- Initial commit

Runtime/3rdParty/BouncyCastle/crypto/prng/CryptoApiRandomGenerator.cs

@@ -0,0 +1,94 @@
+#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
+#pragma warning disable
+using System;
+using System.Security.Cryptography;
+
+namespace Best.HTTP.SecureProtocol.Org.BouncyCastle.Crypto.Prng
+{
+    /// <summary>
+    /// Uses RandomNumberGenerator.Create() to get randomness generator
+    /// </summary>
+    public sealed class CryptoApiRandomGenerator
+        : IRandomGenerator, IDisposable
+    {
+        private readonly RandomNumberGenerator m_randomNumberGenerator;
+
+        public CryptoApiRandomGenerator()
+            : this(RandomNumberGenerator.Create())
+        {
+        }
+
+        public CryptoApiRandomGenerator(RandomNumberGenerator randomNumberGenerator)
+        {
+            m_randomNumberGenerator = randomNumberGenerator ??
+                throw new ArgumentNullException(nameof(randomNumberGenerator));
+        }
+
+        #region IRandomGenerator Members
+
+        public void AddSeedMaterial(byte[] seed)
+        {
+            // We don't care about the seed
+        }
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
+        public void AddSeedMaterial(ReadOnlySpan<byte> inSeed)
+        {
+            // We don't care about the seed
+        }
+#endif
+
+        public void AddSeedMaterial(long seed)
+        {
+            // We don't care about the seed
+        }
+
+        public void NextBytes(byte[] bytes)
+        {
+            m_randomNumberGenerator.GetBytes(bytes);
+        }
+
+        public void NextBytes(byte[] bytes, int start, int len)
+        {
+#if NETCOREAPP2_0_OR_GREATER || NETSTANDARD2_0_OR_GREATER
+            m_randomNumberGenerator.GetBytes(bytes, start, len);
+#else
+            if (start < 0)
+                throw new ArgumentException("Start offset cannot be negative", "start");
+            if (bytes.Length < (start + len))
+                throw new ArgumentException("Byte array too small for requested offset and length");
+
+            if (bytes.Length == len && start == 0) 
+            {
+                NextBytes(bytes);
+            }
+            else 
+            {
+                byte[] tmpBuf = new byte[len];
+                NextBytes(tmpBuf);
+                Array.Copy(tmpBuf, 0, bytes, start, len);
+            }
+#endif
+        }
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
+        public void NextBytes(Span<byte> bytes)
+        {
+            m_randomNumberGenerator.GetBytes(bytes);
+        }
+#endif
+
+        #endregion
+
+        #region IDisposable Members
+
+        public void Dispose()
+        {
+            m_randomNumberGenerator.Dispose();
+        }
+
+        #endregion
+    }
+}
+#pragma warning restore
+#endif