splitechconfiglist.sh

#!/bin/bash

# set -x

function splitlist()
{
    # example usage input is base64 encoded ECHconfigList
    # list=$echconfiglist
    # splitlists=`splitelist`
    # result is a space sep list of single-entry base64 encoded ECHConfigLists
    # this assumes encoding is valid and does no error checking
    olist=""
    ah_echlist=`echo $list | base64 -d | xxd -ps -c 200 | tr -d '\n'`
    ah_olen=${ah_echlist:0:4}
    olen=$((16#$ah_olen))
    remaining=$olen
    top=${ah_echlist:4}
    while ((remaining>0))
    do
        ah_nlen=${top:4:4}
        nlen=$((16#$ah_nlen))
        nlen=$((nlen+4))
        ah_nlen=$((nlen*2))
        ah_thislen="`printf  "%04x" $((nlen))`"
        thisone=${top:0:ah_nlen}
        b64thisone=`echo $ah_thislen$thisone | xxd -p -r | base64 -w 0` 
        olist="$olist $b64thisone"
        remaining=$((remaining-nlen))
        top=${top:ah_nlen}
    done
    echo -e "$olist"
}


# example list of 6 ...
list="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"

if [[ "$1" != "" ]]
then
    # assume param is a PEM file
    if [ -f $1 ]
    then
        list=`cat $1 | sed -n '/BEGIN ECHCONFIG/,/END ECHCONFIG/p' | head -n -1 | tail -n -1`
    fi
fi

splitlists=`splitlist` 

for list in $splitlists
do
    echo $list
done