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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 to JDK 1.8. 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.operator;

import java.io.OutputStream;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.util.io.BufferingOutputStream;

/**
 * A class that explicitly buffers the data to be signed, sending it in one
 * block when ready for signing.
 */
public class BufferingContentSigner
    implements ExtendedContentSigner
{
    private final ContentSigner contentSigner;
    private final OutputStream  output;

    /**
     * Base constructor.
     *
     * @param contentSigner the content signer to be wrapped.
     */
    public BufferingContentSigner(ContentSigner contentSigner)
    {
        this.contentSigner = contentSigner;
        this.output = new BufferingOutputStream(contentSigner.getOutputStream());
    }

    /**
     * Base constructor.
     *
     * @param contentSigner the content signer to be wrapped.
     * @param bufferSize the size of the internal buffer to use.
     */
    public BufferingContentSigner(ContentSigner contentSigner, int bufferSize)
    {
        this.contentSigner = contentSigner;
        this.output = new BufferingOutputStream(contentSigner.getOutputStream(), bufferSize);
    }

    /**
     * Return the algorithm identifier supported by this signer.
     *
     * @return algorithm identifier for the signature generated.
     */
    public AlgorithmIdentifier getAlgorithmIdentifier()
    {
        return contentSigner.getAlgorithmIdentifier();
    }

    /**
     * Return the buffering stream.
     *
     * @return the output stream used to accumulate the data.
     */
    public OutputStream getOutputStream()
    {
        return output;
    }

    /**
     * Generate signature from internally buffered data.
     *
     * @return the signature calculated from the bytes written to the buffering stream.
     */
    public byte[] getSignature()
    {
        return contentSigner.getSignature();
    }


    /**
     * Return the algorithm identifier describing the digest
     * algorithm used by this signature algorithm, if known.
     *
     * @return algorithm oid and parameters, null otherwise.
     */
    public AlgorithmIdentifier getDigestAlgorithmIdentifier()
    {
        if (contentSigner instanceof ExtendedContentSigner)
        {
            return ((ExtendedContentSigner)contentSigner).getDigestAlgorithmIdentifier();
        }

        return null;
    }
}