016098a254
Ensure that an attacker cannot force a replay attack by intercepting an SPA packet and the replaying it with the base64 version of "Salted__" (for Rindael) or the "hQ" prefix (for GnuPG). This is an important fix. The following comment was added into the fwknopd code: /* Ignore any SPA packets that contain the Rijndael or GnuPG prefixes * since an attacker might have tacked them on to a previously seen * SPA packet in an attempt to get past the replay check. And, we're * no worse off since a legitimate SPA packet that happens to include * a prefix after the outer one is stripped off won't decrypt properly * anyway because libfko would not add a new one. */ Conflicts: lib/cipher_funcs.h
50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
/*
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*****************************************************************************
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*
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* File: cipher_funcs.h
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*
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* Author: Damien S. Stuart
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*
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* Purpose: Header for the fwknop cipher_funcs.c.
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*
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* Copyright 2009-2010 Damien Stuart (dstuart@dstuart.org)
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*
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* License (GNU Public License):
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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*****************************************************************************
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*/
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#ifndef CIPHER_FUNCS_H
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#define CIPHER_FUNCS_H 1
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#include "fko_common.h"
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#include "rijndael.h"
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#include "gpgme_funcs.h"
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/* Provide the predicted encrypted data size for given input data based
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* on a 16-byte block size (for Rijndael implementation,this also accounts
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* for the 16-byte salt as well).
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*/
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#define PREDICT_ENCSIZE(x) (1+(x>>4)+(x&0xf?1:0))<<4
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size_t rij_encrypt(unsigned char *in, size_t len, const char *key, unsigned char *out);
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size_t rij_decrypt(unsigned char *in, size_t len, const char *key, unsigned char *out);
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#endif /* CIPHER_FUNCS_H */
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/***EOF***/
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