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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;

/**
 * General interface for an operator that is able to verify a signature based
 * on data in a stream of output.
 */
public interface ContentVerifier
{
    /**
     * Return the algorithm identifier describing the signature
     * algorithm and parameters this verifier 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.bouncycastle.util.io.TeeOutputStream if you want to accumulate
     * the data on the fly as well.
     *
     * @return an OutputStream
     */
    OutputStream getOutputStream();

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