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mkreq.c

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

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

#include <openssl/pem.h>
#include <openssl/conf.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_REQUEST) *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_md5()))
            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_REQUEST) *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;
      }
      

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