/*

 * 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_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, OPT_TRADITIONAL, OPT_CHECK, OPT_PUB_CHECK

} OPTION_CHOICE;

const 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, 's', "Input key"},

    {"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"},

    {"traditional", OPT_TRADITIONAL, '-',

     "Use traditional format for private keys"},

#ifndef OPENSSL_NO_ENGINE

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

#endif

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

    {"pubcheck", OPT_PUB_CHECK, '-', "Check public key consistency"},

    {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, traditional = 0, check = 0, pub_check = 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_ANY, &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_TRADITIONAL:

            traditional = 1;

            break;

        case OPT_CHECK:

            check = 1;

            break;

        case OPT_PUB_CHECK:

            pub_check = 1;

            break;

        case OPT_MD:

            if (!opt_cipher(opt_unknown(), &cipher))

                goto opthelp;

        }

    }

    argc = opt_num_rest();

    if (argc != 0)

        goto opthelp;

    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;

    }

    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 == NULL)

        goto end;

    if (check || pub_check) {

        int r;

        EVP_PKEY_CTX *ctx;

        ctx = EVP_PKEY_CTX_new(pkey, e);

        if (ctx == NULL) {

            ERR_print_errors(bio_err);

            goto end;

        }

        if (check)

            r = EVP_PKEY_check(ctx);

        else

            r = EVP_PKEY_public_check(ctx);

        if (r == 1) {

            BIO_printf(out, "Key is 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, "Key is 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) {

        if (outformat == FORMAT_PEM) {

            if (pubout) {

                if (!PEM_write_bio_PUBKEY(out, pkey))

                    goto end;

            } else {

                assert(private);

                if (traditional) {

                    if (!PEM_write_bio_PrivateKey_traditional(out, pkey, cipher,

                                                              NULL, 0, NULL,

                                                              passout))

                        goto end;

                } else {

                    if (!PEM_write_bio_PrivateKey(out, pkey, cipher,

                                                  NULL, 0, NULL, passout))

                        goto end;

                }

            }

        } else if (outformat == FORMAT_ASN1) {

            if (pubout) {

                if (!i2d_PUBKEY_bio(out, pkey))

                    goto end;

            } else {

                assert(private);

                if (!i2d_PrivateKey_bio(out, pkey))

                    goto end;

            }

        } else {

            BIO_printf(bio_err, "Bad format specified for key\n");

            goto end;

        }

    }

    if (text) {

        if (pubtext) {

            if (EVP_PKEY_print_public(out, pkey, 0, NULL) <= 0)

                goto end;

        } else {

            assert(private);

            if (EVP_PKEY_print_private(out, pkey, 0, NULL) <= 0)

                goto end;

        }

    }

    ret = 0;

 end:

    if (ret != 0)

        ERR_print_errors(bio_err);

    EVP_PKEY_free(pkey);

    release_engine(e);

    BIO_free_all(out);

    BIO_free(in);

    OPENSSL_free(passin);

    OPENSSL_free(passout);

    return ret;

}