source: openssl/trunk/demos/x509/mkreq.c@ 808

/* Certificate request creation. Demonstrates some request related
 * operations.
 */

#include <stdio.h>
#include <stdlib.h>

#include <openssl/pem.h>
#include <openssl/conf.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif

int mkreq(X509_REQ **x509p, EVP_PKEY **pkeyp, int bits, int serial, int days);
int add_ext(STACK_OF(X509_EXTENSION) *sk, int nid, char *value);

int main(int argc, char **argv)
        {
        BIO *bio_err;
        X509_REQ *req=NULL;
        EVP_PKEY *pkey=NULL;

        CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);

        bio_err=BIO_new_fp(stderr, BIO_NOCLOSE);

        mkreq(&req,&pkey,512,0,365);

        RSA_print_fp(stdout,pkey->pkey.rsa,0);
        X509_REQ_print_fp(stdout,req);

        PEM_write_X509_REQ(stdout,req);

        X509_REQ_free(req);
        EVP_PKEY_free(pkey);

#ifndef OPENSSL_NO_ENGINE
        ENGINE_cleanup();
#endif
        CRYPTO_cleanup_all_ex_data();

        CRYPTO_mem_leaks(bio_err);
        BIO_free(bio_err);
        return(0);
        }

static void callback(int p, int n, void *arg)
        {
        char c='B';

        if (p == 0) c='.';
        if (p == 1) c='+';
        if (p == 2) c='*';
        if (p == 3) c='\n';
        fputc(c,stderr);
        }

int mkreq(X509_REQ **req, EVP_PKEY **pkeyp, int bits, int serial, int days)
        {
        X509_REQ *x;
        EVP_PKEY *pk;
        RSA *rsa;
        X509_NAME *name=NULL;
        STACK_OF(X509_EXTENSION) *exts = NULL;
        
        if ((pk=EVP_PKEY_new()) == NULL)
                goto err;

        if ((x=X509_REQ_new()) == NULL)
                goto err;

        rsa=RSA_generate_key(bits,RSA_F4,callback,NULL);
        if (!EVP_PKEY_assign_RSA(pk,rsa))
                goto err;

        rsa=NULL;

        X509_REQ_set_pubkey(x,pk);

        name=X509_REQ_get_subject_name(x);

        /* This function creates and adds the entry, working out the
         * correct string type and performing checks on its length.
         * Normally we'd check the return value for errors...
         */
        X509_NAME_add_entry_by_txt(name,"C",
                                MBSTRING_ASC, "UK", -1, -1, 0);
        X509_NAME_add_entry_by_txt(name,"CN",
                                MBSTRING_ASC, "OpenSSL Group", -1, -1, 0);

#ifdef REQUEST_EXTENSIONS
        /* Certificate requests can contain extensions, which can be used
         * to indicate the extensions the requestor would like added to 
         * their certificate. CAs might ignore them however or even choke
         * if they are present.
         */

        /* For request extensions they are all packed in a single attribute.
         * We save them in a STACK and add them all at once later...
         */

        exts = sk_X509_EXTENSION_new_null();
        /* Standard extenions */

        add_ext(exts, NID_key_usage, "critical,digitalSignature,keyEncipherment");

        /* This is a typical use for request extensions: requesting a value for
         * subject alternative name.
         */

        add_ext(exts, NID_subject_alt_name, "email:steve@openssl.org");

        /* Some Netscape specific extensions */
        add_ext(exts, NID_netscape_cert_type, "client,email");



#ifdef CUSTOM_EXT
        /* Maybe even add our own extension based on existing */
        {
                int nid;
                nid = OBJ_create("1.2.3.4", "MyAlias", "My Test Alias Extension");
                X509V3_EXT_add_alias(nid, NID_netscape_comment);
                add_ext(x, nid, "example comment alias");
        }
#endif

        /* Now we've created the extensions we add them to the request */

        X509_REQ_add_extensions(x, exts);

        sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);

#endif
        
        if (!X509_REQ_sign(x,pk,EVP_sha1()))
                goto err;

        *req=x;
        *pkeyp=pk;
        return(1);
err:
        return(0);
        }

/* Add extension using V3 code: we can set the config file as NULL
 * because we wont reference any other sections.
 */

int add_ext(STACK_OF(X509_EXTENSION) *sk, int nid, char *value)
        {
        X509_EXTENSION *ex;
        ex = X509V3_EXT_conf_nid(NULL, NULL, nid, value);
        if (!ex)
                return 0;
        sk_X509_EXTENSION_push(sk, ex);

        return 1;
        }