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The Long Term Stable (LTS) Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains the JCA/JCE provider and low-level API for the BC LTS version 2.73.7 for Java 8 and later.

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package org.bouncycastle.crypto;

public interface EncapsulatedSecretExtractor
{
    /**
     * Extract the secret based on the recipient private key.
     *
     * @param encapsulation the encapsulated secret.
     */
    byte[] extractSecret(byte[] encapsulation);

    /**
     * Return the length in bytes of the encapsulation.
     *
     * @return length in bytes of an encapsulation for this parameter set.
     */
    int getEncapsulationLength();
}