Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* crypto/des/cfb64ede.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 "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 | |