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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.operator.bc;

import java.io.IOException;
import java.io.OutputStream;

import org.bouncycastle.crypto.CryptoException;
import org.bouncycastle.crypto.Signer;

public class BcSignerOutputStream
    extends OutputStream
{
    private Signer sig;

    BcSignerOutputStream(Signer sig)
    {
        this.sig = sig;
    }

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

    public void write(byte[] bytes)
        throws IOException
    {
        sig.update(bytes, 0, bytes.length);
    }

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

    byte[] getSignature()
        throws CryptoException
    {
        return sig.generateSignature();
    }

    boolean verify(byte[] expected)
    {
        return sig.verifySignature(expected);
    }
}