/* crypto/des/des_enc.c */

/* 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"

#include "spr.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

     * <71755.204@CompuServe.COM> for pointing this out.

     */

    /* clear the top bits on machines with 8byte longs */

    /* shift left by 2 */

    r = ROTATE(r, 29) & 0xffffffffL;

    l = ROTATE(l, 29) & 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 += 4) {

            D_ENCRYPT(l, r, i + 0); /* 1 */

            D_ENCRYPT(r, l, i + 2); /* 2 */

        }

#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 -= 4) {

            D_ENCRYPT(l, r, i - 0); /* 16 */

            D_ENCRYPT(r, l, i - 2); /* 15 */

        }

#endif

    }

    /* rotate and clear the top bits on machines with 8byte longs */

    l = ROTATE(l, 3) & 0xffffffffL;

    r = ROTATE(r, 3) & 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

     * <71755.204@CompuServe.COM> for pointing this out.

     */

    /* clear the top bits on machines with 8byte longs */

    r = ROTATE(r, 29) & 0xffffffffL;

    l = ROTATE(l, 29) & 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 += 4) {

            D_ENCRYPT(l, r, i + 0); /* 1 */

            D_ENCRYPT(r, l, i + 2); /* 2 */

        }

#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 -= 4) {

            D_ENCRYPT(l, r, i - 0); /* 16 */

            D_ENCRYPT(r, l, i - 2); /* 15 */

        }

#endif

    }

    /* rotate and clear the top bits on machines with 8byte longs */

    data[0] = ROTATE(l, 3) & 0xffffffffL;

    data[1] = ROTATE(r, 3) & 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 = &(*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 = &(*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 = &(*ivec)[0];

        l2c(xor0, iv);

        l2c(xor1, iv);

    }

    tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;

    tin[0] = tin[1] = 0;

}

#endif                          /* DES_DEFAULT_OPTIONS */