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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.mime.test;

import java.io.ByteArrayInputStream;
import java.io.IOException;

/**
 * File to guarantee no back tracking...
 */
public class ReadOnceInputStream
    extends ByteArrayInputStream
{
    public ReadOnceInputStream(byte[] buf)
    {
        super(buf);
    }

    public boolean markSupported()
    {
        return false;
    }

    int currPos = -22;

    public int read()
    {
        if (0 > currPos)
        {
            currPos = 0;
        }
        currPos++;

        return super.read();
    }

    public int read(byte b[], int off, int len)
    {
        if (off < currPos)
        {
            throw new RuntimeException("off " + off + " > currPos " + currPos);
        }
        currPos = off;
        int res = super.read(b, off, len);
        if (res < 0)
        {
            throw new RuntimeException("off " + off + " > currPos " + currPos + " res " + res);
        }
        currPos += res;
        return res;
    }

    public int read(byte b[])
        throws IOException
    {
        int res = super.read(b);
        currPos += res;
        return res;
    }
}