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 HP Open Source Security for OpenVMS Volume 1:... |
 API Functions |
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| Library Spi Parameter Notes For Api Return Value See Also | Api Parameters Description Notes For Spi Errors |
API:CSSM_RETURN CSSMAPI CSSM_DecryptDataUpdate(CSSM_CC_HANDLE CCHandle,const CSSM_DATA *CipherBufs,uint32 CipherBufCount,CSSM_DATA_PTR ClearBufs,uint32 ClearBufCount,uint32 *bytesDecrypted)SPI:CSSM_RETURN CSSMCSPI CSP_DecryptDataUpdate(CSSM_CSP_HANDLE CSPHandle,CSSM_CC_HANDLE CCHandle,const CSSM_DATA *CipherBufs,uint32 CipherBufCount,CSSM_DATA_PTR ClearBufs,uint32 ClearBufCount,uint32 *bytesDecrypted)
LIBRARY Common Security Services Manager library (
cdsa$incssm300_shr.exe) API PARAMETERS CCHandle (input) | ||
| The handle that describes the context of this cryptographicoperation used to link to the CSP-managed information. | |
CipherBufs (input) | ||
| A pointer to a vector of CSSM_DATA structures thatcontain the data to be operated on. | |
CipherBufCount (input) | ||
| The number of CipherBufs. | |
ClearBufs (output) | ||
| A pointer to a vector of CSSM_DATA structures thatcontain the decrypted data resulting from the decryption operation. | |
ClearBufCount (input) | ||
| The number of ClearBufs. | |
bytesDecrypted (output) | ||
| A pointer to uint32 for the sizeof the decrypted data in bytes. | |
SPI PARAMETER CSPHandle (input) | ||
| The handle that describes the add-in CryptographicService Provider module used to perform calls to CSSM for the memoryfunctions managed by CSSM. | |
DESCRIPTION This function continues the staged decryption process overall data in the set of input buffers. There can be algorithm-specificand token-specific rules restricting the lengths of data in CSSM_DecryptUpdate() calls, but multiple input buffers are supported. Theminimum number of buffers required to contain the resulting plain textis produced as output. Excess output buffer space is not rememberedacross staged decryption calls. Each staged call begins fillingone or more new output buffers. The CSSM_QuerySize() (CSSM API), or CSP_QuerySize() (CSP SPI), function can be used to estimate the outputbuffer size required for each update call. NOTES FOR API The output is returned to the caller either by filling thecaller-specified buffer or by using the application's declared memoryallocation functions to allocate buffer space. To specify a specific,preallocated output buffer, the caller must provide an array ofone or more CSSM_DATA structures, each containing a Length fieldvalue greater than zero and a non-NULL data pointer field value.To specify automatic output buffer allocation by the CSP, the callermust provide an array of one or more CSSM_DATA structures, eachcontaining a Length field value equal to zero and a NULL data pointerfield value. The application is always responsible for deallocatingthe memory when it is no longer needed. In-place decryption canbe done by supplying the same input and output buffers. NOTES FOR SPI The output is returned to the caller as specified in BufferManagement for Cryptographic Services. RETURN VALUE A CSSM_RETURN value indicating success or specifying a particularerror condition. The value CSSM_OK indicates success. All othervalues represent an error condition. ERRORS Errors are described in the CDSA Technical Standard. None specific to this call.
SEE ALSO BooksIntel CDSA Application Developer's Guide
Functions for the CSSM API:
CSSM_QuerySize, CSSM_DecryptData, CSSM_DecryptDataInit, CSSM_DecryptDataFinal
Functions for the CSP SPI:
CSP_QuerySize, CSP_DecryptData, CSP_DecryptDataInit, CSP_DecryptDataFinal
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