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@nbd.name>
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 <mbedtls/bignum.h>
34 #include <mbedtls/x509_crt.h>
35 #include <mbedtls/rsa.h>
36 #include <mbedtls/pk.h>
38 #define PX5G_VERSION "0.2"
39 #define PX5G_COPY "Copyright (c) 2009 Steven Barth <steven@midlink.org>"
40 #define PX5G_LICENSE "Licensed under the GNU Lesser General Public License v2.1"
42 static int urandom_fd
;
43 static char buf
[16384];
45 static int _urandom(void *ctx
, unsigned char *out
, size_t len
)
47 read(urandom_fd
, out
, len
);
51 static void write_file(const char *path
, int len
, bool pem
)
54 const char *buf_start
= buf
;
57 buf_start
+= sizeof(buf
) - len
;
60 fprintf(stderr
, "No data to write\n");
65 fprintf(stderr
, "error: I/O error\n");
72 fwrite(buf_start
, 1, len
, f
);
76 static void write_key(mbedtls_pk_context
*key
, const char *path
, bool pem
)
81 if (mbedtls_pk_write_key_pem(key
, (void *) buf
, sizeof(buf
)) == 0)
84 len
= mbedtls_pk_write_key_der(key
, (void *) buf
, sizeof(buf
));
89 write_file(path
, len
, pem
);
92 static void gen_key(mbedtls_pk_context
*key
, int ksize
, int exp
, bool pem
)
95 fprintf(stderr
, "Generating RSA private key, %i bit long modulus\n", ksize
);
96 mbedtls_pk_setup(key
, mbedtls_pk_info_from_type(MBEDTLS_PK_RSA
));
97 if (mbedtls_rsa_gen_key(mbedtls_pk_rsa(*key
), _urandom
, NULL
, ksize
, exp
)) {
98 fprintf(stderr
, "error: key generation failed\n");
103 int rsakey(char **arg
)
105 mbedtls_pk_context key
;
106 unsigned int ksize
= 512;
111 while (*arg
&& **arg
== '-') {
112 if (!strcmp(*arg
, "-out") && arg
[1]) {
115 } else if (!strcmp(*arg
, "-3")) {
117 } else if (!strcmp(*arg
, "-der")) {
124 ksize
= (unsigned int)atoi(*arg
);
126 gen_key(&key
, ksize
, exp
, pem
);
127 write_key(&key
, path
, pem
);
129 mbedtls_pk_free(&key
);
134 int selfsigned(char **arg
)
136 mbedtls_pk_context key
;
137 mbedtls_x509write_cert cert
;
141 unsigned int ksize
= 512;
143 unsigned int days
= 30;
144 char *keypath
= NULL
, *certpath
= NULL
;
146 time_t from
= time(NULL
), to
;
147 char fstr
[20], tstr
[20], sstr
[17];
150 while (*arg
&& **arg
== '-') {
151 if (!strcmp(*arg
, "-der")) {
153 } else if (!strcmp(*arg
, "-newkey") && arg
[1]) {
154 if (strncmp(arg
[1], "rsa:", 4)) {
155 fprintf(stderr
, "error: invalid algorithm");
158 ksize
= (unsigned int)atoi(arg
[1] + 4);
160 } else if (!strcmp(*arg
, "-days") && arg
[1]) {
161 days
= (unsigned int)atoi(arg
[1]);
163 } else if (!strcmp(*arg
, "-keyout") && arg
[1]) {
166 } else if (!strcmp(*arg
, "-out") && arg
[1]) {
169 } else if (!strcmp(*arg
, "-subj") && arg
[1]) {
170 if (arg
[1][0] != '/' || strchr(arg
[1], ';')) {
171 fprintf(stderr
, "error: invalid subject");
174 subject
= calloc(strlen(arg
[1]) + 1, 1);
175 char *oldc
= arg
[1] + 1, *newc
= subject
, *delim
;
177 delim
= strchr(oldc
, '=');
179 fprintf(stderr
, "error: invalid subject");
182 memcpy(newc
, oldc
, delim
- oldc
+ 1);
183 newc
+= delim
- oldc
+ 1;
186 delim
= strchr(oldc
, '/');
188 delim
= arg
[1] + strlen(arg
[1]);
190 memcpy(newc
, oldc
, delim
- oldc
);
191 newc
+= delim
- oldc
;
200 gen_key(&key
, ksize
, exp
, pem
);
203 write_key(&key
, keypath
, pem
);
205 from
= (from
< 1000000000) ? 1000000000 : from
;
206 strftime(fstr
, sizeof(fstr
), "%Y%m%d%H%M%S", gmtime(&from
));
207 to
= from
+ 60 * 60 * 24 * days
;
210 strftime(tstr
, sizeof(tstr
), "%Y%m%d%H%M%S", gmtime(&to
));
212 fprintf(stderr
, "Generating selfsigned certificate with subject '%s'"
213 " and validity %s-%s\n", subject
, fstr
, tstr
);
215 mbedtls_x509write_crt_init(&cert
);
216 mbedtls_x509write_crt_set_md_alg(&cert
, MBEDTLS_MD_SHA256
);
217 mbedtls_x509write_crt_set_issuer_key(&cert
, &key
);
218 mbedtls_x509write_crt_set_subject_key(&cert
, &key
);
219 mbedtls_x509write_crt_set_subject_name(&cert
, subject
);
220 mbedtls_x509write_crt_set_issuer_name(&cert
, subject
);
221 mbedtls_x509write_crt_set_validity(&cert
, fstr
, tstr
);
222 mbedtls_x509write_crt_set_basic_constraints(&cert
, 0, -1);
223 mbedtls_x509write_crt_set_subject_key_identifier(&cert
);
224 mbedtls_x509write_crt_set_authority_key_identifier(&cert
);
226 _urandom(NULL
, buf
, 8);
227 for (len
= 0; len
< 8; len
++)
228 sprintf(sstr
+ len
*2, "%02x", (unsigned char) buf
[len
]);
230 mbedtls_mpi_init(&serial
);
231 mbedtls_mpi_read_string(&serial
, 16, sstr
);
232 mbedtls_x509write_crt_set_serial(&cert
, &serial
);
235 if (mbedtls_x509write_crt_pem(&cert
, (void *) buf
, sizeof(buf
), _urandom
, NULL
) < 0) {
236 fprintf(stderr
, "Failed to generate certificate\n");
242 len
= mbedtls_x509write_crt_der(&cert
, (void *) buf
, sizeof(buf
), _urandom
, NULL
);
244 fprintf(stderr
, "Failed to generate certificate: %d\n", len
);
248 write_file(certpath
, len
, pem
);
250 mbedtls_x509write_crt_free(&cert
);
251 mbedtls_mpi_free(&serial
);
252 mbedtls_pk_free(&key
);
257 int main(int argc
, char *argv
[])
259 urandom_fd
= open("/dev/urandom", O_RDONLY
);
263 } else if (!strcmp(argv
[1], "rsakey")) {
264 return rsakey(argv
+2);
265 } else if (!strcmp(argv
[1], "selfsigned")) {
266 return selfsigned(argv
+2);
270 "PX5G X.509 Certificate Generator Utility v" PX5G_VERSION
"\n" PX5G_COPY
271 "\nbased on PolarSSL by Christophe Devine and Paul Bakker\n\n");
272 fprintf(stderr
, "Usage: %s [rsakey|selfsigned]\n", *argv
);