Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Policy / HashMembershipCondition.cs / 1 / HashMembershipCondition.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // // HashMembershipCondition.cs // // Implementation of membership condition for hashes of assemblies. // namespace System.Security.Policy { using System.Collections; using System.Runtime.Serialization; using System.Security; using System.Security.Cryptography; using System.Security.Util; using System.Threading; using System.Globalization; [Serializable] [System.Runtime.InteropServices.ComVisible(true)] public sealed class HashMembershipCondition : ISerializable, IDeserializationCallback, IMembershipCondition { private byte[] m_value = null; private HashAlgorithm m_hashAlg = null; private SecurityElement m_element = null; private object s_InternalSyncObject = null; private object InternalSyncObject { get { if (s_InternalSyncObject == null) { Object o = new Object(); Interlocked.CompareExchange(ref s_InternalSyncObject, o, null); } return s_InternalSyncObject; } } internal HashMembershipCondition() {} private HashMembershipCondition (SerializationInfo info, StreamingContext context) { m_value = (byte[]) info.GetValue("HashValue", typeof(byte[])); string hashAlgorithm = (string) info.GetValue("HashAlgorithm", typeof(string)); if (hashAlgorithm != null) m_hashAlg = HashAlgorithm.Create(hashAlgorithm); else m_hashAlg = new SHA1Managed(); } public HashMembershipCondition(HashAlgorithm hashAlg, byte[] value) { if (value == null) throw new ArgumentNullException("value"); if (hashAlg == null) throw new ArgumentNullException("hashAlg"); m_value = new byte[value.Length]; Array.Copy(value, m_value, value.Length); m_hashAlg = hashAlg; } ///void ISerializable.GetObjectData (SerializationInfo info, StreamingContext context) { info.AddValue("HashValue", this.HashValue); info.AddValue("HashAlgorithm", this.HashAlgorithm.ToString()); } /// void IDeserializationCallback.OnDeserialization (Object sender) {} public HashAlgorithm HashAlgorithm { set { if (value == null) throw new ArgumentNullException("HashAlgorithm"); m_hashAlg = value; } get { if (m_hashAlg == null && m_element != null) ParseHashAlgorithm(); return m_hashAlg; } } public byte[] HashValue { set { if (value == null) throw new ArgumentNullException("value"); m_value = new byte[value.Length]; Array.Copy(value, m_value, value.Length); } get { if (m_value == null && m_element != null) ParseHashValue(); if (m_value == null) return null; byte[] value = new byte[m_value.Length]; Array.Copy(m_value, value, m_value.Length); return value; } } public bool Check(Evidence evidence) { if (evidence == null) return false; IEnumerator enumerator = evidence.GetHostEnumerator(); while (enumerator.MoveNext()) { Object obj = enumerator.Current; if (obj is Hash) { if (m_value == null && m_element != null) ParseHashValue(); if (m_hashAlg == null && m_element != null) ParseHashAlgorithm(); byte[] asmHash = null; lock (InternalSyncObject) { asmHash = ((Hash)obj).GenerateHash(m_hashAlg); } if (asmHash != null && CompareArrays(asmHash, m_value)) return true; } } return false; } public IMembershipCondition Copy() { if (m_value == null && m_element != null) ParseHashValue(); if (m_hashAlg == null && m_element != null) ParseHashAlgorithm(); return new HashMembershipCondition(m_hashAlg, m_value); } public SecurityElement ToXml() { return ToXml(null); } public void FromXml(SecurityElement e) { FromXml(e, null); } public SecurityElement ToXml(PolicyLevel level) { if (m_value == null && m_element != null) ParseHashValue(); if (m_hashAlg == null && m_element != null) ParseHashAlgorithm(); SecurityElement root = new SecurityElement("IMembershipCondition"); XMLUtil.AddClassAttribute(root, this.GetType(), "System.Security.Policy.HashMembershipCondition"); // If you hit this assert then most likely you are trying to change the name of this class. // This is ok as long as you change the hard coded string above and change the assert below. BCLDebug.Assert(this.GetType().FullName.Equals("System.Security.Policy.HashMembershipCondition"), "Class name changed!"); root.AddAttribute("version", "1"); if (m_value != null) root.AddAttribute(s_tagHashValue, Hex.EncodeHexString(HashValue)); if (m_hashAlg != null) root.AddAttribute(s_tagHashAlgorithm, HashAlgorithm.GetType().FullName); return root; } public void FromXml(SecurityElement e, PolicyLevel level) { if (e == null) throw new ArgumentNullException("e"); if (!e.Tag.Equals("IMembershipCondition")) throw new ArgumentException(Environment.GetResourceString("Argument_MembershipConditionElement")); lock (InternalSyncObject) { m_element = e; m_value = null; m_hashAlg = null; } } public override bool Equals(Object o) { HashMembershipCondition that = (o as HashMembershipCondition); if (that != null) { if (this.m_hashAlg == null && this.m_element != null) this.ParseHashAlgorithm(); if (that.m_hashAlg == null && that.m_element != null) that.ParseHashAlgorithm(); if (this.m_hashAlg != null && that.m_hashAlg != null && this.m_hashAlg.GetType() == that.m_hashAlg.GetType()) { if (this.m_value == null && this.m_element != null) this.ParseHashValue(); if (that.m_value == null && that.m_element != null) that.ParseHashValue(); if (this.m_value.Length != that.m_value.Length) return false; for (int i = 0; i < m_value.Length; i++) { if (this.m_value[i] != that.m_value[i]) return false; } return true; } } return false; } public override int GetHashCode() { if (this.m_hashAlg == null && this.m_element != null) this.ParseHashAlgorithm(); int accumulator = this.m_hashAlg != null ? this.m_hashAlg.GetType().GetHashCode() : 0; if (this.m_value == null && this.m_element != null) this.ParseHashValue(); accumulator = accumulator ^ GetByteArrayHashCode(this.m_value); return accumulator; } public override string ToString() { if (m_hashAlg == null) ParseHashAlgorithm(); return String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Hash_ToString"), m_hashAlg.GetType().AssemblyQualifiedName, Hex.EncodeHexString(HashValue)); } private const string s_tagHashValue = "HashValue"; private const string s_tagHashAlgorithm = "HashAlgorithm"; private void ParseHashValue() { lock (InternalSyncObject) { if (m_element == null) return; string elHash = m_element.Attribute(s_tagHashValue); if (elHash != null) m_value = Hex.DecodeHexString(elHash); else throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Argument_InvalidXMLElement"), s_tagHashValue, this.GetType().FullName)); if (m_value != null && m_hashAlg != null) { m_element = null; } } } private void ParseHashAlgorithm() { lock (InternalSyncObject) { if (m_element == null) return; string elHashAlg = m_element.Attribute(s_tagHashAlgorithm); if (elHashAlg != null) m_hashAlg = HashAlgorithm.Create(elHashAlg); else m_hashAlg = new SHA1Managed(); if (m_value != null && m_hashAlg != null) m_element = null; } } private static bool CompareArrays(byte[] first, byte[] second) { if (first.Length != second.Length) return false; int count = first.Length; for (int i = 0; i < count; ++i) { if (first[i] != second[i]) return false; } return true; } private static int GetByteArrayHashCode(byte[] baData) { if (baData == null) return 0; int accumulator = 0; for (int i = 0; i < baData.Length; ++i) { accumulator = (accumulator << 8) ^ (int)baData[i] ^ (accumulator >> 24); } return accumulator; } } }
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- XsltConvert.cs
- StorageEndPropertyMapping.cs
- ListViewTableRow.cs
- SizeConverter.cs
- SqlConnectionFactory.cs
- SaveFileDialog.cs
- RichTextBoxAutomationPeer.cs
- CompleteWizardStep.cs
- ClockGroup.cs
- PrinterResolution.cs
- XmlReaderDelegator.cs
- BinaryObjectReader.cs
- NullableDoubleAverageAggregationOperator.cs
- WindowsPen.cs
- GridItemPattern.cs
- ToolStripDropDownClosedEventArgs.cs
- PackageDigitalSignatureManager.cs
- FileLogRecord.cs
- UserControlAutomationPeer.cs
- XmlObjectSerializer.cs
- ComponentResourceKey.cs
- TextDecoration.cs
- OutputCacheProfile.cs
- XmlDocumentFragment.cs
- FirstMatchCodeGroup.cs
- TextChange.cs
- BatchStream.cs
- SmtpSection.cs
- CodeTypeMemberCollection.cs
- odbcmetadatafactory.cs
- InfoCardSchemas.cs
- CodeMethodReturnStatement.cs
- SQLDateTime.cs
- ElementNotAvailableException.cs
- CRYPTPROTECT_PROMPTSTRUCT.cs
- DrawingVisualDrawingContext.cs
- EnumDataContract.cs
- CharacterMetricsDictionary.cs
- ListViewContainer.cs
- QilTypeChecker.cs
- GeneralTransformGroup.cs
- FormatStringEditor.cs
- AutoCompleteStringCollection.cs
- OraclePermission.cs
- AffineTransform3D.cs
- EventHandlersStore.cs
- DataGridViewComboBoxEditingControl.cs
- GenericUriParser.cs
- DbConnectionPoolIdentity.cs
- XmlSchemaAttributeGroupRef.cs
- CodeAttributeArgument.cs
- CRYPTPROTECT_PROMPTSTRUCT.cs
- CodeIndexerExpression.cs
- EmbossBitmapEffect.cs
- TypeSemantics.cs
- FillErrorEventArgs.cs
- ListSortDescription.cs
- StrokeIntersection.cs
- WeakReferenceEnumerator.cs
- XamlLoadErrorInfo.cs
- EventPrivateKey.cs
- FamilyCollection.cs
- EventProviderTraceListener.cs
- RecognitionEventArgs.cs
- SecurityDescriptor.cs
- WsdlInspector.cs
- DataGridViewComboBoxEditingControl.cs
- SafeCryptContextHandle.cs
- PagedDataSource.cs
- WindowsTab.cs
- X500Name.cs
- SpotLight.cs
- DeferredReference.cs
- VisualBasicHelper.cs
- ViewStateException.cs
- MetadataItemEmitter.cs
- AsyncResult.cs
- InputDevice.cs
- SudsWriter.cs
- StrokeCollectionDefaultValueFactory.cs
- FilterElement.cs
- RSAPKCS1SignatureFormatter.cs
- SystemPens.cs
- DataGridViewTopLeftHeaderCell.cs
- RuleSettingsCollection.cs
- FastEncoderStatics.cs
- MenuItemBinding.cs
- CheckBox.cs
- TextRangeBase.cs
- RoleGroup.cs
- CustomTypeDescriptor.cs
- ContextMarshalException.cs
- ImageMap.cs
- StickyNoteHelper.cs
- TypeHelper.cs
- InteropAutomationProvider.cs
- GetPageCompletedEventArgs.cs
- ContractCodeDomInfo.cs
- ValueTypeFixupInfo.cs
- OleDbEnumerator.cs