/* crypto/rc5/rc5_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 #include "rc5_locl.h" void RC5_32_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, RC5_32_KEY *ks, unsigned char *iv, int encrypt) { register unsigned long tin0, tin1; register unsigned long tout0, tout1, xor0, xor1; register long l = length; unsigned long tin[2]; if (encrypt) { c2l(iv, tout0); c2l(iv, tout1); iv -= 8; for (l -= 8; l >= 0; l -= 8) { c2l(in, tin0); c2l(in, tin1); tin0 ^= tout0; tin1 ^= tout1; tin[0] = tin0; tin[1] = tin1; RC5_32_encrypt(tin, ks); tout0 = tin[0]; l2c(tout0, out); tout1 = tin[1]; l2c(tout1, out); } if (l != -8) { c2ln(in, tin0, tin1, l + 8); tin0 ^= tout0; tin1 ^= tout1; tin[0] = tin0; tin[1] = tin1; RC5_32_encrypt(tin, ks); tout0 = tin[0]; l2c(tout0, out); tout1 = tin[1]; l2c(tout1, out); } l2c(tout0, iv); l2c(tout1, iv); } else { c2l(iv, xor0); c2l(iv, xor1); iv -= 8; for (l -= 8; l >= 0; l -= 8) { c2l(in, tin0); tin[0] = tin0; c2l(in, tin1); tin[1] = tin1; RC5_32_decrypt(tin, ks); tout0 = tin[0] ^ xor0; tout1 = tin[1] ^ xor1; l2c(tout0, out); l2c(tout1, out); xor0 = tin0; xor1 = tin1; } if (l != -8) { c2l(in, tin0); tin[0] = tin0; c2l(in, tin1); tin[1] = tin1; RC5_32_decrypt(tin, ks); tout0 = tin[0] ^ xor0; tout1 = tin[1] ^ xor1; l2cn(tout0, tout1, out, l + 8); xor0 = tin0; xor1 = tin1; } l2c(xor0, iv); l2c(xor1, iv); } tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; tin[0] = tin[1] = 0; } void RC5_32_encrypt(unsigned long *d, RC5_32_KEY *key) { RC5_32_INT a, b, *s; s = key->data; a = d[0] + s[0]; b = d[1] + s[1]; E_RC5_32(a, b, s, 2); E_RC5_32(a, b, s, 4); E_RC5_32(a, b, s, 6); E_RC5_32(a, b, s, 8); E_RC5_32(a, b, s, 10); E_RC5_32(a, b, s, 12); E_RC5_32(a, b, s, 14); E_RC5_32(a, b, s, 16); if (key->rounds == 12) { E_RC5_32(a, b, s, 18); E_RC5_32(a, b, s, 20); E_RC5_32(a, b, s, 22); E_RC5_32(a, b, s, 24); } else if (key->rounds == 16) { /* Do a full expansion to avoid a jump */ E_RC5_32(a, b, s, 18); E_RC5_32(a, b, s, 20); E_RC5_32(a, b, s, 22); E_RC5_32(a, b, s, 24); E_RC5_32(a, b, s, 26); E_RC5_32(a, b, s, 28); E_RC5_32(a, b, s, 30); E_RC5_32(a, b, s, 32); } d[0] = a; d[1] = b; } void RC5_32_decrypt(unsigned long *d, RC5_32_KEY *key) { RC5_32_INT a, b, *s; s = key->data; a = d[0]; b = d[1]; if (key->rounds == 16) { D_RC5_32(a, b, s, 32); D_RC5_32(a, b, s, 30); D_RC5_32(a, b, s, 28); D_RC5_32(a, b, s, 26); /* Do a full expansion to avoid a jump */ D_RC5_32(a, b, s, 24); D_RC5_32(a, b, s, 22); D_RC5_32(a, b, s, 20); D_RC5_32(a, b, s, 18); } else if (key->rounds == 12) { D_RC5_32(a, b, s, 24); D_RC5_32(a, b, s, 22); D_RC5_32(a, b, s, 20); D_RC5_32(a, b, s, 18); } D_RC5_32(a, b, s, 16); D_RC5_32(a, b, s, 14); D_RC5_32(a, b, s, 12); D_RC5_32(a, b, s, 10); D_RC5_32(a, b, s, 8); D_RC5_32(a, b, s, 6); D_RC5_32(a, b, s, 4); D_RC5_32(a, b, s, 2); d[0] = a - s[0]; d[1] = b - s[1]; }