175 lines
7.9 KiB
XML
175 lines
7.9 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="Crypto" inherits="RefCounted" version="4.0">
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<brief_description>
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Access to advanced cryptographic functionalities.
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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, RSA keys and self-signed X509 certificates generation, asymmetric key encryption/decryption, and signing/verification.
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[codeblocks]
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[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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[/gdscript]
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[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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[/csharp]
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[/codeblocks]
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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="constant_time_compare">
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<return type="bool" />
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<argument index="0" name="trusted" type="PackedByteArray" />
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<argument index="1" name="received" type="PackedByteArray" />
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<description>
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Compares two [PackedByteArray]s for equality without leaking timing information in order to prevent timing attacks.
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See [url=https://paragonie.com/blog/2015/11/preventing-timing-attacks-on-string-comparison-with-double-hmac-strategy]this blog post[/url] for more information.
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</description>
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</method>
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<method name="decrypt">
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<return type="PackedByteArray" />
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<argument index="0" name="key" type="CryptoKey" />
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<argument index="1" name="ciphertext" type="PackedByteArray" />
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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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<argument index="0" name="key" type="CryptoKey" />
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<argument index="1" name="plaintext" type="PackedByteArray" />
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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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<argument index="0" name="size" type="int" />
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<description>
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Generates a [PackedByteArray] of cryptographically secure random bytes with given [code]size[/code].
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</description>
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</method>
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<method name="generate_rsa">
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<return type="CryptoKey" />
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<argument index="0" name="size" type="int" />
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<description>
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Generates an RSA [CryptoKey] that can be used for creating self-signed certificates and passed to [method StreamPeerSSL.accept_stream].
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</description>
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</method>
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<method name="generate_self_signed_certificate">
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<return type="X509Certificate" />
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<argument index="0" name="key" type="CryptoKey" />
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<argument index="1" name="issuer_name" type="String" default=""CN=myserver,O=myorganisation,C=IT"" />
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<argument index="2" name="not_before" type="String" default=""20140101000000"" />
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<argument index="3" name="not_after" type="String" default=""20340101000000"" />
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<description>
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Generates a self-signed [X509Certificate] from the given [CryptoKey] and [code]issuer_name[/code]. The certificate validity will be defined by [code]not_before[/code] and [code]not_after[/code] (first valid date and last valid date). The [code]issuer_name[/code] 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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[codeblocks]
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[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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[/gdscript]
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[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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[/csharp]
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[/codeblocks]
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</description>
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</method>
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<method name="hmac_digest">
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<return type="PackedByteArray" />
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<argument index="0" name="hash_type" type="int" enum="HashingContext.HashType" />
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<argument index="1" name="key" type="PackedByteArray" />
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<argument index="2" name="msg" type="PackedByteArray" />
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<description>
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Generates an [url=https://en.wikipedia.org/wiki/HMAC]HMAC[/url] digest of [code]msg[/code] using [code]key[/code]. The [code]hash_type[/code] parameter is the hashing algorithm that is used for the inner and outer hashes.
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Currently, only [constant HashingContext.HASH_SHA256] and [constant HashingContext.HASH_SHA1] are supported.
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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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<argument index="0" name="hash_type" type="int" enum="HashingContext.HashType" />
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<argument index="1" name="hash" type="PackedByteArray" />
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<argument index="2" name="key" type="CryptoKey" />
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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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<argument index="0" name="hash_type" type="int" enum="HashingContext.HashType" />
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<argument index="1" name="hash" type="PackedByteArray" />
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<argument index="2" name="signature" type="PackedByteArray" />
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<argument index="3" name="key" type="CryptoKey" />
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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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</class>
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