}

  /** Hasher that updates a message digest. */
  private static final class MessageDigestHasher extends AbstractByteHasher {
    private final MessageDigest digest;
    private final int bytes;
    private boolean done;

    private MessageDigestHasher(MessageDigest digest, int bytes) {
      this.digest = digest;
      this.bytes = bytes;
    }

    @Override

✋️ 🔨 👈, ⏲ ⚖️ 📆 👊 🔜 ✔️ 💭 ☑ 🆔 & 🔐, ⏮️ "ℹ" 👆 🈸, ⚙️ 🕰 ✊ ❔.

#### 🔧 ⚫️ ⏮️ `secrets.compare_digest()`

✋️ 👆 📟 👥 🤙 ⚙️ `secrets.compare_digest()`.

📏, ⚫️ 🔜 ✊ 🎏 🕰 🔬 `stanleyjobsox` `stanleyjobson` 🌘 ⚫️ ✊ 🔬 `johndoe` `stanleyjobson`. & 🎏 🔐.

👈 🌌, ⚙️ `secrets.compare_digest()` 👆 🈸 📟, ⚫️ 🔜 🔒 🛡 👉 🎂 ↔ 💂‍♂ 👊.

### 📨 ❌

#### Fix it with `secrets.compare_digest()`

But in our code we are actually using `secrets.compare_digest()`.

In short, it will take the same time to compare `stanleyjobsox` to `stanleyjobson` than it takes to compare `johndoe` to `stanleyjobson`. And the same for the password.

That way, using `secrets.compare_digest()` in your application code, it will be safe against this whole range of security attacks.

    }

    protected byte[] engineDigest() {
        byte[] digest = md5.digest();
        md5.update(opad);
        return md5.digest(digest);
    }

    protected int engineDigest(byte[] buf, int offset, int len) {
        byte[] digest = md5.digest();
        md5.update(opad);
        md5.update(digest);
        try {
            return md5.digest(buf, offset, len);
        } catch (Exception ex) {

    @Override
    protected byte[] engineDigest () {
        byte[] digest = this.md5.digest();
        this.md5.update(this.opad);
        return this.md5.digest(digest);
    }


    @Override
    protected int engineDigest ( byte[] buf, int offset, int len ) {
        byte[] digest = this.md5.digest();
        this.md5.update(this.opad);
        this.md5.update(digest);
        try {

    correct_username_bytes = b"stanleyjobson"
    is_correct_username = secrets.compare_digest(
        current_username_bytes, correct_username_bytes
    )
    current_password_bytes = credentials.password.encode("utf8")
    correct_password_bytes = b"swordfish"
    is_correct_password = secrets.compare_digest(
        current_password_bytes, correct_password_bytes
    )

        assertNull(MessageDigestUtil.digest("MD5", null));
        assertEquals("ea703e7aa1efda0064eaa507d9e8ab7e", MessageDigestUtil.digest("MD5", text));
        assertEquals("31f30ddbcb1bf8446576f0e64aa4c88a9f055e3c", MessageDigestUtil.digest("SHA-1", text));
        assertEquals("ecb666d778725ec97307044d642bf4d160aabb76f56c0069c71ea25b1e926825", MessageDigestUtil.digest("SHA-256", text));

        try {

0.35 0.0 0.0 56 32 5.37 1293 737 4 Queens 073700 4073700 I QN17 Forest Hills 4108 1856 747 4 Queens 074700 4074700 I QN17 Forest Hills 4108 3389379 2 2014-03-11 00:24:05 2014-03-11 00:28:41 N 1 -73.844093322753906 40.721103668212891 -73.850799560546875 40.735332489013672 1 0.54 4.5 0.5 0.5 1 0 6.5 1 1 95 95 green 0.00 0.0 0.0 66 45 4.70 1293 737 4 Queens 073700 4073700 I QN17 Forest Hills 4108 992 745 4 Queens 074500 4074500 E QN17 Forest Hills 4108 3389380 2 2014-03-13 10:18:41 2014-03-13 10:23:21...

                HMACT64 userKey = new HMACT64(ntlmv2Hash); 
                userKey.update(hmac.digest()); 
                userKey.digest(dest, offset, 16); 
                break; 
            default: 
                md4.update(md4.digest()); 
                md4.digest(dest, offset, 16); 
                break; 
            } 
        } catch (Exception e) {

        mac.update(seqBytes); // sequence
        mac.update(data); // data
        byte[] dgst = mac.digest();
        byte[] trunc = new byte[8];
        System.arraycopy(dgst, 0, trunc, 0, 8);

        if ( log.isDebugEnabled() ) {
            log.debug("Digest " + Hexdump.toHexString(dgst));
            log.debug("Truncated " + Hexdump.toHexString(trunc));
        }