diff --git a/Sources/WebAuthn/Helpers/ChallengeGenerator.swift b/Sources/WebAuthn/Helpers/ChallengeGenerator.swift
index ecbaa69..61aa13e 100644
--- a/Sources/WebAuthn/Helpers/ChallengeGenerator.swift
+++ b/Sources/WebAuthn/Helpers/ChallengeGenerator.swift
@@ -11,10 +11,12 @@
 //
 //===----------------------------------------------------------------------===//
 
-package struct ChallengeGenerator: Sendable {
+public struct ChallengeGenerator: Sendable {
+    public static let challengeSize: Int = 32
+
     var generate: @Sendable () -> [UInt8]
 
     package static var live: Self {
-        .init(generate: { [UInt8].random(count: 32) })
+        .init(generate: { [UInt8].random(count: challengeSize) })
     }
 }
diff --git a/Sources/WebAuthn/Helpers/Duration+Milliseconds.swift b/Sources/WebAuthn/Helpers/Duration+Milliseconds.swift
index 4a3c3b9..372ecb4 100644
--- a/Sources/WebAuthn/Helpers/Duration+Milliseconds.swift
+++ b/Sources/WebAuthn/Helpers/Duration+Milliseconds.swift
@@ -11,7 +11,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-extension Duration {
+public extension Duration {
     /// The value of a positive duration in milliseconds, suitable to be encoded in WebAuthn types.
     var milliseconds: Int64 {
         let (seconds, attoseconds) = self.components
diff --git a/Sources/WebAuthn/Helpers/KeyedDecodingContainer+decodeURLEncoded.swift b/Sources/WebAuthn/Helpers/KeyedDecodingContainer+decodeURLEncoded.swift
index e6af1b5..3a93451 100644
--- a/Sources/WebAuthn/Helpers/KeyedDecodingContainer+decodeURLEncoded.swift
+++ b/Sources/WebAuthn/Helpers/KeyedDecodingContainer+decodeURLEncoded.swift
@@ -14,7 +14,7 @@
 import Foundation
 
 extension KeyedDecodingContainer {
-    func decodeBytesFromURLEncodedBase64(forKey key: KeyedDecodingContainer.Key) throws -> [UInt8] {
+    public func decodeBytesFromURLEncodedBase64(forKey key: KeyedDecodingContainer.Key) throws -> [UInt8] {
         guard let bytes = try decode(
             URLEncodedBase64.self,
             forKey: key
@@ -28,7 +28,7 @@ extension KeyedDecodingContainer {
         return bytes
     }
 
-    func decodeBytesFromURLEncodedBase64IfPresent(forKey key: KeyedDecodingContainer.Key) throws -> [UInt8]? {
+    public func decodeBytesFromURLEncodedBase64IfPresent(forKey key: KeyedDecodingContainer.Key) throws -> [UInt8]? {
         guard let bytes = try decodeIfPresent(
             URLEncodedBase64.self,
             forKey: key