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;
+ }
+ }
+}
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