<?xml version="1.0" encoding="UTF-8" ?> <class name="AESContext" inherits="Reference" version="3.5" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd"> <brief_description> Interface to low level AES encryption features. </brief_description> <description> This class provides access to AES encryption/decryption of raw data. Both AES-ECB and AES-CBC mode are supported. [codeblock] extends Node var aes = AESContext.new() func _ready(): var key = "My secret key!!!" # Key must be either 16 or 32 bytes. var data = "My secret text!!" # Data size must be multiple of 16 bytes, apply padding if needed. # Encrypt ECB aes.start(AESContext.MODE_ECB_ENCRYPT, key.to_utf8()) var encrypted = aes.update(data.to_utf8()) aes.finish() # Decrypt ECB aes.start(AESContext.MODE_ECB_DECRYPT, key.to_utf8()) var decrypted = aes.update(encrypted) aes.finish() # Check ECB assert(decrypted == data.to_utf8()) var iv = "My secret iv!!!!" # IV must be of exactly 16 bytes. # Encrypt CBC aes.start(AESContext.MODE_CBC_ENCRYPT, key.to_utf8(), iv.to_utf8()) encrypted = aes.update(data.to_utf8()) aes.finish() # Decrypt CBC aes.start(AESContext.MODE_CBC_DECRYPT, key.to_utf8(), iv.to_utf8()) decrypted = aes.update(encrypted) aes.finish() # Check CBC assert(decrypted == data.to_utf8()) [/codeblock] </description> <tutorials> </tutorials> <methods> <method name="finish"> <return type="void" /> <description> Close this AES context so it can be started again. See [method start]. </description> </method> <method name="get_iv_state"> <return type="PoolByteArray" /> <description> Get the current IV state for this context (IV gets updated when calling [method update]). You normally don't need this function. [b]Note:[/b] This function only makes sense when the context is started with [constant MODE_CBC_ENCRYPT] or [constant MODE_CBC_DECRYPT]. </description> </method> <method name="start"> <return type="int" enum="Error" /> <argument index="0" name="mode" type="int" enum="AESContext.Mode" /> <argument index="1" name="key" type="PoolByteArray" /> <argument index="2" name="iv" type="PoolByteArray" default="PoolByteArray( )" /> <description> Start the AES context in the given [code]mode[/code]. A [code]key[/code] of either 16 or 32 bytes must always be provided, while an [code]iv[/code] (initialization vector) of exactly 16 bytes, is only needed when [code]mode[/code] is either [constant MODE_CBC_ENCRYPT] or [constant MODE_CBC_DECRYPT]. </description> </method> <method name="update"> <return type="PoolByteArray" /> <argument index="0" name="src" type="PoolByteArray" /> <description> Run the desired operation for this AES context. Will return a [PoolByteArray] containing the result of encrypting (or decrypting) the given [code]src[/code]. See [method start] for mode of operation. [b]Note:[/b] The size of [code]src[/code] must be a multiple of 16. Apply some padding if needed. </description> </method> </methods> <constants> <constant name="MODE_ECB_ENCRYPT" value="0" enum="Mode"> AES electronic codebook encryption mode. </constant> <constant name="MODE_ECB_DECRYPT" value="1" enum="Mode"> AES electronic codebook decryption mode. </constant> <constant name="MODE_CBC_ENCRYPT" value="2" enum="Mode"> AES cipher blocker chaining encryption mode. </constant> <constant name="MODE_CBC_DECRYPT" value="3" enum="Mode"> AES cipher blocker chaining decryption mode. </constant> <constant name="MODE_MAX" value="4" enum="Mode"> Maximum value for the mode enum. </constant> </constants> </class>