91 lines
2.9 KiB
C
91 lines
2.9 KiB
C
/*
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* Scyther : An automatic verifier for security protocols.
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* Copyright (C) 2007 Cas Cremers
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*
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* This program 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef KNOWLEDGE
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#define KNOWLEDGE
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#include "term.h"
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#include "termlist.h"
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//! Knowledge structure.
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/**
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* Contains a miminal representation of a knowledge set.
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*/
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struct knowledge
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{
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//! A list of non-encrypted terms.
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Termlist basic;
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//! A list of terms encrypted, such that the inverse is not in the knowledge set.
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Termlist encrypt;
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//! List of inverse pairs (thus length of list is even)
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Termlist inverses;
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//! List of open variables in the knowledge set.
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/**
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* This list is used to determine whether the knowledge needs to be rewritten.
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* If a new substitution is done, one of the elements of this list will become closed,
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* and we need to reconstruct the knowledge set.
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*/
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Termlist vars; // special: denotes unsubstituted variables
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};
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//! Shorthand for knowledge pointer.
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typedef struct knowledge *Knowledge;
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void knowledgeInit (void);
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void knowledgeDone (void);
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Knowledge makeKnowledge ();
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Knowledge emptyKnowledge ();
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Knowledge knowledgeDuplicate (Knowledge know);
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void knowledgeDelete (Knowledge know);
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void knowledgeDestroy (Knowledge know);
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int knowledgeAddTerm (Knowledge know, Term term);
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int knowledgeAddTermlist (Knowledge know, Termlist tl);
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void knowledgeAddInverse (Knowledge know, Term t1, Term t2);
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void knowledgeSetInverses (Knowledge know, Termlist tl);
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void knowledgeSimplify (Knowledge know, Term decryptkey);
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int inKnowledge (const Knowledge know, Term term);
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void knowledgePrint (Knowledge know);
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void knowledgePrintShort (const Knowledge know);
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void knowledgeInversesPrint (Knowledge know);
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Termlist knowledgeSet (const Knowledge know);
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Termlist knowledgeGetInverses (const Knowledge know);
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int knowledgeSubstNeeded (const Knowledge know);
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Knowledge knowledgeSubstDo (const Knowledge know);
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//! Harnass macro for recursive procedures.
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#define mindwipe(k,recurse) \
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Termlist tl; \
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int flag; \
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if (k != NULL && k->vars != NULL) { \
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tl = k->vars; \
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while (tl != NULL) { \
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if (tl->term->subst != NULL) { \
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Term oldsubst = tl->term->subst; \
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tl->term->subst = NULL; \
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flag = recurse; \
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tl->term->subst = oldsubst; \
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return flag; \
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} \
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tl = tl->next; \
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} \
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} \
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#endif
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