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- /*
- * Copyright 1995-2020 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;
- static int genrsa_cb(EVP_PKEY_CTX *ctx);
- typedef enum OPTION_choice {
- OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
- #ifndef OPENSSL_NO_DEPRECATED_3_0
- OPT_3,
- #endif
- OPT_F4, OPT_ENGINE,
- OPT_OUT, OPT_PASSOUT, OPT_CIPHER, OPT_PRIMES, OPT_VERBOSE,
- 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"},
- {"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();
- RSA *rsa;
- BIO *out = NULL;
- const BIGNUM *e;
- EVP_PKEY *pkey = NULL;
- EVP_PKEY_CTX *ctx = NULL;
- const 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;
- OPTION_CHOICE o;
- int traditional = 0;
- if (bn == NULL || cb == NULL)
- goto end;
- 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:
- if (!opt_cipher(opt_unknown(), &enc))
- goto end;
- break;
- case OPT_PRIMES:
- if (!opt_int(opt_arg(), &primes))
- goto end;
- break;
- case OPT_VERBOSE:
- verbose = 1;
- break;
- case OPT_TRADITIONAL:
- traditional = 1;
- break;
- }
- }
- 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 (argc > 0) {
- BIO_printf(bio_err, "Extra arguments given.\n");
- goto opthelp;
- }
- private = 1;
- 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;
- EVP_PKEY_CTX_set_cb(ctx, genrsa_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;
- }
- if (verbose)
- BIO_printf(bio_err, "Generating RSA private key, %d bit long modulus (%d primes)\n",
- num, primes);
- if (!EVP_PKEY_keygen(ctx, &pkey)) {
- BIO_printf(bio_err, "Error generating RSA key\n");
- goto end;
- }
- if (verbose) {
- if ((rsa = EVP_PKEY_get0_RSA(pkey)) != NULL) {
- RSA_get0_key(rsa, NULL, &e, NULL);
- } else {
- 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);
- }
- 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);
- BIO_free_all(out);
- release_engine(eng);
- OPENSSL_free(passout);
- if (ret != 0)
- ERR_print_errors(bio_err);
- return ret;
- }
- static int genrsa_cb(EVP_PKEY_CTX *ctx)
- {
- char c = '*';
- BIO *b = EVP_PKEY_CTX_get_app_data(ctx);
- int p = EVP_PKEY_CTX_get_keygen_info(ctx, 0);
- if (!verbose)
- return 1;
- if (p == 0)
- c = '.';
- if (p == 1)
- c = '+';
- if (p == 2)
- c = '*';
- if (p == 3)
- c = '\n';
- BIO_write(b, &c, 1);
- (void)BIO_flush(b);
- return 1;
- }
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