mirror of
https://github.com/openssl/openssl.git
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606a417fb2
Reviewed-by: Richard Levitte <levitte@openssl.org> Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com> (Merged from https://github.com/openssl/openssl/pull/14219)
276 lines
7.4 KiB
C
276 lines
7.4 KiB
C
/*
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* Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <openssl/opensslconf.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "apps.h"
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#include "progs.h"
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#include <openssl/bio.h>
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#include <openssl/err.h>
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#include <openssl/bn.h>
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#include <openssl/rsa.h>
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#include <openssl/evp.h>
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#include <openssl/x509.h>
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#include <openssl/pem.h>
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#include <openssl/rand.h>
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#define DEFBITS 2048
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#define DEFPRIMES 2
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static int verbose = 0;
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static int genrsa_cb(EVP_PKEY_CTX *ctx);
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typedef enum OPTION_choice {
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OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
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#ifndef OPENSSL_NO_DEPRECATED_3_0
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OPT_3,
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#endif
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OPT_F4, OPT_ENGINE,
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OPT_OUT, OPT_PASSOUT, OPT_CIPHER, OPT_PRIMES, OPT_VERBOSE,
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OPT_R_ENUM, OPT_PROV_ENUM, OPT_TRADITIONAL
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} OPTION_CHOICE;
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const OPTIONS genrsa_options[] = {
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{OPT_HELP_STR, 1, '-', "Usage: %s [options] numbits\n"},
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OPT_SECTION("General"),
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{"help", OPT_HELP, '-', "Display this summary"},
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#ifndef OPENSSL_NO_ENGINE
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{"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
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#endif
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OPT_SECTION("Input"),
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#ifndef OPENSSL_NO_DEPRECATED_3_0
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{"3", OPT_3, '-', "(deprecated) Use 3 for the E value"},
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#endif
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{"F4", OPT_F4, '-', "Use the Fermat number F4 (0x10001) for the E value"},
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{"f4", OPT_F4, '-', "Use the Fermat number F4 (0x10001) for the E value"},
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OPT_SECTION("Output"),
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{"out", OPT_OUT, '>', "Output the key to specified file"},
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{"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
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{"primes", OPT_PRIMES, 'p', "Specify number of primes"},
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{"verbose", OPT_VERBOSE, '-', "Verbose output"},
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{"traditional", OPT_TRADITIONAL, '-',
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"Use traditional format for private keys"},
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{"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
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OPT_R_OPTIONS,
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OPT_PROV_OPTIONS,
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OPT_PARAMETERS(),
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{"numbits", 0, 0, "Size of key in bits"},
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{NULL}
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};
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int genrsa_main(int argc, char **argv)
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{
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BN_GENCB *cb = BN_GENCB_new();
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ENGINE *eng = NULL;
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BIGNUM *bn = BN_new();
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BIO *out = NULL;
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EVP_PKEY *pkey = NULL;
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EVP_PKEY_CTX *ctx = NULL;
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EVP_CIPHER *enc = NULL;
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int ret = 1, num = DEFBITS, private = 0, primes = DEFPRIMES;
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unsigned long f4 = RSA_F4;
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char *outfile = NULL, *passoutarg = NULL, *passout = NULL;
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char *prog, *hexe, *dece, *ciphername = NULL;
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OPTION_CHOICE o;
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int traditional = 0;
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if (bn == NULL || cb == NULL)
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goto end;
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prog = opt_init(argc, argv, genrsa_options);
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while ((o = opt_next()) != OPT_EOF) {
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switch (o) {
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case OPT_EOF:
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case OPT_ERR:
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opthelp:
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BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
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goto end;
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case OPT_HELP:
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ret = 0;
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opt_help(genrsa_options);
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goto end;
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#ifndef OPENSSL_NO_DEPRECATED_3_0
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case OPT_3:
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f4 = RSA_3;
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break;
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#endif
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case OPT_F4:
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f4 = RSA_F4;
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break;
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case OPT_OUT:
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outfile = opt_arg();
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break;
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case OPT_ENGINE:
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eng = setup_engine(opt_arg(), 0);
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break;
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case OPT_R_CASES:
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if (!opt_rand(o))
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goto end;
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break;
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case OPT_PROV_CASES:
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if (!opt_provider(o))
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goto end;
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break;
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case OPT_PASSOUT:
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passoutarg = opt_arg();
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break;
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case OPT_CIPHER:
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ciphername = opt_unknown();
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break;
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case OPT_PRIMES:
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if (!opt_int(opt_arg(), &primes))
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goto end;
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break;
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case OPT_VERBOSE:
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verbose = 1;
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break;
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case OPT_TRADITIONAL:
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traditional = 1;
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break;
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}
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}
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/* One optional argument, the bitsize. */
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argc = opt_num_rest();
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argv = opt_rest();
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if (argc == 1) {
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if (!opt_int(argv[0], &num) || num <= 0)
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goto end;
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if (num > OPENSSL_RSA_MAX_MODULUS_BITS)
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BIO_printf(bio_err,
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"Warning: It is not recommended to use more than %d bit for RSA keys.\n"
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" Your key size is %d! Larger key size may behave not as expected.\n",
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OPENSSL_RSA_MAX_MODULUS_BITS, num);
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} else if (argc > 0) {
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BIO_printf(bio_err, "Extra arguments given.\n");
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goto opthelp;
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}
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if (!app_RAND_load())
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goto end;
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private = 1;
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if (ciphername != NULL) {
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if (!opt_cipher(ciphername, &enc))
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goto end;
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}
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if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
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BIO_printf(bio_err, "Error getting password\n");
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goto end;
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}
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out = bio_open_owner(outfile, FORMAT_PEM, private);
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if (out == NULL)
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goto end;
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if (!init_gen_str(&ctx, "RSA", eng, 0, NULL, NULL))
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goto end;
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EVP_PKEY_CTX_set_cb(ctx, genrsa_cb);
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EVP_PKEY_CTX_set_app_data(ctx, bio_err);
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if (EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, num) <= 0) {
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BIO_printf(bio_err, "Error setting RSA length\n");
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goto end;
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}
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if (!BN_set_word(bn, f4)) {
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BIO_printf(bio_err, "Error allocating RSA public exponent\n");
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goto end;
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}
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if (EVP_PKEY_CTX_set1_rsa_keygen_pubexp(ctx, bn) <= 0) {
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BIO_printf(bio_err, "Error setting RSA public exponent\n");
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goto end;
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}
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if (EVP_PKEY_CTX_set_rsa_keygen_primes(ctx, primes) <= 0) {
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BIO_printf(bio_err, "Error setting number of primes\n");
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goto end;
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}
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if (verbose)
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BIO_printf(bio_err, "Generating RSA private key, %d bit long modulus (%d primes)\n",
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num, primes);
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if (!EVP_PKEY_keygen(ctx, &pkey)) {
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BIO_printf(bio_err, "Error generating RSA key\n");
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goto end;
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}
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if (verbose) {
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BIGNUM *e = NULL;
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/* Every RSA key has an 'e' */
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EVP_PKEY_get_bn_param(pkey, "e", &e);
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if (e == NULL) {
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BIO_printf(bio_err, "Error cannot access RSA e\n");
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goto end;
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}
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hexe = BN_bn2hex(e);
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dece = BN_bn2dec(e);
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if (hexe && dece) {
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BIO_printf(bio_err, "e is %s (0x%s)\n", dece, hexe);
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}
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OPENSSL_free(hexe);
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OPENSSL_free(dece);
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BN_free(e);
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}
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if (traditional) {
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if (!PEM_write_bio_PrivateKey_traditional(out, pkey, enc, NULL, 0,
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NULL, passout))
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goto end;
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} else {
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if (!PEM_write_bio_PrivateKey(out, pkey, enc, NULL, 0, NULL, passout))
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goto end;
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}
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ret = 0;
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end:
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BN_free(bn);
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BN_GENCB_free(cb);
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EVP_PKEY_CTX_free(ctx);
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EVP_PKEY_free(pkey);
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EVP_CIPHER_free(enc);
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BIO_free_all(out);
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release_engine(eng);
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OPENSSL_free(passout);
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if (ret != 0)
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ERR_print_errors(bio_err);
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return ret;
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}
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static int genrsa_cb(EVP_PKEY_CTX *ctx)
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{
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char c = '*';
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BIO *b = EVP_PKEY_CTX_get_app_data(ctx);
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int p = EVP_PKEY_CTX_get_keygen_info(ctx, 0);
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if (!verbose)
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return 1;
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if (p == 0)
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c = '.';
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if (p == 1)
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c = '+';
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if (p == 2)
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c = '*';
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if (p == 3)
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c = '\n';
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BIO_write(b, &c, 1);
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(void)BIO_flush(b);
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return 1;
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}
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