2 files changed, 5 insertions, 1 deletions
diff --git a/crypto/src/crypto/generators/OpenBsdBCrypt.cs b/crypto/src/crypto/generators/OpenBsdBCrypt.cs
index 49f79f95b..da6e2b952 100644
--- a/crypto/src/crypto/generators/OpenBsdBCrypt.cs
+++ b/crypto/src/crypto/generators/OpenBsdBCrypt.cs
@@ -174,7 +174,11 @@ namespace Org.BouncyCastle.Crypto.Generators
             }
             catch (Exception nfe)
             {
+#if PORTABLE
+                throw new ArgumentException("Invalid cost factor: " + bcryptString.Substring(4, 2), "bcryptString");
+#else
                 throw new ArgumentException("Invalid cost factor: " + bcryptString.Substring(4, 2), "bcryptString", nfe);
+#endif
             }
             if (cost < 4 || cost > 31)
                 throw new ArgumentException("Invalid cost factor: " + cost + ", 4 < cost < 31 expected.");
diff --git a/crypto/src/crypto/prng/ThreadedSeedGenerator.cs b/crypto/src/crypto/prng/ThreadedSeedGenerator.cs
index 7412e4919..f12b832ee 100644
--- a/crypto/src/crypto/prng/ThreadedSeedGenerator.cs
+++ b/crypto/src/crypto/prng/ThreadedSeedGenerator.cs
@@ -113,7 +113,7 @@ namespace Org.BouncyCastle.Crypto.Prng
                 finally
                 {
 #if PORTABLE
-                    autoResetEvent.Close();
+                    autoResetEvent.Dispose();
 #endif
                 }