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Assets/BestHTTP/SecureProtocol/crypto/tls/ProtocolVersion.cs

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+#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
+
+using System;
+using System.IO;
+
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Crypto.Tls
+{
+    public sealed class ProtocolVersion
+    {
+        public static readonly ProtocolVersion SSLv3 = new ProtocolVersion(0x0300, "SSL 3.0");
+        public static readonly ProtocolVersion TLSv10 = new ProtocolVersion(0x0301, "TLS 1.0");
+        public static readonly ProtocolVersion TLSv11 = new ProtocolVersion(0x0302, "TLS 1.1");
+        public static readonly ProtocolVersion TLSv12 = new ProtocolVersion(0x0303, "TLS 1.2");
+        public static readonly ProtocolVersion DTLSv10 = new ProtocolVersion(0xFEFF, "DTLS 1.0");
+        public static readonly ProtocolVersion DTLSv12 = new ProtocolVersion(0xFEFD, "DTLS 1.2");
+
+        private readonly int version;
+        private readonly String name;
+
+        private ProtocolVersion(int v, String name)
+        {
+            this.version = v & 0xffff;
+            this.name = name;
+        }
+
+        public int FullVersion
+        {
+            get { return version; }
+        }
+
+        public int MajorVersion
+        {
+            get { return version >> 8; }
+        }
+
+        public int MinorVersion
+        {
+            get { return version & 0xff; }
+        }
+
+        public bool IsDtls
+        {
+            get { return MajorVersion == 0xFE; }
+        }
+
+        public bool IsSsl
+        {
+            get { return this == SSLv3; }
+        }
+
+        public bool IsTls
+        {
+            get { return MajorVersion == 0x03; }
+        }
+
+        public ProtocolVersion GetEquivalentTLSVersion()
+        {
+            if (!IsDtls)
+            {
+                return this;
+            }
+            if (this == DTLSv10)
+            {
+                return TLSv11;
+            }
+            return TLSv12;
+        }
+
+        public bool IsEqualOrEarlierVersionOf(ProtocolVersion version)
+        {
+            if (MajorVersion != version.MajorVersion)
+            {
+                return false;
+            }
+            int diffMinorVersion = version.MinorVersion - MinorVersion;
+            return IsDtls ? diffMinorVersion <= 0 : diffMinorVersion >= 0;
+        }
+
+        public bool IsLaterVersionOf(ProtocolVersion version)
+        {
+            if (MajorVersion != version.MajorVersion)
+            {
+                return false;
+            }
+            int diffMinorVersion = version.MinorVersion - MinorVersion;
+            return IsDtls ? diffMinorVersion > 0 : diffMinorVersion < 0;
+        }
+
+        public override bool Equals(object other)
+        {
+            return this == other || (other is ProtocolVersion && Equals((ProtocolVersion)other));
+        }
+
+        public bool Equals(ProtocolVersion other)
+        {
+            return other != null && this.version == other.version;
+        }
+
+        public override int GetHashCode()
+        {
+            return version;
+        }
+
+        /// <exception cref="IOException"/>
+        public static ProtocolVersion Get(int major, int minor)
+        {
+            switch (major)
+            {
+                case 0x03:
+                {
+                    switch (minor)
+                    {
+                        case 0x00:
+                            return SSLv3;
+                        case 0x01:
+                            return TLSv10;
+                        case 0x02:
+                            return TLSv11;
+                        case 0x03:
+                            return TLSv12;
+                    }
+                    return GetUnknownVersion(major, minor, "TLS");
+                }
+                case 0xFE:
+                {
+                    switch (minor)
+                    {
+                        case 0xFF:
+                            return DTLSv10;
+                        case 0xFE:
+                            throw new TlsFatalAlert(AlertDescription.illegal_parameter);
+                        case 0xFD:
+                            return DTLSv12;
+                    }
+                    return GetUnknownVersion(major, minor, "DTLS");
+                }
+                default:
+                {
+                    throw new TlsFatalAlert(AlertDescription.illegal_parameter);
+                }
+            }
+        }
+
+        public override string ToString()
+        {
+            return name;
+        }
+
+        private static ProtocolVersion GetUnknownVersion(int major, int minor, string prefix)
+        {
+            TlsUtilities.CheckUint8(major);
+            TlsUtilities.CheckUint8(minor);
+
+            int v = (major << 8) | minor;
+            String hex = Platform.ToUpperInvariant(Convert.ToString(0x10000 | v, 16).Substring(1));
+            return new ProtocolVersion(v, prefix + " 0x" + hex);
+        }
+    }
+}
+
+#endif