1 /*
2 * Certificate creation. Demonstrates some certificate related operations.
3 */
4
5 #include <stdio.h>
6 #include <stdlib.h>
7
8 #include <openssl/pem.h>
9 #include <openssl/conf.h>
10 #include <openssl/x509v3.h>
11 #ifndef OPENSSL_NO_ENGINE
12 # include <openssl/engine.h>
13 #endif
14
15 int mkcert(X509 **x509p, EVP_PKEY **pkeyp, int bits, int serial, int days);
16 int add_ext(X509 *cert, int nid, char *value);
17
main(int argc,char ** argv)18 int main(int argc, char **argv)
19 {
20 BIO *bio_err;
21 X509 *x509 = NULL;
22 EVP_PKEY *pkey = NULL;
23
24 CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
25
26 bio_err = BIO_new_fp(stderr, BIO_NOCLOSE);
27
28 mkcert(&x509, &pkey, 512, 0, 365);
29
30 RSA_print_fp(stdout, pkey->pkey.rsa, 0);
31 X509_print_fp(stdout, x509);
32
33 PEM_write_PrivateKey(stdout, pkey, NULL, NULL, 0, NULL, NULL);
34 PEM_write_X509(stdout, x509);
35
36 X509_free(x509);
37 EVP_PKEY_free(pkey);
38
39 #ifndef OPENSSL_NO_ENGINE
40 ENGINE_cleanup();
41 #endif
42 CRYPTO_cleanup_all_ex_data();
43
44 CRYPTO_mem_leaks(bio_err);
45 BIO_free(bio_err);
46 return (0);
47 }
48
callback(int p,int n,void * arg)49 static void callback(int p, int n, void *arg)
50 {
51 char c = 'B';
52
53 if (p == 0)
54 c = '.';
55 if (p == 1)
56 c = '+';
57 if (p == 2)
58 c = '*';
59 if (p == 3)
60 c = '\n';
61 fputc(c, stderr);
62 }
63
mkcert(X509 ** x509p,EVP_PKEY ** pkeyp,int bits,int serial,int days)64 int mkcert(X509 **x509p, EVP_PKEY **pkeyp, int bits, int serial, int days)
65 {
66 X509 *x;
67 EVP_PKEY *pk;
68 RSA *rsa;
69 X509_NAME *name = NULL;
70
71 if ((pkeyp == NULL) || (*pkeyp == NULL)) {
72 if ((pk = EVP_PKEY_new()) == NULL) {
73 abort();
74 return (0);
75 }
76 } else
77 pk = *pkeyp;
78
79 if ((x509p == NULL) || (*x509p == NULL)) {
80 if ((x = X509_new()) == NULL)
81 goto err;
82 } else
83 x = *x509p;
84
85 rsa = RSA_generate_key(bits, RSA_F4, callback, NULL);
86 if (!EVP_PKEY_assign_RSA(pk, rsa)) {
87 abort();
88 goto err;
89 }
90 rsa = NULL;
91
92 X509_set_version(x, 2);
93 ASN1_INTEGER_set(X509_get_serialNumber(x), serial);
94 X509_gmtime_adj(X509_get_notBefore(x), 0);
95 X509_gmtime_adj(X509_get_notAfter(x), (long)60 * 60 * 24 * days);
96 X509_set_pubkey(x, pk);
97
98 name = X509_get_subject_name(x);
99
100 /*
101 * This function creates and adds the entry, working out the correct
102 * string type and performing checks on its length. Normally we'd check
103 * the return value for errors...
104 */
105 X509_NAME_add_entry_by_txt(name, "C", MBSTRING_ASC, "UK", -1, -1, 0);
106 X509_NAME_add_entry_by_txt(name, "CN",
107 MBSTRING_ASC, "OpenSSL Group", -1, -1, 0);
108
109 /*
110 * Its self signed so set the issuer name to be the same as the subject.
111 */
112 X509_set_issuer_name(x, name);
113
114 /* Add various extensions: standard extensions */
115 add_ext(x, NID_basic_constraints, "critical,CA:TRUE");
116 add_ext(x, NID_key_usage, "critical,keyCertSign,cRLSign");
117
118 add_ext(x, NID_subject_key_identifier, "hash");
119
120 /* Some Netscape specific extensions */
121 add_ext(x, NID_netscape_cert_type, "sslCA");
122
123 add_ext(x, NID_netscape_comment, "example comment extension");
124
125 #ifdef CUSTOM_EXT
126 /* Maybe even add our own extension based on existing */
127 {
128 int nid;
129 nid = OBJ_create("1.2.3.4", "MyAlias", "My Test Alias Extension");
130 X509V3_EXT_add_alias(nid, NID_netscape_comment);
131 add_ext(x, nid, "example comment alias");
132 }
133 #endif
134
135 if (!X509_sign(x, pk, EVP_sha1()))
136 goto err;
137
138 *x509p = x;
139 *pkeyp = pk;
140 return (1);
141 err:
142 return (0);
143 }
144
145 /*
146 * Add extension using V3 code: we can set the config file as NULL because we
147 * wont reference any other sections.
148 */
149
add_ext(X509 * cert,int nid,char * value)150 int add_ext(X509 *cert, int nid, char *value)
151 {
152 X509_EXTENSION *ex;
153 X509V3_CTX ctx;
154 /* This sets the 'context' of the extensions. */
155 /* No configuration database */
156 X509V3_set_ctx_nodb(&ctx);
157 /*
158 * Issuer and subject certs: both the target since it is self signed, no
159 * request and no CRL
160 */
161 X509V3_set_ctx(&ctx, cert, cert, NULL, NULL, 0);
162 ex = X509V3_EXT_conf_nid(NULL, &ctx, nid, value);
163 if (!ex)
164 return 0;
165
166 X509_add_ext(cert, ex, -1);
167 X509_EXTENSION_free(ex);
168 return 1;
169 }
170