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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 produce
 * an OutputStream that will output encrypted data.
 */
public interface OutputEncryptor
{
    /**
     * Return the algorithm identifier describing the encryption
     * algorithm and parameters this encryptor uses.
     *
     * @return algorithm oid and parameters.
     */
    AlgorithmIdentifier getAlgorithmIdentifier();

    /**
     * Wrap the passed in output stream encOut, returning an output stream
     * that encrypts anything passed in before sending on to encOut.
     *
     * @param encOut output stream for encrypted output.
     * @return an encrypting OutputStream
     */
    OutputStream getOutputStream(OutputStream encOut);

    /**
     * Return the key used for encrypting the output.
     *
     * @return the encryption key.
     */
    GenericKey getKey();
}