diff --git a/Crypto/src/util/encoders/Base64.cs b/Crypto/src/util/encoders/Base64.cs
new file mode 100644
index 000000000..5dc9fae63
--- /dev/null
+++ b/Crypto/src/util/encoders/Base64.cs
@@ -0,0 +1,95 @@
+using System;
+using System.IO;
+using System.Text;
+
+namespace Org.BouncyCastle.Utilities.Encoders
+{
+ public sealed class Base64
+ {
+ private Base64()
+ {
+ }
+
+ /**
+ * encode the input data producing a base 64 encoded byte array.
+ *
+ * @return a byte array containing the base 64 encoded data.
+ */
+ public static byte[] Encode(
+ byte[] data)
+ {
+ string s = Convert.ToBase64String(data, 0, data.Length);
+ return Strings.ToAsciiByteArray(s);
+ }
+
+ /**
+ * Encode the byte data to base 64 writing it to the given output stream.
+ *
+ * @return the number of bytes produced.
+ */
+ public static int Encode(
+ byte[] data,
+ Stream outStream)
+ {
+ string s = Convert.ToBase64String(data, 0, data.Length);
+ byte[] encoded = Strings.ToAsciiByteArray(s);
+ outStream.Write(encoded, 0, encoded.Length);
+ return encoded.Length;
+ }
+
+ /**
+ * Encode the byte data to base 64 writing it to the given output stream.
+ *
+ * @return the number of bytes produced.
+ */
+ public static int Encode(
+ byte[] data,
+ int off,
+ int length,
+ Stream outStream)
+ {
+ string s = Convert.ToBase64String(data, off, length);
+ byte[] encoded = Strings.ToAsciiByteArray(s);
+ outStream.Write(encoded, 0, encoded.Length);
+ return encoded.Length;
+ }
+
+ /**
+ * decode the base 64 encoded input data. It is assumed the input data is valid.
+ *
+ * @return a byte array representing the decoded data.
+ */
+ public static byte[] Decode(
+ byte[] data)
+ {
+ string s = Strings.FromAsciiByteArray(data);
+ return Convert.FromBase64String(s);
+ }
+
+ /**
+ * decode the base 64 encoded string data - whitespace will be ignored.
+ *
+ * @return a byte array representing the decoded data.
+ */
+ public static byte[] Decode(
+ string data)
+ {
+ return Convert.FromBase64String(data);
+ }
+
+ /**
+ * decode the base 64 encoded string data writing it to the given output stream,
+ * whitespace characters will be ignored.
+ *
+ * @return the number of bytes produced.
+ */
+ public static int Decode(
+ string data,
+ Stream outStream)
+ {
+ byte[] decoded = Decode(data);
+ outStream.Write(decoded, 0, decoded.Length);
+ return decoded.Length;
+ }
+ }
+}
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