/* crypto/cast/c_enc.c */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #include #include "cast_lcl.h" void CAST_encrypt(CAST_LONG *data, const CAST_KEY *key) { register CAST_LONG l, r, t; const register CAST_LONG *k; k = &(key->data[0]); l = data[0]; r = data[1]; E_CAST(0, k, l, r, +, ^, -); E_CAST(1, k, r, l, ^, -, +); E_CAST(2, k, l, r, -, +, ^); E_CAST(3, k, r, l, +, ^, -); E_CAST(4, k, l, r, ^, -, +); E_CAST(5, k, r, l, -, +, ^); E_CAST(6, k, l, r, +, ^, -); E_CAST(7, k, r, l, ^, -, +); E_CAST(8, k, l, r, -, +, ^); E_CAST(9, k, r, l, +, ^, -); E_CAST(10, k, l, r, ^, -, +); E_CAST(11, k, r, l, -, +, ^); if (!key->short_key) { E_CAST(12, k, l, r, +, ^, -); E_CAST(13, k, r, l, ^, -, +); E_CAST(14, k, l, r, -, +, ^); E_CAST(15, k, r, l, +, ^, -); } data[1] = l & 0xffffffffL; data[0] = r & 0xffffffffL; } void CAST_decrypt(CAST_LONG *data, const CAST_KEY *key) { register CAST_LONG l, r, t; const register CAST_LONG *k; k = &(key->data[0]); l = data[0]; r = data[1]; if (!key->short_key) { E_CAST(15, k, l, r, +, ^, -); E_CAST(14, k, r, l, -, +, ^); E_CAST(13, k, l, r, ^, -, +); E_CAST(12, k, r, l, +, ^, -); } E_CAST(11, k, l, r, -, +, ^); E_CAST(10, k, r, l, ^, -, +); E_CAST(9, k, l, r, +, ^, -); E_CAST(8, k, r, l, -, +, ^); E_CAST(7, k, l, r, ^, -, +); E_CAST(6, k, r, l, +, ^, -); E_CAST(5, k, l, r, -, +, ^); E_CAST(4, k, r, l, ^, -, +); E_CAST(3, k, l, r, +, ^, -); E_CAST(2, k, r, l, -, +, ^); E_CAST(1, k, l, r, ^, -, +); E_CAST(0, k, r, l, +, ^, -); data[1] = l & 0xffffffffL; data[0] = r & 0xffffffffL; } void CAST_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, const CAST_KEY *ks, unsigned char *iv, int enc) { register CAST_LONG tin0, tin1; register CAST_LONG tout0, tout1, xor0, xor1; register long l = length; CAST_LONG tin[2]; if (enc) { n2l(iv, tout0); n2l(iv, tout1); iv -= 8; for (l -= 8; l >= 0; l -= 8) { n2l(in, tin0); n2l(in, tin1); tin0 ^= tout0; tin1 ^= tout1; tin[0] = tin0; tin[1] = tin1; CAST_encrypt(tin, ks); tout0 = tin[0]; tout1 = tin[1]; l2n(tout0, out); l2n(tout1, out); } if (l != -8) { n2ln(in, tin0, tin1, l + 8); tin0 ^= tout0; tin1 ^= tout1; tin[0] = tin0; tin[1] = tin1; CAST_encrypt(tin, ks); tout0 = tin[0]; tout1 = tin[1]; l2n(tout0, out); l2n(tout1, out); } l2n(tout0, iv); l2n(tout1, iv); } else { n2l(iv, xor0); n2l(iv, xor1); iv -= 8; for (l -= 8; l >= 0; l -= 8) { n2l(in, tin0); n2l(in, tin1); tin[0] = tin0; tin[1] = tin1; CAST_decrypt(tin, ks); tout0 = tin[0] ^ xor0; tout1 = tin[1] ^ xor1; l2n(tout0, out); l2n(tout1, out); xor0 = tin0; xor1 = tin1; } if (l != -8) { n2l(in, tin0); n2l(in, tin1); tin[0] = tin0; tin[1] = tin1; CAST_decrypt(tin, ks); tout0 = tin[0] ^ xor0; tout1 = tin[1] ^ xor1; l2nn(tout0, tout1, out, l + 8); xor0 = tin0; xor1 = tin1; } l2n(xor0, iv); l2n(xor1, iv); } tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; tin[0] = tin[1] = 0; }