NAME

DecryptDataFinal, CSSM_DecryptDataFinal, CSP_DecryptDataFinal − Finalize staged decryption process (CDSA)

SYNOPSIS

# include <cdsa/cssm.h>

API:
CSSM_RETURN CSSMAPI CSSM_DecryptDataFinal
(CSSM_CC_HANDLE CCHandle,
CSSM_DATA_PTR RemData)
SPI:
CSSM_RETURN CSSMCSPI CSP_DecryptDataFinal
(CSSM_CSP_HANDLE CSPHandle,
CSSM_CC_HANDLE CCHandle,
CSSM_DATA_PTR RemData)

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.

RemData (output)
A pointer to the CSSM_DATA structure for the last decrypted block, if necessary.

SPI PARAMETERS

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

DESCRIPTION

This function finalizes the staged decryption process by returning any remaining plain text not returned in the previous staged decryption call.  The plain text is returned in a single buffer. 

NOTES FOR API

The output is returned to the caller either by filling the caller-specified buffer or by using the application’s declared memory allocation functions to allocate buffer space. To specify a specific, pre-allocated 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 output 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. 

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 represent an error condition. 

ERRORS

Errors are described in the CDSA technical standard.  See CDSA_intro(3). 

CSSMERR_CSP_BLOCK_SIZE_MISMATCH
CSSMERR_CSP_OUTPUT_LENGTH_ERROR

SEE ALSO

Books

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

Reference Pages

Functions for the CSSM API:

CSSM_DecryptData(3), CSSM_DecryptDataInit(3), CSSM_DecryptDataUpdate(3)

Functions for the CSP SPI:

CSP_DecryptData(3), CSP_DecryptDataInit(3), CSP_DecryptDataUpdate(3)