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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.crypto;

/**
 * General holding class for a commitment.
 */
public class Commitment
{
    private final byte[] secret;
    private final byte[] commitment;

    /**
     * Base constructor.
     *
     * @param secret  an encoding of the secret required to reveal the commitment.
     * @param commitment  an encoding of the sealed commitment.
     */
    public Commitment(byte[] secret, byte[] commitment)
    {
        this.secret = secret;
        this.commitment = commitment;
    }

    /**
     * The secret required to reveal the commitment.
     *
     * @return an encoding of the secret associated with the commitment.
     */
    public byte[] getSecret()
    {
        return secret;
    }

    /**
     * The sealed commitment.
     *
     * @return an encoding of the sealed commitment.
     */
    public byte[] getCommitment()
    {
        return commitment;
    }
}