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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;

class Timeout
{
    private long durationMillis;
    private long startMillis;

    Timeout(long durationMillis)
    {
        this(durationMillis, System.currentTimeMillis());
    }

    Timeout(long durationMillis, long currentTimeMillis)
    {
        this.durationMillis = Math.max(0, durationMillis);
        this.startMillis = Math.max(0, currentTimeMillis);
    }

//    long remainingMillis()
//    {
//        return remainingMillis(System.currentTimeMillis());
//    }

    synchronized long remainingMillis(long currentTimeMillis)
    {
        // If clock jumped backwards, reset start time 
        if (startMillis > currentTimeMillis)
        {
            startMillis = currentTimeMillis;
            return durationMillis;
        }

        long elapsed = currentTimeMillis - startMillis;
        long remaining = durationMillis - elapsed;

        // Once timeout reached, lock it in
        if (remaining <= 0)
        {
            return durationMillis = 0L;
        }

        return remaining;
    }

//    static int constrainWaitMillis(int waitMillis, Timeout timeout)
//    {
//        return constrainWaitMillis(waitMillis, timeout, System.currentTimeMillis());
//    }

    static int constrainWaitMillis(int waitMillis, Timeout timeout, long currentTimeMillis)
    {
        if (waitMillis < 0)
        {
            return -1;
        }

        int timeoutMillis = getWaitMillis(timeout, currentTimeMillis);
        if (timeoutMillis < 0)
        {
            return -1;
        }

        if (waitMillis == 0)
        {
            return timeoutMillis;
        }
        if (timeoutMillis == 0)
        {
            return waitMillis;
        }

        return Math.min(waitMillis, timeoutMillis);
    }

    static Timeout forWaitMillis(int waitMillis)
    {
        return forWaitMillis(waitMillis, System.currentTimeMillis());
    }

    static Timeout forWaitMillis(int waitMillis, long currentTimeMillis)
    {
        if (waitMillis < 0)
        {
            throw new IllegalArgumentException("'waitMillis' cannot be negative");
        }
        if (waitMillis > 0)
        {
            return new Timeout(waitMillis, currentTimeMillis);
        }
        return null;
    }

//    static int getWaitMillis(Timeout timeout)
//    {
//        return getWaitMillis(timeout, System.currentTimeMillis());
//    }

    static int getWaitMillis(Timeout timeout, long currentTimeMillis)
    {
        if (null == timeout)
        {
            return 0;
        }
        long remainingMillis = timeout.remainingMillis(currentTimeMillis);
        if (remainingMillis < 1L)
        {
            return -1;
        }
        if (remainingMillis > Integer.MAX_VALUE)
        {
            return Integer.MAX_VALUE;
        }
        return (int)remainingMillis;
    }

//    static boolean hasExpired(Timeout timeout)
//    {
//        return hasExpired(timeout, System.currentTimeMillis());
//    }

    static boolean hasExpired(Timeout timeout, long currentTimeMillis)
    {
        return null != timeout && timeout.remainingMillis(currentTimeMillis) < 1L;
    }
}