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 OPT_3, OPT_F4, OPT_ENGINE,
37 OPT_OUT, OPT_PASSOUT, OPT_CIPHER, OPT_PRIMES, OPT_VERBOSE,
38 OPT_R_ENUM, OPT_PROV_ENUM
41 const OPTIONS genrsa_options[] = {
42 {OPT_HELP_STR, 1, '-', "Usage: %s [options] numbits\n"},
44 OPT_SECTION("General"),
45 {"help", OPT_HELP, '-', "Display this summary"},
46 #ifndef OPENSSL_NO_ENGINE
47 {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
51 {"3", OPT_3, '-', "Use 3 for the E value"},
52 {"F4", OPT_F4, '-', "Use F4 (0x10001) for the E value"},
53 {"f4", OPT_F4, '-', "Use F4 (0x10001) for the E value"},
55 OPT_SECTION("Output"),
56 {"out", OPT_OUT, '>', "Output the key to specified file"},
57 {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
58 {"primes", OPT_PRIMES, 'p', "Specify number of primes"},
59 {"verbose", OPT_VERBOSE, '-', "Verbose output"},
60 {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
66 {"numbits", 0, 0, "Size of key in bits"},
70 int genrsa_main(int argc, char **argv)
72 BN_GENCB *cb = BN_GENCB_new();
74 BIGNUM *bn = BN_new();
78 EVP_PKEY *pkey = NULL;
79 EVP_PKEY_CTX *ctx = NULL;
80 const EVP_CIPHER *enc = NULL;
81 int ret = 1, num = DEFBITS, private = 0, primes = DEFPRIMES;
82 unsigned long f4 = RSA_F4;
83 char *outfile = NULL, *passoutarg = NULL, *passout = NULL;
84 char *prog, *hexe, *dece;
86 unsigned char *ebuf = NULL;
88 if (bn == NULL || cb == NULL)
91 prog = opt_init(argc, argv, genrsa_options);
92 while ((o = opt_next()) != OPT_EOF) {
97 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
101 opt_help(genrsa_options);
113 eng = setup_engine(opt_arg(), 0);
120 if (!opt_provider(o))
124 passoutarg = opt_arg();
127 if (!opt_cipher(opt_unknown(), &enc))
131 if (!opt_int(opt_arg(), &primes))
139 argc = opt_num_rest();
143 if (!opt_int(argv[0], &num) || num <= 0)
145 if (num > OPENSSL_RSA_MAX_MODULUS_BITS)
147 "Warning: It is not recommended to use more than %d bit for RSA keys.\n"
148 " Your key size is %d! Larger key size may behave not as expected.\n",
149 OPENSSL_RSA_MAX_MODULUS_BITS, num);
150 } else if (argc > 0) {
151 BIO_printf(bio_err, "Extra arguments given.\n");
156 if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
157 BIO_printf(bio_err, "Error getting password\n");
161 out = bio_open_owner(outfile, FORMAT_PEM, private);
165 if (!init_gen_str(&ctx, "RSA", eng, 0))
168 EVP_PKEY_CTX_set_cb(ctx, genrsa_cb);
169 EVP_PKEY_CTX_set_app_data(ctx, bio_err);
171 if (EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, num) <= 0) {
172 BIO_printf(bio_err, "Error setting RSA length\n");
175 if (!BN_set_word(bn, f4)) {
176 BIO_printf(bio_err, "Error allocating RSA public exponent\n");
179 if (EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, bn) <= 0) {
180 BIO_printf(bio_err, "Error setting RSA public exponent\n");
183 if (EVP_PKEY_CTX_set_rsa_keygen_primes(ctx, primes) <= 0) {
184 BIO_printf(bio_err, "Error setting number of primes\n");
188 BIO_printf(bio_err, "Generating RSA private key, %d bit long modulus (%d primes)\n",
190 if (!EVP_PKEY_keygen(ctx, &pkey)) {
191 BIO_printf(bio_err, "Error generating RSA key\n");
196 if ((rsa = EVP_PKEY_get0_RSA(pkey)) != NULL) {
197 RSA_get0_key(rsa, NULL, &e, NULL);
199 BIO_printf(bio_err, "Error cannot access RSA e\n");
205 BIO_printf(bio_err, "e is %s (0x%s)\n", dece, hexe);
210 if (!PEM_write_bio_PrivateKey(out, pkey, enc, NULL, 0, NULL, passout))
217 EVP_PKEY_CTX_free(ctx);
221 OPENSSL_free(passout);
224 ERR_print_errors(bio_err);
228 static int genrsa_cb(EVP_PKEY_CTX *ctx)
231 BIO *b = EVP_PKEY_CTX_get_app_data(ctx);
232 int p = EVP_PKEY_CTX_get_keygen_info(ctx, 0);