ecb_enc.c

3des加解密算法实现

/* crypto/des/ecb_enc.c */
/* Copyright (C) 1995-1998 Eric Young ([e-mail])
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young ([e-mail]).
* 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 ([e-mail]).
* 
* 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 ([e-mail])"
* 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 ([e-mail])"
* 
* 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"
//#include "des_ver.h"
//#include "spr.h"
//#include <openssl/opensslv.h>
//#include "bio.h"

//OPENSSL_GLOBAL const char *libdes_version="libdes" OPENSSL_VERSION_PTEXT;
//OPENSSL_GLOBAL const char *DES_version="DES" OPENSSL_VERSION_PTEXT;

const char *DES_options(void)
{
static int init=1;
static char buf[32];

if (init)
{
const char *ptr,*unroll,*risc,*size;

#ifdef DES_PTR
ptr="ptr";
#else
ptr="idx";
#endif
#if defined(DES_RISC1) || defined(DES_RISC2)
#ifdef DES_RISC1
risc="risc1";
#endif
#ifdef DES_RISC2
risc="risc2";
#endif
#else
risc="cisc";
#endif
#ifdef DES_UNROLL
unroll="16";
#else
unroll="4";
#endif
if (sizeof(DES_LONG) != sizeof(long))
size="int";
else
size="long";
//(buf,sizeof buf,"des(>s,>s,>s,>s)",ptr,risc,unroll,
// size);
init=0;
}
return(buf);
}


void DES_ecb_encrypt(const_DES_cblock *input, DES_cblock *output,
DES_key_schedule *ks, int enc)
{
register DES_LONG l;
DES_LONG ll[2];
const unsigned char *in = &amt;(*input)[0];
unsigned char *out = &amt;(*output)[0];

c2l(in,l); ll[0]=l;
c2l(in,l); ll[1]=l;
DES_encrypt1(ll,ks,enc);
l=ll[0]; l2c(l,out);
l=ll[1]; l2c(l,out);
l=ll[0]=ll[1]=0;
}