1 files changed, 25 insertions, 0 deletions
diff --git a/crypto/src/crypto/signers/IDsaEncoding.cs b/crypto/src/crypto/signers/IDsaEncoding.cs
new file mode 100644
index 000000000..cccc4f937
--- /dev/null
+++ b/crypto/src/crypto/signers/IDsaEncoding.cs
@@ -0,0 +1,25 @@
+using System;
+
+using Org.BouncyCastle.Math;
+
+namespace Org.BouncyCastle.Crypto.Signers
+{
+    /// <summary>
+    /// An interface for different encoding formats for DSA signatures.
+    /// </summary>
+    public interface IDsaEncoding
+    {
+        /// <summary>Decode the (r, s) pair of a DSA signature.</summary>
+        /// <param name="n">The order of the group that r, s belong to.</param>
+        /// <param name="encoding">An encoding of the (r, s) pair of a DSA signature.</param>
+        /// <returns>The (r, s) of a DSA signature, stored in an array of exactly two elements, r followed by s.</returns>
+        BigInteger[] Decode(BigInteger n, byte[] encoding);
+
+        /// <summary>Encode the (r, s) pair of a DSA signature.</summary>
+        /// <param name="n">The order of the group that r, s belong to.</param>
+        /// <param name="r">The r value of a DSA signature.</param>
+        /// <param name="s">The s value of a DSA signature.</param>
+        /// <returns>An encoding of the DSA signature given by the provided (r, s) pair.</returns>
+        byte[] Encode(BigInteger n, BigInteger r, BigInteger s);
+    }
+}