HP OpenVMS Systems Documentation

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HP Open Source Security for OpenVMS Volume 1: Common Data Security Architecture > Human Recognition Service (HRS) API Functions

HRS_IdentifyMatch

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NAME

CSSM_HRS_IdentifyMatch, HRS_IdentifyMatch — Performs an identification (1-to-many) match between a ProcessedBIR and a set of stored BIRs

SYNOPSIS

#include <hrs.h>

API

CSSM_RETURN CSSMAPI CSSM_HRS_IdentifyMatch
(CSSM_HRS_HANDLE ModuleHandle,
const CSSM_HRS_FAR *MaxFARRequested,
const CSSM_HRS_FRR *MaxFRRRequested,
const CSSM_BOOL *FARPrecedence,
const CSSM_HRS_INPUT_BIR *ProcessedBIR,
const CSSM_HRS_IDENTIFY_POPULATION *Population,
CSSM_BOOL Binning,
uint32 MaxNumberOfResults,
uint32 *NumberOfResults,
CSSM_HRS_CANDIDATE_ARRAY_PTR *Candidates,
sint32 Timeout);

SPI

CSSM_RETURN CSSMHRI HRS_IdentifyMatch
(CSSM_HRS_HANDLE ModuleHandle,
const CSSM_HRS_FAR *MaxFARRequested,
const CSSM_HRS_FRR *MaxFRRRequested,
const CSSM_BOOL *FARPrecedence,
const CSSM_HRS_INPUT_BIR *ProcessedBIR,
const CSSM_HRS_IDENTIFY_POPULATION *Population,
CSSM_BOOL Binning,
uint32 MaxNumberOfResults,
uint32 *NumberOfResults,
CSSM_HRS_CANDIDATE_ARRAY_PTR *Candidates,
sint32 Timeout);

LIBRARY

HRS Extensible Module Manager (cdsa$inhrsemm_shr.exe)

PARAMETERS

The parameter definitions are the same for the API and the SPI.

ModuleHandle (input) 

The handle of the attached HRS service provider.

MaxFARRequested (input)  

The requested FAR criterion for successful verification.

MaxFRRRequested (input/optional)
  

The requested FRR criterion for successful verification. A NULL pointer indicates that this criterion is not provided.

FARPrecedence (input)  

If both criteria are provided, this parameter indicates which takes precedence: CSSM_TRUE for FAR, CSSM_FALSE for FRR.

ProcessedBIR (input) 

The BIR to be verified.

Population (input)  

The population of BIRs against which the Identify match is performed.

Binning (input)  

A Boolean indicating whether Binning is on or off. Binning is a search- optimization technique that the service provider may employ. It is based on searching the population according to the intrinsic characteristics of the biometric data. While it may improve the speed of the Match operation, it may also increase the probability of missing a candidate.

MaxNumberOfResults (input)  

Specifies the maximum number of match candidates to be returned as a result of the 1:N match. A value of zero is a request for all candidates.

NumberOfResults (output) 

Specifies the number of candidates returned in the Candidates array as a result of the 1:N match.

Candidates (output) 

A pointer to an array of CSSM_HRS_CANDIDATE_PTRs corresponding to the BIRs identified as a result of the match process (that is, indices associated with BIRs found to exceed the match threshold). This list is in rank order, with the highest scoring record being first. If no matches are found, this pointer will be set to NULL. If the Population was presented in a database, the IDs are database IDs; if the set was presented in an in-memory array, the IDs are indexes into the array.

Timeout (input)  

An integer specifying the timeout value (in milliseconds) for the operation. If this timeout is reached, the function returns an error, and no candidate list. This value can be any positive number. A ?1 value means the service provider’s default timeout value will be used.

DESCRIPTION

This function performs an identification (1-to-many) match between a ProcessedBIR and a set of stored BIRs. The ProcessedBIR is the ‘‘processed’’ BIR captured specifically for this identification. The population that the match takes place against can be presented in one of three ways:

  • In a database identified by an open database handle

  • Input in an array of BIRs

  • In the ‘‘default’’ database of the BSP (possibly stored in the biometric device)

The application must request a maximum FAR value criterion for a successful match, and may also (optionally) request a maximum FRR criterion for a successful match. If a maximum FRR value is provided, the application must also indicate, via the FARPrecedence parameter, which criteria takes precedence. The FARAchieved and, optionally, the FRRAchieved are returned for each result in the Candidate array.

NOTE: Not all service providers support 1:N identification.

Depending on the service provider and the location and size of the database to be searched, this operation can take a significant amount of time to perform.

The number of match candidates found by the service provider is dependent on the actual FAR used.

RETURN VALUE

A CSSM_RETURN value indicating success or specifying a particular error condition. The value CSSM_OK indicates success. All other values represent an error condition.

ERRORS

Errors are described in the CDSA Technical Standard.

CSSMERR_CSSM_NOT_INITIALIZED
CSSMERR_CSSM_FUNCTION_FAILED
CSSMERR_CSSM_FUNCTION_NOT_IMPLEMENTED
CSSMERR_CSSM_FUNCTION_INTEGRITY_FAIL
CSSMERR_HRS_BIR_NOT_FULLY_PROCESSED
CSSMERR_HRS_BIR_SIGNATURE_FAILURE
CSSMERR_HRS_FUNCTION_NOT_SUPPORTED
CSSMERR_HRS_INCONSISTENT_PURPOSE
CSSMERR_HRS_NO_INPUT_BIRS
CSSMERR_HRS_RECORD_NOT_FOUND
CSSMERR_HRS_TIMEOUT_EXPIRED