mkcert.c revision 296465 
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
15int mkcert(X509 **x509p, EVP_PKEY **pkeyp, int bits, int serial, int days);
16int add_ext(X509 *cert, int nid, char *value);
17
18int 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
49static 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
64int 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
150int 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