229 lines
7.6 KiB
C
229 lines
7.6 KiB
C
/* crypto/rc2/rc2_cbc.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <openssl/rc2.h>
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#include "rc2_locl.h"
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void RC2_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
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RC2_KEY *ks, unsigned char *iv, int encrypt)
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{
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register unsigned long tin0, tin1;
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register unsigned long tout0, tout1, xor0, xor1;
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register long l = length;
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unsigned long tin[2];
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if (encrypt) {
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c2l(iv, tout0);
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c2l(iv, tout1);
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iv -= 8;
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for (l -= 8; l >= 0; l -= 8) {
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c2l(in, tin0);
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c2l(in, tin1);
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tin0 ^= tout0;
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tin1 ^= tout1;
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tin[0] = tin0;
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tin[1] = tin1;
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RC2_encrypt(tin, ks);
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tout0 = tin[0];
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l2c(tout0, out);
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tout1 = tin[1];
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l2c(tout1, out);
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}
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if (l != -8) {
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c2ln(in, tin0, tin1, l + 8);
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tin0 ^= tout0;
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tin1 ^= tout1;
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tin[0] = tin0;
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tin[1] = tin1;
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RC2_encrypt(tin, ks);
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tout0 = tin[0];
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l2c(tout0, out);
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tout1 = tin[1];
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l2c(tout1, out);
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}
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l2c(tout0, iv);
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l2c(tout1, iv);
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} else {
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c2l(iv, xor0);
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c2l(iv, xor1);
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iv -= 8;
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for (l -= 8; l >= 0; l -= 8) {
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c2l(in, tin0);
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tin[0] = tin0;
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c2l(in, tin1);
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tin[1] = tin1;
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RC2_decrypt(tin, ks);
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tout0 = tin[0] ^ xor0;
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tout1 = tin[1] ^ xor1;
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l2c(tout0, out);
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l2c(tout1, out);
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xor0 = tin0;
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xor1 = tin1;
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}
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if (l != -8) {
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c2l(in, tin0);
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tin[0] = tin0;
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c2l(in, tin1);
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tin[1] = tin1;
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RC2_decrypt(tin, ks);
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tout0 = tin[0] ^ xor0;
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tout1 = tin[1] ^ xor1;
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l2cn(tout0, tout1, out, l + 8);
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xor0 = tin0;
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xor1 = tin1;
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}
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l2c(xor0, iv);
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l2c(xor1, iv);
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}
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tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
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tin[0] = tin[1] = 0;
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}
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void RC2_encrypt(unsigned long *d, RC2_KEY *key)
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{
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int i, n;
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register RC2_INT *p0, *p1;
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register RC2_INT x0, x1, x2, x3, t;
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unsigned long l;
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l = d[0];
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x0 = (RC2_INT) l & 0xffff;
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x1 = (RC2_INT) (l >> 16L);
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l = d[1];
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x2 = (RC2_INT) l & 0xffff;
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x3 = (RC2_INT) (l >> 16L);
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n = 3;
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i = 5;
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p0 = p1 = &(key->data[0]);
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for (;;) {
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t = (x0 + (x1 & ~x3) + (x2 & x3) + *(p0++)) & 0xffff;
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x0 = (t << 1) | (t >> 15);
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t = (x1 + (x2 & ~x0) + (x3 & x0) + *(p0++)) & 0xffff;
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x1 = (t << 2) | (t >> 14);
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t = (x2 + (x3 & ~x1) + (x0 & x1) + *(p0++)) & 0xffff;
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x2 = (t << 3) | (t >> 13);
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t = (x3 + (x0 & ~x2) + (x1 & x2) + *(p0++)) & 0xffff;
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x3 = (t << 5) | (t >> 11);
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if (--i == 0) {
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if (--n == 0)
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break;
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i = (n == 2) ? 6 : 5;
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x0 += p1[x3 & 0x3f];
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x1 += p1[x0 & 0x3f];
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x2 += p1[x1 & 0x3f];
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x3 += p1[x2 & 0x3f];
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}
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}
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d[0] =
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(unsigned long)(x0 & 0xffff) | ((unsigned long)(x1 & 0xffff) << 16L);
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d[1] =
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(unsigned long)(x2 & 0xffff) | ((unsigned long)(x3 & 0xffff) << 16L);
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}
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void RC2_decrypt(unsigned long *d, RC2_KEY *key)
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{
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int i, n;
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register RC2_INT *p0, *p1;
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register RC2_INT x0, x1, x2, x3, t;
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unsigned long l;
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l = d[0];
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x0 = (RC2_INT) l & 0xffff;
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x1 = (RC2_INT) (l >> 16L);
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l = d[1];
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x2 = (RC2_INT) l & 0xffff;
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x3 = (RC2_INT) (l >> 16L);
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n = 3;
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i = 5;
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p0 = &(key->data[63]);
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p1 = &(key->data[0]);
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for (;;) {
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t = ((x3 << 11) | (x3 >> 5)) & 0xffff;
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x3 = (t - (x0 & ~x2) - (x1 & x2) - *(p0--)) & 0xffff;
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t = ((x2 << 13) | (x2 >> 3)) & 0xffff;
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x2 = (t - (x3 & ~x1) - (x0 & x1) - *(p0--)) & 0xffff;
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t = ((x1 << 14) | (x1 >> 2)) & 0xffff;
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x1 = (t - (x2 & ~x0) - (x3 & x0) - *(p0--)) & 0xffff;
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t = ((x0 << 15) | (x0 >> 1)) & 0xffff;
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x0 = (t - (x1 & ~x3) - (x2 & x3) - *(p0--)) & 0xffff;
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if (--i == 0) {
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if (--n == 0)
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break;
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i = (n == 2) ? 6 : 5;
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x3 = (x3 - p1[x2 & 0x3f]) & 0xffff;
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x2 = (x2 - p1[x1 & 0x3f]) & 0xffff;
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x1 = (x1 - p1[x0 & 0x3f]) & 0xffff;
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x0 = (x0 - p1[x3 & 0x3f]) & 0xffff;
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}
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}
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d[0] =
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(unsigned long)(x0 & 0xffff) | ((unsigned long)(x1 & 0xffff) << 16L);
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d[1] =
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(unsigned long)(x2 & 0xffff) | ((unsigned long)(x3 & 0xffff) << 16L);
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}
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