EX_INDEX_APP</b> is reserved for applications to use this facility for their own structures.</p>

<p>The API described here is used by OpenSSL to manipulate exdata for specific structures. Since the application data can be anything at all it is passed and retrieved as a <b>void *</b> type.</p>

<p>The <b>CRYPTO_EX_DATA</b> type is opaque. To initialize the exdata part of a structure, call CRYPTO_new_ex_data(). This is only necessary for <b>CRYPTO_EX_INDEX_APP</b> objects.</p>

<p>Exdata types are identified