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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;
}
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