Move PRNG initialization to namespace level

TunnelKit/Sources/AppExtension/TunnelKitProvider.swift

@@ -205,7 +205,7 @@ open class TunnelKitProvider: NEPacketTunnelProvider {
         log.info("Starting tunnel...")
         cfg.clearLastError(in: appGroup)
         
-        guard OpenVPN.EncryptionBridge.prepareRandomNumberGenerator(seedLength: prngSeedLength) else {
+        guard OpenVPN.prepareRandomNumberGenerator(seedLength: prngSeedLength) else {
             completionHandler(ProviderConfigurationError.prngInitialization)
             return
         }

TunnelKit/Sources/OpenVPN/EncryptionBridge.swift

@@ -39,28 +39,11 @@ import __TunnelKitCore
 import __TunnelKitOpenVPN
 
 extension OpenVPN {
-
-    /// Bridges native encryption for high-level operations.
-    public class EncryptionBridge {
+    class EncryptionBridge {
         private static let maxHmacLength = 100
         
         private let box: CryptoBox
         
-        /**
-         Initializes the PRNG. Must be issued before using `OpenVPNSession`.
-     
-         - Parameter seedLength: The length in bytes of the pseudorandom seed that will feed the PRNG.
-         */
-        public static func prepareRandomNumberGenerator(seedLength: Int) -> Bool {
-            let seed: ZeroingData
-            do {
-                seed = try SecureRandom.safeData(length: seedLength)
-            } catch {
-                return false
-            }
-            return CryptoBox.preparePRNG(withSeed: seed.bytes, length: seed.count)
-        }
-        
         // Ruby: keys_prf
         private static func keysPRF(
             _ label: String,

TunnelKit/Sources/OpenVPN/OpenVPN.swift

@@ -24,7 +24,25 @@
 //
 
 import Foundation
+import __TunnelKitCore
+import __TunnelKitOpenVPN
 
 /// Container for OpenVPN classes.
 public class OpenVPN {
+
+    /**
+     Initializes the PRNG. Must be issued before using `OpenVPNSession`.
+     
+     - Parameter seedLength: The length in bytes of the pseudorandom seed that will feed the PRNG.
+     */
+    public static func prepareRandomNumberGenerator(seedLength: Int) -> Bool {
+        let seed: ZeroingData
+        do {
+            seed = try SecureRandom.safeData(length: seedLength)
+        } catch {
+            return false
+        }
+        return CryptoBox.preparePRNG(withSeed: seed.bytes, length: seed.count)
+    }
+    
 }