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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 and up. 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.eac.operator;

import java.io.OutputStream;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;

public interface EACSigner
{
    ASN1ObjectIdentifier getUsageIdentifier();

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

    /**
     * Returns a signature based on the current data written to the stream, since the
     * start or the last call to getSignature().
     *
     * @return bytes representing the signature.
     */
    byte[] getSignature();
}