/*
 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
 * 2006
 */
/* ====================================================================
 * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
 *
 * 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 above 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 acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */
#include <stdio.h>
#include <string.h>
#include "apps.h"
#include <openssl/pem.h>
#include <openssl/err.h>
#include <openssl/evp.h>

typedef enum OPTION_choice {
    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
    OPT_INFORM, OPT_OUTFORM, OPT_PASSIN, OPT_PASSOUT, OPT_ENGINE,
    OPT_IN, OPT_OUT, OPT_PUBIN, OPT_PUBOUT, OPT_TEXT_PUB,
    OPT_TEXT, OPT_NOOUT, OPT_MD
} OPTION_CHOICE;

OPTIONS pkey_options[] = {
    {"help", OPT_HELP, '-', "Display this summary"},
    {"inform", OPT_INFORM, 'F', "Input format (DER or PEM)"},
    {"outform", OPT_OUTFORM, 'F', "Output format (DER or PEM)"},
    {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
    {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
    {"in", OPT_IN, '<', "Input file"},
    {"out", OPT_OUT, '>', "Output file"},
    {"pubin", OPT_PUBIN, '-',
     "Read public key from input (default is private key)"},
    {"pubout", OPT_PUBOUT, '-', "Output public key, not private"},
    {"text_pub", OPT_TEXT_PUB, '-', "Only output public key components"},
    {"text", OPT_TEXT, '-', "Output in plaintext as well"},
    {"noout", OPT_NOOUT, '-', "Don't output the key"},
    {"", OPT_MD, '-', "Any supported cipher"},
#ifndef OPENSSL_NO_ENGINE
    {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
#endif
    {NULL}
};

int pkey_main(int argc, char **argv)
{
    BIO *in = NULL, *out = NULL;
    ENGINE *e = NULL;
    EVP_PKEY *pkey = NULL;
    const EVP_CIPHER *cipher = NULL;
    char *infile = NULL, *outfile = NULL, *passin = NULL, *passout = NULL;
    char *passinarg = NULL, *passoutarg = NULL, *prog;
    OPTION_CHOICE o;
    int informat = FORMAT_PEM, outformat = FORMAT_PEM;
    int pubin = 0, pubout = 0, pubtext = 0, text = 0, noout = 0, ret = 1;
    int private = 0;

    prog = opt_init(argc, argv, pkey_options);
    while ((o = opt_next()) != OPT_EOF) {
        switch (o) {
        case OPT_EOF:
        case OPT_ERR:
 opthelp:
            BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
            goto end;
        case OPT_HELP:
            opt_help(pkey_options);
            ret = 0;
            goto end;
        case OPT_INFORM:
            if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
                goto opthelp;
            break;
        case OPT_OUTFORM:
            if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
                goto opthelp;
            break;
        case OPT_PASSIN:
            passinarg = opt_arg();
            break;
        case OPT_PASSOUT:
            passoutarg = opt_arg();
            break;
        case OPT_ENGINE:
            e = setup_engine(opt_arg(), 0);
            break;
        case OPT_IN:
            infile = opt_arg();
            break;
        case OPT_OUT:
            outfile = opt_arg();
            break;
        case OPT_PUBIN:
            pubin = pubout = pubtext = 1;
            break;
        case OPT_PUBOUT:
            pubout = 1;
            break;
        case OPT_TEXT_PUB:
            pubtext = text = 1;
            break;
        case OPT_TEXT:
            text = 1;
            break;
        case OPT_NOOUT:
            noout = 1;
            break;
        case OPT_MD:
            if (!opt_cipher(opt_unknown(), &cipher))
                goto opthelp;
        }
    }
    argc = opt_num_rest();
    argv = opt_rest();
    private = !noout && !pubout ? 1 : 0;
    if (text && !pubtext)
        private = 1;

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

    if (!app_load_modules(NULL))
        goto end;

    out = bio_open_owner(outfile, outformat, private);
    if (out == NULL)
        goto end;

    if (pubin)
        pkey = load_pubkey(infile, informat, 1, passin, e, "Public Key");
    else
        pkey = load_key(infile, informat, 1, passin, e, "key");
    if (!pkey)
        goto end;

    if (!noout) {
        if (outformat == FORMAT_PEM) {
            assert(private);
            if (pubout)
                PEM_write_bio_PUBKEY(out, pkey);
            else
                PEM_write_bio_PrivateKey(out, pkey, cipher,
                                         NULL, 0, NULL, passout);
        } else if (outformat == FORMAT_ASN1) {
            assert(private);
            if (pubout)
                i2d_PUBKEY_bio(out, pkey);
            else
                i2d_PrivateKey_bio(out, pkey);
        } else {
            BIO_printf(bio_err, "Bad format specified for key\n");
            goto end;
        }

    }

    if (text) {
        if (pubtext)
            EVP_PKEY_print_public(out, pkey, 0, NULL);
        else {
            assert(private);
            EVP_PKEY_print_private(out, pkey, 0, NULL);
        }
    }

    ret = 0;

 end:
    EVP_PKEY_free(pkey);
    BIO_free_all(out);
    BIO_free(in);
    OPENSSL_free(passin);
    OPENSSL_free(passout);

    return ret;
}