Developer Reference

Contents

MontSet

Sets the input integer big number to a value and computes the Montgomery reduction index.

Syntax

IppStatus ippsMontSet(const Ipp32u *
pModulo
, int
size
, IppsMontState *
pCtx
);
Include Files
ippcp.h
Parameters
pModulo
Pointer to the input big number modulus.
size
The size of the modulus in
Ipp32u
chunks.
pCtx
Pointer to the context
IppsMontState
capturing the modulus and the least significant word of the multiplicative inverse
Ni
.
Description
The function sets the input positive integer big number
pModulo
to be the modulus for the context
IppsMontState *
pCtx
, computes the Montgomery reduction index
k
with respect to the input big number modulus
pModulo
and the least significant 32-bit word of the multiplicative inverse
Ni
with respect to the modulus
R
, that satisfies
R
*
R
-1
-
pModulo
*
Ni
= 1.
Return Values
ippStsNoErr
Indicates no error. Any other value indicates an error or warning.
ippStsNullPtrErr
Indicates an error condition if any of the specified pointers is
NULL
.
ippStsBadModulusErr
Indicates an error condition if the modulus is not a positive odd integer.
ippStsLengthErr
Indicates an error condition if
size
is less than or equal to 0.
ippStsOutOfRangeErr
Indicates an error condition if
size
is larger than
IppsMontState
*
pCtx
.
ippStsContextMatchErr
Indicates an error condition if
pCtx
does not match the operation.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.