Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Policy / Hash.cs / 2 / Hash.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // // Hash // // Evidence corresponding to a hash of the assembly bits. // namespace System.Security.Policy { using Microsoft.Win32.SafeHandles; using System.Reflection; using System.Runtime.CompilerServices; using System.Runtime.ConstrainedExecution; using System.Runtime.Serialization; using System.Security.Cryptography; using System.Security.Util; [Serializable] [System.Runtime.InteropServices.ComVisible(true)] public sealed class Hash : ISerializable, IBuiltInEvidence { private SafePEFileHandle m_peFile = SafePEFileHandle.InvalidHandle; internal Hash() {} internal Hash(SerializationInfo info, StreamingContext context) { m_md5 = (byte[]) info.GetValueNoThrow("Md5", typeof(byte[])); m_sha1 = (byte[]) info.GetValueNoThrow("Sha1", typeof(byte[])); m_peFile = SafePEFileHandle.InvalidHandle; m_rawData = (byte[]) info.GetValue("RawData", typeof(byte[])); if (m_rawData == null) { IntPtr peFile = (IntPtr) info.GetValue("PEFile", typeof(IntPtr)); if (peFile != IntPtr.Zero) _SetPEFileHandle(peFile, ref m_peFile); } } public Hash(Assembly assembly) { if (assembly == null) throw new ArgumentNullException("assembly"); _GetPEFileFromAssembly(assembly.InternalAssembly, ref m_peFile); } public static Hash CreateSHA1(byte[] sha1) { if (sha1 == null) throw new ArgumentNullException("sha1"); Hash hash = new Hash(); hash.m_sha1 = new byte[sha1.Length]; Array.Copy(sha1, hash.m_sha1, sha1.Length); return hash; } public static Hash CreateMD5(byte[] md5) { if (md5 == null) throw new ArgumentNullException("md5"); Hash hash = new Hash(); hash.m_md5 = new byte[md5.Length]; Array.Copy(md5, hash.m_md5, md5.Length); return hash; } public void GetObjectData(SerializationInfo info, StreamingContext context) { new System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode).Demand(); info.AddValue("Md5", m_md5); info.AddValue("Sha1", m_sha1); if (context.State == StreamingContextStates.Clone || context.State == StreamingContextStates.CrossAppDomain) { info.AddValue("PEFile", m_peFile.DangerousGetHandle()); if (m_peFile.IsInvalid) info.AddValue("RawData", m_rawData); else info.AddValue("RawData", null); } else { if (!m_peFile.IsInvalid) m_rawData = this.RawData; info.AddValue("PEFile", IntPtr.Zero); info.AddValue("RawData", m_rawData); } } private byte[] m_rawData = null; internal byte[] RawData { get { if (m_rawData == null) { if (m_peFile.IsInvalid) throw new SecurityException(Environment.GetResourceString("Security_CannotGetRawData")); byte[] rawData = _GetRawData(m_peFile); if (rawData == null) throw new SecurityException(Environment.GetResourceString("Security_CannotGenerateHash")); m_rawData = rawData; } return m_rawData; } } private byte[] m_sha1 = null; public byte[] SHA1 { get { if (m_sha1 == null) { System.Security.Cryptography.SHA1 hashAlg = new System.Security.Cryptography.SHA1Managed(); m_sha1 = hashAlg.ComputeHash(this.RawData); } byte[] retval = new byte[m_sha1.Length]; Array.Copy(m_sha1, retval, m_sha1.Length); return retval; } } private byte[] m_md5 = null; public byte[] MD5 { get { if (m_md5 == null) { System.Security.Cryptography.MD5 hashAlg = new MD5CryptoServiceProvider(); m_md5 = hashAlg.ComputeHash(this.RawData); } byte[] retval = new byte[m_md5.Length]; Array.Copy(m_md5, retval, m_md5.Length); return retval; } } public byte[] GenerateHash(HashAlgorithm hashAlg) { if (hashAlg == null) throw new ArgumentNullException("hashAlg"); if (hashAlg is SHA1) return this.SHA1; else if (hashAlg is MD5) return this.MD5; return hashAlg.ComputeHash(this.RawData); } ///int IBuiltInEvidence.OutputToBuffer(char[] buffer, int position, bool verbose) { if (!verbose) return position; buffer[position++] = BuiltInEvidenceHelper.idHash; IntPtr ptrPEFile = IntPtr.Zero; if (!m_peFile.IsInvalid) ptrPEFile = m_peFile.DangerousGetHandle() ; BuiltInEvidenceHelper.CopyLongToCharArray((long)ptrPEFile, buffer, position); return position + 4; } /// int IBuiltInEvidence.GetRequiredSize(bool verbose) { if (verbose) return (1 + 4); // identifier + IntPtr else return 0; } /// int IBuiltInEvidence.InitFromBuffer(char[] buffer, int position) { m_peFile = SafePEFileHandle.InvalidHandle; IntPtr ptrPEFile = (IntPtr) BuiltInEvidenceHelper.GetLongFromCharArray(buffer, position); _SetPEFileHandle(ptrPEFile, ref this.m_peFile); return position + 4; } private SecurityElement ToXml() { SecurityElement root = new SecurityElement("System.Security.Policy.Hash"); // 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.Hash"), "Class name changed!"); root.AddAttribute("version", "1"); root.AddChild(new SecurityElement("RawData", Hex.EncodeHexString(this.RawData))); return root; } public override String ToString() { return ToXml().ToString(); } [MethodImplAttribute(MethodImplOptions.InternalCall)] private static extern byte[] _GetRawData(SafePEFileHandle handle); [MethodImplAttribute(MethodImplOptions.InternalCall)] private static extern void _GetPEFileFromAssembly(Assembly assembly, ref SafePEFileHandle handle); [MethodImplAttribute(MethodImplOptions.InternalCall), ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] internal static extern void _ReleasePEFile(IntPtr handle); [MethodImplAttribute(MethodImplOptions.InternalCall)] internal static extern void _SetPEFileHandle(IntPtr inHandle, ref SafePEFileHandle outHandle); } }
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