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1 | /* | |
2 | * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved. | |
3 | * | |
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 | |
8 | */ | |
9 | ||
10 | #include <openssl/opensslconf.h> | |
11 | #ifdef OPENSSL_NO_DSA | |
12 | NON_EMPTY_TRANSLATION_UNIT | |
13 | #else | |
14 | ||
15 | # include <stdio.h> | |
16 | # include <stdlib.h> | |
17 | # include <time.h> | |
18 | # include <string.h> | |
19 | # include "apps.h" | |
20 | # include "progs.h" | |
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> | |
27 | ||
28 | static int verbose = 0; | |
29 | ||
30 | static int dsa_cb(int p, int n, BN_GENCB *cb); | |
31 | ||
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, | |
36 | OPT_R_ENUM | |
37 | } OPTION_CHOICE; | |
38 | ||
39 | const OPTIONS dsaparam_options[] = { | |
40 | {"help", OPT_HELP, '-', "Display this summary"}, | |
41 | {"inform", OPT_INFORM, 'F', "Input format - DER or PEM"}, | |
42 | {"in", OPT_IN, '<', "Input file"}, | |
43 | {"outform", OPT_OUTFORM, 'F', "Output format - DER or PEM"}, | |
44 | {"out", OPT_OUT, '>', "Output file"}, | |
45 | {"text", OPT_TEXT, '-', "Print as text"}, | |
46 | {"C", OPT_C, '-', "Output C code"}, | |
47 | {"noout", OPT_NOOUT, '-', "No output"}, | |
48 | {"genkey", OPT_GENKEY, '-', "Generate a DSA key"}, | |
49 | OPT_R_OPTIONS, | |
50 | # ifndef OPENSSL_NO_ENGINE | |
51 | {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"}, | |
52 | # endif | |
53 | {"verbose", OPT_VERBOSE, '-', "Verbose output"}, | |
54 | {NULL} | |
55 | }; | |
56 | ||
57 | int dsaparam_main(int argc, char **argv) | |
58 | { | |
59 | ENGINE *e = NULL; | |
60 | DSA *dsa = NULL; | |
61 | BIO *in = NULL, *out = NULL; | |
62 | BN_GENCB *cb = NULL; | |
63 | int numbits = -1, num = 0, genkey = 0; | |
64 | int informat = FORMAT_PEM, outformat = FORMAT_PEM, noout = 0, C = 0; | |
65 | int ret = 1, i, text = 0, private = 0; | |
66 | char *infile = NULL, *outfile = NULL, *prog; | |
67 | OPTION_CHOICE o; | |
68 | ||
69 | prog = opt_init(argc, argv, dsaparam_options); | |
70 | while ((o = opt_next()) != OPT_EOF) { | |
71 | switch (o) { | |
72 | case OPT_EOF: | |
73 | case OPT_ERR: | |
74 | opthelp: | |
75 | BIO_printf(bio_err, "%s: Use -help for summary.\n", prog); | |
76 | goto end; | |
77 | case OPT_HELP: | |
78 | opt_help(dsaparam_options); | |
79 | ret = 0; | |
80 | goto end; | |
81 | case OPT_INFORM: | |
82 | if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat)) | |
83 | goto opthelp; | |
84 | break; | |
85 | case OPT_IN: | |
86 | infile = opt_arg(); | |
87 | break; | |
88 | case OPT_OUTFORM: | |
89 | if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat)) | |
90 | goto opthelp; | |
91 | break; | |
92 | case OPT_OUT: | |
93 | outfile = opt_arg(); | |
94 | break; | |
95 | case OPT_ENGINE: | |
96 | e = setup_engine(opt_arg(), 0); | |
97 | break; | |
98 | case OPT_TEXT: | |
99 | text = 1; | |
100 | break; | |
101 | case OPT_C: | |
102 | C = 1; | |
103 | break; | |
104 | case OPT_GENKEY: | |
105 | genkey = 1; | |
106 | break; | |
107 | case OPT_R_CASES: | |
108 | if (!opt_rand(o)) | |
109 | goto end; | |
110 | break; | |
111 | case OPT_NOOUT: | |
112 | noout = 1; | |
113 | break; | |
114 | case OPT_VERBOSE: | |
115 | verbose = 1; | |
116 | break; | |
117 | } | |
118 | } | |
119 | argc = opt_num_rest(); | |
120 | argv = opt_rest(); | |
121 | ||
122 | if (argc == 1) { | |
123 | if (!opt_int(argv[0], &num) || num < 0) | |
124 | goto end; | |
125 | /* generate a key */ | |
126 | numbits = num; | |
127 | } | |
128 | private = genkey ? 1 : 0; | |
129 | ||
130 | in = bio_open_default(infile, 'r', informat); | |
131 | if (in == NULL) | |
132 | goto end; | |
133 | out = bio_open_owner(outfile, outformat, private); | |
134 | if (out == NULL) | |
135 | goto end; | |
136 | ||
137 | if (numbits > 0) { | |
138 | if (numbits > OPENSSL_DSA_MAX_MODULUS_BITS) | |
139 | BIO_printf(bio_err, | |
140 | "Warning: It is not recommended to use more than %d bit for DSA keys.\n" | |
141 | " Your key size is %d! Larger key size may behave not as expected.\n", | |
142 | OPENSSL_DSA_MAX_MODULUS_BITS, numbits); | |
143 | ||
144 | cb = BN_GENCB_new(); | |
145 | if (cb == NULL) { | |
146 | BIO_printf(bio_err, "Error allocating BN_GENCB object\n"); | |
147 | goto end; | |
148 | } | |
149 | BN_GENCB_set(cb, dsa_cb, bio_err); | |
150 | dsa = DSA_new(); | |
151 | if (dsa == NULL) { | |
152 | BIO_printf(bio_err, "Error allocating DSA object\n"); | |
153 | goto end; | |
154 | } | |
155 | if (verbose) { | |
156 | BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n", | |
157 | num); | |
158 | BIO_printf(bio_err, "This could take some time\n"); | |
159 | } | |
160 | if (!DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL, cb)) { | |
161 | ERR_print_errors(bio_err); | |
162 | BIO_printf(bio_err, "Error, DSA key generation failed\n"); | |
163 | goto end; | |
164 | } | |
165 | } else if (informat == FORMAT_ASN1) { | |
166 | dsa = d2i_DSAparams_bio(in, NULL); | |
167 | } else { | |
168 | dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL); | |
169 | } | |
170 | if (dsa == NULL) { | |
171 | BIO_printf(bio_err, "unable to load DSA parameters\n"); | |
172 | ERR_print_errors(bio_err); | |
173 | goto end; | |
174 | } | |
175 | ||
176 | if (text) { | |
177 | DSAparams_print(out, dsa); | |
178 | } | |
179 | ||
180 | if (C) { | |
181 | const BIGNUM *p = NULL, *q = NULL, *g = NULL; | |
182 | unsigned char *data; | |
183 | int len, bits_p; | |
184 | ||
185 | DSA_get0_pqg(dsa, &p, &q, &g); | |
186 | len = BN_num_bytes(p); | |
187 | bits_p = BN_num_bits(p); | |
188 | ||
189 | data = app_malloc(len + 20, "BN space"); | |
190 | ||
191 | BIO_printf(bio_out, "static DSA *get_dsa%d(void)\n{\n", bits_p); | |
192 | print_bignum_var(bio_out, p, "dsap", bits_p, data); | |
193 | print_bignum_var(bio_out, q, "dsaq", bits_p, data); | |
194 | print_bignum_var(bio_out, g, "dsag", bits_p, data); | |
195 | BIO_printf(bio_out, " DSA *dsa = DSA_new();\n" | |
196 | " BIGNUM *p, *q, *g;\n" | |
197 | "\n"); | |
198 | BIO_printf(bio_out, " if (dsa == NULL)\n" | |
199 | " return NULL;\n"); | |
200 | BIO_printf(bio_out, " if (!DSA_set0_pqg(dsa, p = BN_bin2bn(dsap_%d, sizeof(dsap_%d), NULL),\n", | |
201 | bits_p, bits_p); | |
202 | BIO_printf(bio_out, " q = BN_bin2bn(dsaq_%d, sizeof(dsaq_%d), NULL),\n", | |
203 | bits_p, bits_p); | |
204 | BIO_printf(bio_out, " g = BN_bin2bn(dsag_%d, sizeof(dsag_%d), NULL))) {\n", | |
205 | bits_p, bits_p); | |
206 | BIO_printf(bio_out, " DSA_free(dsa);\n" | |
207 | " BN_free(p);\n" | |
208 | " BN_free(q);\n" | |
209 | " BN_free(g);\n" | |
210 | " return NULL;\n" | |
211 | " }\n" | |
212 | " return dsa;\n}\n"); | |
213 | OPENSSL_free(data); | |
214 | } | |
215 | ||
216 | if (outformat == FORMAT_ASN1 && genkey) | |
217 | noout = 1; | |
218 | ||
219 | if (!noout) { | |
220 | if (outformat == FORMAT_ASN1) | |
221 | i = i2d_DSAparams_bio(out, dsa); | |
222 | else | |
223 | i = PEM_write_bio_DSAparams(out, dsa); | |
224 | if (!i) { | |
225 | BIO_printf(bio_err, "unable to write DSA parameters\n"); | |
226 | ERR_print_errors(bio_err); | |
227 | goto end; | |
228 | } | |
229 | } | |
230 | if (genkey) { | |
231 | DSA *dsakey; | |
232 | ||
233 | if ((dsakey = DSAparams_dup(dsa)) == NULL) | |
234 | goto end; | |
235 | if (!DSA_generate_key(dsakey)) { | |
236 | ERR_print_errors(bio_err); | |
237 | DSA_free(dsakey); | |
238 | goto end; | |
239 | } | |
240 | assert(private); | |
241 | if (outformat == FORMAT_ASN1) | |
242 | i = i2d_DSAPrivateKey_bio(out, dsakey); | |
243 | else | |
244 | i = PEM_write_bio_DSAPrivateKey(out, dsakey, NULL, NULL, 0, NULL, | |
245 | NULL); | |
246 | DSA_free(dsakey); | |
247 | } | |
248 | ret = 0; | |
249 | end: | |
250 | BN_GENCB_free(cb); | |
251 | BIO_free(in); | |
252 | BIO_free_all(out); | |
253 | DSA_free(dsa); | |
254 | release_engine(e); | |
255 | return ret; | |
256 | } | |
257 | ||
258 | static int dsa_cb(int p, int n, BN_GENCB *cb) | |
259 | { | |
260 | static const char symbols[] = ".+*\n"; | |
261 | char c = (p >= 0 && (size_t)p < sizeof(symbols) - 1) ? symbols[p] : '?'; | |
262 | ||
263 | if (!verbose) | |
264 | return 1; | |
265 | ||
266 | BIO_write(BN_GENCB_get_arg(cb), &c, 1); | |
267 | (void)BIO_flush(BN_GENCB_get_arg(cb)); | |
268 | return 1; | |
269 | } | |
270 | #endif |