200 lines
6.8 KiB
C
200 lines
6.8 KiB
C
/* crypto/cast/c_enc.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/cast.h>
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#include "cast_lcl.h"
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void CAST_encrypt(CAST_LONG *data, const CAST_KEY *key)
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{
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register CAST_LONG l, r, t;
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const register CAST_LONG *k;
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k = &(key->data[0]);
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l = data[0];
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r = data[1];
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E_CAST(0, k, l, r, +, ^, -);
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E_CAST(1, k, r, l, ^, -, +);
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E_CAST(2, k, l, r, -, +, ^);
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E_CAST(3, k, r, l, +, ^, -);
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E_CAST(4, k, l, r, ^, -, +);
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E_CAST(5, k, r, l, -, +, ^);
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E_CAST(6, k, l, r, +, ^, -);
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E_CAST(7, k, r, l, ^, -, +);
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E_CAST(8, k, l, r, -, +, ^);
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E_CAST(9, k, r, l, +, ^, -);
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E_CAST(10, k, l, r, ^, -, +);
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E_CAST(11, k, r, l, -, +, ^);
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if (!key->short_key) {
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E_CAST(12, k, l, r, +, ^, -);
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E_CAST(13, k, r, l, ^, -, +);
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E_CAST(14, k, l, r, -, +, ^);
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E_CAST(15, k, r, l, +, ^, -);
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}
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data[1] = l & 0xffffffffL;
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data[0] = r & 0xffffffffL;
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}
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void CAST_decrypt(CAST_LONG *data, const CAST_KEY *key)
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{
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register CAST_LONG l, r, t;
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const register CAST_LONG *k;
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k = &(key->data[0]);
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l = data[0];
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r = data[1];
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if (!key->short_key) {
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E_CAST(15, k, l, r, +, ^, -);
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E_CAST(14, k, r, l, -, +, ^);
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E_CAST(13, k, l, r, ^, -, +);
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E_CAST(12, k, r, l, +, ^, -);
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}
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E_CAST(11, k, l, r, -, +, ^);
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E_CAST(10, k, r, l, ^, -, +);
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E_CAST(9, k, l, r, +, ^, -);
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E_CAST(8, k, r, l, -, +, ^);
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E_CAST(7, k, l, r, ^, -, +);
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E_CAST(6, k, r, l, +, ^, -);
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E_CAST(5, k, l, r, -, +, ^);
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E_CAST(4, k, r, l, ^, -, +);
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E_CAST(3, k, l, r, +, ^, -);
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E_CAST(2, k, r, l, -, +, ^);
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E_CAST(1, k, l, r, ^, -, +);
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E_CAST(0, k, r, l, +, ^, -);
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data[1] = l & 0xffffffffL;
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data[0] = r & 0xffffffffL;
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}
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void CAST_cbc_encrypt(const unsigned char *in, unsigned char *out,
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long length, const CAST_KEY *ks, unsigned char *iv,
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int enc)
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{
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register CAST_LONG tin0, tin1;
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register CAST_LONG tout0, tout1, xor0, xor1;
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register long l = length;
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CAST_LONG tin[2];
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if (enc) {
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n2l(iv, tout0);
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n2l(iv, tout1);
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iv -= 8;
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for (l -= 8; l >= 0; l -= 8) {
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n2l(in, tin0);
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n2l(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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CAST_encrypt(tin, ks);
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tout0 = tin[0];
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tout1 = tin[1];
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l2n(tout0, out);
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l2n(tout1, out);
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}
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if (l != -8) {
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n2ln(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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CAST_encrypt(tin, ks);
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tout0 = tin[0];
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tout1 = tin[1];
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l2n(tout0, out);
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l2n(tout1, out);
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}
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l2n(tout0, iv);
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l2n(tout1, iv);
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} else {
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n2l(iv, xor0);
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n2l(iv, xor1);
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iv -= 8;
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for (l -= 8; l >= 0; l -= 8) {
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n2l(in, tin0);
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n2l(in, tin1);
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tin[0] = tin0;
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tin[1] = tin1;
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CAST_decrypt(tin, ks);
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tout0 = tin[0] ^ xor0;
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tout1 = tin[1] ^ xor1;
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l2n(tout0, out);
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l2n(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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n2l(in, tin0);
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n2l(in, tin1);
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tin[0] = tin0;
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tin[1] = tin1;
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CAST_decrypt(tin, ks);
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tout0 = tin[0] ^ xor0;
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tout1 = tin[1] ^ xor1;
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l2nn(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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l2n(xor0, iv);
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l2n(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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