mkreq.c revision 296465 
1/*
2 * Certificate request creation. Demonstrates some request related
3 * operations.
4 */
5
6#include <stdio.h>
7#include <stdlib.h>
8
9#include <openssl/pem.h>
10#include <openssl/conf.h>
11#include <openssl/x509.h>
12#include <openssl/x509v3.h>
13#ifndef OPENSSL_NO_ENGINE
14# include <openssl/engine.h>
15#endif
16
17int mkreq(X509_REQ **x509p, EVP_PKEY **pkeyp, int bits, int serial, int days);
18int add_ext(STACK_OF(X509_EXTENSION) *sk, int nid, char *value);
19
20int main(int argc, char **argv)
21{
22    BIO *bio_err;
23    X509_REQ *req = NULL;
24    EVP_PKEY *pkey = NULL;
25
26    CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
27
28    bio_err = BIO_new_fp(stderr, BIO_NOCLOSE);
29
30    mkreq(&req, &pkey, 512, 0, 365);
31
32    RSA_print_fp(stdout, pkey->pkey.rsa, 0);
33    X509_REQ_print_fp(stdout, req);
34
35    PEM_write_X509_REQ(stdout, req);
36
37    X509_REQ_free(req);
38    EVP_PKEY_free(pkey);
39
40#ifndef OPENSSL_NO_ENGINE
41    ENGINE_cleanup();
42#endif
43    CRYPTO_cleanup_all_ex_data();
44
45    CRYPTO_mem_leaks(bio_err);
46    BIO_free(bio_err);
47    return (0);
48}
49
50static void callback(int p, int n, void *arg)
51{
52    char c = 'B';
53
54    if (p == 0)
55        c = '.';
56    if (p == 1)
57        c = '+';
58    if (p == 2)
59        c = '*';
60    if (p == 3)
61        c = '\n';
62    fputc(c, stderr);
63}
64
65int mkreq(X509_REQ **req, EVP_PKEY **pkeyp, int bits, int serial, int days)
66{
67    X509_REQ *x;
68    EVP_PKEY *pk;
69    RSA *rsa;
70    X509_NAME *name = NULL;
71    STACK_OF(X509_EXTENSION) *exts = NULL;
72
73    if ((pk = EVP_PKEY_new()) == NULL)
74        goto err;
75
76    if ((x = X509_REQ_new()) == NULL)
77        goto err;
78
79    rsa = RSA_generate_key(bits, RSA_F4, callback, NULL);
80    if (!EVP_PKEY_assign_RSA(pk, rsa))
81        goto err;
82
83    rsa = NULL;
84
85    X509_REQ_set_pubkey(x, pk);
86
87    name = X509_REQ_get_subject_name(x);
88
89    /*
90     * This function creates and adds the entry, working out the correct
91     * string type and performing checks on its length. Normally we'd check
92     * the return value for errors...
93     */
94    X509_NAME_add_entry_by_txt(name, "C", MBSTRING_ASC, "UK", -1, -1, 0);
95    X509_NAME_add_entry_by_txt(name, "CN",
96                               MBSTRING_ASC, "OpenSSL Group", -1, -1, 0);
97
98#ifdef REQUEST_EXTENSIONS
99    /*
100     * Certificate requests can contain extensions, which can be used to
101     * indicate the extensions the requestor would like added to their
102     * certificate. CAs might ignore them however or even choke if they are
103     * present.
104     */
105
106    /*
107     * For request extensions they are all packed in a single attribute. We
108     * save them in a STACK and add them all at once later...
109     */
110
111    exts = sk_X509_EXTENSION_new_null();
112    /* Standard extenions */
113
114    add_ext(exts, NID_key_usage, "critical,digitalSignature,keyEncipherment");
115
116    /*
117     * This is a typical use for request extensions: requesting a value for
118     * subject alternative name.
119     */
120
121    add_ext(exts, NID_subject_alt_name, "email:steve@openssl.org");
122
123    /* Some Netscape specific extensions */
124    add_ext(exts, NID_netscape_cert_type, "client,email");
125
126# ifdef CUSTOM_EXT
127    /* Maybe even add our own extension based on existing */
128    {
129        int nid;
130        nid = OBJ_create("1.2.3.4", "MyAlias", "My Test Alias Extension");
131        X509V3_EXT_add_alias(nid, NID_netscape_comment);
132        add_ext(x, nid, "example comment alias");
133    }
134# endif
135
136    /* Now we've created the extensions we add them to the request */
137
138    X509_REQ_add_extensions(x, exts);
139
140    sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
141
142#endif
143
144    if (!X509_REQ_sign(x, pk, EVP_sha1()))
145        goto err;
146
147    *req = x;
148    *pkeyp = pk;
149    return (1);
150 err:
151    return (0);
152}
153
154/*
155 * Add extension using V3 code: we can set the config file as NULL because we
156 * wont reference any other sections.
157 */
158
159int add_ext(STACK_OF(X509_EXTENSION) *sk, int nid, char *value)
160{
161    X509_EXTENSION *ex;
162    ex = X509V3_EXT_conf_nid(NULL, NULL, nid, value);
163    if (!ex)
164        return 0;
165    sk_X509_EXTENSION_push(sk, ex);
166
167    return 1;
168}
169