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The Bouncy Castle Java APIs for the OpenPGP Protocol. 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.openpgp.operator.jcajce;

import java.io.IOException;
import java.io.OutputStream;
import java.security.MessageDigest;

class DigestUpdatingOutputStream
    extends OutputStream
{
    private MessageDigest digest;

    DigestUpdatingOutputStream(MessageDigest digest)
    {
        this.digest = digest;
    }

    public void write(byte[] bytes, int off, int len)
        throws IOException
    {
        digest.update(bytes, off, len);
    }

    public void write(byte[] bytes)
        throws IOException
    {
        digest.update(bytes);
    }

    public void write(int b)
        throws IOException
    {
        digest.update((byte)b);
    }
}