Provides access to advanced cryptographic functionalities. 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 [X509Certificate]s. [codeblocks] [gdscript] var crypto = Crypto.new() # Generate new RSA key. var key = crypto.generate_rsa(4096) # Generate new self-signed certificate with the given key. var 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) [/gdscript] [csharp] using Godot; using System.Diagnostics; Crypto crypto = new Crypto(); // Generate new RSA key. CryptoKey key = crypto.GenerateRsa(4096); // Generate new self-signed certificate with the given key. X509Certificate 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); [/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 an 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].