| /* |
| * Copyright 1995-2022 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the Apache License 2.0 (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| #include <openssl/opensslconf.h> |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include "apps.h" |
| #include "progs.h" |
| #include <openssl/bio.h> |
| #include <openssl/err.h> |
| #include <openssl/bn.h> |
| #include <openssl/rsa.h> |
| #include <openssl/evp.h> |
| #include <openssl/x509.h> |
| #include <openssl/pem.h> |
| #include <openssl/rand.h> |
| |
| #define DEFBITS 2048 |
| #define DEFPRIMES 2 |
| |
| static int verbose = 0; |
| |
| typedef enum OPTION_choice { |
| OPT_COMMON, |
| #ifndef OPENSSL_NO_DEPRECATED_3_0 |
| OPT_3, |
| #endif |
| OPT_F4, OPT_ENGINE, |
| OPT_OUT, OPT_PASSOUT, OPT_CIPHER, OPT_PRIMES, OPT_VERBOSE, OPT_QUIET, |
| OPT_R_ENUM, OPT_PROV_ENUM, OPT_TRADITIONAL |
| } OPTION_CHOICE; |
| |
| const OPTIONS genrsa_options[] = { |
| {OPT_HELP_STR, 1, '-', "Usage: %s [options] numbits\n"}, |
| |
| OPT_SECTION("General"), |
| {"help", OPT_HELP, '-', "Display this summary"}, |
| #ifndef OPENSSL_NO_ENGINE |
| {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"}, |
| #endif |
| |
| OPT_SECTION("Input"), |
| #ifndef OPENSSL_NO_DEPRECATED_3_0 |
| {"3", OPT_3, '-', "(deprecated) Use 3 for the E value"}, |
| #endif |
| {"F4", OPT_F4, '-', "Use the Fermat number F4 (0x10001) for the E value"}, |
| {"f4", OPT_F4, '-', "Use the Fermat number F4 (0x10001) for the E value"}, |
| |
| OPT_SECTION("Output"), |
| {"out", OPT_OUT, '>', "Output the key to specified file"}, |
| {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"}, |
| {"primes", OPT_PRIMES, 'p', "Specify number of primes"}, |
| {"verbose", OPT_VERBOSE, '-', "Verbose output"}, |
| {"quiet", OPT_QUIET, '-', "Terse output"}, |
| {"traditional", OPT_TRADITIONAL, '-', |
| "Use traditional format for private keys"}, |
| {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"}, |
| |
| OPT_R_OPTIONS, |
| OPT_PROV_OPTIONS, |
| |
| OPT_PARAMETERS(), |
| {"numbits", 0, 0, "Size of key in bits"}, |
| {NULL} |
| }; |
| |
| int genrsa_main(int argc, char **argv) |
| { |
| BN_GENCB *cb = BN_GENCB_new(); |
| ENGINE *eng = NULL; |
| BIGNUM *bn = BN_new(); |
| BIO *out = NULL; |
| EVP_PKEY *pkey = NULL; |
| EVP_PKEY_CTX *ctx = NULL; |
| EVP_CIPHER *enc = NULL; |
| int ret = 1, num = DEFBITS, private = 0, primes = DEFPRIMES; |
| unsigned long f4 = RSA_F4; |
| char *outfile = NULL, *passoutarg = NULL, *passout = NULL; |
| char *prog, *hexe, *dece, *ciphername = NULL; |
| OPTION_CHOICE o; |
| int traditional = 0; |
| |
| if (bn == NULL || cb == NULL) |
| goto end; |
| |
| opt_set_unknown_name("cipher"); |
| prog = opt_init(argc, argv, genrsa_options); |
| while ((o = opt_next()) != OPT_EOF) { |
| switch (o) { |
| case OPT_EOF: |
| case OPT_ERR: |
| opthelp: |
| BIO_printf(bio_err, "%s: Use -help for summary.\n", prog); |
| goto end; |
| case OPT_HELP: |
| ret = 0; |
| opt_help(genrsa_options); |
| goto end; |
| #ifndef OPENSSL_NO_DEPRECATED_3_0 |
| case OPT_3: |
| f4 = RSA_3; |
| break; |
| #endif |
| case OPT_F4: |
| f4 = RSA_F4; |
| break; |
| case OPT_OUT: |
| outfile = opt_arg(); |
| break; |
| case OPT_ENGINE: |
| eng = setup_engine(opt_arg(), 0); |
| break; |
| case OPT_R_CASES: |
| if (!opt_rand(o)) |
| goto end; |
| break; |
| case OPT_PROV_CASES: |
| if (!opt_provider(o)) |
| goto end; |
| break; |
| case OPT_PASSOUT: |
| passoutarg = opt_arg(); |
| break; |
| case OPT_CIPHER: |
| ciphername = opt_unknown(); |
| break; |
| case OPT_PRIMES: |
| primes = opt_int_arg(); |
| break; |
| case OPT_VERBOSE: |
| verbose = 1; |
| break; |
| case OPT_QUIET: |
| verbose = 0; |
| break; |
| case OPT_TRADITIONAL: |
| traditional = 1; |
| break; |
| } |
| } |
| |
| /* One optional argument, the bitsize. */ |
| argc = opt_num_rest(); |
| argv = opt_rest(); |
| |
| if (argc == 1) { |
| if (!opt_int(argv[0], &num) || num <= 0) |
| goto end; |
| if (num > OPENSSL_RSA_MAX_MODULUS_BITS) |
| BIO_printf(bio_err, |
| "Warning: It is not recommended to use more than %d bit for RSA keys.\n" |
| " Your key size is %d! Larger key size may behave not as expected.\n", |
| OPENSSL_RSA_MAX_MODULUS_BITS, num); |
| } else if (!opt_check_rest_arg(NULL)) { |
| goto opthelp; |
| } |
| |
| if (!app_RAND_load()) |
| goto end; |
| |
| private = 1; |
| if (!opt_cipher(ciphername, &enc)) |
| goto end; |
| if (!app_passwd(NULL, passoutarg, NULL, &passout)) { |
| BIO_printf(bio_err, "Error getting password\n"); |
| goto end; |
| } |
| |
| out = bio_open_owner(outfile, FORMAT_PEM, private); |
| if (out == NULL) |
| goto end; |
| |
| if (!init_gen_str(&ctx, "RSA", eng, 0, NULL, NULL)) |
| goto end; |
| |
| if (verbose) |
| EVP_PKEY_CTX_set_cb(ctx, progress_cb); |
| EVP_PKEY_CTX_set_app_data(ctx, bio_err); |
| |
| if (EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, num) <= 0) { |
| BIO_printf(bio_err, "Error setting RSA length\n"); |
| goto end; |
| } |
| if (!BN_set_word(bn, f4)) { |
| BIO_printf(bio_err, "Error allocating RSA public exponent\n"); |
| goto end; |
| } |
| if (EVP_PKEY_CTX_set1_rsa_keygen_pubexp(ctx, bn) <= 0) { |
| BIO_printf(bio_err, "Error setting RSA public exponent\n"); |
| goto end; |
| } |
| if (EVP_PKEY_CTX_set_rsa_keygen_primes(ctx, primes) <= 0) { |
| BIO_printf(bio_err, "Error setting number of primes\n"); |
| goto end; |
| } |
| pkey = app_keygen(ctx, "RSA", num, verbose); |
| |
| if (verbose) { |
| BIGNUM *e = NULL; |
| |
| /* Every RSA key has an 'e' */ |
| EVP_PKEY_get_bn_param(pkey, "e", &e); |
| if (e == NULL) { |
| BIO_printf(bio_err, "Error cannot access RSA e\n"); |
| goto end; |
| } |
| hexe = BN_bn2hex(e); |
| dece = BN_bn2dec(e); |
| if (hexe && dece) { |
| BIO_printf(bio_err, "e is %s (0x%s)\n", dece, hexe); |
| } |
| OPENSSL_free(hexe); |
| OPENSSL_free(dece); |
| BN_free(e); |
| } |
| if (traditional) { |
| if (!PEM_write_bio_PrivateKey_traditional(out, pkey, enc, NULL, 0, |
| NULL, passout)) |
| goto end; |
| } else { |
| if (!PEM_write_bio_PrivateKey(out, pkey, enc, NULL, 0, NULL, passout)) |
| goto end; |
| } |
| |
| ret = 0; |
| end: |
| BN_free(bn); |
| BN_GENCB_free(cb); |
| EVP_PKEY_CTX_free(ctx); |
| EVP_PKEY_free(pkey); |
| EVP_CIPHER_free(enc); |
| BIO_free_all(out); |
| release_engine(eng); |
| OPENSSL_free(passout); |
| if (ret != 0) |
| ERR_print_errors(bio_err); |
| return ret; |
| } |
| |