Index: Mono.Security.Cryptography/ChangeLog
===================================================================
--- Mono.Security.Cryptography/ChangeLog        (revision 65893)
+++ Mono.Security.Cryptography/ChangeLog        (working copy)
@@ -1,3 +1,10 @@
+2006-09-27  Sebastien Pouliot  <sebastien@ximian.com>
+
+       * RSAManaged.cs: Ensure that the results of Encrypt and Decrypt will
+       always be the same length as the key. If smaller then we left pad the
+       result with 0x00 (same integer, correct length for everyone). Fix bug
+       #79502 where an LDAP/SSL server didn't like the missing byte.
+
 2006-09-05  Sebastien Pouliot  <sebastien@ximian.com>

        * RSAManaged.cs: Backport NRE fix from mscorlib.dll.
Index: Mono.Security.Cryptography/RSAManaged.cs
===================================================================
--- Mono.Security.Cryptography/RSAManaged.cs    (revision 65893)
+++ Mono.Security.Cryptography/RSAManaged.cs    (working copy)
@@ -224,7 +224,9 @@
                                r.Clear ();
                        }

-                       byte[] result = output.GetBytes ();
+                       // it's sometimes possible for the results to be a byte short
+                       // and this can break some software (see #79502) so we 0x00 pad the result
+                       byte[] result = GetPaddedValue (output);
                        // zeroize values
                        input.Clear ();
                        output.Clear ();
@@ -241,7 +243,9 @@

                        BigInteger input = new BigInteger (rgb);
                        BigInteger output = input.ModPow (e, n);
-                       byte[] result = output.GetBytes ();
+                       // it's sometimes possible for the results to be a byte short
+                       // and this can break some software (see #79502) so we 0x00 pad the result
+                       byte[] result = GetPaddedValue (output);
                        // zeroize value
                        input.Clear ();
                        output.Clear ();
@@ -457,5 +461,20 @@
                        // possible (in case the key was imported)
                        get { return (!keypairGenerated || isCRTpossible); }
                }
+
+               private byte[] GetPaddedValue (BigInteger value)
+               {
+                       byte[] result = value.GetBytes ();
+                       int length = (KeySize >> 8);
+                       if (result.Length >= length)
+                               return result;
+
+                       // left-pad 0x00 value on the result (same integer, correct length)
+                       byte[] padded = new byte[length];
+                       Buffer.BlockCopy (result, 0, padded, (length - result.Length), result.Length);
+                       // temporary result may contain decrypted (plaintext) data, clear it
+                       Array.Clear (result, 0, result.Length);
+                       return padded;
+               }
        }
 }