X509_verify()
X509_sign()

X509_get_version()
X509_get_serialNumber()
X509_get_issuer()
X509_get_subject()
X509_get_notBefore()
X509_get_notAfter()
X509_get_pubkey()

X509_set_version()
X509_set_serialNumber()
X509_set_issuer()
X509_set_subject()
X509_set_notBefore()
X509_set_notAfter()
X509_set_pubkey()

X509_get_extensions()
X509_set_extensions()

X509_EXTENSIONS_clear()
X509_EXTENSIONS_retrieve()
X509_EXTENSIONS_add()
X509_EXTENSIONS_delete()