2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (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
10 #include <openssl/opensslconf.h>
12 NON_EMPTY_TRANSLATION_UNIT
21 # include <openssl/bio.h>
22 # include <openssl/err.h>
23 # include <openssl/bn.h>
24 # include <openssl/dsa.h>
25 # include <openssl/x509.h>
26 # include <openssl/pem.h>
28 static int verbose
= 0;
30 static int dsa_cb(int p
, int n
, BN_GENCB
*cb
);
32 typedef enum OPTION_choice
{
33 OPT_ERR
= -1, OPT_EOF
= 0, OPT_HELP
,
34 OPT_INFORM
, OPT_OUTFORM
, OPT_IN
, OPT_OUT
, OPT_TEXT
, OPT_C
,
35 OPT_NOOUT
, OPT_GENKEY
, OPT_ENGINE
, OPT_VERBOSE
,
39 const OPTIONS dsaparam_options
[] = {
40 {OPT_HELP_STR
, 1, '-', "Usage: %s [options] [numbits]\n"},
42 OPT_SECTION("General"),
43 {"help", OPT_HELP
, '-', "Display this summary"},
44 # ifndef OPENSSL_NO_ENGINE
45 {"engine", OPT_ENGINE
, 's', "Use engine e, possibly a hardware device"},
49 {"in", OPT_IN
, '<', "Input file"},
50 {"inform", OPT_INFORM
, 'F', "Input format - DER or PEM"},
52 OPT_SECTION("Output"),
53 {"out", OPT_OUT
, '>', "Output file"},
54 {"outform", OPT_OUTFORM
, 'F', "Output format - DER or PEM"},
55 {"text", OPT_TEXT
, '-', "Print as text"},
56 {"C", OPT_C
, '-', "Output C code"},
57 {"noout", OPT_NOOUT
, '-', "No output"},
58 {"verbose", OPT_VERBOSE
, '-', "Verbose output"},
59 {"genkey", OPT_GENKEY
, '-', "Generate a DSA key"},
64 {"numbits", 0, 0, "Number of bits if generating parameters (optional)"},
68 int dsaparam_main(int argc
, char **argv
)
72 BIO
*in
= NULL
, *out
= NULL
;
74 int numbits
= -1, num
= 0, genkey
= 0;
75 int informat
= FORMAT_PEM
, outformat
= FORMAT_PEM
, noout
= 0, C
= 0;
76 int ret
= 1, i
, text
= 0, private = 0;
77 char *infile
= NULL
, *outfile
= NULL
, *prog
;
80 prog
= opt_init(argc
, argv
, dsaparam_options
);
81 while ((o
= opt_next()) != OPT_EOF
) {
86 BIO_printf(bio_err
, "%s: Use -help for summary.\n", prog
);
89 opt_help(dsaparam_options
);
93 if (!opt_format(opt_arg(), OPT_FMT_PEMDER
, &informat
))
100 if (!opt_format(opt_arg(), OPT_FMT_PEMDER
, &outformat
))
107 e
= setup_engine(opt_arg(), 0);
130 argc
= opt_num_rest();
134 if (!opt_int(argv
[0], &num
) || num
< 0)
139 private = genkey
? 1 : 0;
141 in
= bio_open_default(infile
, 'r', informat
);
144 out
= bio_open_owner(outfile
, outformat
, private);
149 if (numbits
> OPENSSL_DSA_MAX_MODULUS_BITS
)
151 "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
152 " Your key size is %d! Larger key size may behave not as expected.\n",
153 OPENSSL_DSA_MAX_MODULUS_BITS
, numbits
);
157 BIO_printf(bio_err
, "Error allocating BN_GENCB object\n");
160 BN_GENCB_set(cb
, dsa_cb
, bio_err
);
163 BIO_printf(bio_err
, "Error allocating DSA object\n");
167 BIO_printf(bio_err
, "Generating DSA parameters, %d bit long prime\n",
169 BIO_printf(bio_err
, "This could take some time\n");
171 if (!DSA_generate_parameters_ex(dsa
, num
, NULL
, 0, NULL
, NULL
, cb
)) {
172 ERR_print_errors(bio_err
);
173 BIO_printf(bio_err
, "Error, DSA key generation failed\n");
176 } else if (informat
== FORMAT_ASN1
) {
177 dsa
= d2i_DSAparams_bio(in
, NULL
);
179 dsa
= PEM_read_bio_DSAparams(in
, NULL
, NULL
, NULL
);
182 BIO_printf(bio_err
, "unable to load DSA parameters\n");
183 ERR_print_errors(bio_err
);
188 DSAparams_print(out
, dsa
);
192 const BIGNUM
*p
= NULL
, *q
= NULL
, *g
= NULL
;
196 DSA_get0_pqg(dsa
, &p
, &q
, &g
);
197 len
= BN_num_bytes(p
);
198 bits_p
= BN_num_bits(p
);
200 data
= app_malloc(len
+ 20, "BN space");
202 BIO_printf(bio_out
, "static DSA *get_dsa%d(void)\n{\n", bits_p
);
203 print_bignum_var(bio_out
, p
, "dsap", bits_p
, data
);
204 print_bignum_var(bio_out
, q
, "dsaq", bits_p
, data
);
205 print_bignum_var(bio_out
, g
, "dsag", bits_p
, data
);
206 BIO_printf(bio_out
, " DSA *dsa = DSA_new();\n"
207 " BIGNUM *p, *q, *g;\n"
209 BIO_printf(bio_out
, " if (dsa == NULL)\n"
211 BIO_printf(bio_out
, " if (!DSA_set0_pqg(dsa, p = BN_bin2bn(dsap_%d, sizeof(dsap_%d), NULL),\n",
213 BIO_printf(bio_out
, " q = BN_bin2bn(dsaq_%d, sizeof(dsaq_%d), NULL),\n",
215 BIO_printf(bio_out
, " g = BN_bin2bn(dsag_%d, sizeof(dsag_%d), NULL))) {\n",
217 BIO_printf(bio_out
, " DSA_free(dsa);\n"
223 " return dsa;\n}\n");
227 if (outformat
== FORMAT_ASN1
&& genkey
)
231 if (outformat
== FORMAT_ASN1
)
232 i
= i2d_DSAparams_bio(out
, dsa
);
234 i
= PEM_write_bio_DSAparams(out
, dsa
);
236 BIO_printf(bio_err
, "unable to write DSA parameters\n");
237 ERR_print_errors(bio_err
);
244 if ((dsakey
= DSAparams_dup(dsa
)) == NULL
)
246 if (!DSA_generate_key(dsakey
)) {
247 ERR_print_errors(bio_err
);
252 if (outformat
== FORMAT_ASN1
)
253 i
= i2d_DSAPrivateKey_bio(out
, dsakey
);
255 i
= PEM_write_bio_DSAPrivateKey(out
, dsakey
, NULL
, NULL
, 0, NULL
,
269 static int dsa_cb(int p
, int n
, BN_GENCB
*cb
)
271 static const char symbols
[] = ".+*\n";
272 char c
= (p
>= 0 && (size_t)p
< sizeof(symbols
) - 1) ? symbols
[p
] : '?';
277 BIO_write(BN_GENCB_get_arg(cb
), &c
, 1);
278 (void)BIO_flush(BN_GENCB_get_arg(cb
));