1 files changed, 32 insertions, 0 deletions
diff --git a/crypto/src/asn1/Asn1BitStringParser.cs b/crypto/src/asn1/Asn1BitStringParser.cs
new file mode 100644
index 000000000..76af06d73
--- /dev/null
+++ b/crypto/src/asn1/Asn1BitStringParser.cs
@@ -0,0 +1,32 @@
+using System;
+using System.IO;
+
+namespace Org.BouncyCastle.Asn1
+{
+    public interface Asn1BitStringParser
+        : IAsn1Convertible
+    {
+        /// <summary>Return a <see cref="Stream"/> representing the contents of the BIT STRING. The final byte, if any,
+        /// may include pad bits. See <see cref="PadBits"/>.</summary>
+        /// <returns>A <see cref="Stream"/> with its source as the BIT STRING content.</returns>
+        /// <exception cref="IOException"/>
+        Stream GetBitStream();
+
+        /// <summary>Return a <see cref="Stream"/> representing the contents of the BIT STRING, where the content is
+        /// expected to be octet-aligned (this will be automatically checked during parsing).</summary>
+        /// <returns>A <see cref="Stream"/> with its source as the BIT STRING content.</returns>
+        /// <exception cref="IOException"/>
+        Stream GetOctetStream();
+
+        /// <summary>Return the number of pad bits, if any, in the final byte, if any, read from
+        /// <see cref="GetBitStream"/>.</summary>
+        /// <remarks>
+        /// This number is in the range zero to seven. That number of the least significant bits of the final byte, if
+        /// any, are not part of the contents and should be ignored. NOTE: Must be called AFTER the stream has been
+        /// fully processed. (Does not need to be called if <see cref="GetOctetStream"/> was used instead of
+        /// <see cref="GetBitStream"/>.
+        /// </remarks>
+        /// <returns>The number of pad bits. In the range zero to seven.</returns>
+        int PadBits { get; }
+    }
+}