147 lines
4.0 KiB
C
147 lines
4.0 KiB
C
/*
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* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (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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#ifdef OPENSSL_NO_DSA
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NON_EMPTY_TRANSLATION_UNIT
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#else
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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/dsa.h>
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# include <openssl/x509.h>
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# include <openssl/pem.h>
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typedef enum OPTION_choice {
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OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
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OPT_OUT, OPT_PASSOUT, OPT_ENGINE, OPT_CIPHER,
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OPT_R_ENUM
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} OPTION_CHOICE;
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const OPTIONS gendsa_options[] = {
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{OPT_HELP_STR, 1, '-', "Usage: %s [args] dsaparam-file\n"},
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{OPT_HELP_STR, 1, '-', "Valid options are:\n"},
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{"help", OPT_HELP, '-', "Display this summary"},
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{"out", OPT_OUT, '>', "Output the key to the specified file"},
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{"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
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OPT_R_OPTIONS,
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{"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
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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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{NULL}
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};
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int gendsa_main(int argc, char **argv)
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{
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ENGINE *e = NULL;
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BIO *out = NULL, *in = NULL;
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DSA *dsa = NULL;
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const EVP_CIPHER *enc = NULL;
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char *dsaparams = NULL;
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char *outfile = NULL, *passoutarg = NULL, *passout = NULL, *prog;
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OPTION_CHOICE o;
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int ret = 1, private = 0;
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const BIGNUM *p = NULL;
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prog = opt_init(argc, argv, gendsa_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(gendsa_options);
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goto end;
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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_PASSOUT:
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passoutarg = opt_arg();
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break;
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case OPT_ENGINE:
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e = 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_CIPHER:
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if (!opt_cipher(opt_unknown(), &enc))
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goto end;
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break;
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}
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}
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argc = opt_num_rest();
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argv = opt_rest();
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private = 1;
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if (argc != 1)
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goto opthelp;
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dsaparams = *argv;
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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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in = bio_open_default(dsaparams, 'r', FORMAT_PEM);
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if (in == NULL)
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goto end2;
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if ((dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL)) == NULL) {
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BIO_printf(bio_err, "unable to load DSA parameter file\n");
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goto end;
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}
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BIO_free(in);
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in = NULL;
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out = bio_open_owner(outfile, FORMAT_PEM, private);
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if (out == NULL)
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goto end2;
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DSA_get0_pqg(dsa, &p, NULL, NULL);
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if (BN_num_bits(p) > OPENSSL_DSA_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 DSA 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_DSA_MAX_MODULUS_BITS, BN_num_bits(p));
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BIO_printf(bio_err, "Generating DSA key, %d bits\n", BN_num_bits(p));
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if (!DSA_generate_key(dsa))
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goto end;
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assert(private);
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if (!PEM_write_bio_DSAPrivateKey(out, dsa, enc, NULL, 0, NULL, passout))
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goto end;
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ret = 0;
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end:
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if (ret != 0)
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ERR_print_errors(bio_err);
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end2:
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BIO_free(in);
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BIO_free_all(out);
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DSA_free(dsa);
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release_engine(e);
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OPENSSL_free(passout);
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return ret;
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}
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#endif
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