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selfsign.c

/* NOCW */
/* cc -o ssdemo -I../include selfsign.c ../libcrypto.a */

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

#include <openssl/pem.h>
#include <openssl/conf.h>
#include <openssl/x509v3.h>

int mkit(X509 **x509p, EVP_PKEY **pkeyp, int bits, int serial, int days);

int main()
      {
      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);

      mkit(&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);

#ifdef CUSTOM_EXT
      /* Only needed if we add objects or custom extensions */
      X509V3_EXT_cleanup();
      OBJ_cleanup();
#endif

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

#ifdef WIN16
#  define MS_CALLBACK   _far _loadds
#  define MS_FAR        _far
#else
#  define MS_CALLBACK
#  define MS_FAR
#endif

static void MS_CALLBACK callback(p, n, arg)
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 mkit(x509p,pkeyp,bits,serial,days)
X509 **x509p;
EVP_PKEY **pkeyp;
int bits;
int serial;
int days;
      {
      X509 *x;
      EVP_PKEY *pk;
      RSA *rsa;
      X509_NAME *name=NULL;
      X509_NAME_ENTRY *ne=NULL;
      X509_EXTENSION *ex=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,3);
      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);

      X509_set_issuer_name(x,name);

      /* Add extension using V3 code: we can set the config file as NULL
       * because we wont reference any other sections. We can also set
         * the context to NULL because none of these extensions below will need
       * to access it.
       */

      ex = X509V3_EXT_conf_nid(NULL, NULL, NID_netscape_cert_type, "server");
      X509_add_ext(x,ex,-1);
      X509_EXTENSION_free(ex);

      ex = X509V3_EXT_conf_nid(NULL, NULL, NID_netscape_comment,
                                    "example comment extension");
      X509_add_ext(x,ex,-1);
      X509_EXTENSION_free(ex);

      ex = X509V3_EXT_conf_nid(NULL, NULL, NID_netscape_ssl_server_name,
                                          "www.openssl.org");

      X509_add_ext(x,ex,-1);
      X509_EXTENSION_free(ex);

#if 0
      /* might want something like this too.... */
      ex = X509V3_EXT_conf_nid(NULL, NULL, NID_basic_constraints,
                                          "critical,CA:TRUE");


      X509_add_ext(x,ex,-1);
      X509_EXTENSION_free(ex);
#endif

#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);
            ex = X509V3_EXT_conf_nid(NULL, NULL, nid,
                                    "example comment alias");
            X509_add_ext(x,ex,-1);
            X509_EXTENSION_free(ex);
      }
#endif
      
      if (!X509_sign(x,pk,EVP_md5()))
            goto err;

      *x509p=x;
      *pkeyp=pk;
      return(1);
err:
      return(0);
      }

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