Audio Encryption Script

[InfiniteSpawn]

Audio Encryption Script
InfiniteSpawn
May 9 2007

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Finally after months of searching, I have found an audio encryption script. Obviously, what it does is encrypts your audio music. To use, create a file named audio.edat and place it directly in the game folder (not in any sub-folder). Then all you have to do is copy the script and place it above main. I take no credit for this script...It was made by BEHEMOTH, not me. The music will encrypt after it has played been played in the game.

Here's the script:

Audio-Encryption Script

Code:

#############################################################################
# Script by: BEHEMOTH # #
####################### #
#Version: 1.0 #
#Date Created: October 26th 2006 8:42 PM (Eastern Standard Time) #
#Description: An encryption script for audio files. #
#Thanks goes to thephantom from http://www.phanxgames.com/ for pointing out #
#the whole encryption key idea which I was too blind to see. #
#############################################################################

#############################################################################
# ***IMPORTANT RESTRICTIONS*** #
#1) If the audio file is an .mp3 file, it will NOT encrypt the file and it #
#will play it normally. If you wish to have your mp3 file encrypted please #
#save it as another compatible audio file, such as .ogg, .mid #
#or .wav(compressed of course) or .wma #
# #
#2) Your audio files must NOT be: read only, or hidden, or protected in #
#anyway or it will not encrypt the file and it will play it normally. #
# #
#3) Audio files should not have the same filename with a different #
# extension. #
# BAD: "battle01.mid" "battle01.ogg" #
# GOOD: "battle01.mid" "battle02.ogg" #
# #
#4) Files from an RMXP RTP will not be encrypted and will play normally. #
#############################################################################

#############################################################################
# ***NOTES*** #
#Positives: #
# - Protects your own custom audio files #
# - Gives a point to having a BGM test inside your game #
# - Ummmm.......it's cool #
# #
#Negatives: #
# - Audio files take slightly longer to load #
# - mp3 files do not encrypt #
# - Once encrypted, audio files will not play in rmxp gui, only in the game #
# - The audio file is slightly bigger in file size then the orginal file #
# #
#If you have problems, suggestions, comments about this script then you can #
#currently find me here: http://www.phanxgames.com/forum/ #
# #
#How to Use: #
#To encrypt your audio files play the file in your game at least once. #
#The script will handle the rest. MAKE SURE TO BACK UP YOUR ORIGINAL #
#AUDIO FILES BEFORE ENCRYPTING IT, because it automatically overwrites #
#the original file with the encrypted file. To make this script encrypt #
#only certain audio files such as BGM, BGS, ME, SE then change the values #
#of the variables below named: #
#ENCRYPT_BGM, ENCRYPT_BGS, ENCRYPT_ME, ENCRYPT_SE #
# (located below class Game_System) #
#changing the value to true means those files will be encrypted and false #
#means those files will not be encrypted. Changing these values when an #
#audio file is encrypted may cause undesired results. So choose what you #
#want first then start encrypting your audio files. Deleting the Encryption #
#key file (default = "audio.edat") after encrypting your audio will also #
#result in undesired results....so don't delete or move that file once #
#you've been encrypting or else you'll have to start encrypting all your #
#audio again. This script is more for people who create their own audio #
#files. #
#############################################################################

class Game_System
ENCRYPT_EXT = ".eaudio" #Encrypted file extenstion
ENCRYPT_FILE = "audio.edat" #File containing encrypted data
ENCRYPT_KEY_LENGTH = 16 #Number of characters for encryption key

#Change encryption for certain audio files.......HERE!!!!!
ENCRYPT_BGM = true #Encrypt bgm?
ENCRYPT_BGS = false #Encrypt bgs?
ENCRYPT_ME = false #Encrypt me? Yes, please! lol
ENCRYPT_SE = false #Encrypt se?

#--------------------------------------------------------------------------
# * Play Background Music
# bgm : background music to be played
#--------------------------------------------------------------------------
def bgm_play(bgm)
@playing_bgm = bgm
if bgm != nil and bgm.name != ""
filename = "Audio/BGM/" + bgm.name
if ENCRYPT_BGM
decrypt_file(filename)
Audio.bgm_play(filename, bgm.volume, bgm.pitch)
encrypt_file(filename)
else
Audio.bgm_play(filename, bgm.volume, bgm.pitch)
end
else
Audio.bgm_stop
end
Graphics.frame_reset
end
#--------------------------------------------------------------------------
# * Play Background Sound
# bgs : background sound to be played
#--------------------------------------------------------------------------
def bgs_play(bgs)
@playing_bgs = bgs
if bgs != nil and bgs.name != ""
filename = "Audio/BGS/" + bgs.name
if ENCRYPT_BGS
decrypt_file(filename)
Audio.bgs_play(filename, bgs.volume, bgs.pitch)
encrypt_file(filename)
else
Audio.bgs_play(filename, bgs.volume, bgs.pitch)
end
else
Audio.bgs_stop
end
Graphics.frame_reset
end
#--------------------------------------------------------------------------
# * Play Music Effect
# me : music effect to be played
#--------------------------------------------------------------------------
def me_play(me)
if me != nil and me.name != ""
filename = "Audio/ME/" + me.name
if ENCRYPT_ME
decrypt_file(filename)
Audio.me_play(filename, me.volume, me.pitch)
encrypt_file(filename)
else
Audio.me_play(filename, me.volume, me.pitch)
end
else
Audio.me_stop
end
Graphics.frame_reset
end
#--------------------------------------------------------------------------
# * Play Sound Effect
# se : sound effect to be played
#--------------------------------------------------------------------------
def se_play(se)
if se != nil and se.name != ""
filename = "Audio/SE/" + se.name
if ENCRYPT_SE
decrypt_file(filename)
Audio.se_play(filename, se.volume, se.pitch)
encrypt_file(filename)
else
Audio.se_play(filename, se.volume, se.pitch)
end
end
end
#--------------------------------------------------------------------------
# Finds the extension of an audio filename with no extension
#--------------------------------------------------------------------------
def get_file_ext(filename)
if FileTest.exist?(filename + ".wav")
return ".wav"
elsif FileTest.exist?(filename + ".mp3")
return ".mp3"
elsif FileTest.exist?(filename + ".ogg")
return ".ogg"
elsif FileTest.exist?(filename + ".mid")
return ".mid"
elsif FileTest.exist?(filename + ".wma")
return ".wma"
else
return ENCRYPT_EXT
end
end
#--------------------------------------------------------------------------
# Encrypts an audio file and saves it with the encrypted extension and
# deletes the non encrypted file if it was not already encrypted.
#--------------------------------------------------------------------------
def encrypt_file(filename)
ext = get_file_ext(filename)
filen = filename + ext
# If file doesn't not exist in project/audio folder then exit.
# File either doesn't exist or is part of the RTP.
if (not FileTest.exist?(filen))
return
end
# Load File
afile = File.open(filen, "rb")
t = afile.readlines
afile.close
#If filename was not previously encrypted
if ext != ENCRYPT_EXT
begin
# Test if file is writeable
afile = File.open(filen, "wb")
afile.close
# Delete File
File.delete(filen)
rescue
#File could not be encrypted
return
end
end
get_encryption
# Save File
filen = filename + ENCRYPT_EXT
afile = File.open(filen, "wb")
for i in 0...t.size
s = @encrypt_data + t[i]
t[i] = s
end
Marshal.dump(t, afile)
afile.close
end
#--------------------------------------------------------------------------
# Decrypts a file if it is encrypted.
#--------------------------------------------------------------------------
def decrypt_file(filename)
filename += ENCRYPT_EXT
#If file is not encrypted
if (not FileTest.exist?(filename))
return
end
get_encryption
# Load File
afile = File.open(filename, "rb")
t = Marshal.load(afile)
for i in 0...t.size
s = t[i]
t[i] = s[ENCRYPT_KEY_LENGTH, t[i].size]
end
afile.close
# Save File
afile = File.open(filename, "wb")
for i in 0...t.size
afile.write(t[i])
end
afile.close
end
#--------------------------------------------------------------------------
# * Retrieve's encryption data from file. If file doesn't exist then it
# creates an encryption data file.
#--------------------------------------------------------------------------
def get_encryption
# No encryption data(method) found
if @encrypt_data == nil
# Encryption data file exists?
if FileTest.exist?(ENCRYPT_FILE)
# Load Data File
afile = File.open(ENCRYPT_FILE, "rb")
@encrypt_data = Marshal.load(afile)
afile.close
else
# Create encryption data file
afile = File.open(ENCRYPT_FILE, "wb")
Marshal.dump(create_key, afile)
afile.close
end
end
end
#--------------------------------------------------------------------------
# * Returns ENCRYPT_KEY_LENGTH character randomized string used to encrypt
# the audio file
#--------------------------------------------------------------------------
def create_key
key = ""
for i in 0...ENCRYPT_KEY_LENGTH
key_num = rand(36)
key_char = key_num.to_s(36)
upper_case = rand(2) == 1
if key_num > 9 && upper_case
key_char.upcase!
end
key += key_char
end
return key
end
#--------------------------------------------------------------------------
end

Note:
This will not encrypt MP3 files. You must change it to either OGG, WAV, or WMA.
Once the music files are encrypted, you will no longer hear them while you are creating your project.
You can only hear them when you actually test or play the game.
Back-up your music files before using this script. Once their encrypted, their encrypted for good!

I found a free audio-converter you can use called Audacity. With Audacity, not only can you convert them, but you can edit the music as well.

Basically, look at the music before you start the game and you will see it's not encrypted. Then, look at the music after the game is played and you will see that all the music is now encrypted!