2 * Copyright 1995-2020 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>
14 #include <sys/types.h>
18 #include <openssl/bio.h>
19 #include <openssl/err.h>
20 #include <openssl/bn.h>
21 #include <openssl/rsa.h>
22 #include <openssl/evp.h>
23 #include <openssl/x509.h>
24 #include <openssl/pem.h>
25 #include <openssl/rand.h>
30 static int verbose = 0;
32 static int genrsa_cb(EVP_PKEY_CTX *ctx);
34 typedef enum OPTION_choice {
35 OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
36 #ifndef OPENSSL_NO_DEPRECATED_3_0
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 #ifndef OPENSSL_NO_DEPRECATED_3_0
55 {"3", OPT_3, '-', "(deprecated) Use 3 for the E value"},
57 {"F4", OPT_F4, '-', "Use the Fermat number F4 (0x10001) for the E value"},
58 {"f4", OPT_F4, '-', "Use the Fermat number F4 (0x10001) for the E value"},
60 OPT_SECTION("Output"),
61 {"out", OPT_OUT, '>', "Output the key to specified file"},
62 {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
63 {"primes", OPT_PRIMES, 'p', "Specify number of primes"},
64 {"verbose", OPT_VERBOSE, '-', "Verbose output"},
65 {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
71 {"numbits", 0, 0, "Size of key in bits"},
75 int genrsa_main(int argc, char **argv)
77 BN_GENCB *cb = BN_GENCB_new();
79 BIGNUM *bn = BN_new();
83 EVP_PKEY *pkey = NULL;
84 EVP_PKEY_CTX *ctx = NULL;
85 const EVP_CIPHER *enc = NULL;
86 int ret = 1, num = DEFBITS, private = 0, primes = DEFPRIMES;
87 unsigned long f4 = RSA_F4;
88 char *outfile = NULL, *passoutarg = NULL, *passout = NULL;
89 char *prog, *hexe, *dece;
91 unsigned char *ebuf = NULL;
93 if (bn == NULL || cb == NULL)
96 prog = opt_init(argc, argv, genrsa_options);
97 while ((o = opt_next()) != OPT_EOF) {
102 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
106 opt_help(genrsa_options);
108 #ifndef OPENSSL_NO_DEPRECATED_3_0
120 eng = setup_engine(opt_arg(), 0);
127 if (!opt_provider(o))
131 passoutarg = opt_arg();
134 if (!opt_cipher(opt_unknown(), &enc))
138 if (!opt_int(opt_arg(), &primes))
146 argc = opt_num_rest();
150 if (!opt_int(argv[0], &num) || num <= 0)
152 if (num > OPENSSL_RSA_MAX_MODULUS_BITS)
154 "Warning: It is not recommended to use more than %d bit for RSA keys.\n"
155 " Your key size is %d! Larger key size may behave not as expected.\n",
156 OPENSSL_RSA_MAX_MODULUS_BITS, num);
157 } else if (argc > 0) {
158 BIO_printf(bio_err, "Extra arguments given.\n");
163 if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
164 BIO_printf(bio_err, "Error getting password\n");
168 out = bio_open_owner(outfile, FORMAT_PEM, private);
172 if (!init_gen_str(&ctx, "RSA", eng, 0))
175 EVP_PKEY_CTX_set_cb(ctx, genrsa_cb);
176 EVP_PKEY_CTX_set_app_data(ctx, bio_err);
178 if (EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, num) <= 0) {
179 BIO_printf(bio_err, "Error setting RSA length\n");
182 if (!BN_set_word(bn, f4)) {
183 BIO_printf(bio_err, "Error allocating RSA public exponent\n");
186 if (EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, bn) <= 0) {
187 BIO_printf(bio_err, "Error setting RSA public exponent\n");
190 if (EVP_PKEY_CTX_set_rsa_keygen_primes(ctx, primes) <= 0) {
191 BIO_printf(bio_err, "Error setting number of primes\n");
195 BIO_printf(bio_err, "Generating RSA private key, %d bit long modulus (%d primes)\n",
197 if (!EVP_PKEY_keygen(ctx, &pkey)) {
198 BIO_printf(bio_err, "Error generating RSA key\n");
203 if ((rsa = EVP_PKEY_get0_RSA(pkey)) != NULL) {
204 RSA_get0_key(rsa, NULL, &e, NULL);
206 BIO_printf(bio_err, "Error cannot access RSA e\n");
212 BIO_printf(bio_err, "e is %s (0x%s)\n", dece, hexe);
217 if (!PEM_write_bio_PrivateKey(out, pkey, enc, NULL, 0, NULL, passout))
224 EVP_PKEY_CTX_free(ctx);
228 OPENSSL_free(passout);
231 ERR_print_errors(bio_err);
235 static int genrsa_cb(EVP_PKEY_CTX *ctx)
238 BIO *b = EVP_PKEY_CTX_get_app_data(ctx);
239 int p = EVP_PKEY_CTX_get_keygen_info(ctx, 0);