Index for Section 3

Alphabetical listing for V

Bottom of page

VerifyData(3)
NAME
  VerifyData, CSSM_VerifyData, CSP_VerifyData - Verify input buffer data
  (CDSA)

SYNOPSIS
  # include <cdsa/cssm.h>

       API:
       CSSM_RETURN CSSMAPI CSSM_VerifyData
       (CSSM_CC_HANDLE CCHandle,
       const CSSM_DATA *DataBufs,
       uint32 DataBufCount,
       CSSM_ALGORITHMS DigestAlgorithm,
       const CSSM_DATA *Signature)
       SPI:
       CSSM_RETURN CSSMCSPI CSP_VerifyData
       (CSSM_CSP_HANDLE CSPHandle,
       CSSM_CC_HANDLE CCHandle,
       const CSSM_CONTEXT *Context,
       const CSSM_DATA *DataBufs,
       uint32 DataBufCount,
       CSSM_ALGORITHMS DigestAlgorithm,
       const CSSM_DATA *Signature)

LIBRARY
  Common Security Services Manager library (libcssm.so)

API PARAMETERS
  CCHandle (input)
	  The handle that describes the context of this cryptographic
	  operation used to link to the CSP-managed information.

  DataBufs (input)
	  A pointer to a vector of CSSM_DATA structures that contain the data
	  to be operated on.

  DataBufCount (input)
	  The number of DataBufs to be verified.

  DigestAlgorithm (input)
	  If verifying just a digest, specifies the type of digest.  In this
	  case, the context should only specify the encryption algorithm. If
	  not verifying just a digest, it must be CSSM_ALGID_NONE. In this
	  case, the context should specify the combination digest/encryption
	  algorithm.

  Signature (input)
	  A pointer to a CSSM_DATA structure which contains the signature and
	  the size of the signature.

SPI PARAMETERS
  CSPHandle (input)
	  The handle that describes the add-in cryptographic service provider
	  module used to perform up calls to CSSM for the memory functions
	  managed by CSSM.

  Context (input)
	  Pointer to CSSM_CONTEXT structure that describes the attributes
	  with this context.

DESCRIPTION
  This function verifies all data contained in the set of input buffers based
  on the input signature.

  Verifying can include digesting the data and decrypting the digest (from
  the signature) or verifying just the digest (already calculated by the
  application).	 If digesting the data and decrypting the digest, then the
  context should specify both digest and decryption algorithms (for example,
  CSSM_ALGID_MD5WithRSA).  In this case, the DigestAlgorithm parameter must
  be set to CSSM_ALGID_NONE. If signing just the digest, then the context
  should specify just the decryption algorithm and the DigestAlgorithm
  parameter should specify the type of digest (for example, CSSM_ALGID_MD5).
  Also, DataBufCount must be 1.

  If the signing algorithm is not reversible or strictly limits the size of
  the signed data, then the algorithm can specify verification without
  digesting.  In this case, the verify operation is performed on the input
  data and the size of the input data is restricted by the service provider.

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_CSP_INPUT_LENGTH_ERROR
       CSSMERR_CSP_VERIFY_FAILED
       CSSMERR_CSP_INVALID_SIGNATURE
       CSSMERR_CSP_INVALID_DIGEST_ALGORITHM

SEE ALSO
  Books

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

  Reference Pages

  Functions for the CSSM API:

  CSSM_SignData(3), CSSM_VerifyDataInit(3), CSSM_VerifyDataUpdate(3),
  CSSM_VerifyDataFinal(3)

  Functions for the CSP SPI:

  CSP_SignData(3), CSP_VerifyDataInit(3), CSP_VerifyDataUpdate(3),
  CSP_VerifyDataFinal(3)

Index for Section 3

Alphabetical listing for V

Top of page