1 files changed, 72 insertions, 0 deletions
diff --git a/crypto/src/openpgp/EdDsaSigner.cs b/crypto/src/openpgp/EdDsaSigner.cs
new file mode 100644
index 000000000..0e15ac609
--- /dev/null
+++ b/crypto/src/openpgp/EdDsaSigner.cs
@@ -0,0 +1,72 @@
+using System;
+
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Bcpg.OpenPgp
+{
+    internal sealed class EdDsaSigner
+        : ISigner
+    {
+        private readonly ISigner m_signer;
+        private readonly IDigest m_digest;
+        private readonly byte[] m_digBuf;
+
+        internal EdDsaSigner(ISigner signer, IDigest digest)
+        {
+            m_signer = signer;
+            m_digest = digest;
+            m_digBuf = new byte[digest.GetDigestSize()];
+        }
+
+        public string AlgorithmName => m_signer.AlgorithmName;
+
+        public void Init(bool forSigning, ICipherParameters cipherParameters)
+        {
+            m_signer.Init(forSigning, cipherParameters);
+            m_digest.Reset();
+        }
+
+        public void Update(byte b)
+        {
+            m_digest.Update(b);
+        }
+
+        public void BlockUpdate(byte[] input, int inOff, int inLen)
+        {
+            m_digest.BlockUpdate(input, inOff, inLen);
+        }
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+        public void BlockUpdate(ReadOnlySpan<byte> input)
+        {
+            m_digest.BlockUpdate(input);
+        }
+#endif
+
+        public byte[] GenerateSignature()
+        {
+            m_digest.DoFinal(m_digBuf, 0);
+
+            m_signer.BlockUpdate(m_digBuf, 0, m_digBuf.Length);
+
+            return m_signer.GenerateSignature();
+        }
+
+        public bool VerifySignature(byte[] signature)
+        {
+            m_digest.DoFinal(m_digBuf, 0);
+
+            m_signer.BlockUpdate(m_digBuf, 0, m_digBuf.Length);
+
+            return m_signer.VerifySignature(signature);
+        }
+
+        public void Reset()
+        {
+            Arrays.Clear(m_digBuf);
+            m_signer.Reset();
+            m_digest.Reset();
+        }
+    }
+}