/* crypto/mdc2/mdc2dgst.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 <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <openssl/crypto.h>

#include <openssl/des.h>

#include <openssl/mdc2.h>

#undef c2l

#define c2l(c,l)        (l =((DES_LONG)(*((c)++)))    , \

                         l|=((DES_LONG)(*((c)++)))<< 8L, \

                         l|=((DES_LONG)(*((c)++)))<<16L, \

                         l|=((DES_LONG)(*((c)++)))<<24L)

#undef l2c

#define l2c(l,c)        (*((c)++)=(unsigned char)(((l)     )&0xff), \

                        *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \

                        *((c)++)=(unsigned char)(((l)>>16L)&0xff), \

                        *((c)++)=(unsigned char)(((l)>>24L)&0xff))

static void mdc2_body(MDC2_CTX *c, const unsigned char *in, size_t len);

fips_md_init(MDC2)

{

    c->num = 0;

    c->pad_type = 1;

    memset(&(c->h[0]), 0x52, MDC2_BLOCK);

    memset(&(c->hh[0]), 0x25, MDC2_BLOCK);

    return 1;

}

int MDC2_Update(MDC2_CTX *c, const unsigned char *in, size_t len)

{

    size_t i, j;

    i = c->num;

    if (i != 0) {

        if (len < MDC2_BLOCK - i) {

            /* partial block */

            memcpy(&(c->data[i]), in, len);

            c->num += (int)len;

            return 1;

        } else {

            /* filled one */

            j = MDC2_BLOCK - i;

            memcpy(&(c->data[i]), in, j);

            len -= j;

            in += j;

            c->num = 0;

            mdc2_body(c, &(c->data[0]), MDC2_BLOCK);

        }

    }

    i = len & ~((size_t)MDC2_BLOCK - 1);

    if (i > 0)

        mdc2_body(c, in, i);

    j = len - i;

    if (j > 0) {

        memcpy(&(c->data[0]), &(in[i]), j);

        c->num = (int)j;

    }

    return 1;

}

static void mdc2_body(MDC2_CTX *c, const unsigned char *in, size_t len)

{

    register DES_LONG tin0, tin1;

    register DES_LONG ttin0, ttin1;

    DES_LONG d[2], dd[2];

    DES_key_schedule k;

    unsigned char *p;

    size_t i;

    for (i = 0; i < len; i += 8) {

        c2l(in, tin0);

        d[0] = dd[0] = tin0;

        c2l(in, tin1);

        d[1] = dd[1] = tin1;

        c->h[0] = (c->h[0] & 0x9f) | 0x40;

        c->hh[0] = (c->hh[0] & 0x9f) | 0x20;

        DES_set_odd_parity(&c->h);

        DES_set_key_unchecked(&c->h, &k);

        DES_encrypt1(d, &k, 1);

        DES_set_odd_parity(&c->hh);

        DES_set_key_unchecked(&c->hh, &k);

        DES_encrypt1(dd, &k, 1);

        ttin0 = tin0 ^ dd[0];

        ttin1 = tin1 ^ dd[1];

        tin0 ^= d[0];

        tin1 ^= d[1];

        p = c->h;

        l2c(tin0, p);

        l2c(ttin1, p);

        p = c->hh;

        l2c(ttin0, p);

        l2c(tin1, p);

    }

}

int MDC2_Final(unsigned char *md, MDC2_CTX *c)

{

    unsigned int i;

    int j;

    i = c->num;

    j = c->pad_type;

    if ((i > 0) || (j == 2)) {

        if (j == 2)

            c->data[i++] = 0x80;

        memset(&(c->data[i]), 0, MDC2_BLOCK - i);

        mdc2_body(c, c->data, MDC2_BLOCK);

    }

    memcpy(md, (char *)c->h, MDC2_BLOCK);

    memcpy(&(md[MDC2_BLOCK]), (char *)c->hh, MDC2_BLOCK);

    return 1;

}

#undef TEST

#ifdef TEST

main()

{

    unsigned char md[MDC2_DIGEST_LENGTH];

    int i;

    MDC2_CTX c;

    static char *text = "Now is the time for all ";

    MDC2_Init(&c);

    MDC2_Update(&c, text, strlen(text));

    MDC2_Final(&(md[0]), &c);

    for (i = 0; i < MDC2_DIGEST_LENGTH; i++)

        printf("%02X", md[i]);

    printf("\n");

}

#endif