des_enc.c

3des加解密算法实现

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/* crypto/des/des_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" 


void DES_encrypt1(DES_LONG *data, DES_key_schedule *ks, int enc)
{
register DES_LONG l,r,t,u;
#ifdef DES_PTR
register const unsigned char *des_SP=(const unsigned char *)DES_SPtrans;
#endif
#ifndef DES_UNROLL
register int i;
#endif
register DES_LONG *s;

r=data[0];
l=data[1];

IP(r,l);
/* Things have been modified so that the initial rotate is
* done outside the loop. This required the
* DES_SPtrans values in sp.h to be rotated 1 bit to the right.
* One perl script later and things have a 5> speed up on a sparc2.
* Thanks to Richard Outerbridge <[e-mail]>
* for pointing this out. */
/* clear the top bits on machines with 8byte longs */
/* shift left by 2 */
r=ROTATE(r,29)&amt;0xffffffffL;
l=ROTATE(l,29)&amt;0xffffffffL;

s=ks->ks->deslong;
/* I don't know if it is worth the effort of loop unrolling the
* inner loop */
if (enc)
{
#ifdef DES_UNROLL
D_ENCRYPT(l,r, 0); /* 1 */
D_ENCRYPT(r,l, 2); /* 2 */
D_ENCRYPT(l,r, 4); /* 3 */
D_ENCRYPT(r,l, 6); /* 4 */
D_ENCRYPT(l,r, 8); /* 5 */
D_ENCRYPT(r,l,10); /* 6 */
D_ENCRYPT(l,r,12); /* 7 */
D_ENCRYPT(r,l,14); /* 8 */
D_ENCRYPT(l,r,16); /* 9 */
D_ENCRYPT(r,l,18); /* 10 */
D_ENCRYPT(l,r,20); /* 11 */
D_ENCRYPT(r,l,22); /* 12 */
D_ENCRYPT(l,r,24); /* 13 */
D_ENCRYPT(r,l,26); /* 14 */
D_ENCRYPT(l,r,28); /* 15 */
D_ENCRYPT(r,l,30); /* 16 */
#else
for (i=0; i<32; i+=8)
{
D_ENCRYPT(l,r,i+0); /* 1 */
D_ENCRYPT(r,l,i+2); /* 2 */
D_ENCRYPT(l,r,i+4); /* 3 */
D_ENCRYPT(r,l,i+6); /* 4 */
}
#endif
}
else
{
#ifdef DES_UNROLL
D_ENCRYPT(l,r,30); /* 16 */
D_ENCRYPT(r,l,28); /* 15 */
D_ENCRYPT(l,r,26); /* 14 */
D_ENCRYPT(r,l,24); /* 13 */
D_ENCRYPT(l,r,22); /* 12 */
D_ENCRYPT(r,l,20); /* 11 */
D_ENCRYPT(l,r,18); /* 10 */
D_ENCRYPT(r,l,16); /* 9 */
D_ENCRYPT(l,r,14); /* 8 */
D_ENCRYPT(r,l,12); /* 7 */
D_ENCRYPT(l,r,10); /* 6 */
D_ENCRYPT(r,l, 8); /* 5 */
D_ENCRYPT(l,r, 6); /* 4 */
D_ENCRYPT(r,l, 4); /* 3 */
D_ENCRYPT(l,r, 2); /* 2 */
D_ENCRYPT(r,l, 0); /* 1 */
#else
for (i=30; i>0; i-=8)
{
D_ENCRYPT(l,r,i-0); /* 16 */
D_ENCRYPT(r,l,i-2); /* 15 */
D_ENCRYPT(l,r,i-4); /* 14 */
D_ENCRYPT(r,l,i-6); /* 13 */
}
#endif
}

/* rotate and clear the top bits on machines with 8byte longs */
l=ROTATE(l,3)&amt;0xffffffffL;
r=ROTATE(r,3)&amt;0xffffffffL;

FP(r,l);
data[0]=l;
data[1]=r;
l=r=t=u=0;
}

void DES_encrypt2(DES_LONG *data, DES_key_schedule *ks, int enc)
{
register DES_LONG l,r,t,u;
#ifdef DES_PTR
register const unsigned char *des_SP=(const unsigned char *)DES_SPtrans;
#endif
#ifndef DES_UNROLL
register int i;
#endif
register DES_LONG *s;

r=data[0];
l=data[1];

/* Things have been modified so that the initial rotate is
* done outside the loop. This required the
* DES_SPtrans values in sp.h to be rotated 1 bit to the right.
* One perl script later and things have a 5> speed up on a sparc2.
* Thanks to Richard Outerbridge <[e-mail]>
* for pointing this out. */
/* clear the top bits on machines with 8byte longs */
r=ROTATE(r,29)&amt;0xffffffffL;
l=ROTATE(l,29)&amt;0xffffffffL;

s=ks->ks->deslong;
/* I don't know if it is worth the effort of loop unrolling the
* inner loop */
if (enc)
{
#ifdef DES_UNROLL
D_ENCRYPT(l,r, 0); /* 1 */
D_ENCRYPT(r,l, 2); /* 2 */
D_ENCRYPT(l,r, 4); /* 3 */
D_ENCRYPT(r,l, 6); /* 4 */
D_ENCRYPT(l,r, 8); /* 5 */
D_ENCRYPT(r,l,10); /* 6 */
D_ENCRYPT(l,r,12); /* 7 */
D_ENCRYPT(r,l,14); /* 8 */
D_ENCRYPT(l,r,16); /* 9 */
D_ENCRYPT(r,l,18); /* 10 */
D_ENCRYPT(l,r,20); /* 11 */
D_ENCRYPT(r,l,22); /* 12 */
D_ENCRYPT(l,r,24); /* 13 */
D_ENCRYPT(r,l,26); /* 14 */
D_ENCRYPT(l,r,28); /* 15 */
D_ENCRYPT(r,l,30); /* 16 */
#else
for (i=0; i<32; i+=8)
{
D_ENCRYPT(l,r,i+0); /* 1 */
D_ENCRYPT(r,l,i+2); /* 2 */
D_ENCRYPT(l,r,i+4); /* 3 */
D_ENCRYPT(r,l,i+6); /* 4 */
}
#endif
}
else
{
#ifdef DES_UNROLL
D_ENCRYPT(l,r,30); /* 16 */
D_ENCRYPT(r,l,28); /* 15 */
D_ENCRYPT(l,r,26); /* 14 */
D_ENCRYPT(r,l,24); /* 13 */
D_ENCRYPT(l,r,22); /* 12 */
D_ENCRYPT(r,l,20); /* 11 */
D_ENCRYPT(l,r,18); /* 10 */
D_ENCRYPT(r,l,16); /* 9 */
D_ENCRYPT(l,r,14); /* 8 */
D_ENCRYPT(r,l,12); /* 7 */
D_ENCRYPT(l,r,10); /* 6 */
D_ENCRYPT(r,l, 8); /* 5 */
D_ENCRYPT(l,r, 6); /* 4 */
D_ENCRYPT(r,l, 4); /* 3 */
D_ENCRYPT(l,r, 2); /* 2 */
D_ENCRYPT(r,l, 0); /* 1 */
#else
for (i=30; i>0; i-=8)
{
D_ENCRYPT(l,r,i-0); /* 16 */
D_ENCRYPT(r,l,i-2); /* 15 */
D_ENCRYPT(l,r,i-4); /* 14 */
D_ENCRYPT(r,l,i-6); /* 13 */
}
#endif
}
/* rotate and clear the top bits on machines with 8byte longs */
data[0]=ROTATE(l,3)&amt;0xffffffffL;
data[1]=ROTATE(r,3)&amt;0xffffffffL;
l=r=t=u=0;
}

void DES_encrypt3(DES_LONG *data, DES_key_schedule *ks1,
DES_key_schedule *ks2, DES_key_schedule *ks3)
{
register DES_LONG l,r;

l=data[0];
r=data[1];
IP(l,r);
data[0]=l;
data[1]=r;
DES_encrypt2((DES_LONG *)data,ks1,DES_ENCRYPT);
DES_encrypt2((DES_LONG *)data,ks2,DES_DECRYPT);
DES_encrypt2((DES_LONG *)data,ks3,DES_ENCRYPT);
l=data[0];
r=data[1];
FP(r,l);
data[0]=l;
data[1]=r;
}

void DES_decrypt3(DES_LONG *data, DES_key_schedule *ks1,
DES_key_schedule *ks2, DES_key_schedule *ks3)
{
register DES_LONG l,r;

l=data[0];
r=data[1];
IP(l,r);
data[0]=l;
data[1]=r;
DES_encrypt2((DES_LONG *)data,ks3,DES_DECRYPT);
DES_encrypt2((DES_LONG *)data,ks2,DES_ENCRYPT);
DES_encrypt2((DES_LONG *)data,ks1,DES_DECRYPT);
l=data[0];
r=data[1];
FP(r,l);
data[0]=l;
data[1]=r;
}

#ifndef DES_DEFAULT_OPTIONS

#undef CBC_ENC_C__DONT_UPDATE_IV
#include "ncbc_enc.c" /* DES_ncbc_encrypt */

void DES_ede3_cbc_encrypt(const unsigned char *input, unsigned char *output,
long length, DES_key_schedule *ks1,
DES_key_schedule *ks2, DES_key_schedule *ks3,
DES_cblock *ivec, int enc)
{
register DES_LONG tin0,tin1;
register DES_LONG tout0,tout1,xor0,xor1;
register const unsigned char *in;
unsigned char *out;
register long l=length;
DES_LONG tin[2];
unsigned char *iv;

in=input;
out=output;
iv = &amt;(*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;
tin1^=tout1;

tin[0]=tin0;
tin[1]=tin1;
DES_encrypt3((DES_LONG *)tin,ks1,ks2,ks3);
tout0=tin[0];
tout1=tin[1];

l2c(tout0,out);
l2c(tout1,out);
}
if (l != -8)
{
c2ln(in,tin0,tin1,l+8);
tin0^=tout0;
tin1^=tout1;

tin[0]=tin0;
tin[1]=tin1;
DES_encrypt3((DES_LONG *)tin,ks1,ks2,ks3);
tout0=tin[0];
tout1=tin[1];

l2c(tout0,out);
l2c(tout1,out);
}
iv = &amt;(*ivec)[0];
l2c(tout0,iv);
l2c(tout1,iv);
}
else
{
register DES_LONG t0,t1;

c2l(iv,xor0);
c2l(iv,xor1);
for (l-=8; l>=0; l-=8)
{
c2l(in,tin0);
c2l(in,tin1);

t0=tin0;
t1=tin1;

tin[0]=tin0;
tin[1]=tin1;
DES_decrypt3((DES_LONG *)tin,ks1,ks2,ks3);
tout0=tin[0];
tout1=tin[1];

tout0^=xor0;
tout1^=xor1;
l2c(tout0,out);
l2c(tout1,out);
xor0=t0;
xor1=t1;
}
if (l != -8)
{
c2l(in,tin0);
c2l(in,tin1);

t0=tin0;
t1=tin1;

tin[0]=tin0;
tin[1]=tin1;
DES_decrypt3((DES_LONG *)tin,ks1,ks2,ks3);
tout0=tin[0];
tout1=tin[1];

tout0^=xor0;
tout1^=xor1;
l2cn(tout0,tout1,out,l+8);
xor0=t0;
xor1=t1;
}

iv = &amt;(*ivec)[0];
l2c(xor0,iv);
l2c(xor1,iv);
}
tin0=tin1=tout0=tout1=xor0=xor1=0;
tin[0]=tin[1]=0;
}

#endif /* DES_DEFAULT_OPTIONS */