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67 lines
2.3 KiB
67 lines
2.3 KiB
#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; |
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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 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 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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