CSSM_DecryptDataUpdate
CSSM_RETURN CSSMAPI CSSM_DecryptDataUpdate
(CSSM_CC_HANDLE CCHandle,
const CSSM_DATA_PTR CipherBufs,
uint32 CipherBufCount,
CSSM_DATA_PTR ClearBufs,
uint32 ClearBufCount,
uint32 *bytesDecrypted)
This function updates the staged decrypt function. The CSSM_QuerySize function can be used to estimate the output buffer size required for each update call. There may be algorithm-specific and token-specific rules restricting the lengths of data in CSSM_DecryptUpdate calls.
- CCHandle (input)
The handle that describes the context of this cryptographic operation used to link to the CSP-managed information.
- CipherBufs (input)
A pointer to a vector of CSSM_DATA structures that contain the data to be operated on.
- CipherBufCount (input)
The number of CipherBufs.
- ClearBufs (output)
A pointer to a vector of CSSM_DATA structures that contain the decrypted data resulting from the decryption operation.
- ClearBufCount (input)
The number of ClearBufs.
- bytesDecrypted (output)
A pointer to uint32 for the size of the decrypted data in bytes.
A CSSM return value. This function returns CSSM_OK if successful, and returns an error code if an error has occurred.
- CSSM_CSP_INVALID_CONTEXT_HANDLE
Invalid context handle.
- CSSM_CSP_INVALID_DATA_POINTER
Invalid input or output CSSM_DATA pointer.
- CSSM_CSP_INVALID_DATA_COUNT
Invalid input or output data count; data count cannot be 0.
- CSSM_CSP_INVALID_DATA
Invalid input or output CSSM_DATA buffer.
- CSSM_CSP_NOT_ENOUGH_BUFFER
The output buffer is not big enough.
- CSSM_CSP_MEMORY_ERROR
Not enough memory to allocate.
- CSSM_CSP_STAGED_OPERATION_UNSUPPORTED
Staged operation unsupported.
- CSSM_CSP_STAGED_OPERATION_FAILED
Staged Cryptographic operation failed.
- CSSM_CSP_VECTOROFBUFS_UNSUPPORTED
Supports only a single buffer of input.
Comments
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 one 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 de-allocating the memory when it is no longer needed. If the CSSM_DATA_PTR parameter is NULL (that is, does not point to an array of CSSM_DATA structures) or the number of CSSM_DATA structures is specified as zero, the error code CSSM_CSP_INVALID_DATA_POINTER is returned. In-place decryption can be done by supplying the same input and output buffers.
CSSM_DecryptData, CSSM_DecryptDataInit, CSSM_DecryptDataFinal, CSSM_QuerySize
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