:github_url: hide .. DO NOT EDIT THIS FILE!!! .. Generated automatically from Godot engine sources. .. Generator: https://github.com/godotengine/godot/tree/4.1/doc/tools/make_rst.py. .. XML source: https://github.com/godotengine/godot/tree/4.1/doc/classes/Crypto.xml. .. _class_Crypto: Crypto ====== **Inherits:** :ref:`RefCounted` **<** :ref:`Object` Provides access to advanced cryptographic functionalities. .. rst-class:: classref-introduction-group Description ----------- The Crypto class provides access to advanced cryptographic functionalities. Currently, this includes asymmetric key encryption/decryption, signing/verification, and generating cryptographically secure random bytes, RSA keys, HMAC digests, and self-signed :ref:`X509Certificate`\ s. .. tabs:: .. code-tab:: gdscript extends Node var crypto = Crypto.new() var key = CryptoKey.new() var cert = X509Certificate.new() func _ready(): # Generate new RSA key. key = crypto.generate_rsa(4096) # Generate new self-signed certificate with the given key. cert = crypto.generate_self_signed_certificate(key, "CN=mydomain.com,O=My Game Company,C=IT") # Save key and certificate in the user folder. key.save("user://generated.key") cert.save("user://generated.crt") # Encryption var data = "Some data" var encrypted = crypto.encrypt(key, data.to_utf8_buffer()) # Decryption var decrypted = crypto.decrypt(key, encrypted) # Signing var signature = crypto.sign(HashingContext.HASH_SHA256, data.sha256_buffer(), key) # Verifying var verified = crypto.verify(HashingContext.HASH_SHA256, data.sha256_buffer(), signature, key) # Checks assert(verified) assert(data.to_utf8_buffer() == decrypted) .. code-tab:: csharp using Godot; using System.Diagnostics; public partial class MyNode : Node { private Crypto _crypto = new Crypto(); private CryptoKey _key = new CryptoKey(); private X509Certificate _cert = new X509Certificate(); public override void _Ready() { // Generate new RSA key. _key = _crypto.GenerateRsa(4096); // Generate new self-signed certificate with the given key. _cert = _crypto.GenerateSelfSignedCertificate(_key, "CN=mydomain.com,O=My Game Company,C=IT"); // Save key and certificate in the user folder. _key.Save("user://generated.key"); _cert.Save("user://generated.crt"); // Encryption string data = "Some data"; byte[] encrypted = _crypto.Encrypt(_key, data.ToUtf8Buffer()); // Decryption byte[] decrypted = _crypto.Decrypt(_key, encrypted); // Signing byte[] signature = _crypto.Sign(HashingContext.HashType.Sha256, Data.Sha256Buffer(), _key); // Verifying bool verified = _crypto.Verify(HashingContext.HashType.Sha256, Data.Sha256Buffer(), signature, _key); // Checks Debug.Assert(verified); Debug.Assert(data.ToUtf8Buffer() == decrypted); } } .. rst-class:: classref-reftable-group Methods ------- .. table:: :widths: auto +-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | :ref:`bool` | :ref:`constant_time_compare` **(** :ref:`PackedByteArray` trusted, :ref:`PackedByteArray` received **)** | +-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | :ref:`PackedByteArray` | :ref:`decrypt` **(** :ref:`CryptoKey` key, :ref:`PackedByteArray` ciphertext **)** | +-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | :ref:`PackedByteArray` | :ref:`encrypt` **(** :ref:`CryptoKey` key, :ref:`PackedByteArray` plaintext **)** | +-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | :ref:`PackedByteArray` | :ref:`generate_random_bytes` **(** :ref:`int` size **)** | +-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | :ref:`CryptoKey` | :ref:`generate_rsa` **(** :ref:`int` size **)** | +-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | :ref:`X509Certificate` | :ref:`generate_self_signed_certificate` **(** :ref:`CryptoKey` key, :ref:`String` issuer_name="CN=myserver,O=myorganisation,C=IT", :ref:`String` not_before="20140101000000", :ref:`String` not_after="20340101000000" **)** | +-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | :ref:`PackedByteArray` | :ref:`hmac_digest` **(** :ref:`HashType` hash_type, :ref:`PackedByteArray` key, :ref:`PackedByteArray` msg **)** | +-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | :ref:`PackedByteArray` | :ref:`sign` **(** :ref:`HashType` hash_type, :ref:`PackedByteArray` hash, :ref:`CryptoKey` key **)** | +-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | :ref:`bool` | :ref:`verify` **(** :ref:`HashType` hash_type, :ref:`PackedByteArray` hash, :ref:`PackedByteArray` signature, :ref:`CryptoKey` key **)** | +-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ .. rst-class:: classref-section-separator ---- .. rst-class:: classref-descriptions-group Method Descriptions ------------------- .. _class_Crypto_method_constant_time_compare: .. rst-class:: classref-method :ref:`bool` **constant_time_compare** **(** :ref:`PackedByteArray` trusted, :ref:`PackedByteArray` received **)** Compares two :ref:`PackedByteArray`\ s for equality without leaking timing information in order to prevent timing attacks. See `this blog post `__ for more information. .. rst-class:: classref-item-separator ---- .. _class_Crypto_method_decrypt: .. rst-class:: classref-method :ref:`PackedByteArray` **decrypt** **(** :ref:`CryptoKey` key, :ref:`PackedByteArray` ciphertext **)** Decrypt the given ``ciphertext`` with the provided private ``key``. \ **Note:** The maximum size of accepted ciphertext is limited by the key size. .. rst-class:: classref-item-separator ---- .. _class_Crypto_method_encrypt: .. rst-class:: classref-method :ref:`PackedByteArray` **encrypt** **(** :ref:`CryptoKey` key, :ref:`PackedByteArray` plaintext **)** Encrypt the given ``plaintext`` with the provided public ``key``. \ **Note:** The maximum size of accepted plaintext is limited by the key size. .. rst-class:: classref-item-separator ---- .. _class_Crypto_method_generate_random_bytes: .. rst-class:: classref-method :ref:`PackedByteArray` **generate_random_bytes** **(** :ref:`int` size **)** Generates a :ref:`PackedByteArray` of cryptographically secure random bytes with given ``size``. .. rst-class:: classref-item-separator ---- .. _class_Crypto_method_generate_rsa: .. rst-class:: classref-method :ref:`CryptoKey` **generate_rsa** **(** :ref:`int` size **)** Generates an RSA :ref:`CryptoKey` that can be used for creating self-signed certificates and passed to :ref:`StreamPeerTLS.accept_stream`. .. rst-class:: classref-item-separator ---- .. _class_Crypto_method_generate_self_signed_certificate: .. rst-class:: classref-method :ref:`X509Certificate` **generate_self_signed_certificate** **(** :ref:`CryptoKey` key, :ref:`String` issuer_name="CN=myserver,O=myorganisation,C=IT", :ref:`String` not_before="20140101000000", :ref:`String` not_after="20340101000000" **)** Generates a self-signed :ref:`X509Certificate` from the given :ref:`CryptoKey` and ``issuer_name``. The certificate validity will be defined by ``not_before`` and ``not_after`` (first valid date and last valid date). The ``issuer_name`` must contain at least "CN=" (common name, i.e. the domain name), "O=" (organization, i.e. your company name), "C=" (country, i.e. 2 lettered ISO-3166 code of the country the organization is based in). A small example to generate an RSA key and a X509 self-signed certificate. .. tabs:: .. code-tab:: gdscript var crypto = Crypto.new() # Generate 4096 bits RSA key. var key = crypto.generate_rsa(4096) # Generate self-signed certificate using the given key. var cert = crypto.generate_self_signed_certificate(key, "CN=example.com,O=A Game Company,C=IT") .. code-tab:: csharp var crypto = new Crypto(); // Generate 4096 bits RSA key. CryptoKey key = crypto.GenerateRsa(4096); // Generate self-signed certificate using the given key. X509Certificate cert = crypto.GenerateSelfSignedCertificate(key, "CN=mydomain.com,O=My Game Company,C=IT"); .. rst-class:: classref-item-separator ---- .. _class_Crypto_method_hmac_digest: .. rst-class:: classref-method :ref:`PackedByteArray` **hmac_digest** **(** :ref:`HashType` hash_type, :ref:`PackedByteArray` key, :ref:`PackedByteArray` msg **)** Generates an `HMAC `__ digest of ``msg`` using ``key``. The ``hash_type`` parameter is the hashing algorithm that is used for the inner and outer hashes. Currently, only :ref:`HashingContext.HASH_SHA256` and :ref:`HashingContext.HASH_SHA1` are supported. .. rst-class:: classref-item-separator ---- .. _class_Crypto_method_sign: .. rst-class:: classref-method :ref:`PackedByteArray` **sign** **(** :ref:`HashType` hash_type, :ref:`PackedByteArray` hash, :ref:`CryptoKey` key **)** Sign a given ``hash`` of type ``hash_type`` with the provided private ``key``. .. rst-class:: classref-item-separator ---- .. _class_Crypto_method_verify: .. rst-class:: classref-method :ref:`bool` **verify** **(** :ref:`HashType` hash_type, :ref:`PackedByteArray` hash, :ref:`PackedByteArray` signature, :ref:`CryptoKey` key **)** Verify that a given ``signature`` for ``hash`` of type ``hash_type`` against the provided public ``key``. .. |virtual| replace:: :abbr:`virtual (This method should typically be overridden by the user to have any effect.)` .. |const| replace:: :abbr:`const (This method has no side effects. It doesn't modify any of the instance's member variables.)` .. |vararg| replace:: :abbr:`vararg (This method accepts any number of arguments after the ones described here.)` .. |constructor| replace:: :abbr:`constructor (This method is used to construct a type.)` .. |static| replace:: :abbr:`static (This method doesn't need an instance to be called, so it can be called directly using the class name.)` .. |operator| replace:: :abbr:`operator (This method describes a valid operator to use with this type as left-hand operand.)` .. |bitfield| replace:: :abbr:`BitField (This value is an integer composed as a bitmask of the following flags.)`