mkcert.c

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/* 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_sha1()))
        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;
    }