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/** @file
* Encryption and decryption routines implementing the EAX' encryption mode
* Copyright 2010, Edward J. Beroset, edward.j.beroset@us.elster.com
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef _EAX_H
#define _EAX_H
#include <wireshark.h>
typedef struct tagMAC_T
{
uint8_t Mac[4];
} MAC_T;
#define EAX_MODE_CLEARTEXT_AUTH 1
#define EAX_MODE_CIPHERTEXT_AUTH 2
#define EAX_SIZEOF_KEY 16
/*!
Decrypts cleartext data using EAX' mode (see ANSI Standard C12.22-2008).
@param[in] pN pointer to cleartext (canonified form)
@param[in] pK pointer to secret key
@param[in,out] pC pointer to ciphertext
@param[in] SizeN byte length of cleartext (pN) buffer
@param[in] SizeK byte length of secret key (pK)
@param[in] SizeC byte length of ciphertext (pC) buffer
@param[in] pMac four-byte Message Authentication Code
@param[in] Mode EAX_MODE_CLEARTEXT_AUTH or EAX_MODE_CIPHERTEXT_AUTH
@return true if message has been authenticated; false if not
authenticated, invalid Mode or error
*/
WS_DLL_PUBLIC
bool Eax_Decrypt(uint8_t *pN, uint8_t *pK, uint8_t *pC,
uint32_t SizeN, uint32_t SizeK, uint32_t SizeC, MAC_T *pMac,
uint8_t Mode);
#endif
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