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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.crypto.io;

import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.bouncycastle.crypto.Digest;

public class DigestInputStream
    extends FilterInputStream
{
    protected Digest digest;

    public DigestInputStream(
        InputStream stream,
        Digest      digest)
    {
        super(stream);
        this.digest = digest;
    }

    public int read()
        throws IOException
    {
        int b = in.read();

        if (b >= 0)
        {
            digest.update((byte)b);
        }
        return b;
    }

    public int read(
        byte[] b,
        int off,
        int len)
        throws IOException
    {
        int n = in.read(b, off, len);
        if (n > 0)
        {
            digest.update(b, off, n);
        }
        return n;
    }

    public Digest getDigest()
    {
        return digest;
    }
}