typedef struct x509_st
 
{
 X509_CINF *cert_info;
       X509_ALGOR *sig_alg;
        ASN1_BIT_STRING *signature;
 int valid;
  int references;
     char *name;
 CRYPTO_EX_DATA ex_data;
 
        /* These contain copies of various extension values */
 
 long ex_pathlen;
    unsigned long ex_flags;
     unsigned long ex_kusage;
    unsigned long ex_xkusage;
   unsigned long ex_nscert;
    ASN1_OCTET_STRING *skid;
    struct AUTHORITY_KEYID_st *akid;
 
#ifndef NO_SHA
     unsigned char sha1_hash[SHA_DIGEST_LENGTH];
#endif
 
  X509_CERT_AUX *aux;
 
} X509;