Access to advanced cryptographic functionalities. The Crypto class allows you to access some more advanced cryptographic functionalities in Godot. For now, this includes generating cryptographically secure random bytes, RSA keys and self-signed X509 certificates generation, asymmetric key encryption/decryption, and signing/verification. [codeblocks] [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()) # 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() == decrypted) [/gdscript] [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.ToUtf8()); // 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.ToUtf8() == decrypted); } } [/csharp] [/codeblocks] Compares two [PackedByteArray]s for equality without leaking timing information in order to prevent timing attacks. 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. Decrypt the given [param ciphertext] with the provided private [param key]. [b]Note:[/b] The maximum size of accepted ciphertext is limited by the key size. Encrypt the given [param plaintext] with the provided public [param key]. [b]Note:[/b] The maximum size of accepted plaintext is limited by the key size. Generates a [PackedByteArray] of cryptographically secure random bytes with given [param size]. Generates an RSA [CryptoKey] that can be used for creating self-signed certificates and passed to [method StreamPeerTLS.accept_stream]. Generates a self-signed [X509Certificate] from the given [CryptoKey] and [param issuer_name]. The certificate validity will be defined by [param not_before] and [param not_after] (first valid date and last valid date). The [param 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. [codeblocks] [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") [/gdscript] [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"); [/csharp] [/codeblocks] Generates an [url=https://en.wikipedia.org/wiki/HMAC]HMAC[/url] digest of [param msg] using [param key]. The [param hash_type] parameter is the hashing algorithm that is used for the inner and outer hashes. Currently, only [constant HashingContext.HASH_SHA256] and [constant HashingContext.HASH_SHA1] are supported. Sign a given [param hash] of type [param hash_type] with the provided private [param key]. Verify that a given [param signature] for [param hash] of type [param hash_type] against the provided public [param key].