import org.bouncycastle.crypto.Commitment; //导入依赖的package包/类
/**
 * Generate a commitment for the passed in message.
 *
 * @param message the message to be committed to,
 * @return a Commitment
 */
public Commitment commit(byte[] message)
{
    if (message.length > byteLength / 2)
    {
        throw new DataLengthException("Message to be committed to too large for digest.");
    }

    byte[] w = new byte[byteLength - message.length];

    random.nextBytes(w);

    return new Commitment(w, calculateCommitment(w, message));
}
 

import org.bouncycastle.crypto.Commitment; //导入依赖的package包/类
/**
 * Return true if the passed in commitment represents a commitment to the passed in message.
 *
 * @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.
 */
public boolean isRevealed(Commitment commitment, byte[] message)
{
    if (message.length + commitment.getSecret().length != byteLength)
    {
        throw new DataLengthException("Message and witness secret lengths do not match.");
    }

    byte[] calcCommitment = calculateCommitment(commitment.getSecret(), message);

    return Arrays.constantTimeAreEqual(commitment.getCommitment(), calcCommitment);
}
 

import org.bouncycastle.crypto.Commitment; //导入依赖的package包/类
/**
 * 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.
 */
public boolean isRevealed(Commitment commitment, byte[] message)
{
    byte[] calcCommitment = calculateCommitment(commitment.getSecret(), message);

    return Arrays.constantTimeAreEqual(commitment.getCommitment(), calcCommitment);
}
 

import org.bouncycastle.crypto.Commitment; //导入依赖的package包/类
/**
 * Generate a commitment for a passed in index.
 *
 * @param index the index to commit to.
 * @return a hash based commitment.
 */
public Commitment commit(int index)
{
    return committer.commit(toBytes(index));
}
 

import org.bouncycastle.crypto.Commitment; //导入依赖的package包/类
/**
 * Return true if the passed in commitment is for index.
 *
 * @param commitment a hash based commitment for an index,
 * @param index the index we wish to verify against.
 * @return true if the commitment matches the index, false otherwise.
 */
public boolean isRevealed(Commitment commitment, int index)
{
    return committer.isRevealed(commitment, toBytes(index));
}