70 lines
3.4 KiB
C#
70 lines
3.4 KiB
C#
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.Linq;
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using System.Xml.Linq;
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using Microsoft.AspNet.Cryptography;
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using Microsoft.AspNet.Security.DataProtection.XmlEncryption;
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using Microsoft.Framework.DependencyInjection;
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namespace Microsoft.AspNet.Security.DataProtection.AuthenticatedEncryption
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{
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internal sealed class ManagedAuthenticatedEncryptorConfigurationXmlReader : IAuthenticatedEncryptorConfigurationXmlReader
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{
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private readonly IServiceProvider _serviceProvider;
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private readonly ITypeActivator _typeActivator;
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public ManagedAuthenticatedEncryptorConfigurationXmlReader(
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[NotNull] IServiceProvider serviceProvider,
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[NotNull] ITypeActivator typeActivator)
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{
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_serviceProvider = serviceProvider;
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_typeActivator = typeActivator;
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}
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public IAuthenticatedEncryptorConfiguration FromXml([NotNull] XElement element)
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{
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// <managedEncryptor reader="{TYPE}">
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// <encryption type="{STRING}" keyLength="{INT}" />
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// <validation type="{STRING}" />
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// <secret>...</secret>
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// </managedEncryptor>
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CryptoUtil.Assert(element.Name == ManagedAuthenticatedEncryptorConfiguration.EncryptionElementName,
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@"TODO: Bad element.");
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var options = new ManagedAuthenticatedEncryptorConfigurationOptions();
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// read <encryption> element
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var encryptionElement = element.Element(ManagedAuthenticatedEncryptorConfiguration.EncryptionElementName);
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options.EncryptionAlgorithmType = Type.GetType((string)encryptionElement.Attribute("type"), throwOnError: true);
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options.EncryptionAlgorithmKeySize = (int)encryptionElement.Attribute("keyLength");
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// read <validation> element
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var validationElement = element.Element(ManagedAuthenticatedEncryptorConfiguration.ValidationElementName);
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options.ValidationAlgorithmType = Type.GetType((string)validationElement.Attribute("type"), throwOnError: true);
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// read the child of the <secret> element, then decrypt it
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var encryptedSecretElement = element.Element(ManagedAuthenticatedEncryptorConfiguration.SecretElementName).Elements().Single();
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var secretElementDecryptorTypeName = (string)encryptedSecretElement.Attribute("decryptor");
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var secretElementDecryptorType = Type.GetType(secretElementDecryptorTypeName, throwOnError: true);
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var secretElementDecryptor = (IXmlDecryptor)_typeActivator.CreateInstance(_serviceProvider, secretElementDecryptorType);
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var decryptedSecretElement = secretElementDecryptor.Decrypt(encryptedSecretElement);
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CryptoUtil.Assert(decryptedSecretElement.Name == ManagedAuthenticatedEncryptorConfiguration.SecretElementName,
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@"TODO: Bad element.");
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byte[] decryptedSecretBytes = Convert.FromBase64String((string)decryptedSecretElement);
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try
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{
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var secret = new Secret(decryptedSecretBytes);
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return new ManagedAuthenticatedEncryptorConfiguration(options, secret);
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}
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finally
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{
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Array.Clear(decryptedSecretBytes, 0, decryptedSecretBytes.Length);
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}
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}
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}
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}
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