Initial Commit

iTechSharp/srcbc/asn1/DerUTCTime.cs

@@ -0,0 +1,259 @@
+using System;
+using System.Globalization;
+using System.Text;
+
+namespace Org.BouncyCastle.Asn1
+{
+    /**
+     * UTC time object.
+     */
+    public class DerUtcTime
+        : Asn1Object
+    {
+        private readonly string time;
+
+		/**
+         * return an UTC Time from the passed in object.
+         *
+         * @exception ArgumentException if the object cannot be converted.
+         */
+        public static DerUtcTime GetInstance(
+            object obj)
+        {
+            if (obj == null || obj is DerUtcTime)
+            {
+                return (DerUtcTime)obj;
+            }
+
+            if (obj is Asn1OctetString)
+            {
+                return new DerUtcTime(((Asn1OctetString)obj).GetOctets());
+            }
+
+            throw new ArgumentException("illegal object in GetInstance: " + obj.GetType().Name);
+        }
+
+        /**
+         * return an UTC Time from a tagged object.
+         *
+         * @param obj the tagged object holding the object we want
+         * @param explicitly true if the object is meant to be explicitly
+         *              tagged false otherwise.
+         * @exception ArgumentException if the tagged object cannot
+         *               be converted.
+         */
+        public static DerUtcTime GetInstance(
+            Asn1TaggedObject	obj,
+            bool				explicitly)
+        {
+            return GetInstance(obj.GetObject());
+        }
+
+        /**
+         * The correct format for this is YYMMDDHHMMSSZ (it used to be that seconds were
+         * never encoded. When you're creating one of these objects from scratch, that's
+         * what you want to use, otherwise we'll try to deal with whatever Gets read from
+         * the input stream... (this is why the input format is different from the GetTime()
+         * method output).
+         * <p>
+         * @param time the time string.</p>
+         */
+        public DerUtcTime(
+            string time)
+        {
+			if (time == null)
+				throw new ArgumentNullException("time");
+
+			this.time = time;
+
+			try
+			{
+				ToDateTime();
+			}
+			catch (FormatException e)
+			{
+				throw new ArgumentException("invalid date string: " + e.Message);
+			}
+        }
+
+		/**
+         * base constructor from a DateTime object
+         */
+        public DerUtcTime(
+            DateTime time)
+        {
+            this.time = time.ToString("yyMMddHHmmss") + "Z";
+        }
+
+		internal DerUtcTime(
+            byte[] bytes)
+        {
+            //
+            // explicitly convert to characters
+            //
+			this.time = Encoding.ASCII.GetString(bytes, 0, bytes.Length);
+        }
+
+//		public DateTime ToDateTime()
+//		{
+//			string tm = this.AdjustedTimeString;
+//
+//			return new DateTime(
+//				Int16.Parse(tm.Substring(0, 4)),
+//				Int16.Parse(tm.Substring(4, 2)),
+//				Int16.Parse(tm.Substring(6, 2)),
+//				Int16.Parse(tm.Substring(8, 2)),
+//				Int16.Parse(tm.Substring(10, 2)),
+//				Int16.Parse(tm.Substring(12, 2)));
+//		}
+
+		/**
+		 * return the time as a date based on whatever a 2 digit year will return. For
+		 * standardised processing use ToAdjustedDateTime().
+		 *
+		 * @return the resulting date
+		 * @exception ParseException if the date string cannot be parsed.
+		 */
+		public DateTime ToDateTime()
+		{
+			return ParseDateString(TimeString, @"yyMMddHHmmss'GMT'zzz");
+		}
+
+		/**
+		* return the time as an adjusted date
+		* in the range of 1950 - 2049.
+		*
+		* @return a date in the range of 1950 to 2049.
+		* @exception ParseException if the date string cannot be parsed.
+		*/
+		public DateTime ToAdjustedDateTime()
+		{
+			return ParseDateString(AdjustedTimeString, @"yyyyMMddHHmmss'GMT'zzz");
+		}
+
+		private DateTime ParseDateString(
+			string	dateStr,
+			string	formatStr)
+		{
+			DateTime dt = DateTime.ParseExact(
+				dateStr,
+				formatStr,
+				DateTimeFormatInfo.InvariantInfo);
+
+			return dt.ToUniversalTime();
+		}
+
+		/**
+         * return the time - always in the form of
+         *  YYMMDDhhmmssGMT(+hh:mm|-hh:mm).
+         * <p>
+         * Normally in a certificate we would expect "Z" rather than "GMT",
+         * however adding the "GMT" means we can just use:
+         * <pre>
+         *     dateF = new SimpleDateFormat("yyMMddHHmmssz");
+         * </pre>
+         * To read in the time and Get a date which is compatible with our local
+         * time zone.</p>
+         * <p>
+         * <b>Note:</b> In some cases, due to the local date processing, this
+         * may lead to unexpected results. If you want to stick the normal
+         * convention of 1950 to 2049 use the GetAdjustedTime() method.</p>
+         */
+        public string TimeString
+        {
+			get
+			{
+				//
+				// standardise the format.
+				//
+				if (time.IndexOf('-') < 0 && time.IndexOf('+') < 0)
+				{
+					if (time.Length == 11)
+					{
+						return time.Substring(0, 10) + "00GMT+00:00";
+					}
+					else
+					{
+						return time.Substring(0, 12) + "GMT+00:00";
+					}
+				}
+				else
+				{
+					int index = time.IndexOf('-');
+					if (index < 0)
+					{
+						index = time.IndexOf('+');
+					}
+					string d = time;
+
+					if (index == time.Length - 3)
+					{
+						d += "00";
+					}
+
+					if (index == 10)
+					{
+						return d.Substring(0, 10) + "00GMT" + d.Substring(10, 3) + ":" + d.Substring(13, 2);
+					}
+					else
+					{
+						return d.Substring(0, 12) + "GMT" + d.Substring(12, 3) + ":" +  d.Substring(15, 2);
+					}
+				}
+			}
+        }
+
+		[Obsolete("Use 'AdjustedTimeString' property instead")]
+		public string AdjustedTime
+		{
+			get { return AdjustedTimeString; }
+		}
+
+		/// <summary>
+		/// Return a time string as an adjusted date with a 4 digit year.
+		/// This goes in the range of 1950 - 2049.
+		/// </summary>
+		public string AdjustedTimeString
+		{
+			get
+			{
+				string d = TimeString;
+				string c = d[0] < '5' ? "20" : "19";
+
+				return c + d;
+			}
+		}
+
+        private byte[] GetOctets()
+        {
+			return Encoding.ASCII.GetBytes(time);
+        }
+
+		internal override void Encode(
+            DerOutputStream derOut)
+        {
+            derOut.WriteEncoded(Asn1Tags.UtcTime, GetOctets());
+        }
+
+		protected override bool Asn1Equals(
+			Asn1Object asn1Object)
+		{
+			DerUtcTime other = asn1Object as DerUtcTime;
+
+			if (other == null)
+				return false;
+
+			return this.time.Equals(other.time);
+        }
+
+		protected override int Asn1GetHashCode()
+		{
+            return time.GetHashCode();
+        }
+
+		public override string ToString()
+		{
+			return time;
+		}
+	}
+}