SecurityTimestamp.cs source code in C# .NET

                        Code:
                         / WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / ServiceModel / System / ServiceModel / Security / SecurityTimestamp.cs / 1 / SecurityTimestamp.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------

namespace System.ServiceModel.Security 
{
    using System.Diagnostics; 
    using System.ServiceModel.Channels; 
    using System.Globalization;
    using System.Xml; 

    sealed class SecurityTimestamp
    {
        const string DefaultFormat = "yyyy-MM-ddTHH:mm:ss.fffZ"; 
        //                            012345678901234567890123
 
        internal static readonly TimeSpan defaultTimeToLive = SecurityProtocolFactory.defaultTimestampValidityDuration; 
        char[] computedCreationTimeUtc;
        char[] computedExpiryTimeUtc; 
        DateTime creationTimeUtc;
        DateTime expiryTimeUtc;
        readonly string id;
        readonly string digestAlgorithm; 
        readonly byte[] digest;
 
        public SecurityTimestamp(DateTime creationTimeUtc, DateTime expiryTimeUtc, string id) 
            : this(creationTimeUtc, expiryTimeUtc, id, null, null)
        { 
        }

        internal SecurityTimestamp(DateTime creationTimeUtc, DateTime expiryTimeUtc, string id, string digestAlgorithm, byte[] digest)
        { 
            DiagnosticUtility.DebugAssert(creationTimeUtc.Kind == DateTimeKind.Utc, "creation time must be in UTC");
            DiagnosticUtility.DebugAssert(expiryTimeUtc.Kind == DateTimeKind.Utc, "expiry time must be in UTC"); 
 
            if (creationTimeUtc > expiryTimeUtc)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new ArgumentOutOfRangeException("recordedExpiryTime",SR.GetString(SR.CreationTimeUtcIsAfterExpiryTime)));
            }

            this.creationTimeUtc = creationTimeUtc; 
            this.expiryTimeUtc = expiryTimeUtc;
            this.id = id; 
 
            this.digestAlgorithm = digestAlgorithm;
            this.digest = digest; 
        }

        public DateTime CreationTimeUtc
        { 
            get
            { 
                return this.creationTimeUtc; 
            }
        } 

        public DateTime ExpiryTimeUtc
        {
            get 
            {
                return this.expiryTimeUtc; 
            } 
        }
 
        public string Id
        {
            get
            { 
                return this.id;
            } 
        } 

        public string DigestAlgorithm 
        {
            get
            {
                return this.digestAlgorithm; 
            }
        } 
 
        internal byte[] GetDigest()
        { 
            return this.digest;
        }

        internal char[] GetCreationTimeChars() 
        {
            if (this.computedCreationTimeUtc == null) 
            { 
                this.computedCreationTimeUtc = ToChars(ref this.creationTimeUtc);
            } 
            return this.computedCreationTimeUtc;
        }

        internal char[] GetExpiryTimeChars() 
        {
            if (this.computedExpiryTimeUtc == null) 
            { 
                this.computedExpiryTimeUtc = ToChars(ref this.expiryTimeUtc);
            } 
            return this.computedExpiryTimeUtc;
        }

        static char[] ToChars(ref DateTime utcTime) 
        {
            char[] buffer = new char[DefaultFormat.Length]; 
            int offset = 0; 

            ToChars(utcTime.Year, buffer, ref offset, 4); 
            buffer[offset++] = '-';

            ToChars(utcTime.Month, buffer, ref offset, 2);
            buffer[offset++] = '-'; 

            ToChars(utcTime.Day, buffer, ref offset, 2); 
            buffer[offset++] = 'T'; 

            ToChars(utcTime.Hour, buffer, ref offset, 2); 
            buffer[offset++] = ':';

            ToChars(utcTime.Minute, buffer, ref offset, 2);
            buffer[offset++] = ':'; 

            ToChars(utcTime.Second, buffer, ref offset, 2); 
            buffer[offset++] = '.'; 

            ToChars(utcTime.Millisecond, buffer, ref offset, 3); 
            buffer[offset++] = 'Z';

            return buffer;
        } 

        static void ToChars(int n, char[] buffer, ref int offset, int count) 
        { 
            for (int i = offset + count - 1; i >= offset; i--)
            { 
                buffer[i] = (char) ('0' + (n % 10));
                n /= 10;
            }
            DiagnosticUtility.DebugAssert(n == 0, "Overflow in encoding timestamp field"); 
            offset += count;
        } 
 
        public override string ToString()
        { 
            return string.Format(
                CultureInfo.InvariantCulture,
                "SecurityTimestamp: Id={0}, CreationTimeUtc={1}, ExpirationTimeUtc={2}",
                this.Id, 
                XmlConvert.ToString(this.CreationTimeUtc, XmlDateTimeSerializationMode.RoundtripKind),
                XmlConvert.ToString(this.ExpiryTimeUtc, XmlDateTimeSerializationMode.RoundtripKind)); 
        } 

        ///  
        /// Internal method that checks if the timestamp is fresh with respect to the
        /// timeToLive and allowedClockSkew values passed in.
        /// Throws if the timestamp is stale.
        ///  
        /// 
        ///  
        internal void ValidateRangeAndFreshness(TimeSpan timeToLive, TimeSpan allowedClockSkew) 
        {
            // Check that the creation time is less than expiry time 
            if (this.CreationTimeUtc >= this.ExpiryTimeUtc)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new MessageSecurityException(SR.GetString(SR.TimeStampHasCreationAheadOfExpiry, this.CreationTimeUtc.ToString(DefaultFormat, CultureInfo.CurrentCulture), this.ExpiryTimeUtc.ToString(DefaultFormat, CultureInfo.CurrentCulture))));
            } 

            ValidateFreshness(timeToLive, allowedClockSkew); 
        } 

        internal void ValidateFreshness(TimeSpan timeToLive, TimeSpan allowedClockSkew) 
        {
            DateTime now = DateTime.UtcNow;
            // check that the message has not expired
            if (this.ExpiryTimeUtc <= TimeoutHelper.Subtract(now, allowedClockSkew)) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new MessageSecurityException(SR.GetString(SR.TimeStampHasExpiryTimeInPast, this.ExpiryTimeUtc.ToString(DefaultFormat, CultureInfo.CurrentCulture), now.ToString(DefaultFormat, CultureInfo.CurrentCulture), allowedClockSkew))); 
            } 

            // check that creation time is not in the future (modulo clock skew) 
            if (this.CreationTimeUtc >= TimeoutHelper.Add(now, allowedClockSkew))
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new MessageSecurityException(SR.GetString(SR.TimeStampHasCreationTimeInFuture, this.CreationTimeUtc.ToString(DefaultFormat, CultureInfo.CurrentCulture), now.ToString(DefaultFormat, CultureInfo.CurrentCulture), allowedClockSkew)));
            } 

            // check that the creation time is not more than timeToLive in the past 
            if (this.CreationTimeUtc <= TimeoutHelper.Subtract(now, TimeoutHelper.Add(timeToLive, allowedClockSkew))) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new MessageSecurityException(SR.GetString(SR.TimeStampWasCreatedTooLongAgo, this.CreationTimeUtc.ToString(DefaultFormat, CultureInfo.CurrentCulture), now.ToString(DefaultFormat, CultureInfo.CurrentCulture), timeToLive, allowedClockSkew))); 
            }

            // this is a fresh timestamp
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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SecurityTimestamp.cs source code in C# .NET

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