+ (NSString *)CertificateGetSubjectName: (X509 *)certificateX509 {
    NSString *issuer = nil;
    if (certificateX509 != NULL) {
        X509_NAME *issuerX509Name = X509_get_subject_name(certificateX509);

        if (issuerX509Name != NULL) {
            int nid = OBJ_txt2nid("CN"); // organization
            int index = X509_NAME_get_index_by_NID(issuerX509Name, nid, -1);

            X509_NAME_ENTRY *issuerNameEntry = X509_NAME_get_entry(issuerX509Name, index);

            if (issuerNameEntry) {
                ASN1_STRING *issuerNameASN1 = X509_NAME_ENTRY_get_data(issuerNameEntry);

                if (issuerNameASN1 != NULL) {
                    unsigned char *issuerName = ASN1_STRING_data(issuerNameASN1);
                    issuer = [NSString stringWithUTF8String:(char *)issuerName];
                }
            }
        }
    }
    return issuer;
}