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225 lines
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ReStructuredText
225 lines
16 KiB
ReStructuredText
:github_url: hide
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.. Generated automatically by doc/tools/make_rst.py in Godot's source tree.
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.. DO NOT EDIT THIS FILE, but the Crypto.xml source instead.
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.. The source is found in doc/classes or modules/<name>/doc_classes.
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.. _class_Crypto:
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Crypto
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======
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**Inherits:** :ref:`RefCounted<class_RefCounted>` **<** :ref:`Object<class_Object>`
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Access to advanced cryptographic functionalities.
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Description
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-----------
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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, RSA keys and self-signed X509 certificates generation, asymmetric key encryption/decryption, and signing/verification.
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.. tabs::
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.. code-tab:: gdscript
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extends Node
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var crypto = Crypto.new()
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var key = CryptoKey.new()
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var cert = X509Certificate.new()
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func _ready():
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# Generate new RSA key.
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key = crypto.generate_rsa(4096)
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# Generate new self-signed certificate with the given key.
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cert = crypto.generate_self_signed_certificate(key, "CN=mydomain.com,O=My Game Company,C=IT")
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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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.. code-tab:: csharp
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using Godot;
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using System;
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using System.Diagnostics;
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public class CryptoNode : Node
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{
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public Crypto Crypto = new Crypto();
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public CryptoKey Key = new CryptoKey();
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public X509Certificate Cert = new X509Certificate();
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public override void _Ready()
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{
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// Generate new RSA key.
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Key = Crypto.GenerateRsa(4096);
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// Generate new self-signed certificate with the given key.
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Cert = Crypto.GenerateSelfSignedCertificate(Key, "CN=mydomain.com,O=My Game Company,C=IT");
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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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string data = "Some data";
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byte[] encrypted = Crypto.Encrypt(Key, data.ToUTF8());
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// Decryption
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byte[] decrypted = Crypto.Decrypt(Key, encrypted);
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// Signing
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byte[] signature = Crypto.Sign(HashingContext.HashType.Sha256, Data.SHA256Buffer(), Key);
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// Verifying
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bool verified = Crypto.Verify(HashingContext.HashType.Sha256, Data.SHA256Buffer(), signature, Key);
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// Checks
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Debug.Assert(verified);
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Debug.Assert(data.ToUTF8() == decrypted);
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}
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}
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\ **Note:** Not available in HTML5 exports.
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Methods
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-------
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+-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`bool<class_bool>` | :ref:`constant_time_compare<class_Crypto_method_constant_time_compare>` **(** :ref:`PackedByteArray<class_PackedByteArray>` trusted, :ref:`PackedByteArray<class_PackedByteArray>` received **)** |
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+-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`PackedByteArray<class_PackedByteArray>` | :ref:`decrypt<class_Crypto_method_decrypt>` **(** :ref:`CryptoKey<class_CryptoKey>` key, :ref:`PackedByteArray<class_PackedByteArray>` ciphertext **)** |
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+-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`PackedByteArray<class_PackedByteArray>` | :ref:`encrypt<class_Crypto_method_encrypt>` **(** :ref:`CryptoKey<class_CryptoKey>` key, :ref:`PackedByteArray<class_PackedByteArray>` plaintext **)** |
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+-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`PackedByteArray<class_PackedByteArray>` | :ref:`generate_random_bytes<class_Crypto_method_generate_random_bytes>` **(** :ref:`int<class_int>` size **)** |
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+-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`CryptoKey<class_CryptoKey>` | :ref:`generate_rsa<class_Crypto_method_generate_rsa>` **(** :ref:`int<class_int>` size **)** |
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+-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`X509Certificate<class_X509Certificate>` | :ref:`generate_self_signed_certificate<class_Crypto_method_generate_self_signed_certificate>` **(** :ref:`CryptoKey<class_CryptoKey>` key, :ref:`String<class_String>` issuer_name="CN=myserver,O=myorganisation,C=IT", :ref:`String<class_String>` not_before="20140101000000", :ref:`String<class_String>` not_after="20340101000000" **)** |
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+-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`PackedByteArray<class_PackedByteArray>` | :ref:`hmac_digest<class_Crypto_method_hmac_digest>` **(** :ref:`HashType<enum_HashingContext_HashType>` hash_type, :ref:`PackedByteArray<class_PackedByteArray>` key, :ref:`PackedByteArray<class_PackedByteArray>` msg **)** |
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+-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`PackedByteArray<class_PackedByteArray>` | :ref:`sign<class_Crypto_method_sign>` **(** :ref:`HashType<enum_HashingContext_HashType>` hash_type, :ref:`PackedByteArray<class_PackedByteArray>` hash, :ref:`CryptoKey<class_CryptoKey>` key **)** |
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+-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`bool<class_bool>` | :ref:`verify<class_Crypto_method_verify>` **(** :ref:`HashType<enum_HashingContext_HashType>` hash_type, :ref:`PackedByteArray<class_PackedByteArray>` hash, :ref:`PackedByteArray<class_PackedByteArray>` signature, :ref:`CryptoKey<class_CryptoKey>` key **)** |
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+-----------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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Method Descriptions
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-------------------
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.. _class_Crypto_method_constant_time_compare:
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- :ref:`bool<class_bool>` **constant_time_compare** **(** :ref:`PackedByteArray<class_PackedByteArray>` trusted, :ref:`PackedByteArray<class_PackedByteArray>` received **)**
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Compares two :ref:`PackedByteArray<class_PackedByteArray>`\ s for equality without leaking timing information in order to prevent timing attacks.
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See `this blog post <https://paragonie.com/blog/2015/11/preventing-timing-attacks-on-string-comparison-with-double-hmac-strategy>`__ for more information.
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----
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.. _class_Crypto_method_decrypt:
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- :ref:`PackedByteArray<class_PackedByteArray>` **decrypt** **(** :ref:`CryptoKey<class_CryptoKey>` key, :ref:`PackedByteArray<class_PackedByteArray>` ciphertext **)**
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Decrypt the given ``ciphertext`` with the provided private ``key``.
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\ **Note:** The maximum size of accepted ciphertext is limited by the key size.
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----
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.. _class_Crypto_method_encrypt:
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- :ref:`PackedByteArray<class_PackedByteArray>` **encrypt** **(** :ref:`CryptoKey<class_CryptoKey>` key, :ref:`PackedByteArray<class_PackedByteArray>` plaintext **)**
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Encrypt the given ``plaintext`` with the provided public ``key``.
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\ **Note:** The maximum size of accepted plaintext is limited by the key size.
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----
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.. _class_Crypto_method_generate_random_bytes:
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- :ref:`PackedByteArray<class_PackedByteArray>` **generate_random_bytes** **(** :ref:`int<class_int>` size **)**
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Generates a :ref:`PackedByteArray<class_PackedByteArray>` of cryptographically secure random bytes with given ``size``.
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----
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.. _class_Crypto_method_generate_rsa:
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- :ref:`CryptoKey<class_CryptoKey>` **generate_rsa** **(** :ref:`int<class_int>` size **)**
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Generates an RSA :ref:`CryptoKey<class_CryptoKey>` that can be used for creating self-signed certificates and passed to :ref:`StreamPeerSSL.accept_stream<class_StreamPeerSSL_method_accept_stream>`.
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----
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.. _class_Crypto_method_generate_self_signed_certificate:
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- :ref:`X509Certificate<class_X509Certificate>` **generate_self_signed_certificate** **(** :ref:`CryptoKey<class_CryptoKey>` key, :ref:`String<class_String>` issuer_name="CN=myserver,O=myorganisation,C=IT", :ref:`String<class_String>` not_before="20140101000000", :ref:`String<class_String>` not_after="20340101000000" **)**
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Generates a self-signed :ref:`X509Certificate<class_X509Certificate>` from the given :ref:`CryptoKey<class_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).
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A small example to generate an RSA key and a X509 self-signed certificate.
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.. tabs::
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.. code-tab:: gdscript
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var crypto = Crypto.new()
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# Generate 4096 bits RSA key.
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var key = crypto.generate_rsa(4096)
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# Generate self-signed certificate using the given key.
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var cert = crypto.generate_self_signed_certificate(key, "CN=example.com,O=A Game Company,C=IT")
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.. code-tab:: csharp
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var crypto = new Crypto();
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// Generate 4096 bits RSA key.
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CryptoKey key = crypto.GenerateRsa(4096);
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// Generate self-signed certificate using the given key.
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X509Certificate cert = crypto.GenerateSelfSignedCertificate(key, "CN=mydomain.com,O=My Game Company,C=IT");
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----
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.. _class_Crypto_method_hmac_digest:
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- :ref:`PackedByteArray<class_PackedByteArray>` **hmac_digest** **(** :ref:`HashType<enum_HashingContext_HashType>` hash_type, :ref:`PackedByteArray<class_PackedByteArray>` key, :ref:`PackedByteArray<class_PackedByteArray>` msg **)**
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Generates an `HMAC <https://en.wikipedia.org/wiki/HMAC>`__ digest of ``msg`` using ``key``. The ``hash_type`` parameter is the hashing algorithm that is used for the inner and outer hashes.
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Currently, only :ref:`HashingContext.HASH_SHA256<class_HashingContext_constant_HASH_SHA256>` and :ref:`HashingContext.HASH_SHA1<class_HashingContext_constant_HASH_SHA1>` are supported.
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----
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.. _class_Crypto_method_sign:
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- :ref:`PackedByteArray<class_PackedByteArray>` **sign** **(** :ref:`HashType<enum_HashingContext_HashType>` hash_type, :ref:`PackedByteArray<class_PackedByteArray>` hash, :ref:`CryptoKey<class_CryptoKey>` key **)**
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Sign a given ``hash`` of type ``hash_type`` with the provided private ``key``.
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----
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.. _class_Crypto_method_verify:
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- :ref:`bool<class_bool>` **verify** **(** :ref:`HashType<enum_HashingContext_HashType>` hash_type, :ref:`PackedByteArray<class_PackedByteArray>` hash, :ref:`PackedByteArray<class_PackedByteArray>` signature, :ref:`CryptoKey<class_CryptoKey>` key **)**
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Verify that a given ``signature`` for ``hash`` of type ``hash_type`` against the provided public ``key``.
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.. |virtual| replace:: :abbr:`virtual (This method should typically be overridden by the user to have any effect.)`
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.. |const| replace:: :abbr:`const (This method has no side effects. It doesn't modify any of the instance's member variables.)`
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.. |vararg| replace:: :abbr:`vararg (This method accepts any number of arguments after the ones described here.)`
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.. |constructor| replace:: :abbr:`constructor (This method is used to construct a type.)`
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.. |static| replace:: :abbr:`static (This method doesn't need an instance to be called, so it can be called directly using the class name.)`
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.. |operator| replace:: :abbr:`operator (This method describes a valid operator to use with this type as left-hand operand.)`
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