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CL_CertGetFirstFieldValue(3)
NAME
  CL_CertGetFirstFieldValue, CSSM_CL_CertGetFirstFieldValue - Return the
  value of the certificate field (CDSA)

SYNOPSIS
  # include <cdsa/cssm.h>

       API:
       CSSM_RETURN CSSMAPI CSSM_CL_CertGetFirstFieldValue
       (CSSM_CL_HANDLE CLHandle,
       const CSSM_DATA *Cert,
       const CSSM_OID *CertField,
       CSSM_HANDLE_PTR ResultsHandle,
       uint32 *NumberOfMatchedFields,
       CSSM_DATA_PTR *Value)
       SPI:
       CSSM_RETURN CSSMCLI CL_CertGetFirstFieldValue
       (CSSM_CL_HANDLE CLHandle,
       const CSSM_DATA *Cert,
       const CSSM_OID *CertField,
       CSSM_HANDLE_PTR ResultsHandle,
       uint32 *NumberOfMatchedFields,
       CSSM_DATA_PTR *Value)

LIBRARY
  Common Security Services Manager library (libcssm.so)

PARAMETERS
  CLHandle (input)
	  The handle that describes the add-in certificate library module
	  used to perform this function.

  Cert (input)
	  A pointer to the CSSM_DATA structure containing the certificate.

  CertField (input)
	  A pointer to an object identifier which identifies the field value
	  to be extracted from the Cert.

  ResultsHandle (output)
	  A pointer to the CSSM_HANDLE that should be used to obtain any
	  additional matching fields.

  NumberOfMatchedFields (output)
	  The total number of fields that match the CertField OID. This count
	  includes the first match, which was returned by this function.

  Value (output)
	  A pointer to the structure containing the value of the requested
	  field. The structure and the field at I "(*Value)->Data" are
	  allocated by the service provider. The CSSM_CL_FreeFieldValue()
	  (CSSM API) or CL_FreeFieldValue() (CL SPI) function can be used to
	  deallocate *Value and (*Value)->Data.

DESCRIPTION
  This function returns the value of the certificate field designated by the
  CSSM_OID CertField. The OID also identifies the data format for the field
  value returned to the caller. If multiple OIDs name the same certificate
  field, then each such OID defines a distinct data format for the returned
  field value. The function CSSM_CL_CertDescribeFormat() (CSSM API), or
  CL_CertDescribeFormat() (CL SPI), provides a list of all CSSM_OID values
  supported by a certificate library module for naming fields of a
  certificate.

  If more than one field matches the CertField OID, the first matching field
  will be returned. The number of matching fields is an output parameter, as
  is the ResultsHandle to be used to retrieve the remaining matching fields.

  The set of matching fields is determined by this function. The number of
  matching fields and the field values do not change between this function
  and subsequent calls to CSSM_CL_CertGetNextFieldValue() (CSSM API), or
  CL_CertGetNextFieldValue() (CL SPI).

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.	See CDSA_intro(3).

       CSSMERR_CL_INVALID_CERT_POINTER
       CSSMERR_CL_UNKNOWN_FORMAT
       CSSMERR_CL_UNKNOWN_TAG
       CSSMERR_CL_NO_FIELD_VALUES

SEE ALSO
  Books

  Intel CDSA Application Developer's Guide (see CDSA_intro(3))

  Reference Pages

  Functions for the CSSM API:

  CSSM_CL_CertGetNextFieldValue(3), CSSM_CL_CertAbortQuery(3),
  CSSM_CL_CertGetAllField(3), CSSM_CL_FreeFieldValue(3),
  CSSM_CL_CertDescribeFormat(3), CSSM_CL_FreeFieldValue(3)

  Functions for the CLI SPI:

  CL_CertGetNextFieldValue(3), CL_CertAbortQuery(3), CL_CertGetAllField(3),
  CL_FreeFieldValue(3), CL_CertDescribeFormat(3), CL_FreeFieldValue(3)

Index for Section 3

Alphabetical listing for C

Top of page