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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;

public interface ContentVerifier
{
    /**
     * Return the algorithm identifier describing the signature
     * algorithm and parameters this expander supports.
     *
     * @return algorithm oid and parameters.
     */
    AlgorithmIdentifier getAlgorithmIdentifier();

    /**
     * Returns a stream that will accept data for the purpose of calculating
     * a signature for later verification. Use org.spongycastle.util.io.TeeOutputStream if you want to accumulate
     * the data on the fly as well.
     *
     * @return an OutputStream
     */
    OutputStream getOutputStream();

    /**
     * @param expected expected value of the signature on the data.
     * @return true if the signature verifies, false otherwise
     */
    boolean verify(byte[] expected);
}