Document AES and new Crypto/CryptoKey functions.
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Fabio Alessandrelli
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<?xml version="1.0" encoding="UTF-8" ?>
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<class name="AESContext" inherits="Reference" version="4.0">
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<brief_description>
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Interface to low level AES encryption features.
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</brief_description>
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<description>
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This class provides access to AES encryption/decryption of raw data. Both AES-ECB and AES-CBC mode are supported.
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[codeblock]
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extends Node
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var aes = AESContext.new()
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func _ready():
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var key = "My secret key!!!" # Key must be either 16 or 32 bytes.
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var data = "My secret text!!" # Data size must be multiple of 16 bytes, apply padding if needed.
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# Encrypt ECB
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aes.start(AESContext.MODE_ECB_ENCRYPT, key.to_utf8())
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var encrypted = aes.update(data.to_utf8())
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aes.finish()
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# Decrypt ECB
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aes.start(AESContext.MODE_ECB_DECRYPT, key.to_utf8())
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var decrypted = aes.update(encrypted)
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aes.finish()
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# Check ECB
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assert(decrypted == data.to_utf8())
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var iv = "My secret iv!!!!" # IV must be of exactly 16 bytes.
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# Encrypt CBC
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aes.start(AESContext.MODE_CBC_ENCRYPT, key.to_utf8(), iv.to_utf8())
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encrypted = aes.update(data.to_utf8())
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aes.finish()
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# Decrypt CBC
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aes.start(AESContext.MODE_CBC_DECRYPT, key.to_utf8(), iv.to_utf8())
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decrypted = aes.update(encrypted)
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aes.finish()
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# Check CBC
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assert(decrypted == data.to_utf8())
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[/codeblock]
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</description>
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<tutorials>
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</tutorials>
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<methods>
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<method name="finish">
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<return type="void">
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</return>
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<description>
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Close this AES context so it can be started again. See [method start].
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</description>
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</method>
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<method name="get_iv_state">
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<return type="PackedByteArray">
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</return>
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<description>
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Get the current IV state for this context (IV gets updated when calling [method update]). You normally don't need this funciton.
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Note: This function only makes sense when the context is started with [constant MODE_CBC_ENCRYPT] or [constant MODE_CBC_DECRYPT].
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</description>
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</method>
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<method name="start">
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<return type="int" enum="Error">
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</return>
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<argument index="0" name="mode" type="int" enum="AESContext.Mode">
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</argument>
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<argument index="1" name="key" type="PackedByteArray">
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</argument>
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<argument index="2" name="iv" type="PackedByteArray" default="PackedByteArray( )">
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</argument>
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<description>
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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].
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</description>
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</method>
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<method name="update">
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<return type="PackedByteArray">
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</return>
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<argument index="0" name="src" type="PackedByteArray">
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</argument>
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<description>
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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.
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Note: The size of [code]src[/code] must be a multiple of 16. Apply some padding if needed.
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</description>
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</method>
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</methods>
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<constants>
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<constant name="MODE_ECB_ENCRYPT" value="0" enum="Mode">
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AES electronic codebook encryption mode.
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</constant>
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<constant name="MODE_ECB_DECRYPT" value="1" enum="Mode">
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AES electronic codebook decryption mode.
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</constant>
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<constant name="MODE_CBC_ENCRYPT" value="2" enum="Mode">
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AES cipher blocker chaining encryption mode.
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</constant>
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<constant name="MODE_CBC_DECRYPT" value="3" enum="Mode">
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AES cipher blocker chaining decryption mode.
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</constant>
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<constant name="MODE_MAX" value="4" enum="Mode">
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Maximum value for the mode enum.
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</constant>
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</constants>
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</class>
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@ -5,7 +5,7 @@
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</brief_description>
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<description>
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The Crypto class allows you to access some more advanced cryptographic functionalities in Godot.
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For now, this includes generating cryptographically secure random bytes, and RSA keys and self-signed X509 certificates generation. More functionalities are planned for future releases.
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For now, this includes generating cryptographically secure random bytes, RSA keys and self-signed X509 certificates generation, asymmetric key encryption/decryption, and signing/verification.
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[codeblock]
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extends Node
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@ -21,12 +21,48 @@
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# Save key and certificate in the user folder.
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key.save("user://generated.key")
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cert.save("user://generated.crt")
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# Encryption
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var data = "Some data"
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var encrypted = crypto.encrypt(key, data.to_utf8())
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# Decryption
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var decrypted = crypto.decrypt(key, encrypted)
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# Signing
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var signature = crypto.sign(HashingContext.HASH_SHA256, data.sha256_buffer(), key)
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# Verifying
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var verified = crypto.verify(HashingContext.HASH_SHA256, data.sha256_buffer(), signature, key)
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# Checks
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assert(verified)
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assert(data.to_utf8() == decrypted)
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[/codeblock]
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[b]Note:[/b] Not available in HTML5 exports.
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</description>
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<tutorials>
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</tutorials>
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<methods>
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<method name="decrypt">
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<return type="PackedByteArray">
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</return>
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<argument index="0" name="key" type="CryptoKey">
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</argument>
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<argument index="1" name="ciphertext" type="PackedByteArray">
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</argument>
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<description>
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Decrypt the given [code]ciphertext[/code] with the provided private [code]key[/code].
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[b]Note[/b]: The maximum size of accepted ciphertext is limited by the key size.
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</description>
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</method>
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<method name="encrypt">
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<return type="PackedByteArray">
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</return>
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<argument index="0" name="key" type="CryptoKey">
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</argument>
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<argument index="1" name="plaintext" type="PackedByteArray">
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</argument>
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<description>
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Encrypt the given [code]plaintext[/code] with the provided public [code]key[/code].
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[b]Note[/b]: The maximum size of accepted plaintext is limited by the key size.
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</description>
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</method>
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<method name="generate_random_bytes">
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<return type="PackedByteArray">
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</return>
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@ -68,6 +104,34 @@
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[/codeblock]
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</description>
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</method>
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<method name="sign">
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<return type="PackedByteArray">
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</return>
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<argument index="0" name="hash_type" type="int" enum="HashingContext.HashType">
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</argument>
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<argument index="1" name="hash" type="PackedByteArray">
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</argument>
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<argument index="2" name="key" type="CryptoKey">
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</argument>
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<description>
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Sign a given [code]hash[/code] of type [code]hash_type[/code] with the provided private [code]key[/code].
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</description>
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</method>
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<method name="verify">
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<return type="bool">
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</return>
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<argument index="0" name="hash_type" type="int" enum="HashingContext.HashType">
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</argument>
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<argument index="1" name="hash" type="PackedByteArray">
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</argument>
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<argument index="2" name="signature" type="PackedByteArray">
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</argument>
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<argument index="3" name="key" type="CryptoKey">
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</argument>
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<description>
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Verify that a given [code]signature[/code] for [code]hash[/code] of type [code]hash_type[/code] against the provided public [code]key[/code].
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</description>
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</method>
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</methods>
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<constants>
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</constants>
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@ -11,13 +11,34 @@
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<tutorials>
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</tutorials>
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<methods>
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<method name="is_public_only" qualifiers="const">
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<return type="bool">
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</return>
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<description>
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Return [code]true[/code] if this CryptoKey only has the public part, and not the private one.
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</description>
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</method>
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<method name="load">
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<return type="int" enum="Error">
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</return>
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<argument index="0" name="path" type="String">
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</argument>
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<argument index="1" name="public_only" type="bool" default="false">
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</argument>
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<description>
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Loads a key from [code]path[/code] ("*.key" file).
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Loads a key from [code]path[/code]. If [code]public_only[/code] is [code]true[/code], only the public key will be loaded.
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[b]Note[/b]: [code]path[/code] should should be a "*.pub" file if [code]public_only[/code] is [code]true[/code], a "*.key" file otherwise.
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</description>
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</method>
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<method name="load_from_string">
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<return type="int" enum="Error">
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</return>
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<argument index="0" name="string_key" type="String">
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</argument>
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<argument index="1" name="public_only" type="bool" default="false">
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</argument>
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<description>
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Loads a key from the given [code]string[/code]. If [code]public_only[/code] is [code]true[/code], only the public key will be loaded.
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</description>
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</method>
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<method name="save">
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</return>
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<argument index="0" name="path" type="String">
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</argument>
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<argument index="1" name="public_only" type="bool" default="false">
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</argument>
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<description>
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Saves a key to the given [code]path[/code] (should be a "*.key" file).
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Saves a key to the given [code]path[/code]. If [code]public_only[/code] is [code]true[/code], only the public key will be saved.
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[b]Note[/b]: [code]path[/code] should should be a "*.pub" file if [code]public_only[/code] is [code]true[/code], a "*.key" file otherwise.
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</description>
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</method>
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<method name="save_to_string">
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<return type="String">
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</return>
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<argument index="0" name="public_only" type="bool" default="false">
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</argument>
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<description>
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Returns a string containing the key in PEM format. If [code]public_only[/code] is [code]true[/code], only the public key will be included.
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</description>
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</method>
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</methods>
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