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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. 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.

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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 ContentSigner
{
    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();
    }
}