54 lines
1.5 KiB
C#
54 lines
1.5 KiB
C#
using System;
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using System.Collections;
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using System.IO;
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namespace Org.BouncyCastle.Crypto.Tls;
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public abstract class TlsSRTPUtils
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{
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public static void AddUseSrtpExtension(IDictionary extensions, UseSrtpData useSRTPData)
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{
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extensions[14] = CreateUseSrtpExtension(useSRTPData);
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}
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public static UseSrtpData GetUseSrtpExtension(IDictionary extensions)
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{
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byte[] extensionData = TlsUtilities.GetExtensionData(extensions, 14);
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if (extensionData != null)
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{
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return ReadUseSrtpExtension(extensionData);
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}
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return null;
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}
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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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{
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throw new ArgumentNullException("useSrtpData");
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}
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MemoryStream memoryStream = new MemoryStream();
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TlsUtilities.WriteUint16ArrayWithUint16Length(useSrtpData.ProtectionProfiles, memoryStream);
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TlsUtilities.WriteOpaque8(useSrtpData.Mki, memoryStream);
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return memoryStream.ToArray();
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}
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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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{
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throw new ArgumentNullException("extensionData");
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}
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MemoryStream memoryStream = new MemoryStream(extensionData, writable: true);
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int num = TlsUtilities.ReadUint16(memoryStream);
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if (num < 2 || (num & 1) != 0)
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{
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throw new TlsFatalAlert(50);
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}
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int[] protectionProfiles = TlsUtilities.ReadUint16Array(num / 2, memoryStream);
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byte[] mki = TlsUtilities.ReadOpaque8(memoryStream);
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TlsProtocol.AssertEmpty(memoryStream);
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return new UseSrtpData(protectionProfiles, mki);
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}
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}
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