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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 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.est;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class CTEChunkedInputStream
    extends InputStream
{
    private InputStream src;
    int chunkLen = 0;


    public CTEChunkedInputStream(InputStream inputStream)
    {
        this.src = inputStream;
    }

    private String readEOL()
        throws IOException
    {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        int c = 0;

        for (; ; )
        {
            c = src.read();
            if (c == -1)
            {
                if (bos.size() == 0)
                {
                    return null; // End of data
                }
                // return remaining buffer
                return bos.toString().trim();
            }
            bos.write(c & 0xFF);

            if (c == '\n')
            {
                return bos.toString().trim();
            }
        }
    }

    public int read()
        throws IOException
    {
        if (chunkLen == Integer.MIN_VALUE)
        {
            return -1;
        }

        if (chunkLen == 0)
        {
            String line = null;
            do
            {
                line = readEOL();
            }
            while (line != null && line.length() == 0); // skip empty lines.
            if (line == null)
            {
                return -1;
            }
            chunkLen = Integer.parseInt(line.trim(), 16);
            if (chunkLen == 0)
            {
                // Last block, burn off last line
                readEOL();
                chunkLen = Integer.MIN_VALUE;
                return -1;
            }
        }

        int i = src.read();
        chunkLen--;
        return i;
    }
}