dsaparam.c

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/* apps/dsaparam.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([email protected]).
 * 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 ([email protected]).
 * 
 * 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 ([email protected])"
 *    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 ([email protected])"
 * 
 * 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