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 /* We need to use the deprecated RSA low level calls */
11 #define OPENSSL_SUPPRESS_DEPRECATED
13 #include <openssl/opensslconf.h>
17 #include <sys/types.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,
41 OPT_R_ENUM, OPT_PROV_ENUM
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"},
69 {"numbits", 0, 0, "Size of key in bits"},
73 int genrsa_main(int argc, char **argv)
75 BN_GENCB *cb = BN_GENCB_new();
78 BIGNUM *bn = BN_new();
82 const EVP_CIPHER *enc = NULL;
83 int ret = 1, num = DEFBITS, private = 0, primes = DEFPRIMES;
84 unsigned long f4 = RSA_F4;
85 char *outfile = NULL, *passoutarg = NULL, *passout = NULL;
86 char *prog, *hexe, *dece;
89 if (bn == NULL || cb == NULL)
92 BN_GENCB_set(cb, genrsa_cb, bio_err);
94 prog = opt_init(argc, argv, genrsa_options);
95 while ((o = opt_next()) != OPT_EOF) {
100 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
104 opt_help(genrsa_options);
116 eng = setup_engine(opt_arg(), 0);
123 if (!opt_provider(o))
127 passoutarg = opt_arg();
130 if (!opt_cipher(opt_unknown(), &enc))
134 if (!opt_int(opt_arg(), &primes))
142 argc = opt_num_rest();
146 if (!opt_int(argv[0], &num) || num <= 0)
148 if (num > OPENSSL_RSA_MAX_MODULUS_BITS)
150 "Warning: It is not recommended to use more than %d bit for RSA keys.\n"
151 " Your key size is %d! Larger key size may behave not as expected.\n",
152 OPENSSL_RSA_MAX_MODULUS_BITS, num);
153 } else if (argc > 0) {
154 BIO_printf(bio_err, "Extra arguments given.\n");
159 if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
160 BIO_printf(bio_err, "Error getting password\n");
164 out = bio_open_owner(outfile, FORMAT_PEM, private);
169 BIO_printf(bio_err, "Generating RSA private key, %d bit long modulus (%d primes)\n",
171 rsa = eng ? RSA_new_method(eng) : RSA_new();
175 if (!BN_set_word(bn, f4)
176 || !RSA_generate_multi_prime_key(rsa, num, primes, bn, cb))
179 RSA_get0_key(rsa, NULL, &e, NULL);
182 if (hexe && dece && verbose) {
183 BIO_printf(bio_err, "e is %s (0x%s)\n", dece, hexe);
187 cb_data.password = passout;
188 cb_data.prompt_info = outfile;
190 if (!PEM_write_bio_RSAPrivateKey(out, rsa, enc, NULL, 0,
191 (pem_password_cb *)password_callback,
202 OPENSSL_free(passout);
204 ERR_print_errors(bio_err);
208 static int genrsa_cb(int p, int n, BN_GENCB *cb)
223 BIO_write(BN_GENCB_get_arg(cb), &c, 1);
224 (void)BIO_flush(BN_GENCB_get_arg(cb));