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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8 with debug enabled.
package org.bouncycastle.crypto.tls;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigInteger;
import java.util.Hashtable;
import org.bouncycastle.util.BigIntegers;
import org.bouncycastle.util.Integers;
public class TlsSRPUtils
{
public static final Integer EXT_SRP = Integers.valueOf(ExtensionType.srp);
public static void addSRPExtension(Hashtable extensions, byte[] identity) throws IOException
{
extensions.put(EXT_SRP, createSRPExtension(identity));
}
public static byte[] getSRPExtension(Hashtable extensions) throws IOException
{
byte[] extensionData = TlsUtils.getExtensionData(extensions, EXT_SRP);
return extensionData == null ? null : readSRPExtension(extensionData);
}
public static byte[] createSRPExtension(byte[] identity) throws IOException
{
if (identity == null)
{
throw new TlsFatalAlert(AlertDescription.internal_error);
}
return TlsUtils.encodeOpaque8(identity);
}
public static byte[] readSRPExtension(byte[] extensionData) throws IOException
{
if (extensionData == null)
{
throw new IllegalArgumentException("'extensionData' cannot be null");
}
ByteArrayInputStream buf = new ByteArrayInputStream(extensionData);
byte[] identity = TlsUtils.readOpaque8(buf);
TlsProtocol.assertEmpty(buf);
return identity;
}
public static BigInteger readSRPParameter(InputStream input) throws IOException
{
return new BigInteger(1, TlsUtils.readOpaque16(input));
}
public static void writeSRPParameter(BigInteger x, OutputStream output) throws IOException
{
TlsUtils.writeOpaque16(BigIntegers.asUnsignedByteArray(x), output);
}
public static boolean isSRPCipherSuite(int cipherSuite)
{
switch (cipherSuite)
{
case CipherSuite.TLS_SRP_SHA_DSS_WITH_3DES_EDE_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_DSS_WITH_AES_128_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_DSS_WITH_AES_256_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_RSA_WITH_3DES_EDE_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_RSA_WITH_AES_128_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_RSA_WITH_AES_256_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_WITH_3DES_EDE_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_WITH_AES_128_CBC_SHA:
case CipherSuite.TLS_SRP_SHA_WITH_AES_256_CBC_SHA:
return true;
default:
return false;
}
}
}
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