On Sun, Mar 01, 2015, dE wrote:
> Hi!
>
> I'm trying to create a certificate using openssl library. Here is
> the code --
>
> void main () {
> SSL_library_init();
> SSL_load_error_strings();
> OpenSSL_add_all_algorithms();
> char err[1000];
> RSA* keypair = RSA_new();
> BIGNUM *e = BN_new();
> X509 *certificate = X509_new();
> EVP_PKEY *certkeypair = EVP_PKEY_new();
>
> BN_set_word(e, 65537);
> if (!RSA_generate_key_ex(keypair, 1024, e, NULL))
> printf ("key generation failed");
> BN_free(e);
> e = NULL;
>
> EVP_PKEY_assign_RSA(certkeypair,keypair);
>
> X509_set_version (certificate , 3);
> ASN1_INTEGER_set(X509_get_serialNumber(certificate), 1);
>
> X509_NAME * certnames;
> certnames = X509_get_subject_name(certificate);
> X509_NAME_add_entry_by_txt(certnames, "C", MBSTRING_ASC,
> (unsigned char *)"global", -1, -1, 0);
> X509_NAME_add_entry_by_txt(certnames, "O", MBSTRING_ASC,
> (unsigned char *)"BIGcoin", -1, -1, 0);
> X509_NAME_add_entry_by_txt(certnames, "CN", MBSTRING_ASC,
> (unsigned char *)"My IP", -1, -1, 0);
>
> X509_set_issuer_name(certificate,certnames);
>
> X509_gmtime_adj(X509_get_notBefore(certificate), -(24*60*60));
> X509_gmtime_adj(X509_get_notAfter(certificate), (366*24*60*60));
>
> X509_sign(certificate, certkeypair, EVP_sha512());
>
> const SSL_METHOD* meth;
> meth = TLSv1_method();
> SSL_CTX* ctx;
> ctx = SSL_CTX_new(meth);
>
> SSL_CTX_use_certificate (ctx, certificate);
> SSL_CTX_use_PrivateKey (ctx, certkeypair);
>
> if (!SSL_CTX_check_private_key (ctx))
> printf ("Signature could not be verified\n");
>
> ERR_error_string(ERR_peek_last_error(), err);
> printf ("Error is %s\n", err);
> }
>
> I cant get the created certificate to be verified. It always results in --
>
> error:140A80B1:SSL routines:SSL_CTX_check_private_key:no certificate
> assigned
You're missing a call to X509_set_pubkey. Since the certificate doesn't
contain a public key it is not valid and the TLS code can't check a public key
which doesn't exist. In fact it wont even get there: if there is no key on a
certificate OpenSSL will refuse to add it as a certificate in the first place
(which is why you get the "no certificate" error).
If you checked some of your other functions for errors you'd see what was
happening: there are probably many more errors in the whole queue but you're
only seeing the last one.
Check out demos/x509/mkcert.c for an example of how to create a certificate.
Steve.
--
Dr Stephen N. Henson. OpenSSL project core developer.
Commercial tech support now available see: http://www.openssl.org
