68 lines
2.3 KiB
C#
68 lines
2.3 KiB
C#
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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#pragma warning disable
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using System;
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using System.Collections.Generic;
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using System.IO;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Tls
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{
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/// <summary>RFC 5764 DTLS Extension to Establish Keys for SRTP.</summary>
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public abstract class TlsSrtpUtilities
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{
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/// <exception cref="IOException"/>
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public static void AddUseSrtpExtension(IDictionary<int, byte[]> extensions, UseSrtpData useSrtpData)
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{
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extensions[ExtensionType.use_srtp] = CreateUseSrtpExtension(useSrtpData);
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}
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/// <exception cref="IOException"/>
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public static UseSrtpData GetUseSrtpExtension(IDictionary<int, byte[]> extensions)
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{
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byte[] extensionData = TlsUtilities.GetExtensionData(extensions, ExtensionType.use_srtp);
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return extensionData == null ? null : ReadUseSrtpExtension(extensionData);
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}
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/// <exception cref="IOException"/>
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public static byte[] CreateUseSrtpExtension(UseSrtpData useSrtpData)
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{
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if (useSrtpData == null)
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throw new ArgumentNullException("useSrtpData");
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MemoryStream buf = new MemoryStream();
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// SRTPProtectionProfiles
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TlsUtilities.WriteUint16ArrayWithUint16Length(useSrtpData.ProtectionProfiles, buf);
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// srtp_mki
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TlsUtilities.WriteOpaque8(useSrtpData.Mki, buf);
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return buf.ToArray();
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}
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/// <exception cref="IOException"/>
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public static UseSrtpData ReadUseSrtpExtension(byte[] extensionData)
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{
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if (extensionData == null)
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throw new ArgumentNullException("extensionData");
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MemoryStream buf = new MemoryStream(extensionData, false);
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// SRTPProtectionProfiles
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int length = TlsUtilities.ReadUint16(buf);
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if (length < 2 || (length & 1) != 0)
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throw new TlsFatalAlert(AlertDescription.decode_error);
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int[] protectionProfiles = TlsUtilities.ReadUint16Array(length / 2, buf);
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// srtp_mki
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byte[] mki = TlsUtilities.ReadOpaque8(buf);
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TlsProtocol.AssertEmpty(buf);
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return new UseSrtpData(protectionProfiles, mki);
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}
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}
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}
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#pragma warning restore
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#endif
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