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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 = Convert.ToString(0x10000 | v, 16).Substring(1).ToUpperInvariant();
return new ProtocolVersion(v, prefix + " 0x" + hex);
}
}
}
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