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/*____________________________________________________________________________
pgpHash.h
Copyright (C) 1997 Network Associates Inc. and affiliated companies.
All rights reserved.
$Id: pgpHash.h,v 1.15 1999/03/10 02:51:20 heller Exp $
____________________________________________________________________________*/
#ifndef Included_pgpHashing_h /* [ */
#define Included_pgpHashing_h
#include "pgpPubTypes.h"
#include "pgpMemoryMgr.h"
PGP_BEGIN_C_DECLARATIONS
#if PRAGMA_IMPORT_SUPPORTED
#pragma import on
#endif
/*____________________________________________________________________________
Create a new hash of the specified algorithm.
If the algorithm is not available then kPGPError_AlgorithmNotAvailable is
returned.
____________________________________________________________________________*/
PGPError PGPNewHashContext( PGPMemoryMgrRef memoryMgr,
PGPHashAlgorithm algorithm,
PGPHashContextRef * outRef );
/*____________________________________________________________________________
Any existing intermediate hash is lost.
____________________________________________________________________________*/
PGPError PGPFreeHashContext( PGPHashContextRef ref );
/*____________________________________________________________________________
An exact duplicate of the hash is made.
____________________________________________________________________________*/
PGPError PGPCopyHashContext( PGPHashContextRef ref,
PGPHashContextRef * outRef);
/*____________________________________________________________________________
Reset a hash as if it had been created anew. Any existing intermediate
hash is lost.
____________________________________________________________________________*/
PGPError PGPResetHash( PGPHashContextRef ref );
/*____________________________________________________________________________
Continue the hash, accumulating an intermediate result
____________________________________________________________________________*/
PGPError PGPContinueHash( PGPHashContextRef ref,
const void *in, PGPSize numBytes );
/*____________________________________________________________________________
Finalize the hash, depositing the result into 'hashOut'.
After calling this routine, the hash is reset via PGPResetHash().
If you want an intermediate result, use PGPCopyHash() and finalize the
copy.
____________________________________________________________________________*/
PGPError PGPFinalizeHash( PGPHashContextRef ref, void *hashOut );
/*____________________________________________________________________________
Determine size of resulting hash in bytes e.g. a 160 bit hash yields 20.
Used for generic code which may not know how big a hash is being produced.
Question: can we reasonably assume 8 bits per byte? If not, how does
PGPFinalizeHash return its result?
____________________________________________________________________________*/
PGPError PGPGetHashSize( PGPHashContextRef ref, PGPSize *hashSize );
#if PRAGMA_IMPORT_SUPPORTED
#pragma import reset
#endif
PGP_END_C_DECLARATIONS
#endif /* ] Included_pgpHashing_h */
/*__Editor_settings____
Local Variables:
tab-width: 4
End:
vi: ts=4 sw=4
vim: si
_____________________*/
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