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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;

/**
 * General interface fdr classes that produce and validate commitments.
 */
public interface Committer
{
    /**
     * Generate a commitment for the passed in message.
     *
     * @param message the message to be committed to,
     * @return a Commitment
     */
    Commitment commit(byte[] message);

    /**
     * Return true if the passed in commitment represents a commitment to the passed in maessage.
     *
     * @param commitment a commitment previously generated.
     * @param message the message that was expected to have been committed to.
     * @return true if commitment matches message, false otherwise.
     */
    boolean isRevealed(Commitment commitment, byte[] message);
}