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/*____________________________________________________________________________
Copyright (C) 1997 Network Associates Inc. and affiliated companies.
All rights reserved.
$Id: pgpBigNum.h,v 1.9 1999/03/10 02:47:07 heller Exp $
____________________________________________________________________________*/
#ifndef Included_pgpBigNum_h
#define Included_pgpBigNum_h
#include "pgpBase.h"
#include "pgpUtilities.h"
#include "pgpMemoryMgr.h"
PGP_BEGIN_C_DECLARATIONS
#if PRAGMA_IMPORT_SUPPORTED
#pragma import on
#endif
typedef struct PGPBigNum * PGPBigNumRef;
#define kPGPInvalidBigNumRef ( (PGPBigNumRef)NULL )
/* Creates a new bignum, secure, or plain s*/
PGPError PGPNewBigNum( PGPMemoryMgrRef mgr,
PGPBoolean secure, PGPBigNumRef *newBN );
/* destoys the bignum and all memory it uses */
PGPError PGPFreeBigNum( PGPBigNumRef bn );
/* Create a new big num with same value as src */
PGPError PGPCopyBigNum( PGPBigNumRef src, PGPBigNumRef * dest );
/* Make existing bignum dest have same value as source */
PGPError PGPAssignBigNum( PGPBigNumRef src, PGPBigNumRef dest );
/* Swap two BigNums. Very fast. */
PGPError PGPSwapBigNum( PGPBigNumRef a, PGPBigNumRef b);
/*
* Move bytes between the given buffer and the given BigNum encoded in
* base 256. I.e. after either of these, the buffer will be equal to
* (bn / 256^lsbyte) % 256^len. The difference is which is altered to
* match the other!
*/
PGPError PGPBigNumExtractBigEndianBytes( PGPBigNumRef bn,
PGPByte *dest, PGPUInt32 lsbyte, PGPUInt32 len );
PGPError PGPBigNumInsertBigEndianBytes(PGPBigNumRef bn,
PGPByte const *src, PGPUInt32 lsbyte, PGPUInt32 len );
/* The same, but the buffer is little-endian. */
PGPError PGPBigNumExtractLittleEndianBytes( PGPBigNumRef bn,
PGPByte *dest, PGPUInt32 lsbyte, PGPUInt32 len );
PGPError PGPBigNumInsertLittleEndianBytes(PGPBigNumRef bn,
PGPByte const *src, PGPUInt32 lsbyte, PGPUInt32 len );
/* Return the least-significant bits (at least 16) of the BigNum */
PGPUInt16 PGPBigNumGetLSWord( PGPBigNumRef bn );
/*
* Return the number of significant bits in the BigNum.
* 0 or 1+floor(log2(src))
*/
PGPUInt32 PGPBigNumGetSignificantBits( PGPBigNumRef bn );
/*
* Adds two bignums into dest. Faster if dest is same as lhs or rhs.
*/
PGPError PGPBigNumAdd( PGPBigNumRef lhs,
PGPBigNumRef rhs, PGPBigNumRef dest );
/*
* lhs-rhs. dest and src may be the same, but bnSetQ(dest, 0) is faster.
* if dest < src, returns error and dest is undefined.
*/
PGPError PGPBigNumSubtract( PGPBigNumRef lhs,
PGPBigNumRef rhs, PGPBigNumRef dest,
PGPBoolean *underflow );
/* Return sign (-1, 0, +1) of a-b. a <=> b --> bnCmpQ(a, b) <=> 0 */
PGPInt32 PGPBigNumCompareQ( PGPBigNumRef bn, PGPUInt16 sm );
/* dest = src, where 0 <= src < 2^16. */
PGPError PGPBigNumSetQ( PGPBigNumRef dest, PGPUInt16 sm );
/* dest = bn + sm, where 0 <= sm < 2^16 */
PGPError PGPBigNumAddQ( PGPBigNumRef bn, PGPUInt16 sm,
PGPBigNumRef dest);
/* dest = bn + sm, where 0 <= sm < 2^16 */
PGPError PGPBigNumSubtractQ( PGPBigNumRef bn, PGPUInt16 sm,
PGPBigNumRef dest, PGPBoolean *underflow);
/* Return sign (-1, 0, +1) of a-b. a <=> b --> bnCmp(a, b) <=> 0 */
PGPInt32 PGPBigNumCompare( PGPBigNumRef lhs, PGPBigNumRef rhs);
/* dest = src * src. dest may be the same as src, but it costs time. */
PGPError PGPBigNumSquare( PGPBigNumRef src, PGPBigNumRef dest);
/* dest = a * b. dest may be the same as a or b, but it costs time. */
PGPError PGPBigNumMultiply( PGPBigNumRef lhs, PGPBigNumRef rhs,
PGPBigNumRef dest);
/* dest = a * b, where 0 <= b < 2^16. dest and a may be the same. */
PGPError PGPBigNumMultiplyQ( PGPBigNumRef lhs, PGPUInt16 sm,
PGPBigNumRef dest);
/*
* q = n/d, r = n%d. r may be the same as n, but not d,
* and q may not be the same as n or d.
* re-entrancy issue: this temporarily modifies d, but restores
* it for return.
*/
PGPError PGPBigNumDivide( PGPBigNumRef numerator,
PGPBigNumRef denominator,
PGPBigNumRef quotient,
PGPBigNumRef remainder);
/*
* dest = n % d. dest and src may be the same, but not dest and d.
* re-entrancy issue: this temporarily modifies d, but restores
* it for return.
*/
PGPError PGPBigNumMod( PGPBigNumRef numerator,
PGPBigNumRef denominator,
PGPBigNumRef dest );
/* return src % d, where 0 <= d < 2^16. */
PGPUInt16 PGPBigNumModQ( PGPBigNumRef numerator,
PGPUInt16 denominator );
/* n = n^exp, modulo "mod" "mod" *must* be odd */
PGPError PGPBigNumExpMod(
PGPBigNumRef n,
PGPBigNumRef exponent,
PGPBigNumRef mod,
PGPBigNumRef dest );
/*
* dest = n1^e1 * n2^e2, modulo "mod". "mod" *must* be odd.
* dest may be the same as n1 or n2.
*/
PGPError PGPBigNumDoubleExpMod(
PGPBigNumRef n1,
PGPBigNumRef exponent1,
PGPBigNumRef n2,
PGPBigNumRef exponent2,
PGPBigNumRef mod,
PGPBigNumRef dest );
/* dest = 2^exp, modulo "mod" "mod" *must* be odd */
PGPError PGPBigNumTwoExpMod(
PGPBigNumRef exponent,
PGPBigNumRef mod,
PGPBigNumRef dest );
/* dest = gcd(a, b). The inputs may overlap arbitrarily. */
PGPError PGPBigNumGCD( PGPBigNumRef a, PGPBigNumRef b,
PGPBigNumRef dest );
/* dest = src^-1, modulo "mod". dest may be the same as src. */
PGPError PGPBigNumInv( PGPBigNumRef src,
PGPBigNumRef mod,
PGPBigNumRef dest );
/* Shift dest left "amt" places */
PGPError PGPBigNumLeftShift( PGPBigNumRef dest, PGPUInt32 amt );
/* Shift dest right "amt" places, discarding low-order bits */
PGPError PGPBigNumRightShift( PGPBigNumRef dest, PGPUInt32 amt );
/* right shift all low order 0-bits, return number of bits shifted */
PGPUInt16 PGPBigNumMakeOdd( PGPBigNumRef dest );
#if PRAGMA_IMPORT_SUPPORTED
#pragma import reset
#endif
PGP_END_C_DECLARATIONS
#endif /* Included_pgpBigNum_h */
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