| 1 | /*
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| 2 | * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <openssl/opensslconf.h>
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| 11 | #ifdef OPENSSL_NO_DSA
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| 12 | NON_EMPTY_TRANSLATION_UNIT
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| 13 | #else
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| 14 |
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| 15 | # include <stdio.h>
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| 16 | # include <string.h>
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| 17 | # include <sys/types.h>
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| 18 | # include <sys/stat.h>
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| 19 | # include "apps.h"
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| 20 | # include "progs.h"
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| 21 | # include <openssl/bio.h>
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| 22 | # include <openssl/err.h>
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| 23 | # include <openssl/bn.h>
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| 24 | # include <openssl/dsa.h>
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| 25 | # include <openssl/x509.h>
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| 26 | # include <openssl/pem.h>
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| 27 |
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| 28 | typedef enum OPTION_choice {
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| 29 | OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
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| 30 | OPT_OUT, OPT_PASSOUT, OPT_ENGINE, OPT_CIPHER,
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| 31 | OPT_R_ENUM
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| 32 | } OPTION_CHOICE;
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| 33 |
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| 34 | const OPTIONS gendsa_options[] = {
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| 35 | {OPT_HELP_STR, 1, '-', "Usage: %s [args] dsaparam-file\n"},
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| 36 | {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
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| 37 | {"help", OPT_HELP, '-', "Display this summary"},
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| 38 | {"out", OPT_OUT, '>', "Output the key to the specified file"},
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| 39 | {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
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| 40 | OPT_R_OPTIONS,
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| 41 | {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
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| 42 | # ifndef OPENSSL_NO_ENGINE
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| 43 | {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
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| 44 | # endif
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| 45 | {NULL}
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| 46 | };
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| 47 |
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| 48 | int gendsa_main(int argc, char **argv)
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| 49 | {
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| 50 | ENGINE *e = NULL;
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| 51 | BIO *out = NULL, *in = NULL;
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| 52 | DSA *dsa = NULL;
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| 53 | const EVP_CIPHER *enc = NULL;
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| 54 | char *dsaparams = NULL;
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| 55 | char *outfile = NULL, *passoutarg = NULL, *passout = NULL, *prog;
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| 56 | OPTION_CHOICE o;
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| 57 | int ret = 1, private = 0;
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| 58 | const BIGNUM *p = NULL;
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| 59 |
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| 60 | prog = opt_init(argc, argv, gendsa_options);
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| 61 | while ((o = opt_next()) != OPT_EOF) {
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| 62 | switch (o) {
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| 63 | case OPT_EOF:
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| 64 | case OPT_ERR:
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| 65 | opthelp:
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| 66 | BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
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| 67 | goto end;
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| 68 | case OPT_HELP:
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| 69 | ret = 0;
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| 70 | opt_help(gendsa_options);
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| 71 | goto end;
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| 72 | case OPT_OUT:
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| 73 | outfile = opt_arg();
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| 74 | break;
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| 75 | case OPT_PASSOUT:
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| 76 | passoutarg = opt_arg();
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| 77 | break;
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| 78 | case OPT_ENGINE:
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| 79 | e = setup_engine(opt_arg(), 0);
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| 80 | break;
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| 81 | case OPT_R_CASES:
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| 82 | if (!opt_rand(o))
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| 83 | goto end;
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| 84 | break;
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| 85 | case OPT_CIPHER:
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| 86 | if (!opt_cipher(opt_unknown(), &enc))
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| 87 | goto end;
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| 88 | break;
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| 89 | }
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| 90 | }
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| 91 | argc = opt_num_rest();
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| 92 | argv = opt_rest();
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| 93 | private = 1;
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| 94 |
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| 95 | if (argc != 1)
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| 96 | goto opthelp;
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| 97 | dsaparams = *argv;
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| 98 |
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| 99 | if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
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| 100 | BIO_printf(bio_err, "Error getting password\n");
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| 101 | goto end;
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| 102 | }
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| 103 |
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| 104 | in = bio_open_default(dsaparams, 'r', FORMAT_PEM);
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| 105 | if (in == NULL)
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| 106 | goto end2;
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| 107 |
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| 108 | if ((dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL)) == NULL) {
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| 109 | BIO_printf(bio_err, "unable to load DSA parameter file\n");
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| 110 | goto end;
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| 111 | }
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| 112 | BIO_free(in);
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| 113 | in = NULL;
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| 114 |
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| 115 | out = bio_open_owner(outfile, FORMAT_PEM, private);
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| 116 | if (out == NULL)
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| 117 | goto end2;
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| 118 |
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| 119 | DSA_get0_pqg(dsa, &p, NULL, NULL);
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| 120 |
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| 121 | if (BN_num_bits(p) > OPENSSL_DSA_MAX_MODULUS_BITS)
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| 122 | BIO_printf(bio_err,
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| 123 | "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
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| 124 | " Your key size is %d! Larger key size may behave not as expected.\n",
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| 125 | OPENSSL_DSA_MAX_MODULUS_BITS, BN_num_bits(p));
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| 126 |
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| 127 | BIO_printf(bio_err, "Generating DSA key, %d bits\n", BN_num_bits(p));
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| 128 | if (!DSA_generate_key(dsa))
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| 129 | goto end;
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| 130 |
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| 131 | assert(private);
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| 132 | if (!PEM_write_bio_DSAPrivateKey(out, dsa, enc, NULL, 0, NULL, passout))
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| 133 | goto end;
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| 134 | ret = 0;
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| 135 | end:
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| 136 | if (ret != 0)
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| 137 | ERR_print_errors(bio_err);
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| 138 | end2:
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| 139 | BIO_free(in);
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| 140 | BIO_free_all(out);
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| 141 | DSA_free(dsa);
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| 142 | release_engine(e);
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| 143 | OPENSSL_free(passout);
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| 144 | return ret;
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| 145 | }
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| 146 | #endif
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