/* crypto/dh/dhtest.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.]
 */

/*
 * Until the key-gen callbacks are modified to use newer prototypes, we allow
 * deprecated functions for openssl-internal code
 */
#ifdef OPENSSL_NO_DEPRECATED
# undef OPENSSL_NO_DEPRECATED
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "../e_os.h"

#include <openssl/crypto.h>
#include <openssl/bio.h>
#include <openssl/bn.h>
#include <openssl/rand.h>
#include <openssl/err.h>

#ifdef OPENSSL_NO_DH
int main(int argc, char *argv[])
{
    printf("No DH support\n");
    return (0);
}
#else
# include <openssl/dh.h>

# ifdef OPENSSL_SYS_WIN16
#  define MS_CALLBACK     _far _loadds
# else
#  define MS_CALLBACK
# endif

static int MS_CALLBACK cb(int p, int n, BN_GENCB *arg);

static const char rnd_seed[] =
    "string to make the random number generator think it has entropy";

int main(int argc, char *argv[])
{
    BN_GENCB _cb;
    DH *a;
    DH *b = NULL;
    char buf[12];
    unsigned char *abuf = NULL, *bbuf = NULL;
    int i, alen, blen, aout, bout, ret = 1;
    BIO *out;

    CRYPTO_malloc_debug_init();
    CRYPTO_dbg_set_options(V_CRYPTO_MDEBUG_ALL);
    CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);

# ifdef OPENSSL_SYS_WIN32
    CRYPTO_malloc_init();
# endif

    RAND_seed(rnd_seed, sizeof rnd_seed);

    out = BIO_new(BIO_s_file());
    if (out == NULL)
        EXIT(1);
    BIO_set_fp(out, stdout, BIO_NOCLOSE);

    BN_GENCB_set(&_cb, &cb, out);
    if (((a = DH_new()) == NULL) || !DH_generate_parameters_ex(a, 64,
                                                               DH_GENERATOR_5,
                                                               &_cb))
        goto err;

    if (!DH_check(a, &i))
        goto err;
    if (i & DH_CHECK_P_NOT_PRIME)
        BIO_puts(out, "p value is not prime\n");
    if (i & DH_CHECK_P_NOT_SAFE_PRIME)
        BIO_puts(out, "p value is not a safe prime\n");
    if (i & DH_UNABLE_TO_CHECK_GENERATOR)
        BIO_puts(out, "unable to check the generator value\n");
    if (i & DH_NOT_SUITABLE_GENERATOR)
        BIO_puts(out, "the g value is not a generator\n");

    BIO_puts(out, "\np    =");
    BN_print(out, a->p);
    BIO_puts(out, "\ng    =");
    BN_print(out, a->g);
    BIO_puts(out, "\n");

    b = DH_new();
    if (b == NULL)
        goto err;

    b->p = BN_dup(a->p);
    b->g = BN_dup(a->g);
    if ((b->p == NULL) || (b->g == NULL))
        goto err;

    /* Set a to run with normal modexp and b to use constant time */
    a->flags &= ~DH_FLAG_NO_EXP_CONSTTIME;
    b->flags |= DH_FLAG_NO_EXP_CONSTTIME;

    if (!DH_generate_key(a))
        goto err;
    BIO_puts(out, "pri 1=");
    BN_print(out, a->priv_key);
    BIO_puts(out, "\npub 1=");
    BN_print(out, a->pub_key);
    BIO_puts(out, "\n");

    if (!DH_generate_key(b))
        goto err;
    BIO_puts(out, "pri 2=");
    BN_print(out, b->priv_key);
    BIO_puts(out, "\npub 2=");
    BN_print(out, b->pub_key);
    BIO_puts(out, "\n");

    alen = DH_size(a);
    abuf = (unsigned char *)OPENSSL_malloc(alen);
    aout = DH_compute_key(abuf, b->pub_key, a);

    BIO_puts(out, "key1 =");
    for (i = 0; i < aout; i++) {
        sprintf(buf, "%02X", abuf[i]);
        BIO_puts(out, buf);
    }
    BIO_puts(out, "\n");

    blen = DH_size(b);
    bbuf = (unsigned char *)OPENSSL_malloc(blen);
    bout = DH_compute_key(bbuf, a->pub_key, b);

    BIO_puts(out, "key2 =");
    for (i = 0; i < bout; i++) {
        sprintf(buf, "%02X", bbuf[i]);
        BIO_puts(out, buf);
    }
    BIO_puts(out, "\n");
    if ((aout < 4) || (bout != aout) || (memcmp(abuf, bbuf, aout) != 0)) {
        fprintf(stderr, "Error in DH routines\n");
        ret = 1;
    } else
        ret = 0;
 err:
    ERR_print_errors_fp(stderr);

    if (abuf != NULL)
        OPENSSL_free(abuf);
    if (bbuf != NULL)
        OPENSSL_free(bbuf);
    if (b != NULL)
        DH_free(b);
    if (a != NULL)
        DH_free(a);
    BIO_free(out);
# ifdef OPENSSL_SYS_NETWARE
    if (ret)
        printf("ERROR: %d\n", ret);
# endif
    EXIT(ret);
    return (ret);
}

static int MS_CALLBACK cb(int p, int n, BN_GENCB *arg)
{
    char c = '*';

    if (p == 0)
        c = '.';
    if (p == 1)
        c = '+';
    if (p == 2)
        c = '*';
    if (p == 3)
        c = '\n';
    BIO_write(arg->arg, &c, 1);
    (void)BIO_flush(arg->arg);
# ifdef LINT
    p = n;
# endif
    return 1;
}
#endif
