/*

 * Copyright 2000-2020 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 "apps.h"

#include "progs.h"

#include <string.h>

#include <openssl/err.h>

#include <openssl/pem.h>

#include <openssl/rsa.h>

#define RSA_SIGN        1

#define RSA_VERIFY      2

#define RSA_ENCRYPT     3

#define RSA_DECRYPT     4

#define KEY_PRIVKEY     1

#define KEY_PUBKEY      2

#define KEY_CERT        3

typedef enum OPTION_choice {

    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,

    OPT_ENGINE, OPT_IN, OPT_OUT, OPT_ASN1PARSE, OPT_HEXDUMP,

    OPT_RAW, OPT_OAEP, OPT_SSL, OPT_PKCS, OPT_X931,

    OPT_SIGN, OPT_VERIFY, OPT_REV, OPT_ENCRYPT, OPT_DECRYPT,

    OPT_PUBIN, OPT_CERTIN, OPT_INKEY, OPT_PASSIN, OPT_KEYFORM,

    OPT_R_ENUM

} OPTION_CHOICE;

const OPTIONS rsautl_options[] = {

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

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

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

    {"inkey", OPT_INKEY, 's', "Input key"},

    {"keyform", OPT_KEYFORM, 'E', "Private key format - default PEM"},

    {"pubin", OPT_PUBIN, '-', "Input is an RSA public"},

    {"certin", OPT_CERTIN, '-', "Input is a cert carrying an RSA public key"},

    {"ssl", OPT_SSL, '-', "Use SSL v2 padding"},

    {"raw", OPT_RAW, '-', "Use no padding"},

    {"pkcs", OPT_PKCS, '-', "Use PKCS#1 v1.5 padding (default)"},

    {"oaep", OPT_OAEP, '-', "Use PKCS#1 OAEP"},

    {"sign", OPT_SIGN, '-', "Sign with private key"},

    {"verify", OPT_VERIFY, '-', "Verify with public key"},

    {"asn1parse", OPT_ASN1PARSE, '-',

     "Run output through asn1parse; useful with -verify"},

    {"hexdump", OPT_HEXDUMP, '-', "Hex dump output"},

    {"x931", OPT_X931, '-', "Use ANSI X9.31 padding"},

    {"rev", OPT_REV, '-', "Reverse the order of the input buffer"},

    {"encrypt", OPT_ENCRYPT, '-', "Encrypt with public key"},

    {"decrypt", OPT_DECRYPT, '-', "Decrypt with private key"},

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

    OPT_R_OPTIONS,

#ifndef OPENSSL_NO_ENGINE

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

#endif

    {NULL}

};

int rsautl_main(int argc, char **argv)

{

    BIO *in = NULL, *out = NULL;

    ENGINE *e = NULL;

    EVP_PKEY *pkey = NULL;

    RSA *rsa = NULL;

    X509 *x;

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

    char *passinarg = NULL, *passin = NULL, *prog;

    char rsa_mode = RSA_VERIFY, key_type = KEY_PRIVKEY;

    unsigned char *rsa_in = NULL, *rsa_out = NULL, pad = RSA_PKCS1_PADDING;

    int rsa_inlen, keyformat = FORMAT_PEM, keysize, ret = 1;

    int rsa_outlen = 0, hexdump = 0, asn1parse = 0, need_priv = 0, rev = 0;

    OPTION_CHOICE o;

    prog = opt_init(argc, argv, rsautl_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(rsautl_options);

            ret = 0;

            goto end;

        case OPT_KEYFORM:

            if (!opt_format(opt_arg(), OPT_FMT_PDE, &keyformat))

                goto opthelp;

            break;

        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_ASN1PARSE:

            asn1parse = 1;

            break;

        case OPT_HEXDUMP:

            hexdump = 1;

            break;

        case OPT_RAW:

            pad = RSA_NO_PADDING;

            break;

        case OPT_OAEP:

            pad = RSA_PKCS1_OAEP_PADDING;

            break;

        case OPT_SSL:

            pad = RSA_SSLV23_PADDING;

            break;

        case OPT_PKCS:

            pad = RSA_PKCS1_PADDING;

            break;

        case OPT_X931:

            pad = RSA_X931_PADDING;

            break;

        case OPT_SIGN:

            rsa_mode = RSA_SIGN;

            need_priv = 1;

            break;

        case OPT_VERIFY:

            rsa_mode = RSA_VERIFY;

            break;

        case OPT_REV:

            rev = 1;

            break;

        case OPT_ENCRYPT:

            rsa_mode = RSA_ENCRYPT;

            break;

        case OPT_DECRYPT:

            rsa_mode = RSA_DECRYPT;

            need_priv = 1;

            break;

        case OPT_PUBIN:

            key_type = KEY_PUBKEY;

            break;

        case OPT_CERTIN:

            key_type = KEY_CERT;

            break;

        case OPT_INKEY:

            keyfile = opt_arg();

            break;

        case OPT_PASSIN:

            passinarg = opt_arg();

            break;

        case OPT_R_CASES:

            if (!opt_rand(o))

                goto end;

            break;

        }

    }

    argc = opt_num_rest();

    if (argc != 0)

        goto opthelp;

    if (need_priv && (key_type != KEY_PRIVKEY)) {

        BIO_printf(bio_err, "A private key is needed for this operation\n");

        goto end;

    }

    if (!app_passwd(passinarg, NULL, &passin, NULL)) {

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

        goto end;

    }

    switch (key_type) {

    case KEY_PRIVKEY:

        pkey = load_key(keyfile, keyformat, 0, passin, e, "Private Key");

        break;

    case KEY_PUBKEY:

        pkey = load_pubkey(keyfile, keyformat, 0, NULL, e, "Public Key");

        break;

    case KEY_CERT:

        x = load_cert(keyfile, keyformat, "Certificate");

        if (x) {

            pkey = X509_get_pubkey(x);

            X509_free(x);

        }

        break;

    }

    if (pkey == NULL)

        return 1;

    rsa = EVP_PKEY_get1_RSA(pkey);

    EVP_PKEY_free(pkey);

    if (rsa == NULL) {

        BIO_printf(bio_err, "Error getting RSA key\n");

        ERR_print_errors(bio_err);

        goto end;

    }

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

    if (in == NULL)

        goto end;

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

    if (out == NULL)

        goto end;

    keysize = RSA_size(rsa);

    rsa_in = app_malloc(keysize * 2, "hold rsa key");

    rsa_out = app_malloc(keysize, "output rsa key");

    /* Read the input data */

    rsa_inlen = BIO_read(in, rsa_in, keysize * 2);

    if (rsa_inlen < 0) {

        BIO_printf(bio_err, "Error reading input Data\n");

        goto end;

    }

    if (rev) {

        int i;

        unsigned char ctmp;

        for (i = 0; i < rsa_inlen / 2; i++) {

            ctmp = rsa_in[i];

            rsa_in[i] = rsa_in[rsa_inlen - 1 - i];

            rsa_in[rsa_inlen - 1 - i] = ctmp;

        }

    }

    switch (rsa_mode) {

    case RSA_VERIFY:

        rsa_outlen = RSA_public_decrypt(rsa_inlen, rsa_in, rsa_out, rsa, pad);

        break;

    case RSA_SIGN:

        rsa_outlen =

            RSA_private_encrypt(rsa_inlen, rsa_in, rsa_out, rsa, pad);

        break;

    case RSA_ENCRYPT:

        rsa_outlen = RSA_public_encrypt(rsa_inlen, rsa_in, rsa_out, rsa, pad);

        break;

    case RSA_DECRYPT:

        rsa_outlen =

            RSA_private_decrypt(rsa_inlen, rsa_in, rsa_out, rsa, pad);

        break;

    }

    if (rsa_outlen < 0) {

        BIO_printf(bio_err, "RSA operation error\n");

        ERR_print_errors(bio_err);

        goto end;

    }

    ret = 0;

    if (asn1parse) {

        if (!ASN1_parse_dump(out, rsa_out, rsa_outlen, 1, -1)) {

            ERR_print_errors(bio_err);

        }

    } else if (hexdump) {

        BIO_dump(out, (char *)rsa_out, rsa_outlen);

    } else {

        BIO_write(out, rsa_out, rsa_outlen);

    }

 end:

    RSA_free(rsa);

    release_engine(e);

    BIO_free(in);

    BIO_free_all(out);

    OPENSSL_free(rsa_in);

    OPENSSL_free(rsa_out);

    OPENSSL_free(passin);

    return ret;

}