--- old/src/java.base/share/classes/java/util/zip/ZipEntry.java	2016-02-10 23:24:07.622787999 +0900
+++ new/src/java.base/share/classes/java/util/zip/ZipEntry.java	2016-02-10 23:24:07.376788726 +0900
@@ -57,6 +57,9 @@
     int flag = 0;       // general purpose flag
     byte[] extra;       // optional extra field data for entry
     String comment;     // optional comment string for entry
+    ZipCryption zipCryption = null; // encryption / decryption engine
+    byte[] encryptionHeader; // ZIP encryption header
+    boolean passphraseValidated = false; // passphrase validation is not yet.
 
     /**
      * Compression method for uncompressed entries.
@@ -131,6 +134,8 @@
         flag = e.flag;
         extra = e.extra;
         comment = e.comment;
+        zipCryption = e.zipCryption;
+        encryptionHeader = e.encryptionHeader;
     }
 
     /**
@@ -673,4 +678,51 @@
             throw new InternalError(e);
         }
     }
+
+    /**
+     * Set passphrase for ZIP encryption and decryption.
+     * @param passphrase Passphrase for encryption and decryption.
+     */
+    public void setPassphrase(String passphrase) {
+        zipCryption = new TraditionalZipCryption(passphrase);
+    }
+
+    ZipCryption getZipCryption() {
+        return zipCryption;
+    }
+
+    /**
+     * Get the state whether encrypted entry or not.
+     * @return true if passphrase is required.
+     */
+    public boolean isPassphraseRequired() {
+        return (flag & 1) == 1;
+    }
+
+    /**
+     * Validate passphrase for this entry.
+     * @return true if passphrase is valid, or this entry is not encrypted.
+     * @throws ZipException Passphrase is not set or Encryption header is not set.
+     */
+    public boolean isValidPassphrase() throws ZipException{
+        if (!isPassphraseRequired()) {
+            return true;
+        }
+
+        if (zipCryption == null) {
+            throw new ZipException("Passphrase is not set.");
+        }
+        if (passphraseValidated) {
+            return true;
+        }
+        if (encryptionHeader == null) {
+            throw new ZipException("Encryption header is not set.");
+        }
+
+        zipCryption.reset();
+        byte[] tmp = encryptionHeader.clone();
+        zipCryption.decryptBytes(tmp);
+        passphraseValidated =  zipCryption.isValid(this, tmp);
+        return passphraseValidated;
+    }
 }