############################################
# function module for SafeWebdrop (client) #
############################################

RAM="/dev/shm/RAM"
REQ="${RAM}/request"
CHALLENGE=""

#----------------------------------------------------#
function safewebdrophash {
     if (( ${#1} > 10 )) ; then
          /usr/bin/echo -n "$1" | /usr/bin/sha256sum | /usr/bin/cut -c-64 
     fi
}

function log {
     if [[ $1 ]] ; then 
          /usr/bin/echo "$(/usr/bin/date +'%x %X'): $1" >> ${RAM}/log
     fi
}

function clean {
     /usr/bin/rm -f ${REQ} ${REQ}.hash  ${REQ}.hash.sig 2> /dev/null
}

function generate_requesthash {

     if [[ -r ${REQ} ]] ; then
          # generate a hash of the request 
          RHASH=$(safewebdrophash "$(/usr/bin/cat ${REQ})")
          /usr/bin/echo -n ${RHASH} > ${REQ}.hash 

          RES=$(/usr/lib/cryptobone/safewebdrop/bin/signRSA "${PASS}" "${REQ}.hash")
          if [[ ${RES} ]]; then
               log "signing: ${RES}"
          fi

          # base64 encode the signed hash
          SIG=""
          if [ -s ${REQ}.hash.sig ] ; then
               SIG=$(/usr/bin/base64 --wrap=0 ${REQ}.hash.sig)
          fi 
     else
          # no valid request
	  exit 3
     fi
}

#----------------------------------------------------#