cadi/core/src/main/java/org/onap/aaf/cadi/Symm.java

   1 /**
   2  * ============LICENSE_START====================================================
   3  * org.onap.aaf
   4  * ===========================================================================
   5  * Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.
   6  * ===========================================================================
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ============LICENSE_END====================================================
  19  *
  20  */
  21
  22 package org.onap.aaf.cadi;
  23
  24 import java.io.ByteArrayInputStream;
  25 import java.io.ByteArrayOutputStream;
  26 import java.io.DataInputStream;
  27 import java.io.DataOutputStream;
  28 import java.io.File;
  29 import java.io.FileInputStream;
  30 import java.io.IOException;
  31 import java.io.InputStream;
  32 import java.io.OutputStream;
  33 import java.security.SecureRandom;
  34 import java.util.ArrayList;
  35 import java.util.Random;
  36
  37 import javax.crypto.CipherInputStream;
  38 import javax.crypto.CipherOutputStream;
  39
  40 import org.onap.aaf.cadi.Access.Level;
  41 import org.onap.aaf.cadi.config.Config;
  42
  43 /**
  44  * Key Conversion, primarily "Base64"
  45  *
  46  * Base64 is required for "Basic Authorization", which is an important part of the overall CADI Package.
  47  *
  48  * Note: This author found that there is not a "standard" library for Base64 conversion within Java.
  49  * The source code implementations available elsewhere were surprisingly inefficient, requiring, for
  50  * instance, multiple string creation, on a transaction pass.  Integrating other packages that might be
  51  * efficient enough would put undue Jar File Dependencies given this Framework should have none-but-Java
  52  * dependencies.
  53  *
  54  * The essential algorithm is good for a symmetrical key system, as Base64 is really just
  55  * a symmetrical key that everyone knows the values.
  56  *
  57  * This code is quite fast, taking about .016 ms for encrypting, decrypting and even .08 for key
  58  * generation. The speed quality, especially of key generation makes this a candidate for a short term token
  59  * used for identity.
  60  *
  61  * It may be used to easily avoid placing Clear-Text passwords in configurations, etc. and contains
  62  * supporting functions such as 2048 keyfile generation (see keygen).  This keyfile should, of course,
  63  * be set to "400" (Unix) and protected as any other mechanism requires.
  64  *
  65  * However, this algorithm has not been tested against hackers.  Until such a time, utilize more tested
  66  * packages to protect Data, especially sensitive data at rest (long term).
  67  *
  68  * @author Jonathan
  69  *
  70  */
  71 public class Symm {
  72         private static final byte[] DOUBLE_EQ = new byte[] {'=','='};
  73         public static final String ENC = "enc:";
  74         private static final Object LOCK = new Object();
  75         private static final SecureRandom random = new SecureRandom();
  76
  77         public final char[] codeset;
  78         private final int splitLinesAt;
  79         private final String encoding;
  80         private final Convert convert;
  81         private final boolean endEquals;
  82         private byte[] keyBytes = null;
  83         //Note: AES Encryption is not Thread Safe.  It is Synchronized
  84         //private AES aes = null;  // only initialized from File, and only if needed for Passwords
  85
  86         /**
  87          * This is the standard base64 Key Set.
  88          * RFC 2045
  89          */
  90         public static final Symm base64 = new Symm(
  91                         "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray()
  92                         ,76, Config.UTF_8,true);
  93
  94         public static final Symm base64noSplit = new Symm(
  95                         "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray()
  96                         ,Integer.MAX_VALUE, Config.UTF_8,true);
  97
  98         /**
  99          * This is the standard base64 set suitable for URLs and Filenames
 100          * RFC 4648
 101          */
 102         public static final Symm base64url = new Symm(
 103                         "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_".toCharArray()
 104                         ,76, Config.UTF_8,true);
 105
 106         /**
 107          * A Password set, using US-ASCII
 108          * RFC 4648
 109          */
 110         public static final Symm encrypt = new Symm(base64url.codeset,1024, "US-ASCII", false);
 111         private static final byte[] EMPTY = new byte[0];
 112
 113         /**
 114          * A typical set of Password Chars
 115          * Note, this is too large to fit into the algorithm. Only use with PassGen
 116          */
 117         private static char passChars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+!@#$%^&*(){}[]?:;,.".toCharArray();
 118
 119
 120         private static Symm internalOnly = null;
 121
 122         /**
 123          * Use this to create special case Case Sets and/or Line breaks
 124          *
 125          * If you don't know why you need this, use the Singleton Method
 126          *
 127          * @param codeset
 128          * @param split
 129          */
 130         public Symm(char[] codeset, int split, String charset, boolean useEndEquals) {
 131                 this.codeset = codeset;
 132                 splitLinesAt = split;
 133                 encoding = charset;
 134                 endEquals = useEndEquals;
 135                 char prev = 0, curr=0, first = 0;
 136                 int offset=Integer.SIZE; // something that's out of range for integer array
 137
 138                 // There can be time efficiencies gained when the underlying keyset consists mainly of ordered
 139                 // data (i.e. abcde...).  Therefore, we'll quickly analyze the keyset.  If it proves to have
 140                 // too much entropy, the "Unordered" algorithm, which is faster in such cases is used.
 141                 ArrayList<int[]> la = new ArrayList<>();
 142                 for(int i=0;i<codeset.length;++i) {
 143                         curr = codeset[i];
 144                         if(prev+1==curr) { // is next character in set
 145                                 prev = curr;
 146                         } else {
 147                                 if(offset!=Integer.SIZE) { // add previous range
 148                                         la.add(new int[]{first,prev,offset});
 149                                 }
 150                                 first = prev = curr;
 151                                 offset = curr-i;
 152                         }
 153                 }
 154                 la.add(new int[]{first,curr,offset});
 155                 if(la.size()>codeset.length/3) {
 156                         convert = new Unordered(codeset);
 157                 } else { // too random to get speed enhancement from range algorithm
 158                         int[][] range = new int[la.size()][];
 159                         la.toArray(range);
 160                         convert = new Ordered(range);
 161                 }
 162         }
 163
 164         public Symm copy(int lines) {
 165                 return new Symm(codeset,lines,encoding,endEquals);
 166         }
 167
 168         // Only used by keygen, which is intentionally randomized. Therefore, always use unordered
 169         private  Symm(char[] codeset, Symm parent) {
 170                 this.codeset = codeset;
 171                 splitLinesAt = parent.splitLinesAt;
 172                 endEquals = parent.endEquals;
 173                 encoding = parent.encoding;
 174                 convert = new Unordered(codeset);
 175         }
 176
 177         /**
 178          * Obtain the base64() behavior of this class, for use in standard BASIC AUTH mechanism, etc.
 179          * @return
 180          */
 181         @Deprecated
 182         public static final Symm base64() {
 183                 return base64;
 184         }
 185
 186         /**
 187          * Obtain the base64() behavior of this class, for use in standard BASIC AUTH mechanism, etc.
 188          * No Line Splitting
 189          * @return
 190          */
 191         @Deprecated
 192         public static final Symm base64noSplit() {
 193                 return base64noSplit;
 194         }
 195
 196         /**
 197          * Obtain the base64 "URL" behavior of this class, for use in File Names, etc. (no "/")
 198          */
 199         @Deprecated
 200         public static final Symm base64url() {
 201                 return base64url;
 202         }
 203
 204         /**
 205          * Obtain a special ASCII version for Scripting, with base set of base64url use in File Names, etc. (no "/")
 206          */
 207         public static final Symm baseCrypt() {
 208                 return encrypt;
 209         }
 210
 211         public <T> T exec(SyncExec<T> exec) throws Exception {
 212                 synchronized(LOCK) {
 213                         if(keyBytes == null) {
 214                                 keyBytes = new byte[AES.AES_KEY_SIZE/8];
 215                                 int offset = (Math.abs(codeset[0])+47)%(codeset.length-keyBytes.length);
 216                                 for(int i=0;i<keyBytes.length;++i) {
 217                                         keyBytes[i] = (byte)codeset[i+offset];
 218                                 }
 219                         }
 220                 }
 221                 return exec.exec(new AES(keyBytes,0,keyBytes.length));
 222         }
 223
 224         public interface Encryption {
 225                 public CipherOutputStream outputStream(OutputStream os, boolean encrypt);
 226                 public CipherInputStream inputStream(InputStream is, boolean encrypt);
 227         }
 228
 229         public static interface SyncExec<T> {
 230                 public T exec(Encryption enc) throws IOException, Exception;
 231         }
 232
 233     public byte[] encode(byte[] toEncrypt) throws IOException {
 234                 if(toEncrypt==null) {
 235                         return EMPTY;
 236                 } else {
 237                         ByteArrayOutputStream baos = new ByteArrayOutputStream((int)(toEncrypt.length*1.25));
 238                         encode(new ByteArrayInputStream(toEncrypt),baos);
 239                         return baos.toByteArray();
 240                 }
 241         }
 242
 243     public byte[] decode(byte[] encrypted) throws IOException {
 244                 ByteArrayOutputStream baos = new ByteArrayOutputStream((int)(encrypted.length*1.25));
 245                 decode(new ByteArrayInputStream(encrypted),baos);
 246                 return baos.toByteArray();
 247         }
 248
 249         /**
 250      *  Helper function for String API of "Encode"
 251      *  use "getBytes" with appropriate char encoding, etc.
 252      *
 253      * @param str
 254      * @return
 255      * @throws IOException
 256      */
 257     public String encode(String str) throws IOException {
 258         byte[] array;
 259                 boolean useDefaultEncoding = false;
 260         try {
 261                 array = str.getBytes(encoding);
 262         } catch (IOException e) {
 263                 array = str.getBytes(); // take default
 264                         useDefaultEncoding = true;
 265         }
 266         // Calculate expected size to avoid any buffer expansion copies within the ByteArrayOutput code
 267         ByteArrayOutputStream baos = new ByteArrayOutputStream((int)(array.length*1.363)); // account for 4 bytes for 3 and a byte or two more
 268
 269         encode(new ByteArrayInputStream(array),baos);
 270                 if (useDefaultEncoding) {
 271                         return baos.toString();
 272                 }
 273                 return baos.toString(encoding);
 274     }
 275
 276     /**
 277      * Helper function for the String API of "Decode"
 278      * use "getBytes" with appropriate char encoding, etc.
 279      * @param str
 280      * @return
 281      * @throws IOException
 282      */
 283     public String decode(String str) throws IOException {
 284         byte[] array;
 285                 boolean useDefaultEncoding = false;
 286         try {
 287                 array = str.getBytes(encoding);
 288         } catch (IOException e) {
 289                 array = str.getBytes(); // take default
 290                         useDefaultEncoding = true;
 291         }
 292         // Calculate expected size to avoid any buffer expansion copies within the ByteArrayOutput code
 293         ByteArrayOutputStream baos = new ByteArrayOutputStream((int)(array.length*.76)); // Decoding is 3 bytes for 4.  Allocate slightly more than 3/4s
 294         decode(new ByteArrayInputStream(array), baos);
 295                 if (useDefaultEncoding) {
 296                         return baos.toString();
 297                 }
 298         return baos.toString(encoding);
 299         }
 300
 301         /**
 302      * Convenience Function
 303      *
 304      * encode String into InputStream and call encode(InputStream, OutputStream)
 305      *
 306      * @param string
 307      * @param out
 308      * @throws IOException
 309      */
 310         public void encode(String string, OutputStream out) throws IOException {
 311                 encode(new ByteArrayInputStream(string.getBytes()),out);
 312         }
 313
 314         /**
 315          * Convenience Function
 316          *
 317          * encode String into InputStream and call decode(InputStream, OutputStream)
 318          *
 319          * @param string
 320          * @param out
 321          * @throws IOException
 322          */
 323         public void decode(String string, OutputStream out) throws IOException {
 324                 decode(new ByteArrayInputStream(string.getBytes()),out);
 325         }
 326
 327     public void encode(InputStream is, OutputStream os, byte[] prefix) throws IOException {
 328         os.write(prefix);
 329         encode(is,os);
 330     }
 331
 332         /**
 333      * encode InputStream onto Output Stream
 334      *
 335      * @param is
 336      * @param estimate
 337      * @return
 338      * @throws IOException
 339      */
 340     public void encode(InputStream is, OutputStream os) throws IOException {
 341         // StringBuilder sb = new StringBuilder((int)(estimate*1.255)); // try to get the right size of StringBuilder from start.. slightly more than 1.25 times
 342         int prev=0;
 343         int read, idx=0, line=0;
 344         boolean go;
 345         do {
 346                 read = is.read();
 347                 if(go = read>=0) {
 348                         if(line>=splitLinesAt) {
 349                                 os.write('\n');
 350                                 line = 0;
 351                         }
 352                         switch(++idx) { // 1 based reading, slightly faster ++
 353                                 case 1: // ptr is the first 6 bits of read
 354                                         os.write(codeset[read>>2]);
 355                                         prev = read;
 356                                         break;
 357                                 case 2: // ptr is the last 2 bits of prev followed by the first 4 bits of read
 358                                         os.write(codeset[((prev & 0x03)<<4) | (read>>4)]);
 359                                         prev = read;
 360                                         break;
 361                                 default: //(3+)
 362                                                 // Char 1 is last 4 bits of prev plus the first 2 bits of read
 363                                             // Char 2 is the last 6 bits of read
 364                                         os.write(codeset[(((prev & 0xF)<<2) | (read>>6))]);
 365                                         if(line==splitLinesAt) { // deal with line splitting for two characters
 366                                                 os.write('\n');
 367                                                 line=0;
 368                                         }
 369                                         os.write(codeset[(read & 0x3F)]);
 370                                         ++line;
 371                                         idx = 0;
 372                                         prev = 0;
 373                         }
 374                         ++line;
 375                 } else { // deal with any remaining bits from Prev, then pad
 376                         switch(idx) {
 377                                 case 1: // just the last 2 bits of prev
 378                                         os.write(codeset[(prev & 0x03)<<4]);
 379                                         if(endEquals)os.write(DOUBLE_EQ);
 380                                         break;
 381                                 case 2: // just the last 4 bits of prev
 382                                         os.write(codeset[(prev & 0xF)<<2]);
 383                                         if(endEquals)os.write('=');
 384                                         break;
 385                         }
 386                         idx = 0;
 387                 }
 388
 389         } while(go);
 390     }
 391
 392     public void decode(InputStream is, OutputStream os, int skip) throws IOException {
 393         if(is.skip(skip)!=skip) {
 394                 throw new IOException("Error skipping on IOStream in Symm");
 395         }
 396         decode(is,os);
 397     }
 398
 399     /**
 400          * Decode InputStream onto OutputStream
 401          * @param is
 402          * @param os
 403          * @throws IOException
 404          */
 405     public void decode(InputStream is, OutputStream os) throws IOException {
 406            int read, idx=0;
 407            int prev=0, index;
 408                 while((read = is.read())>=0) {
 409                         index = convert.convert(read);
 410                         if(index>=0) {
 411                         switch(++idx) { // 1 based cases, slightly faster ++
 412                                 case 1: // index goes into first 6 bits of prev
 413                                         prev = index<<2;
 414                                         break;
 415                                 case 2: // write second 2 bits of into prev, write byte, last 4 bits go into prev
 416                                         os.write((byte)(prev|(index>>4)));
 417                                         prev = index<<4;
 418                                         break;
 419                                 case 3: // first 4 bits of index goes into prev, write byte, last 2 bits go into prev
 420                                         os.write((byte)(prev|(index>>2)));
 421                                         prev = index<<6;
 422                                         break;
 423                                 default: // (3+) | prev and last six of index
 424                                         os.write((byte)(prev|(index&0x3F)));
 425                                         idx = prev = 0;
 426                         }
 427                         }
 428                 };
 429                 os.flush();
 430    }
 431
 432    /**
 433     * Interface to allow this class to choose which algorithm to find index of character in Key
 434     * @author Jonathan
 435     *
 436     */
 437    private interface Convert {
 438            public int convert(int read) throws IOException;
 439    }
 440
 441    /**
 442     * Ordered uses a range of orders to compare against, rather than requiring the investigation
 443     * of every character needed.
 444     * @author Jonathan
 445     *
 446     */
 447    private static final class Ordered implements Convert {
 448            private int[][] range;
 449            public Ordered(int[][] range) {
 450                    this.range = range;
 451            }
 452            public int convert(int read) throws IOException {
 453                    // System.out.print((char)read);
 454                    switch(read) {
 455                            case -1:
 456                            case '=':
 457                            case ' ':
 458                            case '\n':
 459                            case '\r':
 460                                    return -1;
 461                    }
 462                    for(int i=0;i<range.length;++i) {
 463                            if(read >= range[i][0] && read<=range[i][1]) {
 464                                    return read-range[i][2];
 465                            }
 466                    }
 467                    throw new IOException("Unacceptable Character in Stream");
 468            }
 469    }
 470
 471    /**
 472     * Unordered, i.e. the key is purposely randomized, simply has to investigate each character
 473     * until we find a match.
 474     * @author Jonathan
 475     *
 476     */
 477    private static final class Unordered implements Convert {
 478            private char[] codec;
 479            public Unordered(char[] codec) {
 480                    this.codec = codec;
 481            }
 482            public int convert(int read) throws IOException {
 483                    switch(read) {
 484                            case -1:
 485                            case '=':
 486                                  case '\n':
 487                                  case '\r':
 488                                    return -1;
 489                    }
 490                    for(int i=0;i<codec.length;++i) {
 491                            if(codec[i]==read)return i;
 492                    }
 493                   // don't give clue in Encryption mode
 494                   throw new IOException("Unacceptable Character in Stream");
 495            }
 496    }
 497
 498    /**
 499     * Generate a 2048 based Key from which we extract our code base
 500     *
 501     * @return
 502     * @throws IOException
 503     */
 504    public static byte[] keygen() throws IOException {
 505                 byte inkey[] = new byte[0x600];
 506                 new SecureRandom().nextBytes(inkey);
 507                 ByteArrayOutputStream baos = new ByteArrayOutputStream(0x800);
 508                 base64url.encode(new ByteArrayInputStream(inkey), baos);
 509                 return baos.toByteArray();
 510    }
 511
 512    // A class allowing us to be less predictable about significant digits (i.e. not picking them up from the
 513    // beginning, and not picking them up in an ordered row.  Gives a nice 2048 with no visible patterns.
 514    private class Obtain {
 515            private int last;
 516            private int skip;
 517            private int length;
 518            private byte[] key;
 519
 520            private Obtain(Symm b64, byte[] key) {
 521                    skip = Math.abs(key[key.length-13]%key.length);
 522                    if((key.length&0x1) == (skip&0x1)) { // if both are odd or both are even
 523                            ++skip;
 524                    }
 525                    length = b64.codeset.length;
 526                    last = 17+length%59; // never start at beginning
 527                    this.key = key;
 528            }
 529
 530            private int next() {
 531                    return Math.abs(key[(++last*skip)%key.length])%length;
 532            }
 533    };
 534
 535    /**
 536     * Obtain a Symm from "keyfile" (Config.KEYFILE) property
 537     *
 538     * @param acesss
 539     * @return
 540  * @throws IOException
 541  * @throws CadiException
 542     */
 543    public static Symm obtain(Access access) throws CadiException {
 544                 String keyfile = access.getProperty(Config.CADI_KEYFILE,null);
 545                 if(keyfile!=null) {
 546                         Symm symm = Symm.baseCrypt();
 547
 548                         File file = new File(keyfile);
 549                         try {
 550                                 access.log(Level.INIT, Config.CADI_KEYFILE,"points to",file.getCanonicalPath());
 551                         } catch (IOException e1) {
 552                                 access.log(Level.INIT, Config.CADI_KEYFILE,"points to",file.getAbsolutePath());
 553                         }
 554                         if(file.exists()) {
 555                                 try {
 556                                         FileInputStream fis = new FileInputStream(file);
 557                                         try {
 558                                                 symm = Symm.obtain(fis);
 559                                         } finally {
 560                                                 try {
 561                                                    fis.close();
 562                                                 } catch (IOException e) {
 563                                                 }
 564                                         }
 565                                 } catch (IOException e) {
 566                                         access.log(e, "Cannot load keyfile");
 567                                 }
 568                         } else {
 569                                 String filename;
 570                                 try {
 571                                         filename = file.getCanonicalPath();
 572                                 } catch (IOException e) {
 573                                         filename = file.getAbsolutePath();
 574                                 }
 575                                 throw new CadiException("ERROR: " + filename + " does not exist!");
 576                         }
 577                         return symm;
 578                 } else {
 579                         try {
 580                                 return internalOnly();
 581                         } catch (IOException e) {
 582                                 throw new CadiException(e);
 583                         }
 584                 }
 585    }
 586   /**
 587    *  Create a new random key
 588    */
 589   public Symm obtain() throws IOException {
 590                 byte inkey[] = new byte[0x800];
 591                 new SecureRandom().nextBytes(inkey);
 592                 return obtain(inkey);
 593   }
 594
 595   /**
 596    * Obtain a Symm from 2048 key from a String
 597    *
 598    * @param key
 599    * @return
 600    * @throws IOException
 601    */
 602   public static Symm obtain(String key) throws IOException {
 603           return obtain(new ByteArrayInputStream(key.getBytes()));
 604   }
 605
 606   /**
 607    * Obtain a Symm from 2048 key from a Stream
 608    *
 609    * @param is
 610    * @return
 611    * @throws IOException
 612    */
 613   public static Symm obtain(InputStream is) throws IOException {
 614           ByteArrayOutputStream baos = new ByteArrayOutputStream();
 615           try {
 616                   base64url.decode(is, baos);
 617           } catch (IOException e) {
 618                   // don't give clue
 619                   throw new IOException("Invalid Key");
 620           }
 621           byte[] bkey = baos.toByteArray();
 622           if(bkey.length<0x88) { // 2048 bit key
 623                   throw new IOException("Invalid key");
 624           }
 625           return baseCrypt().obtain(bkey);
 626   }
 627
 628   /**
 629    * Convenience for picking up Keyfile
 630    *
 631    * @param f
 632    * @return
 633    * @throws IOException
 634    */
 635   public static Symm obtain(File f) throws IOException {
 636           FileInputStream fis = new FileInputStream(f);
 637           try {
 638                   return obtain(fis);
 639           } finally {
 640                   fis.close();
 641           }
 642   }
 643   /**
 644    * Decrypt into a String
 645    *
 646    *  Convenience method
 647    *
 648    * @param password
 649    * @return
 650    * @throws IOException
 651    */
 652   public String enpass(String password) throws IOException {
 653           ByteArrayOutputStream baos = new ByteArrayOutputStream();
 654           enpass(password,baos);
 655           return new String(baos.toByteArray());
 656   }
 657
 658   /**
 659    * Create an encrypted password, making sure that even short passwords have a minimum length.
 660    *
 661    * @param password
 662    * @param os
 663    * @throws IOException
 664    */
 665   public void enpass(final String password, final OutputStream os) throws IOException {
 666             if(password==null) {
 667                 throw new IOException("Invalid password passed");
 668             }
 669                 final ByteArrayOutputStream baos = new ByteArrayOutputStream();
 670                 DataOutputStream dos = new DataOutputStream(baos);
 671                 byte[] bytes = password.getBytes();
 672                 if(this.getClass().getSimpleName().startsWith("base64")) { // don't expose randomization
 673                         dos.write(bytes);
 674                 } else {
 675
 676                         Random r = new SecureRandom();
 677                         int start = 0;
 678                         byte b;
 679                         for(int i=0;i<3;++i) {
 680                                 dos.writeByte(b=(byte)r.nextInt());
 681                                 start+=Math.abs(b);
 682                         }
 683                         start%=0x7;
 684                         for(int i=0;i<start;++i) {
 685                                 dos.writeByte(r.nextInt());
 686                         }
 687                         dos.writeInt((int)System.currentTimeMillis());
 688                         int minlength = Math.min(0x9,bytes.length);
 689                         dos.writeByte(minlength); // expect truncation
 690                         if(bytes.length<0x9) {
 691                                 for(int i=0;i<bytes.length;++i) {
 692                                         dos.writeByte(r.nextInt());
 693                                         dos.writeByte(bytes[i]);
 694                                 }
 695                                 // make sure it's long enough
 696                                 for(int i=bytes.length;i<0x9;++i) {
 697                                         dos.writeByte(r.nextInt());
 698                                 }
 699                         } else {
 700                                 dos.write(bytes);
 701                         }
 702                 }
 703
 704                 // 7/21/2016 Jonathan add AES Encryption to the mix
 705                 try {
 706                         exec(new SyncExec<Void>() {
 707                                 @Override
 708                                 public Void exec(Encryption enc) throws Exception {
 709                                         CipherInputStream cis = enc.inputStream(new ByteArrayInputStream(baos.toByteArray()), true);
 710                                         try {
 711                                                 encode(cis,os);
 712                                         } finally {
 713                                                 os.flush();
 714                                                 cis.close();
 715                                         }
 716                                         return null;
 717                                 }
 718                         });
 719                 } catch (IOException e) {
 720                         throw e;
 721                 } catch (Exception e) {
 722                         throw new IOException(e);
 723                 }
 724         }
 725
 726   /**
 727    * Decrypt a password into a String
 728    *
 729    * Convenience method
 730    *
 731    * @param password
 732    * @return
 733    * @throws IOException
 734    */
 735   public String depass(String password) throws IOException {
 736           if(password==null)return null;
 737           ByteArrayOutputStream baos = new ByteArrayOutputStream();
 738           depass(password,baos);
 739           return new String(baos.toByteArray());
 740   }
 741
 742   /**
 743    * Decrypt a password
 744    *
 745    * Skip Symm.ENC
 746    *
 747    * @param password
 748    * @param os
 749    * @return
 750    * @throws IOException
 751    */
 752   public long depass(final String password, final OutputStream os) throws IOException {
 753           int offset = password.startsWith(ENC)?4:0;
 754           final ByteArrayOutputStream baos = new ByteArrayOutputStream();
 755           final ByteArrayInputStream bais =  new ByteArrayInputStream(password.getBytes(),offset,password.length()-offset);
 756           try {
 757                 exec(new SyncExec<Void>() {
 758                         @Override
 759                         public Void exec(Encryption enc) throws IOException {
 760                                   CipherOutputStream cos = enc.outputStream(baos, false);
 761                                   decode(bais,cos);
 762                                   cos.close(); // flush
 763                                   return null;
 764                         }
 765                   });
 766                 } catch (IOException e) {
 767                         throw e;
 768                 } catch (Exception e) {
 769                         throw new IOException(e);
 770                 }
 771
 772           byte[] bytes = baos.toByteArray();
 773           DataInputStream dis = new DataInputStream(new ByteArrayInputStream(bytes));
 774           long time;
 775           if(this.getClass().getSimpleName().startsWith("base64")) { // don't expose randomization
 776                   os.write(bytes);
 777                   time = 0L;
 778           } else {
 779                   int start=0;
 780                   for(int i=0;i<3;++i) {
 781                           start+=Math.abs(dis.readByte());
 782                   }
 783                   start%=0x7;
 784                   for(int i=0;i<start;++i) {
 785                           dis.readByte();
 786                   }
 787                   time = (dis.readInt() & 0xFFFF)|(System.currentTimeMillis()&0xFFFF0000);
 788                   int minlength = dis.readByte();
 789                   if(minlength<0x9){
 790                         DataOutputStream dos = new DataOutputStream(os);
 791                         for(int i=0;i<minlength;++i) {
 792                                 dis.readByte();
 793                                 dos.writeByte(dis.readByte());
 794                         }
 795                   } else {
 796                           int pre =((Byte.SIZE*3+Integer.SIZE+Byte.SIZE)/Byte.SIZE)+start;
 797                           os.write(bytes, pre, bytes.length-pre);
 798                   }
 799           }
 800           return time;
 801   }
 802
 803   public static String randomGen(int numBytes) {
 804           return randomGen(passChars,numBytes);
 805   }
 806
 807   public static String randomGen(char[] chars ,int numBytes) {
 808             int rint;
 809             StringBuilder sb = new StringBuilder(numBytes);
 810             for(int i=0;i<numBytes;++i) {
 811                 rint = random.nextInt(chars.length);
 812                 sb.append(chars[rint]);
 813             }
 814             return sb.toString();
 815   }
 816   // Internal mechanism for helping to randomize placement of characters within a Symm codeset
 817   // Based on an incoming data stream (originally created randomly, but can be recreated within
 818   // 2048 key), go after a particular place in the new codeset.  If that codeset spot is used, then move
 819   // right or left (depending on iteration) to find the next available slot.  In this way, key generation
 820   // is speeded up by only enacting N iterations, but adds a spreading effect of the random number stream, so that keyset is also
 821   // shuffled for a good spread. It is, however, repeatable, given the same number set, allowing for
 822   // quick recreation when the official stream is actually obtained.
 823   public Symm obtain(byte[] key) throws IOException {
 824           int filled = codeset.length;
 825           char[] seq = new char[filled];
 826           int end = filled--;
 827
 828           boolean right = true;
 829           int index;
 830           Obtain o = new Obtain(this,key);
 831
 832           while(filled>=0) {
 833                   index = o.next();
 834                   if(index<0 || index>=codeset.length) {
 835                           System.out.println("uh, oh");
 836                   }
 837                   if(right) { // alternate going left or right to find the next open slot (keeps it from taking too long to hit something)
 838                           for(int j=index;j<end;++j) {
 839                                   if(seq[j]==0) {
 840                                           seq[j]=codeset[filled];
 841                                           --filled;
 842                                           break;
 843                                   }
 844                           }
 845                           right = false;
 846                   } else {
 847                           for(int j=index;j>=0;--j) {
 848                                   if(seq[j]==0) {
 849                                           seq[j]=codeset[filled];
 850                                           --filled;
 851                                           break;
 852                                   }
 853                           }
 854                           right = true;
 855                   }
 856           }
 857           Symm newSymm = new Symm(seq,this);
 858           // Set the KeyBytes
 859           try {
 860                   newSymm.keyBytes = new byte[AES.AES_KEY_SIZE/8];
 861                   int offset = (Math.abs(key[(47%key.length)])+137)%(key.length-newSymm.keyBytes.length);
 862                   for(int i=0;i<newSymm.keyBytes.length;++i) {
 863                           newSymm.keyBytes[i] = key[i+offset];
 864                   }
 865           } catch (Exception e) {
 866                   throw new IOException(e);
 867           }
 868
 869           return newSymm;
 870   }
 871
 872   /**
 873    * This Symm is generated for internal JVM use.  It has no external keyfile, but can be used
 874    * for securing Memory, as it remains the same ONLY of the current JVM
 875    * @return
 876  * @throws IOException
 877    */
 878   public static synchronized Symm internalOnly() throws IOException {
 879           if(internalOnly==null) {
 880                   ByteArrayInputStream baos = new ByteArrayInputStream(keygen());
 881                   try {
 882                           internalOnly = Symm.obtain(baos);
 883                   } finally {
 884                           baos.close();
 885                   }
 886           }
 887           return internalOnly;
 888   }
 889 }