NAME
   SignData,
   CSSM_SignData,
   CSP_SignData   - Sign all buffer data (CDSA)

 SYNOPSIS
   # include <cssm.h>

    API:
        CSSM_RETURN CSSMAPI CSSM_SignData
        (CSSM_CC_HANDLE CCHandle,
        const CSSM_DATA *DataBufs,
        uint32 DataBufCount,
        CSSM_ALGORITHMS DigestAlgorithm,
        CSSM_DATA_PTR Signature)
    SPI:
        CSSM_RETURN CSSMCSPI CSP_SignData
        (CSSM_CSP_HANDLE CSPHandle,
        CSSM_CC_HANDLE CCHandle,
        const CSSM_CONTEXT *Context,
        const CSSM_DATA *DataBufs,
        uint32 DataBufCount,
        CSSM_ALGORITHMS DigestAlgorithm,
        CSSM_DATA_PTR Signature)

 LIBRARY
   Common Security Services Manager library (CDSA$INCSSM300_SHR.EXE)

 API PARAMETERS
   CCHandle (input)
           The handle that describes the context of this cryptographic
           operation used to link to the CSP-managed information.

   DataBufs (input)
           A pointer to a vector of CSSM_DATA structures that contain
           the data to be signed.

   DataBufCount (input)
           The number of DataBufs to be signed.

   DigestAlgorithm (input)
           If signing just a digest, specifies the type of digest.
           In this case, the context should only specify the
           encryption algorithm. If not signing just a digest, it
           must be CSSM_ALGID_NONE. In this case, the context should
           specify the combination digest/encryption algorithm.

   Signature (output)
           A pointer to the CSSM_DATA structure for the signature.

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

   Context (input)
           Pointer to CSSM_CONTEXT structure that describes the
           attributes with this context.

 DESCRIPTION
   This function signs all data contained in the set of input buffers
   using the private key specified in the context. The CSP can require
   that the cryptographic context include access credentials for
   authentication and authorization checks when using a private key or
   a secret key.

   Signing can include digesting the data and encrypting the digest or
   signing just the digest (already calculated by the application). If
   digesting the data and encrypting the digest, then the context should
   specify the combination digest/encryption algorithm (for example,
   CSSM_ALGID_MD5WithRSA). In this case, the DigestAlgorithm parameter
   must be set to CSSM_ALGID_NONE.  If signing just the digest, then the
   context should specify just the encryption algorithm and the
   DigestAlgorithm parameter should specify the type of digest (for
   example, CSSM_ALGID_MD5).  Also, DataBufCount must be 1.

   If the signing algorithm is not reversible or strictly limits the
   size of the signed data, then the algorithm can specify signing
   without digesting.  In this case, the sign operation is performed
   on the input data and the size of the input data is restricted by
   the service provider.

 NOTES ON 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,
   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 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 ON SPI
   The output is returned to the caller as specifed 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.

        CSSMERR_CSP_OUTPUT_LENGTH_ERROR
        CSSMERR_CSP_INVALID_DIGEST_ALGORITHM

 SEE ALSO
   Books

   Intel CDSA Application Developer's Guide (see CDSA)

   Other Help Topics

   Functions for the CSSM API:

       CSSM_VerifyData
       CSSM_SignDataInit
       CSSM_SignDataUpdate
       CSSM_SignDataFinal

   Functions for the CSP SPI:

       CSP_VerifyData
       CSP_SignDataInit
       CSP_SignDataUpdate
       CSP_SignDataFinal