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The Bouncy Castle Java APIs for the TLS, including a JSSE provider. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.tls;

import java.io.IOException;

import org.bouncycastle.tls.crypto.TlsCrypto;

public class PSKTlsServer
    extends AbstractTlsServer
{
    private static final int[] DEFAULT_CIPHER_SUITES = new int[]
    {
        CipherSuite.TLS_ECDHE_PSK_WITH_CHACHA20_POLY1305_SHA256,
        CipherSuite.TLS_ECDHE_PSK_WITH_AES_256_CBC_SHA384,
        CipherSuite.TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA256,
        CipherSuite.TLS_ECDHE_PSK_WITH_AES_256_CBC_SHA,
        CipherSuite.TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA,
        CipherSuite.TLS_DHE_PSK_WITH_CHACHA20_POLY1305_SHA256,
        CipherSuite.TLS_DHE_PSK_WITH_AES_256_GCM_SHA384,
        CipherSuite.TLS_DHE_PSK_WITH_AES_128_GCM_SHA256,
        CipherSuite.TLS_DHE_PSK_WITH_AES_256_CBC_SHA384,
        CipherSuite.TLS_DHE_PSK_WITH_AES_128_CBC_SHA256,
        CipherSuite.TLS_DHE_PSK_WITH_AES_256_CBC_SHA,
        CipherSuite.TLS_DHE_PSK_WITH_AES_128_CBC_SHA
    };

    protected TlsPSKIdentityManager pskIdentityManager;

    public PSKTlsServer(TlsCrypto crypto, TlsPSKIdentityManager pskIdentityManager)
    {
        super(crypto);

        this.pskIdentityManager = pskIdentityManager;
    }

    protected TlsCredentialedDecryptor getRSAEncryptionCredentials() throws IOException
    {
        throw new TlsFatalAlert(AlertDescription.internal_error);
    }

    protected int[] getSupportedCipherSuites()
    {
        return TlsUtils.getSupportedCipherSuites(context.getCrypto(), DEFAULT_CIPHER_SUITES);
    }

    public ProtocolVersion getMaximumVersion()
    {
        // TODO[tls13] Consider whether this class should offer TLSv13
        return ProtocolVersion.TLSv12;
    }

    public TlsCredentials getCredentials() throws IOException
    {
        int keyExchangeAlgorithm = TlsUtils.getKeyExchangeAlgorithm(selectedCipherSuite);

        switch (keyExchangeAlgorithm)
        {
        case KeyExchangeAlgorithm.DHE_PSK:
        case KeyExchangeAlgorithm.ECDHE_PSK:
        case KeyExchangeAlgorithm.PSK:
            return null;

        case KeyExchangeAlgorithm.RSA_PSK:
            return getRSAEncryptionCredentials();

        default:
            /* Note: internal error here; selected a key exchange we don't implement! */
            throw new TlsFatalAlert(AlertDescription.internal_error);
        }
    }

    public TlsPSKIdentityManager getPSKIdentityManager()
    {
        return pskIdentityManager;
    }
}