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DecryptData(3)							DecryptData(3)

NAME
       DecryptData,  CSSM_DecryptData,	CSP_DecryptData	 - Decrypt buffer data
       (CDSA)

SYNOPSIS
       # include <cdsa/cssm.h>

       API: CSSM_RETURN	 CSSMAPI  CSSM_DecryptData  (CSSM_CC_HANDLE  CCHandle,
       const   CSSM_DATA  *CipherBufs,	uint32	CipherBufCount,	 CSSM_DATA_PTR
       ClearBufs, uint32 ClearBufCount, uint32 *bytesDecrypted,	 CSSM_DATA_PTR
       RemData)	 SPI:  CSSM_RETURN  CSSMCSPI  CSP_DecryptData (CSSM_CSP_HANDLE
       CSPHandle, CSSM_CC_HANDLE CCHandle, const CSSM_CONTEXT *Context,	 const
       CSSM_DATA  *CipherBufs, uint32 CipherBufCount, CSSM_DATA_PTR ClearBufs,
       uint32 ClearBufCount, uint32  *bytesDecrypted,  CSSM_DATA_PTR  RemData,
       CSSM_PRIVILEGE Privilege)

LIBRARY
       Common Security Services Manager library (libcssm.so)

API PARAMETERS
       The  handle  that describes the context of this cryptographic operation
       used to link to the CSP-managed information.  A pointer to a vector  of
       CSSM_DATA structures that contain the data to be decrypted.  The number
       of CipherBufs.  A pointer to a vector of CSSM_DATA structures that con‐
       tain  the  decrypted data resulting from the decryption operation.  The
       number of ClearBufs.  A pointer to uint32 for the size of the decrypted
       data  in bytes.	A pointer to the CSSM_DATA structure for the remaining
       plain text if there is not enough buffer space available in the	output
       data structures.

SPI PARAMETERS
       The  handle  that  describes  the add-in cryptographic service provider
       module used to perform calls to CSSM for the memory  functions  managed
       by  CSSM.   A  pointer  to  CSSM_CONTEXT	 structure  that describes the
       attributes with this context.  The export privilege to be applied  dur‐
       ing the cryptographic operation. This parameter is forwarded to the CSP
       after CSSM verifies the	caller	and  service  provider	privilege  set
       includes the specified PRIVILEGE.

DESCRIPTION
       This  function  decrypts all data contained in the set of input buffers
       using information in the context. The CSSM_QuerySize() (CSSM  API),  or
       CSP_QuerySize()	(CSP SPI), function can be used to estimate the output
       buffer size required. The minimum number of buffers required to contain
       the  resulting  plain  text  is	produced as output.  If the plain text
       result does not fit within the set of  output  buffers,	the  remaining
       plain text is returned in the single output buffer RemData.

       The  CSP can require that the cryptographic context include access cre‐
       dentials for authentication and authorization checks when using a  pri‐
       vate key or a secret key.

NOTES FOR API
       The output is returned to the caller either by filling the caller-spec‐
       ified buffer or by using the application's declared  memory  allocation
       functions  to  allocate	buffer space. To specify a specific, pre-allo‐
       cated output buffer, the caller must provide an array of	 one  or  more
       CSSM_DATA structures, each containing a Length field value greater than
       zero and a non-NULL data pointer field value. To specify automatic out‐
       put  buffer  allocation by the CSP, the caller must provide an array of
       one or more CSSM_DATA structures, each containing a Length field	 value
       equal  to  zero and a NULL data pointer field value. The application is
       always responsible for deallocating the memory when  it	is  no	longer
       needed. In-place decryption can be done by supplying the same input and
       output buffers.

NOTES FOR SPI
       The output is returned to the caller as specified in Buffer  Management
       for Cryptographic Services.

RETURN VALUE
       A CSSM_RETURN value indicating success or specifying a particular error
       condition. The value CSSM_OK indicates success. All other values repre‐
       sent an error condition.

ERRORS
       Errors	are   described	  in   the   CDSA   technical  standard.   See
       CDSA_intro(3).	  CSSMERR_CSP_BLOCK_SIZE_MISMATCH     CSSMERR_CSP_OUT‐
       PUT_LENGTH_ERROR

SEE ALSO
       Books

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

       Reference Pages

       Functions for the CSSM API:

       CSSM_QuerySize(3),     CSSM_EncryptData(3),    CSSM_DecryptDataInit(3),
       CSSM_DecryptDataUpdate(3), CSSM_DecryptDataFinal(3),  CSSM_DecryptP(3),
       CSSM_DecryptDataInitP(3)

       Functions for the CSP SPI:

       CSP_QuerySize(3),      CSP_EncryptData(3),      CSP_DecryptDataInit(3),
       CSP_DecryptDataUpdate(3), CSP_DecryptDataFinal(3)

								DecryptData(3)
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