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

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+#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
+#pragma warning disable
+using System;
+
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Parameters;
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Security;
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Utilities;
+
+namespace Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Signers
+{
+    public class GenericSigner
+        : ISigner
+    {
+        private readonly IAsymmetricBlockCipher engine;
+        private readonly IDigest digest;
+        private bool forSigning;
+
+        public GenericSigner(
+            IAsymmetricBlockCipher	engine,
+            IDigest					digest)
+        {
+            this.engine = engine;
+            this.digest = digest;
+        }
+
+        public virtual string AlgorithmName
+        {
+            get { return "Generic(" + engine.AlgorithmName + "/" + digest.AlgorithmName + ")"; }
+        }
+
+        /**
+        * initialise the signer for signing or verification.
+        *
+        * @param forSigning
+        *            true if for signing, false otherwise
+        * @param parameters
+        *            necessary parameters.
+        */
+        public virtual void Init(bool forSigning, ICipherParameters parameters)
+        {
+            this.forSigning = forSigning;
+
+            AsymmetricKeyParameter k;
+            if (parameters is ParametersWithRandom)
+            {
+                k = (AsymmetricKeyParameter)((ParametersWithRandom)parameters).Parameters;
+            }
+            else
+            {
+                k = (AsymmetricKeyParameter)parameters;
+            }
+
+            if (forSigning && !k.IsPrivate)
+                throw new InvalidKeyException("Signing requires private key.");
+
+            if (!forSigning && k.IsPrivate)
+                throw new InvalidKeyException("Verification requires public key.");
+
+            Reset();
+
+            engine.Init(forSigning, parameters);
+        }
+
+        public virtual void Update(byte input)
+        {
+            digest.Update(input);
+        }
+
+        public virtual void BlockUpdate(byte[] input, int inOff, int inLen)
+        {
+            digest.BlockUpdate(input, inOff, inLen);
+        }
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
+        public virtual void BlockUpdate(ReadOnlySpan<byte> input)
+        {
+            digest.BlockUpdate(input);
+        }
+#endif
+
+        public virtual byte[] GenerateSignature()
+        {
+            if (!forSigning)
+                throw new InvalidOperationException("GenericSigner not initialised for signature generation.");
+
+            byte[] hash = new byte[digest.GetDigestSize()];
+            digest.DoFinal(hash, 0);
+
+            return engine.ProcessBlock(hash, 0, hash.Length);
+        }
+
+        public virtual bool VerifySignature(byte[] signature)
+        {
+            if (forSigning)
+                throw new InvalidOperationException("GenericSigner not initialised for verification");
+
+            byte[] hash = new byte[digest.GetDigestSize()];
+            digest.DoFinal(hash, 0);
+
+            try
+            {
+                byte[] sig = engine.ProcessBlock(signature, 0, signature.Length);
+
+                // Extend with leading zeroes to match the digest size, if necessary.
+                if (sig.Length < hash.Length)
+                {
+                    byte[] tmp = new byte[hash.Length];
+                    Array.Copy(sig, 0, tmp, tmp.Length - sig.Length, sig.Length);
+                    sig = tmp;
+                }
+
+                return Arrays.ConstantTimeAreEqual(sig, hash);
+            }
+            catch (Exception)
+            {
+                return false;
+            }
+        }
+
+        public virtual void Reset()
+        {
+            digest.Reset();
+        }
+    }
+}
+#pragma warning restore
+#endif