1 files changed, 40 insertions, 0 deletions
diff --git a/Crypto/src/crypto/IDSA.cs b/Crypto/src/crypto/IDSA.cs
new file mode 100644
index 000000000..46056d8ca
--- /dev/null
+++ b/Crypto/src/crypto/IDSA.cs
@@ -0,0 +1,40 @@
+using System;
+using Org.BouncyCastle.Math;
+
+namespace Org.BouncyCastle.Crypto
+{
+    /**
+     * interface for classes implementing the Digital Signature Algorithm
+     */
+    public interface IDsa
+    {
+		string AlgorithmName { get; }
+
+		/**
+         * initialise the signer for signature generation or signature
+         * verification.
+         *
+         * @param forSigning true if we are generating a signature, false
+         * otherwise.
+         * @param param key parameters for signature generation.
+         */
+        void Init(bool forSigning, ICipherParameters parameters);
+
+        /**
+         * sign the passed in message (usually the output of a hash function).
+         *
+         * @param message the message to be signed.
+         * @return two big integers representing the r and s values respectively.
+         */
+        BigInteger[] GenerateSignature(byte[] message);
+
+        /**
+         * verify the message message against the signature values r and s.
+         *
+         * @param message the message that was supposed to have been signed.
+         * @param r the r signature value.
+         * @param s the s signature value.
+         */
+        bool VerifySignature(byte[] message, BigInteger  r, BigInteger s);
+    }
+}