org.bouncycastle.tls.SSL3Utils Maven / Gradle / Ivy

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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 java.io.InputStream;
import java.io.OutputStream;

import org.bouncycastle.tls.crypto.TlsHash;
import org.bouncycastle.tls.crypto.TlsSecret;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.io.Streams;

class SSL3Utils
{
    private static final byte[] SSL_CLIENT = {0x43, 0x4C, 0x4E, 0x54};
    private static final byte[] SSL_SERVER = {0x53, 0x52, 0x56, 0x52};

    private static final byte IPAD_BYTE = (byte)0x36;
    private static final byte OPAD_BYTE = (byte)0x5C;

    private static final byte[] IPAD = genPad(IPAD_BYTE, 48);
    private static final byte[] OPAD = genPad(OPAD_BYTE, 48);

    static byte[] calculateVerifyData(TlsHandshakeHash handshakeHash, boolean isServer)
    {
        TlsHash prf = handshakeHash.forkPRFHash();
        byte[] sslSender = isServer ? SSL_SERVER : SSL_CLIENT;
        prf.update(sslSender, 0, sslSender.length);
        return prf.calculateHash();
    }

    static void completeCombinedHash(TlsContext context, TlsHash md5, TlsHash sha1)
    {
        TlsSecret masterSecret = context.getSecurityParametersHandshake().getMasterSecret();
        byte[] master_secret = context.getCrypto().adoptSecret(masterSecret).extract();

        completeHash(master_secret, md5, 48);
        completeHash(master_secret, sha1, 40);
    }

    private static void completeHash(byte[] master_secret, TlsHash hash, int padLength)
    {
        hash.update(master_secret, 0, master_secret.length);
        hash.update(IPAD, 0, padLength);

        byte[] tmp = hash.calculateHash();

        hash.update(master_secret, 0, master_secret.length);
        hash.update(OPAD, 0, padLength);
        hash.update(tmp, 0, tmp.length);
    }

    private static byte[] genPad(byte b, int count)
    {
        byte[] padding = new byte[count];
        Arrays.fill(padding, b);
        return padding;
    }

    static byte[] readEncryptedPMS(InputStream input) throws IOException
    {
        return Streams.readAll(input);
    }

    static void writeEncryptedPMS(byte[] encryptedPMS, OutputStream output) throws IOException
    {
        output.write(encryptedPMS);
    }
}