1 /*
2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <openssl/opensslconf.h>
11 #include <stdio.h>
12 #include <string.h>
13 #include <sys/types.h>
14 #include <sys/stat.h>
15 #include "apps.h"
16 #include "progs.h"
17 #include <openssl/bio.h>
18 #include <openssl/err.h>
19 #include <openssl/bn.h>
20 #include <openssl/dsa.h>
21 #include <openssl/x509.h>
22 #include <openssl/pem.h>
23
24 typedef enum OPTION_choice {
25 OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
26 OPT_OUT, OPT_PASSOUT, OPT_ENGINE, OPT_CIPHER,
27 OPT_R_ENUM
28 } OPTION_CHOICE;
29
30 const OPTIONS gendsa_options[] = {
31 {OPT_HELP_STR, 1, '-', "Usage: %s [args] dsaparam-file\n"},
32 {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
33 {"help", OPT_HELP, '-', "Display this summary"},
34 {"out", OPT_OUT, '>', "Output the key to the specified file"},
35 {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
36 OPT_R_OPTIONS,
37 {"", OPT_CIPHER, '-', "Encrypt the output with any supported cipher"},
38 #ifndef OPENSSL_NO_ENGINE
39 {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
40 #endif
41 {NULL}
42 };
43
gendsa_main(int argc,char ** argv)44 int gendsa_main(int argc, char **argv)
45 {
46 ENGINE *e = NULL;
47 BIO *out = NULL, *in = NULL;
48 DSA *dsa = NULL;
49 const EVP_CIPHER *enc = NULL;
50 char *dsaparams = NULL;
51 char *outfile = NULL, *passoutarg = NULL, *passout = NULL, *prog;
52 OPTION_CHOICE o;
53 int ret = 1, private = 0;
54 const BIGNUM *p = NULL;
55
56 prog = opt_init(argc, argv, gendsa_options);
57 while ((o = opt_next()) != OPT_EOF) {
58 switch (o) {
59 case OPT_EOF:
60 case OPT_ERR:
61 opthelp:
62 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
63 goto end;
64 case OPT_HELP:
65 ret = 0;
66 opt_help(gendsa_options);
67 goto end;
68 case OPT_OUT:
69 outfile = opt_arg();
70 break;
71 case OPT_PASSOUT:
72 passoutarg = opt_arg();
73 break;
74 case OPT_ENGINE:
75 e = setup_engine(opt_arg(), 0);
76 break;
77 case OPT_R_CASES:
78 if (!opt_rand(o))
79 goto end;
80 break;
81 case OPT_CIPHER:
82 if (!opt_cipher(opt_unknown(), &enc))
83 goto end;
84 break;
85 }
86 }
87 argc = opt_num_rest();
88 argv = opt_rest();
89 private = 1;
90
91 if (argc != 1)
92 goto opthelp;
93 dsaparams = *argv;
94
95 if (!app_passwd(NULL, passoutarg, NULL, &passout)) {
96 BIO_printf(bio_err, "Error getting password\n");
97 goto end;
98 }
99
100 in = bio_open_default(dsaparams, 'r', FORMAT_PEM);
101 if (in == NULL)
102 goto end2;
103
104 if ((dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL)) == NULL) {
105 BIO_printf(bio_err, "unable to load DSA parameter file\n");
106 goto end;
107 }
108 BIO_free(in);
109 in = NULL;
110
111 out = bio_open_owner(outfile, FORMAT_PEM, private);
112 if (out == NULL)
113 goto end2;
114
115 DSA_get0_pqg(dsa, &p, NULL, NULL);
116
117 if (BN_num_bits(p) > OPENSSL_DSA_MAX_MODULUS_BITS)
118 BIO_printf(bio_err,
119 "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
120 " Your key size is %d! Larger key size may behave not as expected.\n",
121 OPENSSL_DSA_MAX_MODULUS_BITS, BN_num_bits(p));
122
123 BIO_printf(bio_err, "Generating DSA key, %d bits\n", BN_num_bits(p));
124 if (!DSA_generate_key(dsa))
125 goto end;
126
127 assert(private);
128 if (!PEM_write_bio_DSAPrivateKey(out, dsa, enc, NULL, 0, NULL, passout))
129 goto end;
130 ret = 0;
131 end:
132 if (ret != 0)
133 ERR_print_errors(bio_err);
134 end2:
135 BIO_free(in);
136 BIO_free_all(out);
137 DSA_free(dsa);
138 release_engine(e);
139 OPENSSL_free(passout);
140 return ret;
141 }
142