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Packages/com.tivadar.best.http/Runtime/3rdParty/BouncyCastle/crypto/prng/SP800SecureRandom.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.Prng.Drbg;
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Security;
+
+namespace Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Prng
+{
+    public class SP800SecureRandom
+        :   SecureRandom
+    {
+        private readonly IDrbgProvider  mDrbgProvider;
+        private readonly bool           mPredictionResistant;
+        private readonly SecureRandom   mRandomSource;
+        private readonly IEntropySource mEntropySource;
+
+        private ISP80090Drbg mDrbg;
+
+        internal SP800SecureRandom(SecureRandom randomSource, IEntropySource entropySource, IDrbgProvider drbgProvider,
+            bool predictionResistant)
+            : base(null)
+        {
+            this.mRandomSource = randomSource;
+            this.mEntropySource = entropySource;
+            this.mDrbgProvider = drbgProvider;
+            this.mPredictionResistant = predictionResistant;
+        }
+
+        public override void SetSeed(byte[] seed)
+        {
+            lock (this)
+            {
+                if (mRandomSource != null)
+                {
+                    this.mRandomSource.SetSeed(seed);
+                }
+            }
+        }
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
+        public override void SetSeed(Span<byte> seed)
+        {
+            lock (this)
+            {
+                if (mRandomSource != null)
+                {
+                    this.mRandomSource.SetSeed(seed);
+                }
+            }
+        }
+#endif
+
+        public override void SetSeed(long seed)
+        {
+            lock (this)
+            {
+                // this will happen when SecureRandom() is created
+                if (mRandomSource != null)
+                {
+                    this.mRandomSource.SetSeed(seed);
+                }
+            }
+        }
+
+        public override void NextBytes(byte[] bytes)
+        {
+            NextBytes(bytes, 0, bytes.Length);
+        }
+
+        public override void NextBytes(byte[] buf, int off, int len)
+        {
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
+            NextBytes(buf.AsSpan(off, len));
+#else
+            lock (this)
+            {
+                if (mDrbg == null)
+                {
+                    mDrbg = mDrbgProvider.Get(mEntropySource);
+                }
+
+                // check if a reseed is required...
+                if (mDrbg.Generate(buf, off, len, null, mPredictionResistant) < 0)
+                {
+                    mDrbg.Reseed(null);
+                    mDrbg.Generate(buf, off, len, null, mPredictionResistant);
+                }
+            }
+#endif
+        }
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
+        public override void NextBytes(Span<byte> buffer)
+        {
+            lock (this)
+            {
+                if (mDrbg == null)
+                {
+                    mDrbg = mDrbgProvider.Get(mEntropySource);
+                }
+
+                // check if a reseed is required...
+                if (mDrbg.Generate(buffer, mPredictionResistant) < 0)
+                {
+                    mDrbg.Reseed(ReadOnlySpan<byte>.Empty);
+                    mDrbg.Generate(buffer, mPredictionResistant);
+                }
+            }
+        }
+#endif
+
+        public override byte[] GenerateSeed(int numBytes)
+        {
+            return EntropyUtilities.GenerateSeed(mEntropySource, numBytes);
+        }
+
+        /// <summary>Force a reseed of the DRBG.</summary>
+        /// <param name="additionalInput">optional additional input</param>
+        public virtual void Reseed(byte[] additionalInput)
+        {
+            lock (this)
+            {
+                if (mDrbg == null)
+                {
+                    mDrbg = mDrbgProvider.Get(mEntropySource);
+                }
+
+                mDrbg.Reseed(additionalInput);
+            }
+        }
+    }
+}
+#pragma warning restore
+#endif