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package org.bouncycastle.crypto.tls;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.security.SecureRandom;
import java.util.Vector;
import org.bouncycastle.util.Arrays;
public abstract class DTLSProtocol {
protected final SecureRandom secureRandom;
protected DTLSProtocol(SecureRandom secureRandom) {
if (secureRandom == null)
throw new IllegalArgumentException("'secureRandom' cannot be null");
this.secureRandom = secureRandom;
}
protected void processFinished(byte[] body, byte[] expected_verify_data) throws IOException {
ByteArrayInputStream buf = new ByteArrayInputStream(body);
byte[] verify_data = TlsUtils.readFully(expected_verify_data.length, buf);
TlsProtocol.assertEmpty(buf);
if (!Arrays.constantTimeAreEqual(expected_verify_data, verify_data)) {
throw new TlsFatalAlert(AlertDescription.handshake_failure);
}
}
protected static byte[] generateCertificate(Certificate certificate) throws IOException {
ByteArrayOutputStream buf = new ByteArrayOutputStream();
certificate.encode(buf);
return buf.toByteArray();
}
protected static byte[] generateSupplementalData(Vector supplementalData) throws IOException {
ByteArrayOutputStream buf = new ByteArrayOutputStream();
TlsProtocol.writeSupplementalData(buf, supplementalData);
return buf.toByteArray();
}
protected static void validateSelectedCipherSuite(int selectedCipherSuite, short alertDescription)
throws IOException {
switch (selectedCipherSuite) {
case CipherSuite.TLS_RSA_EXPORT_WITH_RC4_40_MD5:
case CipherSuite.TLS_RSA_WITH_RC4_128_MD5:
case CipherSuite.TLS_RSA_WITH_RC4_128_SHA:
case CipherSuite.TLS_DH_anon_EXPORT_WITH_RC4_40_MD5:
case CipherSuite.TLS_DH_anon_WITH_RC4_128_MD5:
case CipherSuite.TLS_PSK_WITH_RC4_128_SHA:
case CipherSuite.TLS_DHE_PSK_WITH_RC4_128_SHA:
case CipherSuite.TLS_RSA_PSK_WITH_RC4_128_SHA:
case CipherSuite.TLS_ECDH_ECDSA_WITH_RC4_128_SHA:
case CipherSuite.TLS_ECDHE_ECDSA_WITH_RC4_128_SHA:
case CipherSuite.TLS_ECDH_RSA_WITH_RC4_128_SHA:
case CipherSuite.TLS_ECDHE_RSA_WITH_RC4_128_SHA:
case CipherSuite.TLS_ECDH_anon_WITH_RC4_128_SHA:
// TODO Alert
throw new IllegalStateException("RC4 MUST NOT be used with DTLS");
}
}
}
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