/*

 * Copyright 2002-2020 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 <openssl/opensslconf.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "apps.h"

#include "progs.h"

#include <openssl/bio.h>

#include <openssl/err.h>

#include <openssl/evp.h>

#include <openssl/pem.h>

static OPT_PAIR conv_forms[] = {

    {"compressed", POINT_CONVERSION_COMPRESSED},

    {"uncompressed", POINT_CONVERSION_UNCOMPRESSED},

    {"hybrid", POINT_CONVERSION_HYBRID},

    {NULL}

};

static OPT_PAIR param_enc[] = {

    {"named_curve", OPENSSL_EC_NAMED_CURVE},

    {"explicit", 0},

    {NULL}

};

typedef enum OPTION_choice {

    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,

    OPT_INFORM, OPT_OUTFORM, OPT_ENGINE, OPT_IN, OPT_OUT,

    OPT_NOOUT, OPT_TEXT, OPT_PARAM_OUT, OPT_PUBIN, OPT_PUBOUT,

    OPT_PASSIN, OPT_PASSOUT, OPT_PARAM_ENC, OPT_CONV_FORM, OPT_CIPHER,

    OPT_NO_PUBLIC, OPT_CHECK

} OPTION_CHOICE;

const OPTIONS ec_options[] = {

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

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

    {"inform", OPT_INFORM, 'f', "Input format - DER or PEM"},

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

    {"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"},

    {"noout", OPT_NOOUT, '-', "Don't print key out"},

    {"text", OPT_TEXT, '-', "Print the key"},

    {"param_out", OPT_PARAM_OUT, '-', "Print the elliptic curve parameters"},

    {"pubin", OPT_PUBIN, '-', "Expect a public key in input file"},

    {"pubout", OPT_PUBOUT, '-', "Output public key, not private"},

    {"no_public", OPT_NO_PUBLIC, '-', "exclude public key from private key"},

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

    {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},

    {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},

    {"param_enc", OPT_PARAM_ENC, 's',

     "Specifies the way the ec parameters are encoded"},

    {"conv_form", OPT_CONV_FORM, 's', "Specifies the point conversion form "},

    {"", OPT_CIPHER, '-', "Any supported cipher"},

#ifndef OPENSSL_NO_ENGINE

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

#endif

    {NULL}

};

int ec_main(int argc, char **argv)

{

    BIO *in = NULL, *out = NULL;

    ENGINE *e = NULL;

    EC_KEY *eckey = NULL;

    const EC_GROUP *group;

    const EVP_CIPHER *enc = NULL;

    point_conversion_form_t form = POINT_CONVERSION_UNCOMPRESSED;

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

    char *passin = NULL, *passout = NULL, *passinarg = NULL, *passoutarg = NULL;

    OPTION_CHOICE o;

    int asn1_flag = OPENSSL_EC_NAMED_CURVE, new_form = 0, new_asn1_flag = 0;

    int informat = FORMAT_PEM, outformat = FORMAT_PEM, text = 0, noout = 0;

    int pubin = 0, pubout = 0, param_out = 0, i, ret = 1, private = 0;

    int no_public = 0, check = 0;

    prog = opt_init(argc, argv, ec_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(ec_options);

            ret = 0;

            goto end;

        case OPT_INFORM:

            if (!opt_format(opt_arg(), OPT_FMT_ANY, &informat))

                goto opthelp;

            break;

        case OPT_IN:

            infile = opt_arg();

            break;

        case OPT_OUTFORM:

            if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))

                goto opthelp;

            break;

        case OPT_OUT:

            outfile = opt_arg();

            break;

        case OPT_NOOUT:

            noout = 1;

            break;

        case OPT_TEXT:

            text = 1;

            break;

        case OPT_PARAM_OUT:

            param_out = 1;

            break;

        case OPT_PUBIN:

            pubin = 1;

            break;

        case OPT_PUBOUT:

            pubout = 1;

            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_CIPHER:

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

                goto opthelp;

            break;

        case OPT_CONV_FORM:

            if (!opt_pair(opt_arg(), conv_forms, &i))

                goto opthelp;

            new_form = 1;

            form = i;

            break;

        case OPT_PARAM_ENC:

            if (!opt_pair(opt_arg(), param_enc, &i))

                goto opthelp;

            new_asn1_flag = 1;

            asn1_flag = i;

            break;

        case OPT_NO_PUBLIC:

            no_public = 1;

            break;

        case OPT_CHECK:

            check = 1;

            break;

        }

    }

    argc = opt_num_rest();

    if (argc != 0)

        goto opthelp;

    private = param_out || pubin || pubout ? 0 : 1;

    if (text && !pubin)

        private = 1;

    if (!app_passwd(passinarg, passoutarg, &passin, &passout)) {

        BIO_printf(bio_err, "Error getting passwords\n");

        goto end;

    }

    if (informat != FORMAT_ENGINE) {

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

        if (in == NULL)

            goto end;

    }

    BIO_printf(bio_err, "read EC key\n");

    if (informat == FORMAT_ASN1) {

        if (pubin)

            eckey = d2i_EC_PUBKEY_bio(in, NULL);

        else

            eckey = d2i_ECPrivateKey_bio(in, NULL);

    } else if (informat == FORMAT_ENGINE) {

        EVP_PKEY *pkey;

        if (pubin)

            pkey = load_pubkey(infile, informat, 1, passin, e, "Public Key");

        else

            pkey = load_key(infile, informat, 1, passin, e, "Private Key");

        if (pkey != NULL) {

            eckey = EVP_PKEY_get1_EC_KEY(pkey);

            EVP_PKEY_free(pkey);

        }

    } else {

        if (pubin)

            eckey = PEM_read_bio_EC_PUBKEY(in, NULL, NULL, NULL);

        else

            eckey = PEM_read_bio_ECPrivateKey(in, NULL, NULL, passin);

    }

    if (eckey == NULL) {

        BIO_printf(bio_err, "unable to load Key\n");

        ERR_print_errors(bio_err);

        goto end;

    }

    out = bio_open_owner(outfile, outformat, private);

    if (out == NULL)

        goto end;

    group = EC_KEY_get0_group(eckey);

    if (new_form)

        EC_KEY_set_conv_form(eckey, form);

    if (new_asn1_flag)

        EC_KEY_set_asn1_flag(eckey, asn1_flag);

    if (no_public)

        EC_KEY_set_enc_flags(eckey, EC_PKEY_NO_PUBKEY);

    if (text) {

        assert(pubin || private);

        if (!EC_KEY_print(out, eckey, 0)) {

            perror(outfile);

            ERR_print_errors(bio_err);

            goto end;

        }

    }

    if (check) {

        if (EC_KEY_check_key(eckey) == 1) {

            BIO_printf(bio_err, "EC Key valid.\n");

        } else {

            BIO_printf(bio_err, "EC Key Invalid!\n");

            ERR_print_errors(bio_err);

        }

    }

    if (noout) {

        ret = 0;

        goto end;

    }

    BIO_printf(bio_err, "writing EC key\n");

    if (outformat == FORMAT_ASN1) {

        if (param_out) {

            i = i2d_ECPKParameters_bio(out, group);

        } else if (pubin || pubout) {

            i = i2d_EC_PUBKEY_bio(out, eckey);

        } else {

            assert(private);

            i = i2d_ECPrivateKey_bio(out, eckey);

        }

    } else {

        if (param_out) {

            i = PEM_write_bio_ECPKParameters(out, group);

        } else if (pubin || pubout) {

            i = PEM_write_bio_EC_PUBKEY(out, eckey);

        } else {

            assert(private);

            i = PEM_write_bio_ECPrivateKey(out, eckey, enc,

                                           NULL, 0, NULL, passout);

        }

    }

    if (!i) {

        BIO_printf(bio_err, "unable to write private key\n");

        ERR_print_errors(bio_err);

    } else {

        ret = 0;

    }

 end:

    BIO_free(in);

    BIO_free_all(out);

    EC_KEY_free(eckey);

    release_engine(e);

    OPENSSL_free(passin);

    OPENSSL_free(passout);

    return ret;

}