[Mono-bugs] [Bug 52928][Nor] New - FromBase64 throws wrong exception on invalid input

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Fri, 16 Jan 2004 04:59:32 -0500 (EST)


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Changed by dave-mono@earth.li.

http://bugzilla.ximian.com/show_bug.cgi?id=52928

--- shadow/52928	2004-01-16 04:59:32.000000000 -0500
+++ shadow/52928.tmp.8182	2004-01-16 04:59:32.000000000 -0500
@@ -0,0 +1,69 @@
+Bug#: 52928
+Product: Mono/Class Libraries
+Version: unspecified
+OS: other
+OS Details: 
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Normal
+Component: CORLIB
+AssignedTo: mono-bugs@ximian.com                            
+ReportedBy: dave-mono@earth.li               
+QAContact: mono-bugs@ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: FromBase64 throws wrong exception on invalid input
+
+Please fill in this template when reporting a bug, unless you know what you
+are doing.
+Description of Problem:
+
+
+Steps to reproduce the problem:
+1. 
+using System;
+class t1
+{   
+    static void Main(string [] args )
+      { 
+        string brokenB64 = "AB~";
+        Convert.FromBase64String(brokenB64);
+      }
+}
+
+2. Compile
+3. Run
+
+Actual Results:
+
+Unhandled Exception: System.IndexOutOfRangeException: Array index is out of
+range
+in [0x0006b] (at
+/home/sheldon/hacking/mono/raw_cvs/mcs/class/corlib/System.Security.Cryptography/FromBase64Transform.cs:164)
+System.Security.Cryptography.FromBase64Transform:DoTransform
+(byte[],int,int,byte[],int)
+in [0x00078] (at
+/home/sheldon/hacking/mono/raw_cvs/mcs/class/corlib/System.Security.Cryptography/FromBase64Transform.cs:273)
+System.Security.Cryptography.FromBase64Transform:TransformFinalBlock
+(byte[],int,int)
+in [0x0005a] (at
+/home/sheldon/hacking/mono/raw_cvs/mcs/class/corlib/System/Convert.cs:107)
+System.Convert:FromBase64CharArray (char[],int,int)
+in [0x00018] (at
+/home/sheldon/hacking/mono/raw_cvs/mcs/class/corlib/System/Convert.cs:117)
+System.Convert:FromBase64String (string)
+in <0x00013> .t1:Main (string[])
+
+
+Expected Results:
+
+Unhandled Exception: System.FormatException
+
+Additional Information:
+
+The problem is with looking up the encoded data in the lookup tables. They
+seem to assume that they will only get valid data.
+
+I might look into creating a better Base64 handling class at the weekend.