/* $OpenBSD: rc2_cbc.c,v 1.8 2023/07/07 13:40:44 beck Exp $ */ /* 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 "rc2_local.h" void RC2_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, RC2_KEY *ks, unsigned char *iv, int encrypt) { unsigned long tin0, tin1; unsigned long tout0, tout1, xor0, xor1; 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; RC2_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; RC2_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; RC2_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; RC2_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; } LCRYPTO_ALIAS(RC2_cbc_encrypt); void RC2_encrypt(unsigned long *d, RC2_KEY *key) { int i, n; RC2_INT *p0, *p1; RC2_INT x0, x1, x2, x3, t; unsigned long l; l = d[0]; x0 = (RC2_INT)l & 0xffff; x1 = (RC2_INT)(l >> 16L); l = d[1]; x2 = (RC2_INT)l & 0xffff; x3 = (RC2_INT)(l >> 16L); n = 3; i = 5; p0 = p1 = &(key->data[0]); for (;;) { t = (x0 + (x1 & ~x3) + (x2 & x3) + *(p0++)) & 0xffff; x0 = (t << 1)|(t >> 15); t = (x1 + (x2 & ~x0) + (x3 & x0) + *(p0++)) & 0xffff; x1 = (t << 2)|(t >> 14); t = (x2 + (x3 & ~x1) + (x0 & x1) + *(p0++)) & 0xffff; x2 = (t << 3)|(t >> 13); t = (x3 + (x0 & ~x2) + (x1 & x2) + *(p0++)) & 0xffff; x3 = (t << 5)|(t >> 11); if (--i == 0) { if (--n == 0) break; i = (n == 2) ? 6 : 5; x0 += p1[x3 & 0x3f]; x1 += p1[x0 & 0x3f]; x2 += p1[x1 & 0x3f]; x3 += p1[x2 & 0x3f]; } } d[0] = (unsigned long)(x0 & 0xffff)|((unsigned long)(x1 & 0xffff) << 16L); d[1] = (unsigned long)(x2 & 0xffff)|((unsigned long)(x3 & 0xffff) << 16L); } LCRYPTO_ALIAS(RC2_encrypt); void RC2_decrypt(unsigned long *d, RC2_KEY *key) { int i, n; RC2_INT *p0, *p1; RC2_INT x0, x1, x2, x3, t; unsigned long l; l = d[0]; x0 = (RC2_INT)l & 0xffff; x1 = (RC2_INT)(l >> 16L); l = d[1]; x2 = (RC2_INT)l & 0xffff; x3 = (RC2_INT)(l >> 16L); n = 3; i = 5; p0 = &(key->data[63]); p1 = &(key->data[0]); for (;;) { t = ((x3 << 11)|(x3 >> 5)) & 0xffff; x3 = (t - (x0 & ~x2) - (x1 & x2) - *(p0--)) & 0xffff; t = ((x2 << 13)|(x2 >> 3)) & 0xffff; x2 = (t - (x3 & ~x1) - (x0 & x1) - *(p0--)) & 0xffff; t = ((x1 << 14)|(x1 >> 2)) & 0xffff; x1 = (t - (x2 & ~x0) - (x3 & x0) - *(p0--)) & 0xffff; t = ((x0 << 15)|(x0 >> 1)) & 0xffff; x0 = (t - (x1 & ~x3) - (x2 & x3) - *(p0--)) & 0xffff; if (--i == 0) { if (--n == 0) break; i = (n == 2) ? 6 : 5; x3 = (x3 - p1[x2 & 0x3f]) & 0xffff; x2 = (x2 - p1[x1 & 0x3f]) & 0xffff; x1 = (x1 - p1[x0 & 0x3f]) & 0xffff; x0 = (x0 - p1[x3 & 0x3f]) & 0xffff; } } d[0] = (unsigned long)(x0 & 0xffff)|((unsigned long)(x1 & 0xffff) << 16L); d[1] = (unsigned long)(x2 & 0xffff)|((unsigned long)(x3 & 0xffff) << 16L); } LCRYPTO_ALIAS(RC2_decrypt);