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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.operator;

import java.io.OutputStream;

import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.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();
    }
}