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mkcert.c

/* Certificate creation. Demonstrates some certificate 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 mkcert(X509 **x509p, EVP_PKEY **pkeyp, int bits, int serial, int days);
int add_ext(X509 *cert, int nid, char *value);

int main(int argc, char **argv)
      {
      BIO *bio_err;
      X509 *x509=NULL;
      EVP_PKEY *pkey=NULL;

      CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);

      bio_err=BIO_new_fp(stderr, BIO_NOCLOSE);

      mkcert(&x509,&pkey,512,0,365);

      RSA_print_fp(stdout,pkey->pkey.rsa,0);
      X509_print_fp(stdout,x509);

      PEM_write_PrivateKey(stdout,pkey,NULL,NULL,0,NULL, NULL);
      PEM_write_X509(stdout,x509);

      X509_free(x509);
      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 mkcert(X509 **x509p, EVP_PKEY **pkeyp, int bits, int serial, int days)
      {
      X509 *x;
      EVP_PKEY *pk;
      RSA *rsa;
      X509_NAME *name=NULL;
      
      if ((pkeyp == NULL) || (*pkeyp == NULL))
            {
            if ((pk=EVP_PKEY_new()) == NULL)
                  {
                  abort(); 
                  return(0);
                  }
            }
      else
            pk= *pkeyp;

      if ((x509p == NULL) || (*x509p == NULL))
            {
            if ((x=X509_new()) == NULL)
                  goto err;
            }
      else
            x= *x509p;

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

      X509_set_version(x,2);
      ASN1_INTEGER_set(X509_get_serialNumber(x),serial);
      X509_gmtime_adj(X509_get_notBefore(x),0);
      X509_gmtime_adj(X509_get_notAfter(x),(long)60*60*24*days);
      X509_set_pubkey(x,pk);

      name=X509_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);

      /* Its self signed so set the issuer name to be the same as the
       * subject.
       */
      X509_set_issuer_name(x,name);

      /* Add various extensions: standard extensions */
      add_ext(x, NID_basic_constraints, "critical,CA:TRUE");
      add_ext(x, NID_key_usage, "critical,keyCertSign,cRLSign");

      add_ext(x, NID_subject_key_identifier, "hash");

      /* Some Netscape specific extensions */
      add_ext(x, NID_netscape_cert_type, "sslCA");

      add_ext(x, NID_netscape_comment, "example comment extension");


#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
      
      if (!X509_sign(x,pk,EVP_md5()))
            goto err;

      *x509p=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(X509 *cert, int nid, char *value)
      {
      X509_EXTENSION *ex;
      X509V3_CTX ctx;
      /* This sets the 'context' of the extensions. */
      /* No configuration database */
      X509V3_set_ctx_nodb(&ctx);
      /* Issuer and subject certs: both the target since it is self signed,
       * no request and no CRL
       */
      X509V3_set_ctx(&ctx, cert, cert, NULL, NULL, 0);
      ex = X509V3_EXT_conf_nid(NULL, &ctx, nid, value);
      if (!ex)
            return 0;

      X509_add_ext(cert,ex,-1);
      X509_EXTENSION_free(ex);
      return 1;
      }
      

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