Blame apps/genrsa.c

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/*
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 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
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 *
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 * Licensed under the OpenSSL license (the "License").  You may not use
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 * this file except in compliance with the License.  You can obtain a copy
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 * in the file LICENSE in the source distribution or at
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 * https://www.openssl.org/source/license.html
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 */
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#include <openssl/opensslconf.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "apps.h"
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#include "progs.h"
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#include <openssl/bio.h>
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#include <openssl/err.h>
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#include <openssl/bn.h>
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#include <openssl/rsa.h>
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#include <openssl/evp.h>
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#include <openssl/x509.h>
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#include <openssl/pem.h>
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#include <openssl/rand.h>
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#define DEFBITS 2048
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#define DEFPRIMES 2
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static int genrsa_cb(int p, int n, BN_GENCB *cb);
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typedef enum OPTION_choice {
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    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
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    OPT_3, OPT_F4, OPT_ENGINE,
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    OPT_OUT, OPT_PASSOUT, OPT_CIPHER, OPT_PRIMES,
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    OPT_R_ENUM
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} OPTION_CHOICE;
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const OPTIONS genrsa_options[] = {
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    {"help", OPT_HELP, '-', "Display this summary"},
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    {"3", OPT_3, '-', "Use 3 for the E value"},
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    {"F4", OPT_F4, '-', "Use F4 (0x10001) for the E value"},
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    {"f4", OPT_F4, '-', "Use F4 (0x10001) for the E value"},
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    {"out", OPT_OUT, '>', "Output the key to specified file"},
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    OPT_R_OPTIONS,
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    {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
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    {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
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#ifndef OPENSSL_NO_ENGINE
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    {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
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#endif
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    {"primes", OPT_PRIMES, 'p', "Specify number of primes"},
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    {NULL}
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};
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int genrsa_main(int argc, char **argv)
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{
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    BN_GENCB *cb = BN_GENCB_new();
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    PW_CB_DATA cb_data;
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    ENGINE *eng = NULL;
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    BIGNUM *bn = BN_new();
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    BIO *out = NULL;
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    const BIGNUM *e;
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    RSA *rsa = NULL;
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    const EVP_CIPHER *enc = NULL;
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    int ret = 1, num = DEFBITS, private = 0, primes = DEFPRIMES;
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    unsigned long f4 = RSA_F4;
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    char *outfile = NULL, *passoutarg = NULL, *passout = NULL;
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    char *prog, *hexe, *dece;
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    OPTION_CHOICE o;
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    if (bn == NULL || cb == NULL)
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        goto end;
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    BN_GENCB_set(cb, genrsa_cb, bio_err);
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    prog = opt_init(argc, argv, genrsa_options);
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    while ((o = opt_next()) != OPT_EOF) {
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        switch (o) {
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        case OPT_EOF:
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        case OPT_ERR:
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opthelp:
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            BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
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            goto end;
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        case OPT_HELP:
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            ret = 0;
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            opt_help(genrsa_options);
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            goto end;
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        case OPT_3:
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            f4 = 3;
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            break;
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        case OPT_F4:
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            f4 = RSA_F4;
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            break;
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        case OPT_OUT:
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            outfile = opt_arg();
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            break;
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        case OPT_ENGINE:
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            eng = setup_engine(opt_arg(), 0);
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            break;
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        case OPT_R_CASES:
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            if (!opt_rand(o))
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                goto end;
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            break;
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        case OPT_PASSOUT:
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            passoutarg = opt_arg();
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            break;
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        case OPT_CIPHER:
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            if (!opt_cipher(opt_unknown(), &enc))
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                goto end;
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            break;
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        case OPT_PRIMES:
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            if (!opt_int(opt_arg(), &primes))
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                goto end;
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            break;
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        }
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    }
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    argc = opt_num_rest();
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    argv = opt_rest();
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    if (argc == 1) {
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        if (!opt_int(argv[0], &num) || num <= 0)
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            goto end;
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        if (num > OPENSSL_RSA_MAX_MODULUS_BITS)
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            BIO_printf(bio_err,
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                       "Warning: It is not recommended to use more than %d bit for RSA keys.\n"
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                       "         Your key size is %d! Larger key size may behave not as expected.\n",
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                       OPENSSL_RSA_MAX_MODULUS_BITS, num);
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    } else if (argc > 0) {
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        BIO_printf(bio_err, "Extra arguments given.\n");
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        goto opthelp;
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    }
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    private = 1;
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    if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
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        BIO_printf(bio_err, "Error getting password\n");
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        goto end;
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    }
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    out = bio_open_owner(outfile, FORMAT_PEM, private);
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    if (out == NULL)
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        goto end;
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    BIO_printf(bio_err, "Generating RSA private key, %d bit long modulus (%d primes)\n",
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               num, primes);
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    rsa = eng ? RSA_new_method(eng) : RSA_new();
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    if (rsa == NULL)
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        goto end;
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    if (!BN_set_word(bn, f4)
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        || !RSA_generate_multi_prime_key(rsa, num, primes, bn, cb))
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        goto end;
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    RSA_get0_key(rsa, NULL, &e, NULL);
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    hexe = BN_bn2hex(e);
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    dece = BN_bn2dec(e);
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    if (hexe && dece) {
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        BIO_printf(bio_err, "e is %s (0x%s)\n", dece, hexe);
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    }
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    OPENSSL_free(hexe);
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    OPENSSL_free(dece);
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    cb_data.password = passout;
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    cb_data.prompt_info = outfile;
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    assert(private);
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    if (!PEM_write_bio_RSAPrivateKey(out, rsa, enc, NULL, 0,
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                                     (pem_password_cb *)password_callback,
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                                     &cb_data))
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        goto end;
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    ret = 0;
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    BN_free(bn);
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    BN_GENCB_free(cb);
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    RSA_free(rsa);
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    BIO_free_all(out);
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    release_engine(eng);
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    OPENSSL_free(passout);
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    if (ret != 0)
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        ERR_print_errors(bio_err);
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    return ret;
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}
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static int genrsa_cb(int p, int n, BN_GENCB *cb)
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{
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    char c = '*';
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    if (p == 0)
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        c = '.';
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    if (p == 1)
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        c = '+';
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    if (p == 2)
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        c = '*';
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    if (p == 3)
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        c = '\n';
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    BIO_write(BN_GENCB_get_arg(cb), &c, 1);
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    (void)BIO_flush(BN_GENCB_get_arg(cb));
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    return 1;
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}