DLPSetDP

Sets up a particular domain parameter of the DL-based cryptosystem over GF(p).

Syntax

IppStatus ippsDLPSetDP(const IppsBigNumState* pDP, IppsDLPKeyTag tag, IppsDLPState* pCtx);

Parameters

pDP	Pointer to the domain parameter value to be set.
tag	Tag specifying the desired domain parameter.
pCtx	Pointer to the cryptosystem context.

Description

This function is declared in the ippcp.h file. The function assigns the value specified by pDP to a particular domain parameter of the DL-based cryptosystem. The domain parameter to be set up is determined by tag as follows:

If tag == IppDLPkeyP, the function assigns value to the characteristic p, the size of the prime finite field GF(p).
If tag == IppDLPkeyR, the function assigns value to the characteristic r, the prime divisor of (p-1) and the order of g.
If tag == IppDLPkeyG, the function assigns value to the characteristic g, the element of GF(p) generating a multiplicative subgroup of order r.

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.
ippStsContextMatchErr	Indicates an error condition if the context parameter does not match the operation.
ippStsRangeErr	Indicates an error condition if the Big Number specified by pDP is too big to be stored in the IppsDLPState context.
ippStsBadArgErr	Indicates an error condition if some of the function parameters are invalid: Big Number specified by pDP is negative Domain parameter specified by tag does not match the IppsDLPState context.