| /* crypto/des/ncbc_enc.c */ |
| /*- |
| * #included by: |
| * cbc_enc.c (DES_cbc_encrypt) |
| * des_enc.c (DES_ncbc_encrypt) |
| */ |
| /* 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 "des_locl.h" |
| |
| #ifdef CBC_ENC_C__DONT_UPDATE_IV |
| void DES_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, |
| DES_key_schedule *_schedule, DES_cblock *ivec, int enc) |
| #else |
| void DES_ncbc_encrypt(const unsigned char *in, unsigned char *out, |
| long length, DES_key_schedule *_schedule, |
| DES_cblock *ivec, int enc) |
| #endif |
| { |
| register DES_LONG tin0, tin1; |
| register DES_LONG tout0, tout1, xor0, xor1; |
| register long l = length; |
| DES_LONG tin[2]; |
| unsigned char *iv; |
| |
| iv = &(*ivec)[0]; |
| |
| if (enc) { |
| c2l(iv, tout0); |
| c2l(iv, tout1); |
| for (l -= 8; l >= 0; l -= 8) { |
| c2l(in, tin0); |
| c2l(in, tin1); |
| tin0 ^= tout0; |
| tin[0] = tin0; |
| tin1 ^= tout1; |
| tin[1] = tin1; |
| DES_encrypt1((DES_LONG *)tin, _schedule, DES_ENCRYPT); |
| tout0 = tin[0]; |
| l2c(tout0, out); |
| tout1 = tin[1]; |
| l2c(tout1, out); |
| } |
| if (l != -8) { |
| c2ln(in, tin0, tin1, l + 8); |
| tin0 ^= tout0; |
| tin[0] = tin0; |
| tin1 ^= tout1; |
| tin[1] = tin1; |
| DES_encrypt1((DES_LONG *)tin, _schedule, DES_ENCRYPT); |
| tout0 = tin[0]; |
| l2c(tout0, out); |
| tout1 = tin[1]; |
| l2c(tout1, out); |
| } |
| #ifndef CBC_ENC_C__DONT_UPDATE_IV |
| iv = &(*ivec)[0]; |
| l2c(tout0, iv); |
| l2c(tout1, iv); |
| #endif |
| } else { |
| c2l(iv, xor0); |
| c2l(iv, xor1); |
| for (l -= 8; l >= 0; l -= 8) { |
| c2l(in, tin0); |
| tin[0] = tin0; |
| c2l(in, tin1); |
| tin[1] = tin1; |
| DES_encrypt1((DES_LONG *)tin, _schedule, DES_DECRYPT); |
| 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; |
| DES_encrypt1((DES_LONG *)tin, _schedule, DES_DECRYPT); |
| tout0 = tin[0] ^ xor0; |
| tout1 = tin[1] ^ xor1; |
| l2cn(tout0, tout1, out, l + 8); |
| #ifndef CBC_ENC_C__DONT_UPDATE_IV |
| xor0 = tin0; |
| xor1 = tin1; |
| #endif |
| } |
| #ifndef CBC_ENC_C__DONT_UPDATE_IV |
| iv = &(*ivec)[0]; |
| l2c(xor0, iv); |
| l2c(xor1, iv); |
| #endif |
| } |
| tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; |
| tin[0] = tin[1] = 0; |
| } |