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[] = {
46 OPT_SECTION("General"),
47 {"help", OPT_HELP, '-', "Display this summary"},
48 # ifndef OPENSSL_NO_ENGINE
49 {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
53 {"3", OPT_3, '-', "Use 3 for the E value"},
54 {"F4", OPT_F4, '-', "Use F4 (0x10001) for the E value"},
55 {"f4", OPT_F4, '-', "Use F4 (0x10001) for the E value"},
57 OPT_SECTION("Output"),
58 {"out", OPT_OUT, '>', "Output the key to specified file"},
59 {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
60 {"primes", OPT_PRIMES, 'p', "Specify number of primes"},
61 {"verbose", OPT_VERBOSE, '-', "Verbose output"},
62 {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
68 int genrsa_main(int argc, char **argv)
70 BN_GENCB *cb = BN_GENCB_new();
73 BIGNUM *bn = BN_new();
77 const EVP_CIPHER *enc = NULL;
78 int ret = 1, num = DEFBITS, private = 0, primes = DEFPRIMES;
79 unsigned long f4 = RSA_F4;
80 char *outfile = NULL, *passoutarg = NULL, *passout = NULL;
81 char *prog, *hexe, *dece;
84 if (bn == NULL || cb == NULL)
87 BN_GENCB_set(cb, genrsa_cb, bio_err);
89 prog = opt_init(argc, argv, genrsa_options);
90 while ((o = opt_next()) != OPT_EOF) {
95 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
99 opt_help(genrsa_options);
111 eng = setup_engine(opt_arg(), 0);
118 passoutarg = opt_arg();
121 if (!opt_cipher(opt_unknown(), &enc))
125 if (!opt_int(opt_arg(), &primes))
133 argc = opt_num_rest();
137 if (!opt_int(argv[0], &num) || num <= 0)
139 if (num > OPENSSL_RSA_MAX_MODULUS_BITS)
141 "Warning: It is not recommended to use more than %d bit for RSA keys.\n"
142 " Your key size is %d! Larger key size may behave not as expected.\n",
143 OPENSSL_RSA_MAX_MODULUS_BITS, num);
144 } else if (argc > 0) {
145 BIO_printf(bio_err, "Extra arguments given.\n");
150 if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
151 BIO_printf(bio_err, "Error getting password\n");
155 out = bio_open_owner(outfile, FORMAT_PEM, private);
160 BIO_printf(bio_err, "Generating RSA private key, %d bit long modulus (%d primes)\n",
162 rsa = eng ? RSA_new_method(eng) : RSA_new();
166 if (!BN_set_word(bn, f4)
167 || !RSA_generate_multi_prime_key(rsa, num, primes, bn, cb))
170 RSA_get0_key(rsa, NULL, &e, NULL);
173 if (hexe && dece && verbose) {
174 BIO_printf(bio_err, "e is %s (0x%s)\n", dece, hexe);
178 cb_data.password = passout;
179 cb_data.prompt_info = outfile;
181 if (!PEM_write_bio_RSAPrivateKey(out, rsa, enc, NULL, 0,
182 (pem_password_cb *)password_callback,
193 OPENSSL_free(passout);
195 ERR_print_errors(bio_err);
199 static int genrsa_cb(int p, int n, BN_GENCB *cb)
214 BIO_write(BN_GENCB_get_arg(cb), &c, 1);
215 (void)BIO_flush(BN_GENCB_get_arg(cb));