1 files changed, 31 insertions, 0 deletions
diff --git a/Crypto/src/util/encoders/UrlBase64Encoder.cs b/Crypto/src/util/encoders/UrlBase64Encoder.cs
new file mode 100644
index 000000000..5611a831c
--- /dev/null
+++ b/Crypto/src/util/encoders/UrlBase64Encoder.cs
@@ -0,0 +1,31 @@
+using System;
+using System.IO;
+
+namespace Org.BouncyCastle.Utilities.Encoders
+{
+	/**
+	* Convert binary data to and from UrlBase64 encoding.  This is identical to
+	* Base64 encoding, except that the padding character is "." and the other 
+	* non-alphanumeric characters are "-" and "_" instead of "+" and "/".
+	* <p>
+	* The purpose of UrlBase64 encoding is to provide a compact encoding of binary
+	* data that is safe for use as an URL parameter. Base64 encoding does not
+	* produce encoded values that are safe for use in URLs, since "/" can be 
+	* interpreted as a path delimiter; "+" is the encoded form of a space; and
+	* "=" is used to separate a name from the corresponding value in an URL 
+	* parameter.
+	* </p>
+	*/
+	public class UrlBase64Encoder
+		: Base64Encoder
+	{
+		public UrlBase64Encoder()
+		{
+			encodingTable[encodingTable.Length - 2] = (byte) '-';
+			encodingTable[encodingTable.Length - 1] = (byte) '_';
+			padding = (byte) '.';
+			// we must re-create the decoding table with the new encoded values.
+			InitialiseDecodingTable();
+		}
+	}
+}
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