2 * px5g - Embedded x509 key and certificate generator based on PolarSSL
4 * Copyright (C) 2009 Steven Barth <steven@midlink.org>
5 * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License, version 2.1 as published by the Free Software Foundation.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
22 #include <sys/types.h>
33 #include <polarssl/bignum.h>
34 #include <polarssl/x509_crt.h>
35 #include <polarssl/rsa.h>
37 #define PX5G_VERSION "0.2"
38 #define PX5G_COPY "Copyright (c) 2009 Steven Barth <steven@midlink.org>"
39 #define PX5G_LICENSE "Licensed under the GNU Lesser General Public License v2.1"
41 static int urandom_fd
;
42 static char buf
[16384];
44 static int _urandom(void *ctx
, unsigned char *out
, size_t len
)
46 read(urandom_fd
, out
, len
);
50 static void write_file(const char *path
, int len
, bool pem
)
53 const char *buf_start
= buf
;
56 buf_start
+= sizeof(buf
) - len
;
59 fprintf(stderr
, "No data to write\n");
64 fprintf(stderr
, "error: I/O error\n");
71 fwrite(buf_start
, 1, len
, f
);
75 static void write_key(pk_context
*key
, const char *path
, bool pem
)
80 if (pk_write_key_pem(key
, (void *) buf
, sizeof(buf
)) == 0)
83 len
= pk_write_key_der(key
, (void *) buf
, sizeof(buf
));
88 write_file(path
, len
, pem
);
91 static void gen_key(pk_context
*key
, int ksize
, int exp
, bool pem
)
94 pk_init_ctx(key
, pk_info_from_type(POLARSSL_PK_RSA
));
95 fprintf(stderr
, "Generating RSA private key, %i bit long modulus\n", ksize
);
96 if (rsa_gen_key(pk_rsa(*key
), _urandom
, NULL
, ksize
, exp
)) {
97 fprintf(stderr
, "error: key generation failed\n");
102 int rsakey(char **arg
)
105 unsigned int ksize
= 512;
110 while (*arg
&& **arg
== '-') {
111 if (!strcmp(*arg
, "-out") && arg
[1]) {
114 } else if (!strcmp(*arg
, "-3")) {
116 } else if (!strcmp(*arg
, "-der")) {
123 ksize
= (unsigned int)atoi(*arg
);
125 gen_key(&key
, ksize
, exp
, pem
);
126 write_key(&key
, path
, pem
);
133 int selfsigned(char **arg
)
140 unsigned int ksize
= 512;
142 unsigned int days
= 30;
143 char *keypath
= NULL
, *certpath
= NULL
;
145 time_t from
= time(NULL
), to
;
146 char fstr
[20], tstr
[20], sstr
[17];
149 while (*arg
&& **arg
== '-') {
150 if (!strcmp(*arg
, "-der")) {
152 } else if (!strcmp(*arg
, "-newkey") && arg
[1]) {
153 if (strncmp(arg
[1], "rsa:", 4)) {
154 fprintf(stderr
, "error: invalid algorithm");
157 ksize
= (unsigned int)atoi(arg
[1] + 4);
159 } else if (!strcmp(*arg
, "-days") && arg
[1]) {
160 days
= (unsigned int)atoi(arg
[1]);
162 } else if (!strcmp(*arg
, "-keyout") && arg
[1]) {
165 } else if (!strcmp(*arg
, "-out") && arg
[1]) {
168 } else if (!strcmp(*arg
, "-subj") && arg
[1]) {
169 if (arg
[1][0] != '/' || strchr(arg
[1], ';')) {
170 fprintf(stderr
, "error: invalid subject");
173 subject
= calloc(strlen(arg
[1]) + 1, 1);
174 char *oldc
= arg
[1] + 1, *newc
= subject
, *delim
;
176 delim
= strchr(oldc
, '=');
178 fprintf(stderr
, "error: invalid subject");
181 memcpy(newc
, oldc
, delim
- oldc
+ 1);
182 newc
+= delim
- oldc
+ 1;
185 delim
= strchr(oldc
, '/');
187 delim
= arg
[1] + strlen(arg
[1]);
189 memcpy(newc
, oldc
, delim
- oldc
);
190 newc
+= delim
- oldc
;
199 gen_key(&key
, ksize
, exp
, pem
);
202 write_key(&key
, keypath
, pem
);
204 from
= (from
< 1000000000) ? 1000000000 : from
;
205 strftime(fstr
, sizeof(fstr
), "%Y%m%d%H%M%S", gmtime(&from
));
206 to
= from
+ 60 * 60 * 24 * days
;
209 strftime(tstr
, sizeof(tstr
), "%Y%m%d%H%M%S", gmtime(&to
));
211 fprintf(stderr
, "Generating selfsigned certificate with subject '%s'"
212 " and validity %s-%s\n", subject
, fstr
, tstr
);
214 x509write_crt_init(&cert
);
215 x509write_crt_set_md_alg(&cert
, POLARSSL_MD_SHA1
);
216 x509write_crt_set_issuer_key(&cert
, &key
);
217 x509write_crt_set_subject_key(&cert
, &key
);
218 x509write_crt_set_subject_name(&cert
, subject
);
219 x509write_crt_set_issuer_name(&cert
, subject
);
220 x509write_crt_set_validity(&cert
, fstr
, tstr
);
221 x509write_crt_set_basic_constraints(&cert
, 0, -1);
222 x509write_crt_set_subject_key_identifier(&cert
);
223 x509write_crt_set_authority_key_identifier(&cert
);
225 _urandom(NULL
, buf
, 8);
226 for (len
= 0; len
< 8; len
++)
227 sprintf(sstr
+ len
*2, "%02x", (unsigned char) buf
[len
]);
230 mpi_read_string(&serial
, 16, sstr
);
231 x509write_crt_set_serial(&cert
, &serial
);
234 if (x509write_crt_pem(&cert
, (void *) buf
, sizeof(buf
), _urandom
, NULL
) < 0) {
235 fprintf(stderr
, "Failed to generate certificate\n");
241 len
= x509write_crt_der(&cert
, (void *) buf
, sizeof(buf
), _urandom
, NULL
);
243 fprintf(stderr
, "Failed to generate certificate: %d\n", len
);
247 write_file(certpath
, len
, pem
);
249 x509write_crt_free(&cert
);
256 int main(int argc
, char *argv
[])
258 urandom_fd
= open("/dev/urandom", O_RDONLY
);
262 } else if (!strcmp(argv
[1], "rsakey")) {
263 return rsakey(argv
+2);
264 } else if (!strcmp(argv
[1], "selfsigned")) {
265 return selfsigned(argv
+2);
269 "PX5G X.509 Certificate Generator Utility v" PX5G_VERSION
"\n" PX5G_COPY
270 "\nbased on PolarSSL by Christophe Devine and Paul Bakker\n\n");
271 fprintf(stderr
, "Usage: %s [rsakey|selfsigned]\n", *argv
);