Continues a multiple-part digesting operation.

CK_DECLARE_FUNCTION( CK_RV, C_DigestUpdate )( CK_SESSION_HANDLE hSession,
                                              CK_BYTE_PTR pPart,
                                              CK_ULONG ulPartLen )
{
    P11Session_t * pxSession = prvSessionPointerFromHandle( hSession );
    CK_RV xResult = prvCheckValidSessionAndModule( pxSession );
 
    if( pPart == NULL )
    {
        PKCS11_PRINT( ( "ERROR: Null digest mechanism provided. \r\n" ) );
        xResult = CKR_ARGUMENTS_BAD;
    }
 
    if( xResult == CKR_OK )
    {
        if( pxSession->xOperationDigestMechanism != CKM_SHA256 )
        {
            xResult = CKR_OPERATION_NOT_INITIALIZED;
        }
    }
 
    if( xResult == CKR_OK )
    {
        if( 0 != mbedtls_sha256_update_ret( &pxSession->xSHA256Context, pPart, ulPartLen ) )
        {
            xResult = CKR_FUNCTION_FAILED;
            pxSession->xOperationDigestMechanism = pkcs11NO_OPERATION;
        }
    }
 
    if( ( xResult != CKR_OK ) && ( xResult != CKR_SESSION_HANDLE_INVALID ) )
    {
        pxSession->xOperationDigestMechanism = pkcs11NO_OPERATION;
        mbedtls_sha256_free( &pxSession->xSHA256Context );
    }
 
    return xResult;
}

See also: C_DigestInit(), C_DigestFinal()

Note: Digest parameters are shared by a session. Calling C_DigestInit(), C_DigestUpdate(), and C_DigestFinal() with the same session across different tasks may lead to unexpected results.

Parameters

[in]	hSession	Handle of a valid PKCS #11 session.
[in]	pPart	Pointer to the data to be added to the digest.
[in]	ulPartLen	Length of the data located at pPart.

Returns: CKR_OK if successful. Else, see PKCS #11 specification for more information.