Changed exception thrown in error case to not get confused with the bad argumentexceptions.

2 files changed, 3 insertions, 3 deletions

diff --git a/src/DotNetOpenAuth/OpenId/ChannelElements/ReturnToSignatureBindingElement.cs b/src/DotNetOpenAuth/OpenId/ChannelElements/ReturnToSignatureBindingElement.cs
index 6c5f7a0..147d552 100644
--- a/src/DotNetOpenAuth/OpenId/ChannelElements/ReturnToSignatureBindingElement.cs
+++ b/src/DotNetOpenAuth/OpenId/ChannelElements/ReturnToSignatureBindingElement.cs
@@ -176,7 +176,7 @@ namespace DotNetOpenAuth.OpenId.ChannelElements {
 			byte[] signature;
 			try {
 				signature = this.secretManager.Sign(bytesToSign, returnToParameters[ReturnToSignatureHandleParameterName]);
-			} catch (ArgumentException ex) {
+			} catch (ProtocolException ex) {
 				throw ErrorUtilities.Wrap(ex, OpenIdStrings.MaximumAuthenticationTimeExpired);
 			}
 			string signatureBase64 = Convert.ToBase64String(signature);
diff --git a/src/DotNetOpenAuth/OpenId/RelyingParty/PrivateSecretManager.cs b/src/DotNetOpenAuth/OpenId/RelyingParty/PrivateSecretManager.cs
index ca41c03..2fad181 100644
--- a/src/DotNetOpenAuth/OpenId/RelyingParty/PrivateSecretManager.cs
+++ b/src/DotNetOpenAuth/OpenId/RelyingParty/PrivateSecretManager.cs
@@ -71,14 +71,14 @@ namespace DotNetOpenAuth.OpenId.RelyingParty {
 		/// <returns>
 		/// The signature for the given buffer using the provided handle.
 		/// </returns>
-		/// <exception cref="ArgumentException">Thrown when an association with the given handle could not be found.
+		/// <exception cref="ProtocolException">Thrown when an association with the given handle could not be found.
 		/// This most likely happens if the association was near the end of its life and the user took too long to log in.</exception>
 		internal byte[] Sign(byte[] buffer, string handle) {
 			ErrorUtilities.VerifyArgumentNotNull(buffer, "buffer");
 			ErrorUtilities.VerifyNonZeroLength(handle, "handle");
 
 			Association association = this.store.GetAssociation(SecretUri, handle);
-			ErrorUtilities.VerifyArgument(association != null, OpenIdStrings.PrivateRPSecretNotFound, handle);
+			ErrorUtilities.VerifyProtocol(association != null, OpenIdStrings.PrivateRPSecretNotFound, handle);
 			return association.Sign(buffer);
 		}