krb5_mk_priv -  Format a KRB-PRIV message. 
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.. c:function:: krb5_error_code krb5_mk_priv(krb5_context context, krb5_auth_context auth_context, const krb5_data * userdata, krb5_data * der_out, krb5_replay_data * rdata_out)

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:param:

	          **[in]** **context** - Library context

	          **[in]** **auth_context** - Authentication context

	          **[in]** **userdata** - User data for **KRB-PRIV** message

	          **[out]** **der_out** - Formatted **KRB-PRIV** message

	          **[out]** **rdata_out** - Replay data (NULL if not needed)


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:retval:
         -   0   Success; otherwise - Kerberos error codes


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This function is similar to :c:func:`krb5_mk_safe()` , but the message is encrypted and integrity-protected, not just integrity-protected.



The local address in *auth_context* must be set, and is used to form the sender address used in the KRB-PRIV message. The remote address is optional; if specified, it will be used to form the receiver address used in the message.



If the :data:`KRB5_AUTH_CONTEXT_DO_TIME` flag is set in *auth_context* , a timestamp is included in the KRB-PRIV message, and an entry for the message is entered in an in-memory replay cache to detect if the message is reflected by an attacker. If :data:`KRB5_AUTH_CONTEXT_DO_TIME` is not set, no replay cache is used. If :data:`KRB5_AUTH_CONTEXT_RET_TIME` is set in *auth_context* , a timestamp is included in the KRB-PRIV message and is stored in *rdata_out* .



If either :data:`KRB5_AUTH_CONTEXT_DO_SEQUENCE` or :data:`KRB5_AUTH_CONTEXT_RET_SEQUENCE` is set, the *auth_context* local sequence number is included in the KRB-PRIV message and then incremented. If :data:`KRB5_AUTH_CONTEXT_RET_SEQUENCE` is set, the sequence number used is stored in *rdata_out* .



Use :c:func:`krb5_free_data_contents()` to free *der_out* when it is no longer needed.










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.. note::

	 The *rdata_out* argument is required if the :data:`KRB5_AUTH_CONTEXT_RET_TIME` or :data:`KRB5_AUTH_CONTEXT_RET_SEQUENCE` flag is set in *auth_context* .
 



