 /* now the remaining bits */ 233 if(num%8 != 0) 234 for(i=0 ; i < 8 ; ++i) 235 { 236 ovec[i]<<=num%8; 237 ovec[i]|=ovec[i+1]>>(8-num%8); 238 } 239 iv=&ovec[0]; 240 c2l(iv,v0); 241 c2l(iv,v1); 242 } 243 d0^=ti[0]; 244 d1^=ti[1]; 245 l2cn(d0,d1,out,n); 246 out+=n; 247 } 248 } 249 iv = &(*ivec)[0]; 250 l2c(v0,iv); 251 l2c(v1,iv); 252 v0=v1=d0=d1=ti[0]=ti[1]=0; 253 } 254 255
