1 files changed, 90 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/tls/DTLSProtocol.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/tls/DTLSProtocol.java
new file mode 100644
index 000000000..60ca4fe1f
--- /dev/null
+++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/tls/DTLSProtocol.java
@@ -0,0 +1,90 @@
+package org.spongycastle.crypto.tls;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.security.SecureRandom;
+import java.util.Hashtable;
+import java.util.Vector;
+
+import org.spongycastle.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 short evaluateMaxFragmentLengthExtension(Hashtable clientExtensions, Hashtable serverExtensions,
+        short alertDescription) throws IOException
+    {
+        short maxFragmentLength = TlsExtensionsUtils.getMaxFragmentLengthExtension(serverExtensions);
+        if (maxFragmentLength >= 0 && maxFragmentLength != TlsExtensionsUtils.getMaxFragmentLengthExtension(clientExtensions))
+        {
+            throw new TlsFatalAlert(alertDescription);
+        }
+        return maxFragmentLength;
+    }
+
+    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");
+        }
+    }
+}