ow

CloudBuilder/CloudBuilder.Security.Service/WebAuthnAssertionPatcher.cs

@@ -67,7 +67,7 @@ namespace CloudBuilder.Security.Service
                 if (current is byte[]) return; // already decoded by the converter
                 if (current is string s && !string.IsNullOrEmpty(s))
                 {
-                    try { prop.SetValue(target, Fido2NetLib.Base64Url.Decode(s)); }
+                    try { prop.SetValue(target, MyBase64Url.Decode(s)); }
                     catch { /* leave original value; Fido2NetLib will surface a clearer error */ }
                 }
                 return;
@@ -78,7 +78,7 @@ namespace CloudBuilder.Security.Service
             {
                 if (current is string s && !string.IsNullOrEmpty(s))
                 {
-                    try { prop.SetValue(target, Fido2NetLib.Base64Url.Decode(s)); } catch { }
+                    try { prop.SetValue(target, MyBase64Url.Decode(s)); } catch { }
                 }
                 return;
             }
@@ -89,4 +89,34 @@ namespace CloudBuilder.Security.Service
             // InvalidCastException that we can diagnose from the stack trace.
         }
     }
+
+    /// <summary>
+    /// 跨平台 Base64Url，行为等价旧Fido2NetLib.Base64Url，Windows+Linux完全兼容
+    /// </summary>
+    public static class MyBase64Url
+    {
+        public static byte[] Decode(string input)
+        {
+            if (string.IsNullOrEmpty(input))
+                return null;
+
+            // base64url → 标准base64
+            input = input.Replace('-', '+').Replace('_', '/');
+            switch (input.Length % 4)
+            {
+                case 2: input += "=="; break;
+                case 3: input += "="; break;
+            }
+            return Convert.FromBase64String(input);
+        }
+
+        public static string Encode(byte[] data)
+        {
+            if (data == null) return null;
+            return Convert.ToBase64String(data)
+                .Replace('+', '-')
+                .Replace('/', '_')
+                .TrimEnd('=');
+        }
+    }
 }