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

# undef PROG
# define PROG    dsa_main

/*-
 * -inform arg  - input format - default PEM (one of DER, NET or PEM)
 * -outform arg - output format - default PEM
 * -in arg      - input file - default stdin
 * -out arg     - output file - default stdout
 * -des         - encrypt output if PEM format with DES in cbc mode
 * -des3        - encrypt output if PEM format
 * -idea        - encrypt output if PEM format
 * -aes128      - encrypt output if PEM format
 * -aes192      - encrypt output if PEM format
 * -aes256      - encrypt output if PEM format
 * -camellia128 - encrypt output if PEM format
 * -camellia192 - encrypt output if PEM format
 * -camellia256 - encrypt output if PEM format
 * -seed        - encrypt output if PEM format
 * -text        - print a text version
 * -modulus     - print the DSA public key
 */

int MAIN(int, char **);

int MAIN(int argc, char **argv)
{
    ENGINE *e = NULL;
    int ret = 1;
    DSA *dsa = NULL;
    int i, badops = 0;
    const EVP_CIPHER *enc = NULL;
    BIO *in = NULL, *out = NULL;
    int informat, outformat, text = 0, noout = 0;
    int pubin = 0, pubout = 0;
    char *infile, *outfile, *prog;
# ifndef OPENSSL_NO_ENGINE
    char *engine;
# endif
    char *passargin = NULL, *passargout = NULL;
    char *passin = NULL, *passout = NULL;
    int modulus = 0;

    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;

# ifndef OPENSSL_NO_ENGINE
    engine = NULL;
# endif
    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);
        } else if (strcmp(*argv, "-passin") == 0) {
            if (--argc < 1)
                goto bad;
            passargin = *(++argv);
        } else if (strcmp(*argv, "-passout") == 0) {
            if (--argc < 1)
                goto bad;
            passargout = *(++argv);
        }
# ifndef OPENSSL_NO_ENGINE
        else if (strcmp(*argv, "-engine") == 0) {
            if (--argc < 1)
                goto bad;
            engine = *(++argv);
        }
# endif
        else if (strcmp(*argv, "-noout") == 0)
            noout = 1;
        else if (strcmp(*argv, "-text") == 0)
            text = 1;
        else if (strcmp(*argv, "-modulus") == 0)
            modulus = 1;
        else if (strcmp(*argv, "-pubin") == 0)
            pubin = 1;
        else if (strcmp(*argv, "-pubout") == 0)
            pubout = 1;
        else if ((enc = EVP_get_cipherbyname(&(argv[0][1]))) == NULL) {
            BIO_printf(bio_err, "unknown option %s\n", *argv);
            badops = 1;
            break;
        }
        argc--;
        argv++;
    }

    if (badops) {
 bad:
        BIO_printf(bio_err, "%s [options] <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,
                   " -passin arg     input file pass phrase source\n");
        BIO_printf(bio_err, " -out arg        output file\n");
        BIO_printf(bio_err,
                   " -passout arg    output file pass phrase source\n");
# ifndef OPENSSL_NO_ENGINE
        BIO_printf(bio_err,
                   " -engine e       use engine e, possibly a hardware device.\n");
# endif
        BIO_printf(bio_err,
                   " -des            encrypt PEM output with cbc des\n");
        BIO_printf(bio_err,
                   " -des3           encrypt PEM output with ede cbc des using 168 bit key\n");
# ifndef OPENSSL_NO_IDEA
        BIO_printf(bio_err,
                   " -idea           encrypt PEM output with cbc idea\n");
# endif
# ifndef OPENSSL_NO_AES
        BIO_printf(bio_err, " -aes128, -aes192, -aes256\n");
        BIO_printf(bio_err,
                   "                 encrypt PEM output with cbc aes\n");
# endif
# ifndef OPENSSL_NO_CAMELLIA
        BIO_printf(bio_err, " -camellia128, -camellia192, -camellia256\n");
        BIO_printf(bio_err,
                   "                 encrypt PEM output with cbc camellia\n");
# endif
# ifndef OPENSSL_NO_SEED
        BIO_printf(bio_err,
                   " -seed           encrypt PEM output with cbc seed\n");
# endif
        BIO_printf(bio_err, " -text           print the key in text\n");
        BIO_printf(bio_err, " -noout          don't print key out\n");
        BIO_printf(bio_err, " -modulus        print the DSA public value\n");
        goto end;
    }

    ERR_load_crypto_strings();

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

    if (!app_passwd(bio_err, passargin, passargout, &passin, &passout)) {
        BIO_printf(bio_err, "Error getting passwords\n");
        goto end;
    }

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

    BIO_printf(bio_err, "read DSA key\n");
    {
        EVP_PKEY *pkey;
        if (pubin)
            pkey = load_pubkey(bio_err, infile, informat, 1,
                               passin, e, "Public Key");
        else
            pkey = load_key(bio_err, infile, informat, 1,
                            passin, e, "Private Key");

        if (pkey != NULL)
            dsa = pkey == NULL ? NULL : EVP_PKEY_get1_DSA(pkey);
        EVP_PKEY_free(pkey);
    }
    if (dsa == NULL) {
        BIO_printf(bio_err, "unable to load Key\n");
        ERR_print_errors(bio_err);
        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;
        }
    }

    if (text)
        if (!DSA_print(out, dsa, 0)) {
            perror(outfile);
            ERR_print_errors(bio_err);
            goto end;
        }

    if (modulus) {
        fprintf(stdout, "Public Key=");
        BN_print(out, dsa->pub_key);
        fprintf(stdout, "\n");
    }

    if (noout)
        goto end;
    BIO_printf(bio_err, "writing DSA key\n");
    if (outformat == FORMAT_ASN1) {
        if (pubin || pubout)
            i = i2d_DSA_PUBKEY_bio(out, dsa);
        else
            i = i2d_DSAPrivateKey_bio(out, dsa);
    } else if (outformat == FORMAT_PEM) {
        if (pubin || pubout)
            i = PEM_write_bio_DSA_PUBKEY(out, dsa);
        else
            i = PEM_write_bio_DSAPrivateKey(out, dsa, enc,
                                            NULL, 0, NULL, passout);
    } else {
        BIO_printf(bio_err, "bad output format specified for outfile\n");
        goto end;
    }
    if (!i) {
        BIO_printf(bio_err, "unable to write private key\n");
        ERR_print_errors(bio_err);
    } else
        ret = 0;
 end:
    if (in != NULL)
        BIO_free(in);
    if (out != NULL)
        BIO_free_all(out);
    if (dsa != NULL)
        DSA_free(dsa);
    if (passin)
        OPENSSL_free(passin);
    if (passout)
        OPENSSL_free(passout);
    apps_shutdown();
    OPENSSL_EXIT(ret);
}
#endif