2 * Copyright 1995-2020 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>
18 #include <openssl/bio.h>
19 #include <openssl/err.h>
20 #include <openssl/bn.h>
21 #include <openssl/dsa.h>
22 #include <openssl/x509.h>
23 #include <openssl/pem.h>
25 static int verbose = 0;
27 static int gendsa_cb(EVP_PKEY_CTX *ctx);
29 typedef enum OPTION_choice {
30 OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
31 OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_TEXT, OPT_C,
32 OPT_NOOUT, OPT_GENKEY, OPT_ENGINE, OPT_VERBOSE,
33 OPT_R_ENUM, OPT_PROV_ENUM
36 const OPTIONS dsaparam_options[] = {
37 {OPT_HELP_STR, 1, '-', "Usage: %s [options] [numbits]\n"},
39 OPT_SECTION("General"),
40 {"help", OPT_HELP, '-', "Display this summary"},
41 #ifndef OPENSSL_NO_ENGINE
42 {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
46 {"in", OPT_IN, '<', "Input file"},
47 {"inform", OPT_INFORM, 'F', "Input format - DER or PEM"},
49 OPT_SECTION("Output"),
50 {"out", OPT_OUT, '>', "Output file"},
51 {"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"},
52 {"text", OPT_TEXT, '-', "Print as text"},
53 {"C", OPT_C, '-', "Output C code"},
54 {"noout", OPT_NOOUT, '-', "No output"},
55 {"verbose", OPT_VERBOSE, '-', "Verbose output"},
56 {"genkey", OPT_GENKEY, '-', "Generate a DSA key"},
62 {"numbits", 0, 0, "Number of bits if generating parameters (optional)"},
66 int dsaparam_main(int argc, char **argv)
69 BIO *in = NULL, *out = NULL;
70 EVP_PKEY *params = NULL, *pkey = NULL;
71 EVP_PKEY_CTX *ctx = NULL;
72 int numbits = -1, num = 0, genkey = 0;
73 int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0;
74 int ret = 1, i, text = 0, private = 0;
75 char *infile = NULL, *outfile = NULL, *prog;
78 prog = opt_init(argc, argv, dsaparam_options);
79 while ((o = opt_next()) != OPT_EOF) {
84 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
87 opt_help(dsaparam_options);
91 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
98 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
105 e = setup_engine(opt_arg(), 0);
121 if (!opt_provider(o))
132 argc = opt_num_rest();
136 if (!opt_int(argv[0], &num) || num < 0)
141 private = genkey ? 1 : 0;
143 in = bio_open_default(infile, 'r', informat);
146 out = bio_open_owner(outfile, outformat, private);
150 ctx = EVP_PKEY_CTX_new_from_name(NULL, "DSA", NULL);
153 "Error, DSA parameter generation context allocation failed\n");
157 if (numbits > OPENSSL_DSA_MAX_MODULUS_BITS)
159 "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
160 " Your key size is %d! Larger key size may behave not as expected.\n",
161 OPENSSL_DSA_MAX_MODULUS_BITS, numbits);
163 EVP_PKEY_CTX_set_cb(ctx, gendsa_cb);
164 EVP_PKEY_CTX_set_app_data(ctx, bio_err);
166 BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n",
168 BIO_printf(bio_err, "This could take some time\n");
170 if (EVP_PKEY_paramgen_init(ctx) <= 0) {
172 "Error, DSA key generation paramgen init failed\n");
175 if (!EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, num)) {
177 "Error, DSA key generation setting bit length failed\n");
180 if (EVP_PKEY_paramgen(ctx, ¶ms) <= 0) {
181 BIO_printf(bio_err, "Error, DSA key generation failed\n");
184 } else if (informat == FORMAT_ASN1) {
185 params = d2i_KeyParams_bio(EVP_PKEY_DSA, NULL, in);
187 params = PEM_read_bio_Parameters(in, NULL);
189 if (params == NULL) {
190 BIO_printf(bio_err, "Error, unable to load DSA parameters\n");
195 EVP_PKEY_print_params(out, params, 0, NULL);
199 BIGNUM *p = NULL, *q = NULL, *g = NULL;
203 EVP_PKEY_get_bn_param(params, "p", &p);
204 EVP_PKEY_get_bn_param(params, "q", &q);
205 EVP_PKEY_get_bn_param(params, "g", &g);
206 len = BN_num_bytes(p);
207 bits_p = BN_num_bits(p);
209 data = app_malloc(len + 20, "BN space");
211 BIO_printf(bio_out, "static DSA *get_dsa%d(void)\n{\n", bits_p);
212 print_bignum_var(bio_out, p, "dsap", bits_p, data);
213 print_bignum_var(bio_out, q, "dsaq", bits_p, data);
214 print_bignum_var(bio_out, g, "dsag", bits_p, data);
218 BIO_printf(bio_out, " DSA *dsa = DSA_new();\n"
219 " BIGNUM *p, *q, *g;\n"
221 BIO_printf(bio_out, " if (dsa == NULL)\n"
223 BIO_printf(bio_out, " if (!DSA_set0_pqg(dsa, p = BN_bin2bn(dsap_%d, sizeof(dsap_%d), NULL),\n",
225 BIO_printf(bio_out, " q = BN_bin2bn(dsaq_%d, sizeof(dsaq_%d), NULL),\n",
227 BIO_printf(bio_out, " g = BN_bin2bn(dsag_%d, sizeof(dsag_%d), NULL))) {\n",
229 BIO_printf(bio_out, " DSA_free(dsa);\n"
235 " return dsa;\n}\n");
239 if (outformat == FORMAT_ASN1 && genkey)
243 if (outformat == FORMAT_ASN1)
244 i = i2d_KeyParams_bio(out, params);
246 i = PEM_write_bio_Parameters(out, params);
248 BIO_printf(bio_err, "Error, unable to write DSA parameters\n");
253 EVP_PKEY_CTX_free(ctx);
254 ctx = EVP_PKEY_CTX_new(params, NULL);
257 "Error, DSA key generation context allocation failed\n");
260 if (!EVP_PKEY_keygen_init(ctx)) {
262 "Error, unable to initialise for key generation\n");
265 if (!EVP_PKEY_keygen(ctx, &pkey)) {
266 BIO_printf(bio_err, "Error, unable to generate key\n");
270 if (outformat == FORMAT_ASN1)
271 i = i2d_PrivateKey_bio(out, pkey);
273 i = PEM_write_bio_PrivateKey(out, pkey, NULL, NULL, 0, NULL, NULL);
278 ERR_print_errors(bio_err);
281 EVP_PKEY_CTX_free(ctx);
283 EVP_PKEY_free(params);
288 static int gendsa_cb(EVP_PKEY_CTX *ctx)
290 static const char symbols[] = ".+*\n";
298 b = EVP_PKEY_CTX_get_app_data(ctx);
299 p = EVP_PKEY_CTX_get_keygen_info(ctx, 0);
300 c = (p >= 0 && (size_t)p < sizeof(symbols) - 1) ? symbols[p] : '?';