2005-12-26 Zoltan Varga <vargaz@gmail.com>

[mono.git] / mcs / class / corlib / Mono.Security / ASN1Convert.cs

diff --git a/mcs/class/corlib/Mono.Security/ASN1Convert.cs b/mcs/class/corlib/Mono.Security/ASN1Convert.cs
index 5840f9e549ad4ae3bbc4b64283c84529bfe7daf9..e9bf8176f9e787705aa6feda900eba62bc6c4971 100644 (file)
--- a/mcs/class/corlib/Mono.Security/ASN1Convert.cs
+++ b/mcs/class/corlib/Mono.Security/ASN1Convert.cs
@@ -6,12 +6,8 @@
 //     Jesper Pedersen  <jep@itplus.dk>
 //
 // (C) 2003 Motus Technologies Inc. (http://www.motus.com)
-// (C) 2004 Novell (http://www.novell.com)
 // (C) 2004 IT+ A/S (http://www.itplus.dk)
-//
-
-//
-// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
+// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
 //
 // Permission is hereby granted, free of charge, to any person obtaining
 // a copy of this software and associated documentation files (the
@@ -50,12 +46,15 @@ namespace Mono.Security {
 #else
        public
 #endif
+#if NET_2_0
+       static class ASN1Convert {
+#else
        sealed class ASN1Convert {
 
                private ASN1Convert ()
                {
                }
-
+#endif
                // RFC3280, section 4.2.1.5
                // CAs conforming to this profile MUST always encode certificate
                // validity dates through the year 2049 as UTCTime; certificate validity
@@ -112,10 +111,12 @@ namespace Mono.Security {
                {
                        if (big == null)
                                throw new ArgumentNullException ("big");
-                               
-                       if (big [0] != 0x00) {
-                               // this first byte is added so we're sure this is an unsigned integer
-                               // however we can't feed it into RSAParameters or DSAParameters
+
+                       // check for numbers that could be interpreted as negative (first bit)
+                       if (big [0] >= 0x80) {
+                               // in thie cas we add a new, empty, byte (position 0) so we're
+                               // sure this will always be interpreted an unsigned integer.
+                               // However we can't feed it into RSAParameters or DSAParameters
                                int length = big.Length + 1;
                                byte[] uinteger = new byte [length];
                                Buffer.BlockCopy (big, 0, uinteger, 1, length - 1);