selfsign.c

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/* 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);
    }