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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 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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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();
}