59 lines
2.1 KiB
C#
59 lines
2.1 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="HomogenizingCryptoServiceWrapper.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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namespace System.Web.Security.Cryptography {
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using System;
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using System.Configuration;
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using System.Security.Cryptography;
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// Wraps an ICryptoService instance and homogenizes any exceptions that might occur.
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internal sealed class HomogenizingCryptoServiceWrapper : ICryptoService {
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public HomogenizingCryptoServiceWrapper(ICryptoService wrapped) {
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WrappedCryptoService = wrapped;
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}
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internal ICryptoService WrappedCryptoService {
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get;
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private set;
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}
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private static byte[] HomogenizeErrors(Func<byte[], byte[]> func, byte[] input) {
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// If the underlying method returns null or throws an exception, the
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// error will be homogenized as a single CryptographicException.
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byte[] output = null;
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bool allowExceptionToBubble = false;
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try {
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output = func(input);
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return output;
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}
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catch (ConfigurationException) {
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// ConfigurationException isn't a side channel; it means the application is misconfigured.
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// We need to bubble this up so that the developer can react to it.
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allowExceptionToBubble = true;
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throw;
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}
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finally {
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if (output == null && !allowExceptionToBubble) {
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throw new CryptographicException();
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}
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}
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}
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public byte[] Protect(byte[] clearData) {
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return HomogenizeErrors(WrappedCryptoService.Protect, clearData);
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}
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public byte[] Unprotect(byte[] protectedData) {
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return HomogenizeErrors(WrappedCryptoService.Unprotect, protectedData);
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}
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}
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}
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