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/wp-includes/sodium_compat/src/Core32/ -> ChaCha20.php (source)

   1  <?php
   2  
   3  if (class_exists('ParagonIE_Sodium_Core32_ChaCha20', false)) {
   4      return;
   5  }
   6  
   7  /**
   8   * Class ParagonIE_Sodium_Core32_ChaCha20
   9   */
  10  class ParagonIE_Sodium_Core32_ChaCha20 extends ParagonIE_Sodium_Core32_Util
  11  {
  12      /**
  13       * The ChaCha20 quarter round function. Works on four 32-bit integers.
  14       *
  15       * @internal You should not use this directly from another application
  16       *
  17       * @param ParagonIE_Sodium_Core32_Int32 $a
  18       * @param ParagonIE_Sodium_Core32_Int32 $b
  19       * @param ParagonIE_Sodium_Core32_Int32 $c
  20       * @param ParagonIE_Sodium_Core32_Int32 $d
  21       * @return array<int, ParagonIE_Sodium_Core32_Int32>
  22       * @throws SodiumException
  23       * @throws TypeError
  24       */
  25      protected static function quarterRound(
  26          ParagonIE_Sodium_Core32_Int32 $a,
  27          ParagonIE_Sodium_Core32_Int32 $b,
  28          ParagonIE_Sodium_Core32_Int32 $c,
  29          ParagonIE_Sodium_Core32_Int32 $d
  30      ) {
  31          /** @var ParagonIE_Sodium_Core32_Int32 $a */
  32          /** @var ParagonIE_Sodium_Core32_Int32 $b */
  33          /** @var ParagonIE_Sodium_Core32_Int32 $c */
  34          /** @var ParagonIE_Sodium_Core32_Int32 $d */
  35  
  36          # a = PLUS(a,b); d = ROTATE(XOR(d,a),16);
  37          $a = $a->addInt32($b);
  38          $d = $d->xorInt32($a)->rotateLeft(16);
  39  
  40          # c = PLUS(c,d); b = ROTATE(XOR(b,c),12);
  41          $c = $c->addInt32($d);
  42          $b = $b->xorInt32($c)->rotateLeft(12);
  43  
  44          # a = PLUS(a,b); d = ROTATE(XOR(d,a), 8);
  45          $a = $a->addInt32($b);
  46          $d = $d->xorInt32($a)->rotateLeft(8);
  47  
  48          # c = PLUS(c,d); b = ROTATE(XOR(b,c), 7);
  49          $c = $c->addInt32($d);
  50          $b = $b->xorInt32($c)->rotateLeft(7);
  51  
  52          return array($a, $b, $c, $d);
  53      }
  54  
  55      /**
  56       * @internal You should not use this directly from another application
  57       *
  58       * @param ParagonIE_Sodium_Core32_ChaCha20_Ctx $ctx
  59       * @param string $message
  60       *
  61       * @return string
  62       * @throws SodiumException
  63       * @throws TypeError
  64       */
  65      public static function encryptBytes(
  66          ParagonIE_Sodium_Core32_ChaCha20_Ctx $ctx,
  67          $message = ''
  68      ) {
  69          $bytes = self::strlen($message);
  70  
  71          /** @var ParagonIE_Sodium_Core32_Int32 $x0 */
  72          /** @var ParagonIE_Sodium_Core32_Int32 $x1 */
  73          /** @var ParagonIE_Sodium_Core32_Int32 $x2 */
  74          /** @var ParagonIE_Sodium_Core32_Int32 $x3 */
  75          /** @var ParagonIE_Sodium_Core32_Int32 $x4 */
  76          /** @var ParagonIE_Sodium_Core32_Int32 $x5 */
  77          /** @var ParagonIE_Sodium_Core32_Int32 $x6 */
  78          /** @var ParagonIE_Sodium_Core32_Int32 $x7 */
  79          /** @var ParagonIE_Sodium_Core32_Int32 $x8 */
  80          /** @var ParagonIE_Sodium_Core32_Int32 $x9 */
  81          /** @var ParagonIE_Sodium_Core32_Int32 $x10 */
  82          /** @var ParagonIE_Sodium_Core32_Int32 $x11 */
  83          /** @var ParagonIE_Sodium_Core32_Int32 $x12 */
  84          /** @var ParagonIE_Sodium_Core32_Int32 $x13 */
  85          /** @var ParagonIE_Sodium_Core32_Int32 $x14 */
  86          /** @var ParagonIE_Sodium_Core32_Int32 $x15 */
  87  
  88          /*
  89          j0 = ctx->input[0];
  90          j1 = ctx->input[1];
  91          j2 = ctx->input[2];
  92          j3 = ctx->input[3];
  93          j4 = ctx->input[4];
  94          j5 = ctx->input[5];
  95          j6 = ctx->input[6];
  96          j7 = ctx->input[7];
  97          j8 = ctx->input[8];
  98          j9 = ctx->input[9];
  99          j10 = ctx->input[10];
 100          j11 = ctx->input[11];
 101          j12 = ctx->input[12];
 102          j13 = ctx->input[13];
 103          j14 = ctx->input[14];
 104          j15 = ctx->input[15];
 105          */
 106          /** @var ParagonIE_Sodium_Core32_Int32 $j0 */
 107          $j0  = $ctx[0];
 108          /** @var ParagonIE_Sodium_Core32_Int32 $j1 */
 109          $j1  = $ctx[1];
 110          /** @var ParagonIE_Sodium_Core32_Int32 $j2 */
 111          $j2  = $ctx[2];
 112          /** @var ParagonIE_Sodium_Core32_Int32 $j3 */
 113          $j3  = $ctx[3];
 114          /** @var ParagonIE_Sodium_Core32_Int32 $j4 */
 115          $j4  = $ctx[4];
 116          /** @var ParagonIE_Sodium_Core32_Int32 $j5 */
 117          $j5  = $ctx[5];
 118          /** @var ParagonIE_Sodium_Core32_Int32 $j6 */
 119          $j6  = $ctx[6];
 120          /** @var ParagonIE_Sodium_Core32_Int32 $j7 */
 121          $j7  = $ctx[7];
 122          /** @var ParagonIE_Sodium_Core32_Int32 $j8 */
 123          $j8  = $ctx[8];
 124          /** @var ParagonIE_Sodium_Core32_Int32 $j9 */
 125          $j9  = $ctx[9];
 126          /** @var ParagonIE_Sodium_Core32_Int32 $j10 */
 127          $j10 = $ctx[10];
 128          /** @var ParagonIE_Sodium_Core32_Int32 $j11 */
 129          $j11 = $ctx[11];
 130          /** @var ParagonIE_Sodium_Core32_Int32 $j12 */
 131          $j12 = $ctx[12];
 132          /** @var ParagonIE_Sodium_Core32_Int32 $j13 */
 133          $j13 = $ctx[13];
 134          /** @var ParagonIE_Sodium_Core32_Int32 $j14 */
 135          $j14 = $ctx[14];
 136          /** @var ParagonIE_Sodium_Core32_Int32 $j15 */
 137          $j15 = $ctx[15];
 138  
 139          $c = '';
 140          for (;;) {
 141              if ($bytes < 64) {
 142                  $message .= str_repeat("\x00", 64 - $bytes);
 143              }
 144  
 145              $x0 =  clone $j0;
 146              $x1 =  clone $j1;
 147              $x2 =  clone $j2;
 148              $x3 =  clone $j3;
 149              $x4 =  clone $j4;
 150              $x5 =  clone $j5;
 151              $x6 =  clone $j6;
 152              $x7 =  clone $j7;
 153              $x8 =  clone $j8;
 154              $x9 =  clone $j9;
 155              $x10 = clone $j10;
 156              $x11 = clone $j11;
 157              $x12 = clone $j12;
 158              $x13 = clone $j13;
 159              $x14 = clone $j14;
 160              $x15 = clone $j15;
 161  
 162              # for (i = 20; i > 0; i -= 2) {
 163              for ($i = 20; $i > 0; $i -= 2) {
 164                  # QUARTERROUND( x0,  x4,  x8,  x12)
 165                  list($x0, $x4, $x8, $x12) = self::quarterRound($x0, $x4, $x8, $x12);
 166  
 167                  # QUARTERROUND( x1,  x5,  x9,  x13)
 168                  list($x1, $x5, $x9, $x13) = self::quarterRound($x1, $x5, $x9, $x13);
 169  
 170                  # QUARTERROUND( x2,  x6,  x10,  x14)
 171                  list($x2, $x6, $x10, $x14) = self::quarterRound($x2, $x6, $x10, $x14);
 172  
 173                  # QUARTERROUND( x3,  x7,  x11,  x15)
 174                  list($x3, $x7, $x11, $x15) = self::quarterRound($x3, $x7, $x11, $x15);
 175  
 176                  # QUARTERROUND( x0,  x5,  x10,  x15)
 177                  list($x0, $x5, $x10, $x15) = self::quarterRound($x0, $x5, $x10, $x15);
 178  
 179                  # QUARTERROUND( x1,  x6,  x11,  x12)
 180                  list($x1, $x6, $x11, $x12) = self::quarterRound($x1, $x6, $x11, $x12);
 181  
 182                  # QUARTERROUND( x2,  x7,  x8,  x13)
 183                  list($x2, $x7, $x8, $x13) = self::quarterRound($x2, $x7, $x8, $x13);
 184  
 185                  # QUARTERROUND( x3,  x4,  x9,  x14)
 186                  list($x3, $x4, $x9, $x14) = self::quarterRound($x3, $x4, $x9, $x14);
 187              }
 188              /*
 189              x0 = PLUS(x0, j0);
 190              x1 = PLUS(x1, j1);
 191              x2 = PLUS(x2, j2);
 192              x3 = PLUS(x3, j3);
 193              x4 = PLUS(x4, j4);
 194              x5 = PLUS(x5, j5);
 195              x6 = PLUS(x6, j6);
 196              x7 = PLUS(x7, j7);
 197              x8 = PLUS(x8, j8);
 198              x9 = PLUS(x9, j9);
 199              x10 = PLUS(x10, j10);
 200              x11 = PLUS(x11, j11);
 201              x12 = PLUS(x12, j12);
 202              x13 = PLUS(x13, j13);
 203              x14 = PLUS(x14, j14);
 204              x15 = PLUS(x15, j15);
 205              */
 206              $x0 = $x0->addInt32($j0);
 207              $x1 = $x1->addInt32($j1);
 208              $x2 = $x2->addInt32($j2);
 209              $x3 = $x3->addInt32($j3);
 210              $x4 = $x4->addInt32($j4);
 211              $x5 = $x5->addInt32($j5);
 212              $x6 = $x6->addInt32($j6);
 213              $x7 = $x7->addInt32($j7);
 214              $x8 = $x8->addInt32($j8);
 215              $x9 = $x9->addInt32($j9);
 216              $x10 = $x10->addInt32($j10);
 217              $x11 = $x11->addInt32($j11);
 218              $x12 = $x12->addInt32($j12);
 219              $x13 = $x13->addInt32($j13);
 220              $x14 = $x14->addInt32($j14);
 221              $x15 = $x15->addInt32($j15);
 222  
 223              /*
 224              x0 = XOR(x0, LOAD32_LE(m + 0));
 225              x1 = XOR(x1, LOAD32_LE(m + 4));
 226              x2 = XOR(x2, LOAD32_LE(m + 8));
 227              x3 = XOR(x3, LOAD32_LE(m + 12));
 228              x4 = XOR(x4, LOAD32_LE(m + 16));
 229              x5 = XOR(x5, LOAD32_LE(m + 20));
 230              x6 = XOR(x6, LOAD32_LE(m + 24));
 231              x7 = XOR(x7, LOAD32_LE(m + 28));
 232              x8 = XOR(x8, LOAD32_LE(m + 32));
 233              x9 = XOR(x9, LOAD32_LE(m + 36));
 234              x10 = XOR(x10, LOAD32_LE(m + 40));
 235              x11 = XOR(x11, LOAD32_LE(m + 44));
 236              x12 = XOR(x12, LOAD32_LE(m + 48));
 237              x13 = XOR(x13, LOAD32_LE(m + 52));
 238              x14 = XOR(x14, LOAD32_LE(m + 56));
 239              x15 = XOR(x15, LOAD32_LE(m + 60));
 240              */
 241              $x0  =  $x0->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message,  0, 4)));
 242              $x1  =  $x1->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message,  4, 4)));
 243              $x2  =  $x2->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message,  8, 4)));
 244              $x3  =  $x3->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 12, 4)));
 245              $x4  =  $x4->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 16, 4)));
 246              $x5  =  $x5->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 20, 4)));
 247              $x6  =  $x6->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 24, 4)));
 248              $x7  =  $x7->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 28, 4)));
 249              $x8  =  $x8->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 32, 4)));
 250              $x9  =  $x9->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 36, 4)));
 251              $x10 = $x10->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 40, 4)));
 252              $x11 = $x11->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 44, 4)));
 253              $x12 = $x12->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 48, 4)));
 254              $x13 = $x13->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 52, 4)));
 255              $x14 = $x14->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 56, 4)));
 256              $x15 = $x15->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 60, 4)));
 257  
 258              /*
 259                  j12 = PLUSONE(j12);
 260                  if (!j12) {
 261                      j13 = PLUSONE(j13);
 262                  }
 263               */
 264              /** @var ParagonIE_Sodium_Core32_Int32 $j12 */
 265              $j12 = $j12->addInt(1);
 266              if ($j12->limbs[0] === 0 && $j12->limbs[1] === 0) {
 267                  $j13 = $j13->addInt(1);
 268              }
 269  
 270              /*
 271              STORE32_LE(c + 0, x0);
 272              STORE32_LE(c + 4, x1);
 273              STORE32_LE(c + 8, x2);
 274              STORE32_LE(c + 12, x3);
 275              STORE32_LE(c + 16, x4);
 276              STORE32_LE(c + 20, x5);
 277              STORE32_LE(c + 24, x6);
 278              STORE32_LE(c + 28, x7);
 279              STORE32_LE(c + 32, x8);
 280              STORE32_LE(c + 36, x9);
 281              STORE32_LE(c + 40, x10);
 282              STORE32_LE(c + 44, x11);
 283              STORE32_LE(c + 48, x12);
 284              STORE32_LE(c + 52, x13);
 285              STORE32_LE(c + 56, x14);
 286              STORE32_LE(c + 60, x15);
 287              */
 288  
 289              $block = $x0->toReverseString() .
 290                  $x1->toReverseString() .
 291                  $x2->toReverseString() .
 292                  $x3->toReverseString() .
 293                  $x4->toReverseString() .
 294                  $x5->toReverseString() .
 295                  $x6->toReverseString() .
 296                  $x7->toReverseString() .
 297                  $x8->toReverseString() .
 298                  $x9->toReverseString() .
 299                  $x10->toReverseString() .
 300                  $x11->toReverseString() .
 301                  $x12->toReverseString() .
 302                  $x13->toReverseString() .
 303                  $x14->toReverseString() .
 304                  $x15->toReverseString();
 305  
 306              /* Partial block */
 307              if ($bytes < 64) {
 308                  $c .= self::substr($block, 0, $bytes);
 309                  break;
 310              }
 311  
 312              /* Full block */
 313              $c .= $block;
 314              $bytes -= 64;
 315              if ($bytes <= 0) {
 316                  break;
 317              }
 318              $message = self::substr($message, 64);
 319          }
 320          /* end for(;;) loop */
 321  
 322          $ctx[12] = $j12;
 323          $ctx[13] = $j13;
 324          return $c;
 325      }
 326  
 327      /**
 328       * @internal You should not use this directly from another application
 329       *
 330       * @param int $len
 331       * @param string $nonce
 332       * @param string $key
 333       * @return string
 334       * @throws SodiumException
 335       * @throws TypeError
 336       */
 337      public static function stream($len = 64, $nonce = '', $key = '')
 338      {
 339          return self::encryptBytes(
 340              new ParagonIE_Sodium_Core32_ChaCha20_Ctx($key, $nonce),
 341              str_repeat("\x00", $len)
 342          );
 343      }
 344  
 345      /**
 346       * @internal You should not use this directly from another application
 347       *
 348       * @param int $len
 349       * @param string $nonce
 350       * @param string $key
 351       * @return string
 352       * @throws SodiumException
 353       * @throws TypeError
 354       */
 355      public static function ietfStream($len, $nonce = '', $key = '')
 356      {
 357          return self::encryptBytes(
 358              new ParagonIE_Sodium_Core32_ChaCha20_IetfCtx($key, $nonce),
 359              str_repeat("\x00", $len)
 360          );
 361      }
 362  
 363      /**
 364       * @internal You should not use this directly from another application
 365       *
 366       * @param string $message
 367       * @param string $nonce
 368       * @param string $key
 369       * @param string $ic
 370       * @return string
 371       * @throws SodiumException
 372       * @throws TypeError
 373       */
 374      public static function ietfStreamXorIc($message, $nonce = '', $key = '', $ic = '')
 375      {
 376          return self::encryptBytes(
 377              new ParagonIE_Sodium_Core32_ChaCha20_IetfCtx($key, $nonce, $ic),
 378              $message
 379          );
 380      }
 381  
 382      /**
 383       * @internal You should not use this directly from another application
 384       *
 385       * @param string $message
 386       * @param string $nonce
 387       * @param string $key
 388       * @param string $ic
 389       * @return string
 390       * @throws SodiumException
 391       * @throws TypeError
 392       */
 393      public static function streamXorIc($message, $nonce = '', $key = '', $ic = '')
 394      {
 395          return self::encryptBytes(
 396              new ParagonIE_Sodium_Core32_ChaCha20_Ctx($key, $nonce, $ic),
 397              $message
 398          );
 399      }
 400  }


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