155714Skris/* crypto/des/cfb64ede.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 8280304Sjkim * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15280304Sjkim * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 22280304Sjkim * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 37280304Sjkim * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40280304Sjkim * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 52280304Sjkim * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5955714Skris#include "des_locl.h" 60160814Ssimon#include "e_os.h" 6155714Skris 62280304Sjkim/* 63280304Sjkim * The input and output encrypted as though 64bit cfb mode is being used. 64280304Sjkim * The extra state information to record how much of the 64bit block we have 65280304Sjkim * used is contained in *num; 6655714Skris */ 6755714Skris 68109998Smarkmvoid DES_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out, 69280304Sjkim long length, DES_key_schedule *ks1, 70280304Sjkim DES_key_schedule *ks2, DES_key_schedule *ks3, 71280304Sjkim DES_cblock *ivec, int *num, int enc) 72280304Sjkim{ 73280304Sjkim register DES_LONG v0, v1; 74280304Sjkim register long l = length; 75280304Sjkim register int n = *num; 76280304Sjkim DES_LONG ti[2]; 77280304Sjkim unsigned char *iv, c, cc; 7855714Skris 79280304Sjkim iv = &(*ivec)[0]; 80280304Sjkim if (enc) { 81280304Sjkim while (l--) { 82280304Sjkim if (n == 0) { 83280304Sjkim c2l(iv, v0); 84280304Sjkim c2l(iv, v1); 8555714Skris 86280304Sjkim ti[0] = v0; 87280304Sjkim ti[1] = v1; 88280304Sjkim DES_encrypt3(ti, ks1, ks2, ks3); 89280304Sjkim v0 = ti[0]; 90280304Sjkim v1 = ti[1]; 9155714Skris 92280304Sjkim iv = &(*ivec)[0]; 93280304Sjkim l2c(v0, iv); 94280304Sjkim l2c(v1, iv); 95280304Sjkim iv = &(*ivec)[0]; 96280304Sjkim } 97280304Sjkim c = *(in++) ^ iv[n]; 98280304Sjkim *(out++) = c; 99280304Sjkim iv[n] = c; 100280304Sjkim n = (n + 1) & 0x07; 101280304Sjkim } 102280304Sjkim } else { 103280304Sjkim while (l--) { 104280304Sjkim if (n == 0) { 105280304Sjkim c2l(iv, v0); 106280304Sjkim c2l(iv, v1); 10755714Skris 108280304Sjkim ti[0] = v0; 109280304Sjkim ti[1] = v1; 110280304Sjkim DES_encrypt3(ti, ks1, ks2, ks3); 111280304Sjkim v0 = ti[0]; 112280304Sjkim v1 = ti[1]; 11355714Skris 114280304Sjkim iv = &(*ivec)[0]; 115280304Sjkim l2c(v0, iv); 116280304Sjkim l2c(v1, iv); 117280304Sjkim iv = &(*ivec)[0]; 118280304Sjkim } 119280304Sjkim cc = *(in++); 120280304Sjkim c = iv[n]; 121280304Sjkim iv[n] = cc; 122280304Sjkim *(out++) = c ^ cc; 123280304Sjkim n = (n + 1) & 0x07; 124280304Sjkim } 125280304Sjkim } 126280304Sjkim v0 = v1 = ti[0] = ti[1] = c = cc = 0; 127280304Sjkim *num = n; 128280304Sjkim} 12955714Skris 130280304Sjkim#ifdef undef /* MACRO */ 131280304Sjkimvoid DES_ede2_cfb64_encrypt(unsigned char *in, unsigned char *out, 132280304Sjkim long length, DES_key_schedule ks1, 133280304Sjkim DES_key_schedule ks2, DES_cblock (*ivec), 134280304Sjkim int *num, int enc) 135280304Sjkim{ 136280304Sjkim DES_ede3_cfb64_encrypt(in, out, length, ks1, ks2, ks1, ivec, num, enc); 137280304Sjkim} 13855714Skris#endif 139142425Snectar 140280304Sjkim/* 141280304Sjkim * This is compatible with the single key CFB-r for DES, even thought that's 142142425Snectar * not what EVP needs. 143142425Snectar */ 144142425Snectar 145280304Sjkimvoid DES_ede3_cfb_encrypt(const unsigned char *in, unsigned char *out, 146280304Sjkim int numbits, long length, DES_key_schedule *ks1, 147280304Sjkim DES_key_schedule *ks2, DES_key_schedule *ks3, 148280304Sjkim DES_cblock *ivec, int enc) 149280304Sjkim{ 150280304Sjkim register DES_LONG d0, d1, v0, v1; 151280304Sjkim register unsigned long l = length, n = ((unsigned int)numbits + 7) / 8; 152280304Sjkim register int num = numbits, i; 153280304Sjkim DES_LONG ti[2]; 154280304Sjkim unsigned char *iv; 155280304Sjkim unsigned char ovec[16]; 156142425Snectar 157280304Sjkim if (num > 64) 158280304Sjkim return; 159280304Sjkim iv = &(*ivec)[0]; 160280304Sjkim c2l(iv, v0); 161280304Sjkim c2l(iv, v1); 162280304Sjkim if (enc) { 163280304Sjkim while (l >= n) { 164280304Sjkim l -= n; 165280304Sjkim ti[0] = v0; 166280304Sjkim ti[1] = v1; 167280304Sjkim DES_encrypt3(ti, ks1, ks2, ks3); 168280304Sjkim c2ln(in, d0, d1, n); 169280304Sjkim in += n; 170280304Sjkim d0 ^= ti[0]; 171280304Sjkim d1 ^= ti[1]; 172280304Sjkim l2cn(d0, d1, out, n); 173280304Sjkim out += n; 174280304Sjkim /* 175280304Sjkim * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under 176280304Sjkim * gcc :-( 177280304Sjkim */ 178280304Sjkim if (num == 32) { 179280304Sjkim v0 = v1; 180280304Sjkim v1 = d0; 181280304Sjkim } else if (num == 64) { 182280304Sjkim v0 = d0; 183280304Sjkim v1 = d1; 184280304Sjkim } else { 185280304Sjkim iv = &ovec[0]; 186280304Sjkim l2c(v0, iv); 187280304Sjkim l2c(v1, iv); 188280304Sjkim l2c(d0, iv); 189280304Sjkim l2c(d1, iv); 190280304Sjkim /* shift ovec left most of the bits... */ 191280304Sjkim memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0)); 192280304Sjkim /* now the remaining bits */ 193280304Sjkim if (num % 8 != 0) 194280304Sjkim for (i = 0; i < 8; ++i) { 195280304Sjkim ovec[i] <<= num % 8; 196280304Sjkim ovec[i] |= ovec[i + 1] >> (8 - num % 8); 197280304Sjkim } 198280304Sjkim iv = &ovec[0]; 199280304Sjkim c2l(iv, v0); 200280304Sjkim c2l(iv, v1); 201280304Sjkim } 202280304Sjkim } 203280304Sjkim } else { 204280304Sjkim while (l >= n) { 205280304Sjkim l -= n; 206280304Sjkim ti[0] = v0; 207280304Sjkim ti[1] = v1; 208280304Sjkim DES_encrypt3(ti, ks1, ks2, ks3); 209280304Sjkim c2ln(in, d0, d1, n); 210280304Sjkim in += n; 211280304Sjkim /* 212280304Sjkim * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under 213280304Sjkim * gcc :-( 214280304Sjkim */ 215280304Sjkim if (num == 32) { 216280304Sjkim v0 = v1; 217280304Sjkim v1 = d0; 218280304Sjkim } else if (num == 64) { 219280304Sjkim v0 = d0; 220280304Sjkim v1 = d1; 221280304Sjkim } else { 222280304Sjkim iv = &ovec[0]; 223280304Sjkim l2c(v0, iv); 224280304Sjkim l2c(v1, iv); 225280304Sjkim l2c(d0, iv); 226280304Sjkim l2c(d1, iv); 227280304Sjkim /* shift ovec left most of the bits... */ 228280304Sjkim memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0)); 229280304Sjkim /* now the remaining bits */ 230280304Sjkim if (num % 8 != 0) 231280304Sjkim for (i = 0; i < 8; ++i) { 232280304Sjkim ovec[i] <<= num % 8; 233280304Sjkim ovec[i] |= ovec[i + 1] >> (8 - num % 8); 234280304Sjkim } 235280304Sjkim iv = &ovec[0]; 236280304Sjkim c2l(iv, v0); 237280304Sjkim c2l(iv, v1); 238280304Sjkim } 239280304Sjkim d0 ^= ti[0]; 240280304Sjkim d1 ^= ti[1]; 241280304Sjkim l2cn(d0, d1, out, n); 242280304Sjkim out += n; 243280304Sjkim } 244280304Sjkim } 245280304Sjkim iv = &(*ivec)[0]; 246280304Sjkim l2c(v0, iv); 247280304Sjkim l2c(v1, iv); 248280304Sjkim v0 = v1 = d0 = d1 = ti[0] = ti[1] = 0; 249280304Sjkim} 250