1 files changed, 115 insertions, 0 deletions
diff --git a/Crypto/src/asn1/DerBMPString.cs b/Crypto/src/asn1/DerBMPString.cs
new file mode 100644
index 000000000..4f7e0a635
--- /dev/null
+++ b/Crypto/src/asn1/DerBMPString.cs
@@ -0,0 +1,115 @@
+using System;
+
+namespace Org.BouncyCastle.Asn1
+{
+    /**
+     * Der BMPString object.
+     */
+    public class DerBmpString
+		: DerStringBase
+    {
+        private readonly string str;
+
+		/**
+         * return a BMP string from the given object.
+         *
+         * @param obj the object we want converted.
+         * @exception ArgumentException if the object cannot be converted.
+         */
+        public static DerBmpString GetInstance(
+            object obj)
+        {
+            if (obj == null || obj is DerBmpString)
+            {
+                return (DerBmpString)obj;
+            }
+
+			throw new ArgumentException("illegal object in GetInstance: " + obj.GetType().Name);
+        }
+
+        /**
+         * return a BMP 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 DerBmpString GetInstance(
+            Asn1TaggedObject	obj,
+            bool				isExplicit)
+        {
+			Asn1Object o = obj.GetObject();
+
+			if (isExplicit || o is DerBmpString)
+			{
+				return GetInstance(o);
+			}
+
+			return new DerBmpString(Asn1OctetString.GetInstance(o).GetOctets());
+        }
+
+		/**
+         * basic constructor - byte encoded string.
+         */
+        public DerBmpString(
+            byte[] str)
+        {
+			if (str == null)
+				throw new ArgumentNullException("str");
+
+            char[] cs = new char[str.Length / 2];
+
+			for (int i = 0; i != cs.Length; i++)
+            {
+                cs[i] = (char)((str[2 * i] << 8) | (str[2 * i + 1] & 0xff));
+            }
+
+			this.str = new string(cs);
+        }
+
+        /**
+         * basic constructor
+         */
+        public DerBmpString(
+            string str)
+        {
+			if (str == null)
+				throw new ArgumentNullException("str");
+
+			this.str = str;
+        }
+
+        public override string GetString()
+        {
+            return str;
+        }
+
+		protected override bool Asn1Equals(
+			Asn1Object asn1Object)
+        {
+			DerBmpString other = asn1Object as DerBmpString;
+
+			if (other == null)
+				return false;
+
+			return this.str.Equals(other.str);
+        }
+
+		internal override void Encode(
+            DerOutputStream derOut)
+        {
+            char[] c = str.ToCharArray();
+            byte[] b = new byte[c.Length * 2];
+
+			for (int i = 0; i != c.Length; i++)
+            {
+                b[2 * i] = (byte)(c[i] >> 8);
+                b[2 * i + 1] = (byte)c[i];
+            }
+
+            derOut.WriteEncoded(Asn1Tags.BmpString, b);
+        }
+    }
+}