/* apps/dsaparam.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 <openssl/opensslconf.h> /* for OPENSSL_NO_DSA */
/*
 * 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

#ifndef OPENSSL_NO_DSA
# include <assert.h>
# include <stdio.h>
# include <stdlib.h>
# include <time.h>
# include <string.h>
# include "apps.h"
# include <openssl/bio.h>
# include <openssl/err.h>
# include <openssl/bn.h>
# include <openssl/dsa.h>
# include <openssl/x509.h>
# include <openssl/pem.h>

# undef PROG
# define PROG    dsaparam_main

/*-
 * -inform arg  - input format - default PEM (DER or PEM)
 * -outform arg - output format - default PEM
 * -in arg      - input file - default stdin
 * -out arg     - output file - default stdout
 * -noout
 * -text
 * -C
 * -noout
 * -genkey
 *  #ifdef GENCB_TEST
 * -timebomb n  - interrupt keygen after <n> seconds
 *  #endif
 */

# ifdef GENCB_TEST

static int stop_keygen_flag = 0;

static void timebomb_sigalarm(int foo)
{
    stop_keygen_flag = 1;
}

# endif

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

int MAIN(int, char **);

int MAIN(int argc, char **argv)
{
    DSA *dsa = NULL;
    int i, badops = 0, text = 0;
    BIO *in = NULL, *out = NULL;
    int informat, outformat, noout = 0, C = 0, ret = 1;
    char *infile, *outfile, *prog, *inrand = NULL;
    int numbits = -1, num, genkey = 0;
    int need_rand = 0;
# ifndef OPENSSL_NO_ENGINE
    char *engine = NULL;
# endif
# ifdef GENCB_TEST
    int timebomb = 0;
# endif

    apps_startup();

    if (bio_err == NULL)
        if ((bio_err = BIO_new(BIO_s_file())) != NULL)
            BIO_set_fp(bio_err, stderr, BIO_NOCLOSE | BIO_FP_TEXT);

    if (!load_config(bio_err, NULL))
        goto end;

    infile = NULL;
    outfile = NULL;
    informat = FORMAT_PEM;
    outformat = FORMAT_PEM;

    prog = argv[0];
    argc--;
    argv++;
    while (argc >= 1) {
        if (strcmp(*argv, "-inform") == 0) {
            if (--argc < 1)
                goto bad;
            informat = str2fmt(*(++argv));
        } else if (strcmp(*argv, "-outform") == 0) {
            if (--argc < 1)
                goto bad;
            outformat = str2fmt(*(++argv));
        } else if (strcmp(*argv, "-in") == 0) {
            if (--argc < 1)
                goto bad;
            infile = *(++argv);
        } else if (strcmp(*argv, "-out") == 0) {
            if (--argc < 1)
                goto bad;
            outfile = *(++argv);
        }
# ifndef OPENSSL_NO_ENGINE
        else if (strcmp(*argv, "-engine") == 0) {
            if (--argc < 1)
                goto bad;
            engine = *(++argv);
        }
# endif
# ifdef GENCB_TEST
        else if (strcmp(*argv, "-timebomb") == 0) {
            if (--argc < 1)
                goto bad;
            timebomb = atoi(*(++argv));
        }
# endif
        else if (strcmp(*argv, "-text") == 0)
            text = 1;
        else if (strcmp(*argv, "-C") == 0)
            C = 1;
        else if (strcmp(*argv, "-genkey") == 0) {
            genkey = 1;
            need_rand = 1;
        } else if (strcmp(*argv, "-rand") == 0) {
            if (--argc < 1)
                goto bad;
            inrand = *(++argv);
            need_rand = 1;
        } else if (strcmp(*argv, "-noout") == 0)
            noout = 1;
        else if (sscanf(*argv, "%d", &num) == 1) {
            /* generate a key */
            numbits = num;
            need_rand = 1;
        } else {
            BIO_printf(bio_err, "unknown option %s\n", *argv);
            badops = 1;
            break;
        }
        argc--;
        argv++;
    }

    if (badops) {
 bad:
        BIO_printf(bio_err, "%s [options] [bits] <infile >outfile\n", prog);
        BIO_printf(bio_err, "where options are\n");
        BIO_printf(bio_err, " -inform arg   input format - DER or PEM\n");
        BIO_printf(bio_err, " -outform arg  output format - DER or PEM\n");
        BIO_printf(bio_err, " -in arg       input file\n");
        BIO_printf(bio_err, " -out arg      output file\n");
        BIO_printf(bio_err, " -text         print as text\n");
        BIO_printf(bio_err, " -C            Output C code\n");
        BIO_printf(bio_err, " -noout        no output\n");
        BIO_printf(bio_err, " -genkey       generate a DSA key\n");
        BIO_printf(bio_err,
                   " -rand         files to use for random number input\n");
# ifndef OPENSSL_NO_ENGINE
        BIO_printf(bio_err,
                   " -engine e     use engine e, possibly a hardware device.\n");
# endif
# ifdef GENCB_TEST
        BIO_printf(bio_err,
                   " -timebomb n   interrupt keygen after <n> seconds\n");
# endif
        BIO_printf(bio_err,
                   " number        number of bits to use for generating private key\n");
        goto end;
    }

    ERR_load_crypto_strings();

    in = BIO_new(BIO_s_file());
    out = BIO_new(BIO_s_file());
    if ((in == NULL) || (out == NULL)) {
        ERR_print_errors(bio_err);
        goto end;
    }

    if (infile == NULL)
        BIO_set_fp(in, stdin, BIO_NOCLOSE);
    else {
        if (BIO_read_filename(in, infile) <= 0) {
            perror(infile);
            goto end;
        }
    }
    if (outfile == NULL) {
        BIO_set_fp(out, stdout, BIO_NOCLOSE);
# ifdef OPENSSL_SYS_VMS
        {
            BIO *tmpbio = BIO_new(BIO_f_linebuffer());
            out = BIO_push(tmpbio, out);
        }
# endif
    } else {
        if (BIO_write_filename(out, outfile) <= 0) {
            perror(outfile);
            goto end;
        }
    }

# ifndef OPENSSL_NO_ENGINE
    setup_engine(bio_err, engine, 0);
# endif

    if (need_rand) {
        app_RAND_load_file(NULL, bio_err, (inrand != NULL));
        if (inrand != NULL)
            BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
                       app_RAND_load_files(inrand));
    }

    if (numbits > 0) {
        BN_GENCB cb;
        BN_GENCB_set(&cb, dsa_cb, bio_err);
        assert(need_rand);
        dsa = DSA_new();
        if (!dsa) {
            BIO_printf(bio_err, "Error allocating DSA object\n");
            goto end;
        }
        BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n",
                   num);
        BIO_printf(bio_err, "This could take some time\n");
# ifdef GENCB_TEST
        if (timebomb > 0) {
            struct sigaction act;
            act.sa_handler = timebomb_sigalarm;
            act.sa_flags = 0;
            BIO_printf(bio_err,
                       "(though I'll stop it if not done within %d secs)\n",
                       timebomb);
            if (sigaction(SIGALRM, &act, NULL) != 0) {
                BIO_printf(bio_err, "Error, couldn't set SIGALRM handler\n");
                goto end;
            }
            alarm(timebomb);
        }
# endif
        if (!DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL, &cb)) {
# ifdef GENCB_TEST
            if (stop_keygen_flag) {
                BIO_printf(bio_err, "DSA key generation time-stopped\n");
                /* This is an asked-for behaviour! */
                ret = 0;
                goto end;
            }
# endif
            BIO_printf(bio_err, "Error, DSA key generation failed\n");
            goto end;
        }
    } else if (informat == FORMAT_ASN1)
        dsa = d2i_DSAparams_bio(in, NULL);
    else if (informat == FORMAT_PEM)
        dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
    else {
        BIO_printf(bio_err, "bad input format specified\n");
        goto end;
    }
    if (dsa == NULL) {
        BIO_printf(bio_err, "unable to load DSA parameters\n");
        ERR_print_errors(bio_err);
        goto end;
    }

    if (text) {
        DSAparams_print(out, dsa);
    }

    if (C) {
        unsigned char *data;
        int l, len, bits_p;

        len = BN_num_bytes(dsa->p);
        bits_p = BN_num_bits(dsa->p);
        data = (unsigned char *)OPENSSL_malloc(len + 20);
        if (data == NULL) {
            perror("OPENSSL_malloc");
            goto end;
        }
        l = BN_bn2bin(dsa->p, data);
        printf("static unsigned char dsa%d_p[]={", bits_p);
        for (i = 0; i < l; i++) {
            if ((i % 12) == 0)
                printf("\n\t");
            printf("0x%02X,", data[i]);
        }
        printf("\n\t};\n");

        l = BN_bn2bin(dsa->q, data);
        printf("static unsigned char dsa%d_q[]={", bits_p);
        for (i = 0; i < l; i++) {
            if ((i % 12) == 0)
                printf("\n\t");
            printf("0x%02X,", data[i]);
        }
        printf("\n\t};\n");

        l = BN_bn2bin(dsa->g, data);
        printf("static unsigned char dsa%d_g[]={", bits_p);
        for (i = 0; i < l; i++) {
            if ((i % 12) == 0)
                printf("\n\t");
            printf("0x%02X,", data[i]);
        }
        printf("\n\t};\n\n");

        printf("DSA *get_dsa%d()\n\t{\n", bits_p);
        printf("\tDSA *dsa;\n\n");
        printf("\tif ((dsa=DSA_new()) == NULL) return(NULL);\n");
        printf("\tdsa->p=BN_bin2bn(dsa%d_p,sizeof(dsa%d_p),NULL);\n",
               bits_p, bits_p);
        printf("\tdsa->q=BN_bin2bn(dsa%d_q,sizeof(dsa%d_q),NULL);\n",
               bits_p, bits_p);
        printf("\tdsa->g=BN_bin2bn(dsa%d_g,sizeof(dsa%d_g),NULL);\n",
               bits_p, bits_p);
        printf
            ("\tif ((dsa->p == NULL) || (dsa->q == NULL) || (dsa->g == NULL))\n");
        printf("\t\t{ DSA_free(dsa); return(NULL); }\n");
        printf("\treturn(dsa);\n\t}\n");
    }

    if (!noout) {
        if (outformat == FORMAT_ASN1)
            i = i2d_DSAparams_bio(out, dsa);
        else if (outformat == FORMAT_PEM)
            i = PEM_write_bio_DSAparams(out, dsa);
        else {
            BIO_printf(bio_err, "bad output format specified for outfile\n");
            goto end;
        }
        if (!i) {
            BIO_printf(bio_err, "unable to write DSA parameters\n");
            ERR_print_errors(bio_err);
            goto end;
        }
    }
    if (genkey) {
        DSA *dsakey;

        assert(need_rand);
        if ((dsakey = DSAparams_dup(dsa)) == NULL)
            goto end;
        if (!DSA_generate_key(dsakey))
            goto end;
        if (outformat == FORMAT_ASN1)
            i = i2d_DSAPrivateKey_bio(out, dsakey);
        else if (outformat == FORMAT_PEM)
            i = PEM_write_bio_DSAPrivateKey(out, dsakey, NULL, NULL, 0, NULL,
                                            NULL);
        else {
            BIO_printf(bio_err, "bad output format specified for outfile\n");
            goto end;
        }
        DSA_free(dsakey);
    }
    if (need_rand)
        app_RAND_write_file(NULL, bio_err);
    ret = 0;
 end:
    if (in != NULL)
        BIO_free(in);
    if (out != NULL)
        BIO_free_all(out);
    if (dsa != NULL)
        DSA_free(dsa);
    apps_shutdown();
    OPENSSL_EXIT(ret);
}

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

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

# if PEDANTIC
static void *dummy = &dummy;
# endif

#endif