1 files changed, 0 insertions, 93 deletions
diff --git a/bcprov/src/main/java/org/bouncycastle/crypto/commitments/GeneralHashCommitter.java b/bcprov/src/main/java/org/bouncycastle/crypto/commitments/GeneralHashCommitter.java
deleted file mode 100644
index 3969fe8..0000000
--- a/bcprov/src/main/java/org/bouncycastle/crypto/commitments/GeneralHashCommitter.java
+++ /dev/null
@@ -1,93 +0,0 @@
-package org.bouncycastle.crypto.commitments;
-
-import java.security.SecureRandom;
-
-import org.bouncycastle.crypto.Commitment;
-import org.bouncycastle.crypto.Committer;
-import org.bouncycastle.crypto.DataLengthException;
-import org.bouncycastle.crypto.Digest;
-import org.bouncycastle.crypto.ExtendedDigest;
-import org.bouncycastle.util.Arrays;
-
-/**
- * A basic hash-committer based on the one described in "Making Mix Nets Robust for Electronic Voting by Randomized Partial Checking",
- * by Jakobsson, Juels, and Rivest (11th Usenix Security Symposium, 2002).
- * <p>
- * The algorithm used by this class differs from the one given in that it includes the length of the message in the hash calculation.
- * </p>
- */
-public class GeneralHashCommitter
-    implements Committer
-{
-    private final Digest digest;
-    private final int byteLength;
-    private final SecureRandom random;
-
-    /**
-     * Base Constructor. The maximum message length that can be committed to is half the length of the internal
-     * block size for the digest (ExtendedDigest.getBlockLength()).
-     *
-     * @param digest digest to use for creating commitments.
-     * @param random source of randomness for generating secrets.
-     */
-    public GeneralHashCommitter(ExtendedDigest digest, SecureRandom random)
-    {
-        this.digest = digest;
-        this.byteLength = digest.getByteLength();
-        this.random = random;
-    }
-
-    /**
-     * 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));
-    }
-
-    /**
-     * 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);
-    }
-
-    private byte[] calculateCommitment(byte[] w, byte[] message)
-    {
-        byte[] commitment = new byte[digest.getDigestSize()];
-
-        digest.update(w, 0, w.length);
-        digest.update(message, 0, message.length);
-
-        digest.update((byte)((message.length >>> 8)));
-        digest.update((byte)(message.length));
-
-        digest.doFinal(commitment, 0);
-
-        return commitment;
-    }
-}