1 files changed, 138 insertions, 0 deletions
diff --git a/crypto/src/asn1/DerNumericString.cs b/crypto/src/asn1/DerNumericString.cs
new file mode 100644
index 000000000..6e2715a4d
--- /dev/null
+++ b/crypto/src/asn1/DerNumericString.cs
@@ -0,0 +1,138 @@
+using System;
+using System.Text;
+
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Asn1
+{
+    /**
+     * Der NumericString object - this is an ascii string of characters {0,1,2,3,4,5,6,7,8,9, }.
+     */
+    public class DerNumericString
+        : DerStringBase
+    {
+        private readonly string str;
+
+        /**
+         * return a Numeric string from the passed in object
+         *
+         * @exception ArgumentException if the object cannot be converted.
+         */
+        public static DerNumericString GetInstance(
+            object obj)
+        {
+            if (obj == null || obj is DerNumericString)
+            {
+                return (DerNumericString)obj;
+            }
+
+            throw new ArgumentException("illegal object in GetInstance: " + obj.GetType().Name);
+        }
+
+        /**
+         * return an Numeric string 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 DerNumericString GetInstance(
+            Asn1TaggedObject	obj,
+            bool				isExplicit)
+        {
+			Asn1Object o = obj.GetObject();
+
+			if (isExplicit || o is DerNumericString)
+			{
+				return GetInstance(o);
+			}
+
+			return new DerNumericString(Asn1OctetString.GetInstance(o).GetOctets());
+        }
+
+		/**
+		 * basic constructor - with bytes.
+		 */
+		public DerNumericString(
+			byte[] str)
+            : this(Strings.FromAsciiByteArray(str), false)
+		{
+		}
+
+		/**
+		 * basic constructor -  without validation..
+		 */
+		public DerNumericString(
+			string str)
+			: this(str, false)
+		{
+		}
+
+		/**
+		* Constructor with optional validation.
+		*
+		* @param string the base string to wrap.
+		* @param validate whether or not to check the string.
+		* @throws ArgumentException if validate is true and the string
+		* contains characters that should not be in a NumericString.
+		*/
+		public DerNumericString(
+			string	str,
+			bool	validate)
+		{
+			if (str == null)
+				throw new ArgumentNullException("str");
+			if (validate && !IsNumericString(str))
+				throw new ArgumentException("string contains illegal characters", "str");
+
+			this.str = str;
+		}
+
+		public override string GetString()
+        {
+            return str;
+        }
+
+		public byte[] GetOctets()
+        {
+            return Strings.ToAsciiByteArray(str);
+        }
+
+		internal override void Encode(
+            DerOutputStream derOut)
+        {
+            derOut.WriteEncoded(Asn1Tags.NumericString, GetOctets());
+        }
+
+		protected override bool Asn1Equals(
+			Asn1Object asn1Object)
+		{
+			DerNumericString other = asn1Object as DerNumericString;
+
+			if (other == null)
+				return false;
+
+			return this.str.Equals(other.str);
+        }
+
+		/**
+		 * Return true if the string can be represented as a NumericString ('0'..'9', ' ')
+		 *
+		 * @param str string to validate.
+		 * @return true if numeric, fale otherwise.
+		 */
+		public static bool IsNumericString(
+			string str)
+		{
+			foreach (char ch in str)
+			{
+				if (ch > 0x007f || (ch != ' ' && !char.IsDigit(ch)))
+					return false;
+			}
+
+			return true;
+		}
+	}
+}