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65 lines
2.4 KiB
65 lines
2.4 KiB
/**
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* (C) 2007-18 - ntop.org and contributors
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not see see <http://www.gnu.org/licenses/>
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*
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*/
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#if !defined(N2N_TRANSFORMS_H_)
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#define N2N_TRANSFORMS_H_
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#include "n2n_wire.h"
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#define N2N_TRANSFORM_ID_USER_START 64
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#define N2N_TRANSFORM_ID_MAX 65535
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typedef enum n2n_transform {
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N2N_TRANSFORM_ID_INVAL = 0,
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N2N_TRANSFORM_ID_NULL = 1,
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N2N_TRANSFORM_ID_TWOFISH = 2,
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N2N_TRANSFORM_ID_AESCBC = 3,
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} n2n_transform_t;
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struct n2n_trans_op;
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typedef int (*n2n_transdeinit_f)( struct n2n_trans_op * arg );
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typedef void (*n2n_transtick_f)( struct n2n_trans_op * arg, time_t now );
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typedef int (*n2n_transform_f)( struct n2n_trans_op * arg,
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uint8_t * outbuf,
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size_t out_len,
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const uint8_t * inbuf,
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size_t in_len,
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const n2n_mac_t peer_mac);
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/** Holds the info associated with a data transform plugin.
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*
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* When a packet arrives the transform ID is extracted. This defines the code
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* to use to decode the packet content. The transform code then decodes the
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* packet and consults its internal key lookup.
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*/
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typedef struct n2n_trans_op {
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void * priv; /* opaque data. Key schedule goes here. */
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uint8_t no_encryption; /* 1 if this transop does not perform encryption */
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n2n_transform_t transform_id;
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size_t tx_cnt;
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size_t rx_cnt;
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n2n_transdeinit_f deinit; /* destructor function */
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n2n_transtick_f tick; /* periodic maintenance */
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n2n_transform_f fwd; /* encode a payload */
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n2n_transform_f rev; /* decode a payload */
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} n2n_trans_op_t;
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#endif /* #if !defined(N2N_TRANSFORMS_H_) */
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