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Diffstat (limited to 'doc/classes/AESContext.xml')
| -rw-r--r-- | doc/classes/AESContext.xml | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/doc/classes/AESContext.xml b/doc/classes/AESContext.xml new file mode 100644 index 0000000000..ab4d0e0bc3 --- /dev/null +++ b/doc/classes/AESContext.xml @@ -0,0 +1,99 @@ +<?xml version="1.0" encoding="UTF-8" ?> +<class name="AESContext" inherits="Reference" version="4.0"> + <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"> + </return> + <description> + Close this AES context so it can be started again. See [method start]. + </description> + </method> + <method name="get_iv_state"> + <return type="PackedByteArray"> + </return> + <description> + Get the current IV state for this context (IV gets updated when calling [method update]). You normally don't need this funciton. + Note: 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"> + </return> + <argument index="0" name="mode" type="int" enum="AESContext.Mode"> + </argument> + <argument index="1" name="key" type="PackedByteArray"> + </argument> + <argument index="2" name="iv" type="PackedByteArray" default="PackedByteArray( )"> + </argument> + <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="PackedByteArray"> + </return> + <argument index="0" name="src" type="PackedByteArray"> + </argument> + <description> + Run the desired operation for this AES context. Will return a [PackedByteArray] containing the result of encrypting (or decrypting) the given [code]src[/code]. See [method start] for mode of operation. + Note: 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> |