/*

 * Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include <string.h>

#include "apps.h"

#include "progs.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_IN, OPT_OUT, OPT_TEXT, OPT_NOOUT,

    OPT_ENGINE, OPT_CHECK

} OPTION_CHOICE;

const OPTIONS pkeyparam_options[] = {

    {"help", OPT_HELP, '-', "Display this summary"},

    {"in", OPT_IN, '<', "Input file"},

    {"out", OPT_OUT, '>', "Output file"},

    {"text", OPT_TEXT, '-', "Print parameters as text"},

    {"noout", OPT_NOOUT, '-', "Don't output encoded parameters"},

#ifndef OPENSSL_NO_ENGINE

    {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},

#endif

    {"check", OPT_CHECK, '-', "Check key param consistency"},

    {NULL}

};

int pkeyparam_main(int argc, char **argv)

{

    ENGINE *e = NULL;

    BIO *in = NULL, *out = NULL;

    EVP_PKEY *pkey = NULL;

    int text = 0, noout = 0, ret = 1, check = 0;

    OPTION_CHOICE o;

    char *infile = NULL, *outfile = NULL, *prog;

    prog = opt_init(argc, argv, pkeyparam_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(pkeyparam_options);

            ret = 0;

            goto end;

        case OPT_IN:

            infile = opt_arg();

            break;

        case OPT_OUT:

            outfile = opt_arg();

            break;

        case OPT_ENGINE:

            e = setup_engine(opt_arg(), 0);

            break;

        case OPT_TEXT:

            text = 1;

            break;

        case OPT_NOOUT:

            noout = 1;

            break;

        case OPT_CHECK:

            check = 1;

            break;

        }

    }

    argc = opt_num_rest();

    if (argc != 0)

        goto opthelp;

    in = bio_open_default(infile, 'r', FORMAT_PEM);

    if (in == NULL)

        goto end;

    out = bio_open_default(outfile, 'w', FORMAT_PEM);

    if (out == NULL)

        goto end;

    pkey = PEM_read_bio_Parameters(in, NULL);

    if (pkey == NULL) {

        BIO_printf(bio_err, "Error reading parameters\n");

        ERR_print_errors(bio_err);

        goto end;

    }

    if (check) {

        int r;

        EVP_PKEY_CTX *ctx;

        ctx = EVP_PKEY_CTX_new(pkey, e);

        if (ctx == NULL) {

            ERR_print_errors(bio_err);

            goto end;

        }

        r = EVP_PKEY_param_check(ctx);

        if (r == 1) {

            BIO_printf(out, "Parameters are valid\n");

        } else {

            /*

             * Note: at least for RSA keys if this function returns

             * -1, there will be no error reasons.

             */

            unsigned long err;

            BIO_printf(out, "Parameters are invalid\n");

            while ((err = ERR_peek_error()) != 0) {

                BIO_printf(out, "Detailed error: %s\n",

                           ERR_reason_error_string(err));

                ERR_get_error(); /* remove err from error stack */

            }

        }

        EVP_PKEY_CTX_free(ctx);

    }

    if (!noout)

        PEM_write_bio_Parameters(out, pkey);

    if (text)

        EVP_PKEY_print_params(out, pkey, 0, NULL);

    ret = 0;

 end:

    EVP_PKEY_free(pkey);

    release_engine(e);

    BIO_free_all(out);

    BIO_free(in);

    return ret;

}