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Packages/com.tivadar.best.http/Runtime/3rdParty/BouncyCastle/crypto/signers/Ed448phSigner.cs

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+#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
+#pragma warning disable
+using System;
+using System.IO;
+
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Parameters;
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Math.EC.Rfc8032;
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Utilities;
+
+namespace Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Signers
+{
+    public class Ed448phSigner
+        : ISigner
+    {
+        private readonly IXof prehash = Ed448.CreatePrehash();
+        private readonly byte[] context;
+
+        private bool forSigning;
+        private Ed448PrivateKeyParameters privateKey;
+        private Ed448PublicKeyParameters publicKey;
+
+        public Ed448phSigner(byte[] context)
+        {
+            this.context = Arrays.Clone(context);
+        }
+
+        public virtual string AlgorithmName
+        {
+            get { return "Ed448ph"; }
+        }
+
+        public virtual void Init(bool forSigning, ICipherParameters parameters)
+        {
+            this.forSigning = forSigning;
+
+            if (forSigning)
+            {
+                this.privateKey = (Ed448PrivateKeyParameters)parameters;
+                this.publicKey = null;
+            }
+            else
+            {
+                this.privateKey = null;
+                this.publicKey = (Ed448PublicKeyParameters)parameters;
+            }
+
+            Reset();
+        }
+
+        public virtual void Update(byte b)
+        {
+            prehash.Update(b);
+        }
+
+        public virtual void BlockUpdate(byte[] buf, int off, int len)
+        {
+            prehash.BlockUpdate(buf, off, len);
+        }
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
+        public virtual void BlockUpdate(ReadOnlySpan<byte> input)
+        {
+            prehash.BlockUpdate(input);
+        }
+#endif
+
+        public virtual byte[] GenerateSignature()
+        {
+            if (!forSigning || null == privateKey)
+                throw new InvalidOperationException("Ed448phSigner not initialised for signature generation.");
+
+            byte[] msg = new byte[Ed448.PrehashSize];
+            if (Ed448.PrehashSize != prehash.OutputFinal(msg, 0, Ed448.PrehashSize))
+                throw new InvalidOperationException("Prehash digest failed");
+
+            byte[] signature = new byte[Ed448PrivateKeyParameters.SignatureSize];
+            privateKey.Sign(Ed448.Algorithm.Ed448ph, context, msg, 0, Ed448.PrehashSize, signature, 0);
+            return signature;
+        }
+
+        public virtual bool VerifySignature(byte[] signature)
+        {
+            if (forSigning || null == publicKey)
+                throw new InvalidOperationException("Ed448phSigner not initialised for verification");
+            if (Ed448.SignatureSize != signature.Length)
+            {
+                prehash.Reset();
+                return false;
+            }
+
+            byte[] pk = publicKey.GetEncoded();
+            return Ed448.VerifyPrehash(signature, 0, pk, 0, context, prehash);
+        }
+
+        public void Reset()
+        {
+            prehash.Reset();
+        }
+    }
+}
+#pragma warning restore
+#endif