Use ed25519 instead of RSA for crypto keys

[frlan]

ed25519 is more secure than a 4096 RSA and I suggest to use it e.g. for passkey.pem.

[Half-Shot]

Yeah, probably a good shout. We need to figure out a migration path though since everyone's data will be encoded in a certain way :)

[frlan]

For config.yml I made already a diff:

diff --git a/config.sample.yml b/config.sample.yml
index 7182a9b..67906b1 100644
--- a/config.sample.yml
+++ b/config.sample.yml
@@ -9,7 +9,7 @@ bridge:
   bindAddress: 127.0.0.1
 passFile:
   # A passkey used to encrypt tokens stored inside the bridge.
-  # Run openssl genpkey -out passkey.pem -outform PEM -algorithm RSA -pkeyopt rsa_keygen_bits:4096 to generate
+  # Run openssl genpkey -out passkey.pem -outform PEM -algorithm ed25519
   passkey.pem
 logging:
   # Logging settings. You can have a severity debug,info,warn,error
diff --git a/helm/hookshot/values.yaml b/helm/hookshot/values.yaml
index a4b1302..ab6f74c 100644
--- a/helm/hookshot/values.yaml
+++ b/helm/hookshot/values.yaml
@@ -212,7 +212,7 @@ hookshot:
       # secret: "!secretToken"
     passFile: passkey.pem
     # A passkey used to encrypt tokens stored inside the bridge.
-    # Run openssl genpkey -out passkey.pem -outform PEM -algorithm RSA -pkeyopt rsa_keygen_bits:4096 to generate
+    # Run openssl genpkey -out passkey.pem -outform PEM -algorithm ed25519 to generate
     #
     # bot:
       # (Optional) Define profile information for the bot user
diff --git a/src/config/Config.ts b/src/config/Config.ts
index 374c295..fa0198f 100644
--- a/src/config/Config.ts
+++ b/src/config/Config.ts
@@ -493,7 +493,7 @@ export class BridgeConfig {
     @configKey(`Permissions for using the bridge. See docs/setup.md#permissions for help`, true)
     public readonly permissions: BridgeConfigActorPermission[];
     @configKey(`A passkey used to encrypt tokens stored inside the bridge.
- Run openssl genpkey -out passkey.pem -outform PEM -algorithm RSA -pkeyopt rsa_keygen_bits:4096 to generate`)
+ Run openssl genpkey -out passkey.pem -outform PEM -algorithm ed25519 to generate`)
     public readonly passFile: string;
     @configKey("Configure this to enable GitHub support", true)
     public readonly github?: BridgeConfigGitHub;

which seems to work fine on my testing. But there are way more usages of RSA inside the code.