krb5_mk_req_extended -  Create a KRB_AP_REQ message using supplied credentials. 
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.. c:function:: krb5_error_code krb5_mk_req_extended(krb5_context context, krb5_auth_context * auth_context, krb5_flags ap_req_options, krb5_data * in_data, krb5_creds * in_creds, krb5_data * outbuf)

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:param:

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

	          **[inout]** **auth_context** - Pre-existing or newly created auth context

	          **[in]** **ap_req_options** - :data:`AP_OPTS` options

	          **[in]** **in_data** - Application data to be checksummed in the authenticator, or NULL

	          **[in]** **in_creds** - Credentials for the service with valid ticket and key

	          **[out]** **outbuf** - **AP-REQ** message


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


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Valid *ap_req_options* are: 
 
	 - :data:`AP_OPTS_USE_SESSION_KEY` - Use the session key when creating the request used for user to user authentication.
 
 
	 - :data:`AP_OPTS_MUTUAL_REQUIRED` - Request a mutual authentication packet from the reciever.
 
 
	 - :data:`AP_OPTS_USE_SUBKEY` - Generate a subsession key from the current session key obtained from the credentials.
 
 This function creates a KRB_AP_REQ message using supplied credentials *in_creds* . *auth_context* may point to an existing auth context or to NULL, in which case a new one will be created. If *in_data* is non-null, a checksum of it will be included in the authenticator contained in the KRB_AP_REQ message. Use :c:func:`krb5_free_data_contents()` to free *outbuf* when it is no longer needed.



On successful return, the authenticator is stored in *auth_context* with the *client* and *checksum* fields nulled out. (This is to prevent pointer-sharing problems; the caller should not need these fields anyway, since the caller supplied them.)










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.. seealso::
         :c:func:`krb5_mk_req()` 
 




