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package org.spongycastle.crypto.tls;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Hashtable;
import org.spongycastle.util.Integers;
/**
* RFC 5764 DTLS Extension to Establish Keys for SRTP.
*/
public class TlsSRTPUtils
{
public static final Integer EXT_use_srtp = Integers.valueOf(ExtensionType.use_srtp);
public static void addUseSRTPExtension(Hashtable extensions, UseSRTPData useSRTPData)
throws IOException
{
extensions.put(EXT_use_srtp, createUseSRTPExtension(useSRTPData));
}
public static UseSRTPData getUseSRTPExtension(Hashtable extensions)
throws IOException
{
byte[] extensionData = TlsUtils.getExtensionData(extensions, EXT_use_srtp);
return extensionData == null ? null : readUseSRTPExtension(extensionData);
}
public static byte[] createUseSRTPExtension(UseSRTPData useSRTPData)
throws IOException
{
if (useSRTPData == null)
{
throw new IllegalArgumentException("'useSRTPData' cannot be null");
}
ByteArrayOutputStream buf = new ByteArrayOutputStream();
// SRTPProtectionProfiles
TlsUtils.writeUint16ArrayWithUint16Length(useSRTPData.getProtectionProfiles(), buf);
// srtp_mki
TlsUtils.writeOpaque8(useSRTPData.getMki(), buf);
return buf.toByteArray();
}
public static UseSRTPData readUseSRTPExtension(byte[] extensionData)
throws IOException
{
if (extensionData == null)
{
throw new IllegalArgumentException("'extensionData' cannot be null");
}
ByteArrayInputStream buf = new ByteArrayInputStream(extensionData);
// SRTPProtectionProfiles
int length = TlsUtils.readUint16(buf);
if (length < 2 || (length & 1) != 0)
{
throw new TlsFatalAlert(AlertDescription.decode_error);
}
int[] protectionProfiles = TlsUtils.readUint16Array(length / 2, buf);
// srtp_mki
byte[] mki = TlsUtils.readOpaque8(buf);
TlsProtocol.assertEmpty(buf);
return new UseSRTPData(protectionProfiles, mki);
}
}
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