http://www.bouncycastle.org/java.html: 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.
  • The Legion of the Bouncy Castle Inc. 
package org.bouncycastle.eac.operator;

import java.io.OutputStream;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;

public interface EACSignatureVerifier
{
    
Return the usage OID specifying the signature type.

Returns:algorithm oid.
/**
     * Return the usage OID specifying the signature type.
     *
     * @return algorithm oid.
     */
    ASN1ObjectIdentifier getUsageIdentifier();

    
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.

Returns:an OutputStream
/**
     * 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();

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