Code:
/ WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / ServiceModel / System / ServiceModel / Security / NonceCache.cs / 1 / NonceCache.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace System.ServiceModel.Security { using System.Collections; using System.Globalization; using System.IO; ////// This is the in-memory nonce-cache used for turnkey replay detection. /// The nonce cache is based on a hashtable implementation for fast lookups. /// The hashcode is computed based on the nonce byte array. /// The nonce cache periodically purges stale nonce entries. /// sealed class NonceCache { NonceCacheImpl cacheImpl; TimeSpan cachingTime; int maxCachedNonces; public NonceCache(TimeSpan cachingTime, int maxCachedNonces) { if (cachingTime <= TimeSpan.Zero) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("cachingTime", SR.GetString(SR.TimeSpanMustbeGreaterThanTimeSpanZero))); } this.cacheImpl = new NonceCacheImpl(cachingTime, maxCachedNonces); this.cachingTime = cachingTime; this.maxCachedNonces = maxCachedNonces; } public TimeSpan CachingTimeSpan { get { return this.cachingTime; } } public int MaxCachedNonces { get { return this.maxCachedNonces; } } public bool CheckNonce(byte[] nonce) { return this.cacheImpl.CheckNonce(nonce); } public bool TryAddNonce(byte[] nonce) { return this.cacheImpl.TryAddNonce(nonce); } public override string ToString() { StringWriter writer = new StringWriter(CultureInfo.InvariantCulture); writer.WriteLine("NonceCache:"); writer.WriteLine(" Caching Timespan: {0}", this.CachingTimeSpan); writer.WriteLine(" Capacity: {0}", this.MaxCachedNonces); return writer.ToString(); } internal sealed class NonceCacheImpl : TimeBoundedCache { static NonceKeyComparer comparer = new NonceKeyComparer(); static object dummyItem = new Object(); // if there are less than lowWaterMark entries, no purging is done static int lowWaterMark = 50; // We created a key for the nonce using the first 4 bytes, and hence the minimum length of nonce // that can be added to the cache. static int minimumNonceLength = 4; TimeSpan cachingTimeSpan; public NonceCacheImpl(TimeSpan cachingTimeSpan, int maxCachedNonces) : base(lowWaterMark, maxCachedNonces, comparer, PurgingMode.AccessBasedPurge, TimeSpan.FromTicks(cachingTimeSpan.Ticks >> 2), false) { this.cachingTimeSpan = cachingTimeSpan; } public bool TryAddNonce(byte[] nonce) { if (nonce == null) throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("nonce"); if (nonce.Length < minimumNonceLength) throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.NonceLengthTooShort)); DateTime expirationTime = TimeoutHelper.Add(DateTime.UtcNow, this.cachingTimeSpan); return base.TryAddItem(nonce, dummyItem, expirationTime, false); } public bool CheckNonce(byte[] nonce) { if (nonce == null) throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("nonce"); if (nonce.Length < minimumNonceLength) throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.NonceLengthTooShort)); if (base.GetItem(nonce) != null) return true; else return false; } ////// This class provides the hash-code value for the key (nonce) of the nonce cache. /// The hash code is obtained from the nonce byte array by making an int of /// the first 4 bytes /// internal sealed class NonceKeyComparer : IEqualityComparer, System.Collections.Generic.IEqualityComparer{ public int GetHashCode(object o) { return GetHashCode((byte[])o); } public int GetHashCode(byte[] o) { byte[] nonce = (byte[])o; return (((int)nonce[0]) | (((int)nonce[1]) << 8) | (((int)nonce[2]) << 16) | (((int)nonce[3]) << 24)); } public int Compare(object x, object y) { return Compare((byte[])x, (byte[])y); } public int Compare(byte[] x, byte[] y) { if (Object.ReferenceEquals(x, y)) return 0; if (x == null) return -1; else if (y == null) return 1; byte[] nonce1 = (byte[])x; int length1 = nonce1.Length; byte[] nonce2 = (byte[])y; int length2 = nonce2.Length; if (length1 == length2) { for (int i = 0; i < length1; ++i) { int diff = ((int)nonce1[i] - (int)nonce2[i]); if (diff != 0) { return diff; } } return 0; } else if (length1 > length2) { return 1; } else { return -1; } } public new bool Equals(object x, object y) { return (Compare(x, y) == 0); } public bool Equals(byte[] x, byte[] y) { return (Compare(x, y) == 0); } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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