GenerateMac(3)GenerateMac(3)NAME
GenerateMac, CSSM_GenerateMac, CSP_GenerateMac - Compute a message
authentication code (CDSA)
SYNOPSIS
# include <cdsa/cssm.h>
API: CSSM_RETURN CSSMAPI CSSM_GenerateMac (CSSM_CC_HANDLE CCHandle,
const CSSM_DATA *DataBufs, uint32 DataBufCount, CSSM_DATA_PTR Mac) SPI:
CSSM_RETURN CSSMCSPI CSP_GenerateMac (CSSM_CSP_HANDLE CSPHandle,
CSSM_CC_HANDLE CCHandle, const CSSM_CONTEXT *Context, const CSSM_DATA
*DataBufs, uint32 DataBufCount, CSSM_DATA_PTR Mac)
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 operated on. The num‐
ber of DataBufs. A pointer to the CSSM_DATA structure for the Message
Authentication Code.
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. Pointer to CSSM_CONTEXT structure that describes the
attributes with this context.
DESCRIPTION
This function computes a message authentication code for all data con‐
tained in the set of input buffers.
NOTES ON 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, preallocated
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.
NOTES ON 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_OUTPUT_LENGTH_ERROR
SEE ALSO
Books
Intel CDSA Application Developer's Guide (see CDSA_intro(3))
Reference Pages
Functions for the CSSM API:
CSSM_GenerateMacInit(3), CSSM_GenerateMacUpdate(3), CSSM_GenerateMacFi‐
nal(3)
Functions for the CSP SPI:
CSP_GenerateMacInit(3), CSP_GenerateMacUpdate(3), CSP_GenerateMacFi‐
nal(3)GenerateMac(3)