2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
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
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 dsa_cb(int p
, int n
, BN_GENCB
*cb
);
30 typedef enum OPTION_choice
{
31 OPT_ERR
= -1, OPT_EOF
= 0, OPT_HELP
,
32 OPT_INFORM
, OPT_OUTFORM
, OPT_IN
, OPT_OUT
, OPT_TEXT
, OPT_C
,
33 OPT_NOOUT
, OPT_GENKEY
, OPT_ENGINE
, OPT_R_ENUM
36 const OPTIONS dsaparam_options
[] = {
37 {"help", OPT_HELP
, '-', "Display this summary"},
38 {"inform", OPT_INFORM
, 'F', "Input format - DER or PEM"},
39 {"in", OPT_IN
, '<', "Input file"},
40 {"outform", OPT_OUTFORM
, 'F', "Output format - DER or PEM"},
41 {"out", OPT_OUT
, '>', "Output file"},
42 {"text", OPT_TEXT
, '-', "Print as text"},
43 {"C", OPT_C
, '-', "Output C code"},
44 {"noout", OPT_NOOUT
, '-', "No output"},
45 {"genkey", OPT_GENKEY
, '-', "Generate a DSA key"},
47 # ifndef OPENSSL_NO_ENGINE
48 {"engine", OPT_ENGINE
, 's', "Use engine e, possibly a hardware device"},
53 int dsaparam_main(int argc
, char **argv
)
57 BIO
*in
= NULL
, *out
= NULL
;
59 int numbits
= -1, num
= 0, genkey
= 0;
60 int informat
= FORMAT_PEM
, outformat
= FORMAT_PEM
, noout
= 0, C
= 0;
61 int ret
= 1, i
, text
= 0, private = 0;
62 char *infile
= NULL
, *outfile
= NULL
, *prog
;
65 prog
= opt_init(argc
, argv
, dsaparam_options
);
66 while ((o
= opt_next()) != OPT_EOF
) {
71 BIO_printf(bio_err
, "%s: Use -help for summary.\n", prog
);
74 opt_help(dsaparam_options
);
78 if (!opt_format(opt_arg(), OPT_FMT_PEMDER
, &informat
))
85 if (!opt_format(opt_arg(), OPT_FMT_PEMDER
, &outformat
))
92 e
= setup_engine(opt_arg(), 0);
112 argc
= opt_num_rest();
116 if (!opt_int(argv
[0], &num
) || num
< 0)
121 private = genkey
? 1 : 0;
123 in
= bio_open_default(infile
, 'r', informat
);
126 out
= bio_open_owner(outfile
, outformat
, private);
131 if (numbits
> OPENSSL_DSA_MAX_MODULUS_BITS
)
133 "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
134 " Your key size is %d! Larger key size may behave not as expected.\n",
135 OPENSSL_DSA_MAX_MODULUS_BITS
, numbits
);
139 BIO_printf(bio_err
, "Error allocating BN_GENCB object\n");
142 BN_GENCB_set(cb
, dsa_cb
, bio_err
);
145 BIO_printf(bio_err
, "Error allocating DSA object\n");
148 BIO_printf(bio_err
, "Generating DSA parameters, %d bit long prime\n",
150 BIO_printf(bio_err
, "This could take some time\n");
151 if (!DSA_generate_parameters_ex(dsa
, num
, NULL
, 0, NULL
, NULL
, cb
)) {
152 ERR_print_errors(bio_err
);
153 BIO_printf(bio_err
, "Error, DSA key generation failed\n");
156 } else if (informat
== FORMAT_ASN1
) {
157 dsa
= d2i_DSAparams_bio(in
, NULL
);
159 dsa
= PEM_read_bio_DSAparams(in
, NULL
, NULL
, NULL
);
162 BIO_printf(bio_err
, "unable to load DSA parameters\n");
163 ERR_print_errors(bio_err
);
168 DSAparams_print(out
, dsa
);
172 const BIGNUM
*p
= NULL
, *q
= NULL
, *g
= NULL
;
176 DSA_get0_pqg(dsa
, &p
, &q
, &g
);
177 len
= BN_num_bytes(p
);
178 bits_p
= BN_num_bits(p
);
180 data
= app_malloc(len
+ 20, "BN space");
182 BIO_printf(bio_out
, "static DSA *get_dsa%d(void)\n{\n", bits_p
);
183 print_bignum_var(bio_out
, p
, "dsap", bits_p
, data
);
184 print_bignum_var(bio_out
, q
, "dsaq", bits_p
, data
);
185 print_bignum_var(bio_out
, g
, "dsag", bits_p
, data
);
186 BIO_printf(bio_out
, " DSA *dsa = DSA_new();\n"
187 " BIGNUM *p, *q, *g;\n"
189 BIO_printf(bio_out
, " if (dsa == NULL)\n"
191 BIO_printf(bio_out
, " if (!DSA_set0_pqg(dsa, p = BN_bin2bn(dsap_%d, sizeof(dsap_%d), NULL),\n",
193 BIO_printf(bio_out
, " q = BN_bin2bn(dsaq_%d, sizeof(dsaq_%d), NULL),\n",
195 BIO_printf(bio_out
, " g = BN_bin2bn(dsag_%d, sizeof(dsag_%d), NULL))) {\n",
197 BIO_printf(bio_out
, " DSA_free(dsa);\n"
203 " return dsa;\n}\n");
207 if (outformat
== FORMAT_ASN1
&& genkey
)
211 if (outformat
== FORMAT_ASN1
)
212 i
= i2d_DSAparams_bio(out
, dsa
);
214 i
= PEM_write_bio_DSAparams(out
, dsa
);
216 BIO_printf(bio_err
, "unable to write DSA parameters\n");
217 ERR_print_errors(bio_err
);
224 if ((dsakey
= DSAparams_dup(dsa
)) == NULL
)
226 if (!DSA_generate_key(dsakey
)) {
227 ERR_print_errors(bio_err
);
232 if (outformat
== FORMAT_ASN1
)
233 i
= i2d_DSAPrivateKey_bio(out
, dsakey
);
235 i
= PEM_write_bio_DSAPrivateKey(out
, dsakey
, NULL
, NULL
, 0, NULL
,
249 static int dsa_cb(int p
, int n
, BN_GENCB
*cb
)
251 static const char symbols
[] = ".+*\n";
252 char c
= (p
>= 0 && (size_t)p
< sizeof(symbols
) - 1) ? symbols
[p
] : '?';
254 BIO_write(BN_GENCB_get_arg(cb
), &c
, 1);
255 (void)BIO_flush(BN_GENCB_get_arg(cb
));