2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include <openssl/opensslconf.h>
12 NON_EMPTY_TRANSLATION_UNIT
17 # include <sys/types.h>
18 # include <sys/stat.h>
21 # include <openssl/bio.h>
22 # include <openssl/err.h>
23 # include <openssl/bn.h>
24 # include <openssl/rsa.h>
25 # include <openssl/evp.h>
26 # include <openssl/x509.h>
27 # include <openssl/pem.h>
28 # include <openssl/rand.h>
33 static int verbose = 0;
35 static int genrsa_cb(int p, int n, BN_GENCB *cb);
37 typedef enum OPTION_choice {
38 OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
39 OPT_3, OPT_F4, OPT_ENGINE,
40 OPT_OUT, OPT_PASSOUT, OPT_CIPHER, OPT_PRIMES, OPT_VERBOSE,
44 const OPTIONS genrsa_options[] = {
45 {OPT_HELP_STR, 1, '-', "Usage: %s [options] numbits\n"},
47 OPT_SECTION("General"),
48 {"help", OPT_HELP, '-', "Display this summary"},
49 # ifndef OPENSSL_NO_ENGINE
50 {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
54 {"3", OPT_3, '-', "Use 3 for the E value"},
55 {"F4", OPT_F4, '-', "Use F4 (0x10001) for the E value"},
56 {"f4", OPT_F4, '-', "Use F4 (0x10001) for the E value"},
58 OPT_SECTION("Output"),
59 {"out", OPT_OUT, '>', "Output the key to specified file"},
60 {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
61 {"primes", OPT_PRIMES, 'p', "Specify number of primes"},
62 {"verbose", OPT_VERBOSE, '-', "Verbose output"},
63 {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
68 {"numbits", 0, 0, "Size of key in bits"},
72 int genrsa_main(int argc, char **argv)
74 BN_GENCB *cb = BN_GENCB_new();
77 BIGNUM *bn = BN_new();
81 const EVP_CIPHER *enc = NULL;
82 int ret = 1, num = DEFBITS, private = 0, primes = DEFPRIMES;
83 unsigned long f4 = RSA_F4;
84 char *outfile = NULL, *passoutarg = NULL, *passout = NULL;
85 char *prog, *hexe, *dece;
88 if (bn == NULL || cb == NULL)
91 BN_GENCB_set(cb, genrsa_cb, bio_err);
93 prog = opt_init(argc, argv, genrsa_options);
94 while ((o = opt_next()) != OPT_EOF) {
99 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
103 opt_help(genrsa_options);
115 eng = setup_engine(opt_arg(), 0);
122 passoutarg = opt_arg();
125 if (!opt_cipher(opt_unknown(), &enc))
129 if (!opt_int(opt_arg(), &primes))
137 argc = opt_num_rest();
141 if (!opt_int(argv[0], &num) || num <= 0)
143 if (num > OPENSSL_RSA_MAX_MODULUS_BITS)
145 "Warning: It is not recommended to use more than %d bit for RSA keys.\n"
146 " Your key size is %d! Larger key size may behave not as expected.\n",
147 OPENSSL_RSA_MAX_MODULUS_BITS, num);
148 } else if (argc > 0) {
149 BIO_printf(bio_err, "Extra arguments given.\n");
154 if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
155 BIO_printf(bio_err, "Error getting password\n");
159 out = bio_open_owner(outfile, FORMAT_PEM, private);
164 BIO_printf(bio_err, "Generating RSA private key, %d bit long modulus (%d primes)\n",
166 rsa = eng ? RSA_new_method(eng) : RSA_new();
170 if (!BN_set_word(bn, f4)
171 || !RSA_generate_multi_prime_key(rsa, num, primes, bn, cb))
174 RSA_get0_key(rsa, NULL, &e, NULL);
177 if (hexe && dece && verbose) {
178 BIO_printf(bio_err, "e is %s (0x%s)\n", dece, hexe);
182 cb_data.password = passout;
183 cb_data.prompt_info = outfile;
185 if (!PEM_write_bio_RSAPrivateKey(out, rsa, enc, NULL, 0,
186 (pem_password_cb *)password_callback,
197 OPENSSL_free(passout);
199 ERR_print_errors(bio_err);
203 static int genrsa_cb(int p, int n, BN_GENCB *cb)
218 BIO_write(BN_GENCB_get_arg(cb), &c, 1);
219 (void)BIO_flush(BN_GENCB_get_arg(cb));