87linux | 15 points | Aug 10 2014 18:22:36

• Requirements: GNU coreutils, openssl, curl, xxd
• Usage: ./mega-dl.sh "FULL_MEGA_URL" "OUTPUT_FILE_NAME"

  #!/bin/bash
  
  if [[ $# != 2 ]]; then 
      echo "usage: mega-dl.sh <url> <output>"
      exit 1
  fi
  
  url="$1"
  enc_file="$2.enc"
  out_file="$2"
  
  id=`echo $url | awk -F '!' '{print $2}'`
  key=`echo $url | awk -F '!' '{print $3}' | sed -e 's/-/+/g' -e 's/_/\//g' -e 's/,//g'`
  b64_hex_key=`echo -n $key | base64 --decode --ignore-garbage 2> /dev/null | xxd -p | tr -d '\n'`
  key[0]=$(( 0x${b64_hex_key:00:16} ^ 0x${b64_hex_key:32:16} ))
  key[1]=$(( 0x${b64_hex_key:16:16} ^ 0x${b64_hex_key:48:16} ))
  key=`printf "%x" ${key[*]}`
  iv="${b64_hex_key:32:16}0000000000000000"
  response=`curl --silent --request POST --data-binary '[{"a":"g","g":1,"p":"'$id'"}]' https://eu.api.mega.co.nz/cs`
  echo "$response"
  new_url=`echo "$response" | awk -F '"' '{print $10}'`
  curl --output "$enc_file" "$new_url"
  openssl enc -d -aes-128-ctr -K $key -iv $iv -in "$enc_file" -out "$out_file"
  rm -f "$enc_file"
  

This would pretty much only be useful if you want to download things without a web browser, but if you're a better bash hacker than me, you might be able to continue an incomplete download. Good luck with that.

EDIT: Fixed to support spaces in the output file name

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