155714Skris/* crypto/cast/c_enc.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 <openssl/cast.h> 6055714Skris#include "cast_lcl.h" 6155714Skris 62205128Ssimonvoid CAST_encrypt(CAST_LONG *data, const CAST_KEY *key) 63280304Sjkim{ 64280304Sjkim register CAST_LONG l, r, t; 65280304Sjkim const register CAST_LONG *k; 6655714Skris 67280304Sjkim k = &(key->data[0]); 68280304Sjkim l = data[0]; 69280304Sjkim r = data[1]; 7055714Skris 71280304Sjkim E_CAST(0, k, l, r, +, ^, -); 72280304Sjkim E_CAST(1, k, r, l, ^, -, +); 73280304Sjkim E_CAST(2, k, l, r, -, +, ^); 74280304Sjkim E_CAST(3, k, r, l, +, ^, -); 75280304Sjkim E_CAST(4, k, l, r, ^, -, +); 76280304Sjkim E_CAST(5, k, r, l, -, +, ^); 77280304Sjkim E_CAST(6, k, l, r, +, ^, -); 78280304Sjkim E_CAST(7, k, r, l, ^, -, +); 79280304Sjkim E_CAST(8, k, l, r, -, +, ^); 80280304Sjkim E_CAST(9, k, r, l, +, ^, -); 81280304Sjkim E_CAST(10, k, l, r, ^, -, +); 82280304Sjkim E_CAST(11, k, r, l, -, +, ^); 83280304Sjkim if (!key->short_key) { 84280304Sjkim E_CAST(12, k, l, r, +, ^, -); 85280304Sjkim E_CAST(13, k, r, l, ^, -, +); 86280304Sjkim E_CAST(14, k, l, r, -, +, ^); 87280304Sjkim E_CAST(15, k, r, l, +, ^, -); 88280304Sjkim } 8955714Skris 90280304Sjkim data[1] = l & 0xffffffffL; 91280304Sjkim data[0] = r & 0xffffffffL; 92280304Sjkim} 9355714Skris 94205128Ssimonvoid CAST_decrypt(CAST_LONG *data, const CAST_KEY *key) 95280304Sjkim{ 96280304Sjkim register CAST_LONG l, r, t; 97280304Sjkim const register CAST_LONG *k; 9855714Skris 99280304Sjkim k = &(key->data[0]); 100280304Sjkim l = data[0]; 101280304Sjkim r = data[1]; 10255714Skris 103280304Sjkim if (!key->short_key) { 104280304Sjkim E_CAST(15, k, l, r, +, ^, -); 105280304Sjkim E_CAST(14, k, r, l, -, +, ^); 106280304Sjkim E_CAST(13, k, l, r, ^, -, +); 107280304Sjkim E_CAST(12, k, r, l, +, ^, -); 108280304Sjkim } 109280304Sjkim E_CAST(11, k, l, r, -, +, ^); 110280304Sjkim E_CAST(10, k, r, l, ^, -, +); 111280304Sjkim E_CAST(9, k, l, r, +, ^, -); 112280304Sjkim E_CAST(8, k, r, l, -, +, ^); 113280304Sjkim E_CAST(7, k, l, r, ^, -, +); 114280304Sjkim E_CAST(6, k, r, l, +, ^, -); 115280304Sjkim E_CAST(5, k, l, r, -, +, ^); 116280304Sjkim E_CAST(4, k, r, l, ^, -, +); 117280304Sjkim E_CAST(3, k, l, r, +, ^, -); 118280304Sjkim E_CAST(2, k, r, l, -, +, ^); 119280304Sjkim E_CAST(1, k, l, r, ^, -, +); 120280304Sjkim E_CAST(0, k, r, l, +, ^, -); 12155714Skris 122280304Sjkim data[1] = l & 0xffffffffL; 123280304Sjkim data[0] = r & 0xffffffffL; 124280304Sjkim} 12555714Skris 126280304Sjkimvoid CAST_cbc_encrypt(const unsigned char *in, unsigned char *out, 127280304Sjkim long length, const CAST_KEY *ks, unsigned char *iv, 128280304Sjkim int enc) 129280304Sjkim{ 130280304Sjkim register CAST_LONG tin0, tin1; 131280304Sjkim register CAST_LONG tout0, tout1, xor0, xor1; 132280304Sjkim register long l = length; 133280304Sjkim CAST_LONG tin[2]; 13455714Skris 135280304Sjkim if (enc) { 136280304Sjkim n2l(iv, tout0); 137280304Sjkim n2l(iv, tout1); 138280304Sjkim iv -= 8; 139280304Sjkim for (l -= 8; l >= 0; l -= 8) { 140280304Sjkim n2l(in, tin0); 141280304Sjkim n2l(in, tin1); 142280304Sjkim tin0 ^= tout0; 143280304Sjkim tin1 ^= tout1; 144280304Sjkim tin[0] = tin0; 145280304Sjkim tin[1] = tin1; 146280304Sjkim CAST_encrypt(tin, ks); 147280304Sjkim tout0 = tin[0]; 148280304Sjkim tout1 = tin[1]; 149280304Sjkim l2n(tout0, out); 150280304Sjkim l2n(tout1, out); 151280304Sjkim } 152280304Sjkim if (l != -8) { 153280304Sjkim n2ln(in, tin0, tin1, l + 8); 154280304Sjkim tin0 ^= tout0; 155280304Sjkim tin1 ^= tout1; 156280304Sjkim tin[0] = tin0; 157280304Sjkim tin[1] = tin1; 158280304Sjkim CAST_encrypt(tin, ks); 159280304Sjkim tout0 = tin[0]; 160280304Sjkim tout1 = tin[1]; 161280304Sjkim l2n(tout0, out); 162280304Sjkim l2n(tout1, out); 163280304Sjkim } 164280304Sjkim l2n(tout0, iv); 165280304Sjkim l2n(tout1, iv); 166280304Sjkim } else { 167280304Sjkim n2l(iv, xor0); 168280304Sjkim n2l(iv, xor1); 169280304Sjkim iv -= 8; 170280304Sjkim for (l -= 8; l >= 0; l -= 8) { 171280304Sjkim n2l(in, tin0); 172280304Sjkim n2l(in, tin1); 173280304Sjkim tin[0] = tin0; 174280304Sjkim tin[1] = tin1; 175280304Sjkim CAST_decrypt(tin, ks); 176280304Sjkim tout0 = tin[0] ^ xor0; 177280304Sjkim tout1 = tin[1] ^ xor1; 178280304Sjkim l2n(tout0, out); 179280304Sjkim l2n(tout1, out); 180280304Sjkim xor0 = tin0; 181280304Sjkim xor1 = tin1; 182280304Sjkim } 183280304Sjkim if (l != -8) { 184280304Sjkim n2l(in, tin0); 185280304Sjkim n2l(in, tin1); 186280304Sjkim tin[0] = tin0; 187280304Sjkim tin[1] = tin1; 188280304Sjkim CAST_decrypt(tin, ks); 189280304Sjkim tout0 = tin[0] ^ xor0; 190280304Sjkim tout1 = tin[1] ^ xor1; 191280304Sjkim l2nn(tout0, tout1, out, l + 8); 192280304Sjkim xor0 = tin0; 193280304Sjkim xor1 = tin1; 194280304Sjkim } 195280304Sjkim l2n(xor0, iv); 196280304Sjkim l2n(xor1, iv); 197280304Sjkim } 198280304Sjkim tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; 199280304Sjkim tin[0] = tin[1] = 0; 200280304Sjkim} 201