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1 <?php 2 3 if (class_exists('ParagonIE_Sodium_Core_ChaCha20', false)) { 4 return; 5 } 6 7 /** 8 * Class ParagonIE_Sodium_Core_ChaCha20 9 */ 10 class ParagonIE_Sodium_Core_ChaCha20 extends ParagonIE_Sodium_Core_Util 11 { 12 /** 13 * Bitwise left rotation 14 * 15 * @internal You should not use this directly from another application 16 * 17 * @param int $v 18 * @param int $n 19 * @return int 20 */ 21 public static function rotate($v, $n) 22 { 23 $v &= 0xffffffff; 24 $n &= 31; 25 return (int) ( 26 0xffffffff & ( 27 ($v << $n) 28 | 29 ($v >> (32 - $n)) 30 ) 31 ); 32 } 33 34 /** 35 * The ChaCha20 quarter round function. Works on four 32-bit integers. 36 * 37 * @internal You should not use this directly from another application 38 * 39 * @param int $a 40 * @param int $b 41 * @param int $c 42 * @param int $d 43 * @return array<int, int> 44 */ 45 protected static function quarterRound($a, $b, $c, $d) 46 { 47 # a = PLUS(a,b); d = ROTATE(XOR(d,a),16); 48 /** @var int $a */ 49 $a = ($a + $b) & 0xffffffff; 50 $d = self::rotate($d ^ $a, 16); 51 52 # c = PLUS(c,d); b = ROTATE(XOR(b,c),12); 53 /** @var int $c */ 54 $c = ($c + $d) & 0xffffffff; 55 $b = self::rotate($b ^ $c, 12); 56 57 # a = PLUS(a,b); d = ROTATE(XOR(d,a), 8); 58 /** @var int $a */ 59 $a = ($a + $b) & 0xffffffff; 60 $d = self::rotate($d ^ $a, 8); 61 62 # c = PLUS(c,d); b = ROTATE(XOR(b,c), 7); 63 /** @var int $c */ 64 $c = ($c + $d) & 0xffffffff; 65 $b = self::rotate($b ^ $c, 7); 66 return array((int) $a, (int) $b, (int) $c, (int) $d); 67 } 68 69 /** 70 * @internal You should not use this directly from another application 71 * 72 * @param ParagonIE_Sodium_Core_ChaCha20_Ctx $ctx 73 * @param string $message 74 * 75 * @return string 76 * @throws TypeError 77 * @throws SodiumException 78 */ 79 public static function encryptBytes( 80 ParagonIE_Sodium_Core_ChaCha20_Ctx $ctx, 81 $message = '' 82 ) { 83 $bytes = self::strlen($message); 84 85 /* 86 j0 = ctx->input[0]; 87 j1 = ctx->input[1]; 88 j2 = ctx->input[2]; 89 j3 = ctx->input[3]; 90 j4 = ctx->input[4]; 91 j5 = ctx->input[5]; 92 j6 = ctx->input[6]; 93 j7 = ctx->input[7]; 94 j8 = ctx->input[8]; 95 j9 = ctx->input[9]; 96 j10 = ctx->input[10]; 97 j11 = ctx->input[11]; 98 j12 = ctx->input[12]; 99 j13 = ctx->input[13]; 100 j14 = ctx->input[14]; 101 j15 = ctx->input[15]; 102 */ 103 $j0 = (int) $ctx[0]; 104 $j1 = (int) $ctx[1]; 105 $j2 = (int) $ctx[2]; 106 $j3 = (int) $ctx[3]; 107 $j4 = (int) $ctx[4]; 108 $j5 = (int) $ctx[5]; 109 $j6 = (int) $ctx[6]; 110 $j7 = (int) $ctx[7]; 111 $j8 = (int) $ctx[8]; 112 $j9 = (int) $ctx[9]; 113 $j10 = (int) $ctx[10]; 114 $j11 = (int) $ctx[11]; 115 $j12 = (int) $ctx[12]; 116 $j13 = (int) $ctx[13]; 117 $j14 = (int) $ctx[14]; 118 $j15 = (int) $ctx[15]; 119 120 $c = ''; 121 for (;;) { 122 if ($bytes < 64) { 123 $message .= str_repeat("\x00", 64 - $bytes); 124 } 125 126 $x0 = (int) $j0; 127 $x1 = (int) $j1; 128 $x2 = (int) $j2; 129 $x3 = (int) $j3; 130 $x4 = (int) $j4; 131 $x5 = (int) $j5; 132 $x6 = (int) $j6; 133 $x7 = (int) $j7; 134 $x8 = (int) $j8; 135 $x9 = (int) $j9; 136 $x10 = (int) $j10; 137 $x11 = (int) $j11; 138 $x12 = (int) $j12; 139 $x13 = (int) $j13; 140 $x14 = (int) $j14; 141 $x15 = (int) $j15; 142 143 # for (i = 20; i > 0; i -= 2) { 144 for ($i = 20; $i > 0; $i -= 2) { 145 # QUARTERROUND( x0, x4, x8, x12) 146 list($x0, $x4, $x8, $x12) = self::quarterRound($x0, $x4, $x8, $x12); 147 148 # QUARTERROUND( x1, x5, x9, x13) 149 list($x1, $x5, $x9, $x13) = self::quarterRound($x1, $x5, $x9, $x13); 150 151 # QUARTERROUND( x2, x6, x10, x14) 152 list($x2, $x6, $x10, $x14) = self::quarterRound($x2, $x6, $x10, $x14); 153 154 # QUARTERROUND( x3, x7, x11, x15) 155 list($x3, $x7, $x11, $x15) = self::quarterRound($x3, $x7, $x11, $x15); 156 157 # QUARTERROUND( x0, x5, x10, x15) 158 list($x0, $x5, $x10, $x15) = self::quarterRound($x0, $x5, $x10, $x15); 159 160 # QUARTERROUND( x1, x6, x11, x12) 161 list($x1, $x6, $x11, $x12) = self::quarterRound($x1, $x6, $x11, $x12); 162 163 # QUARTERROUND( x2, x7, x8, x13) 164 list($x2, $x7, $x8, $x13) = self::quarterRound($x2, $x7, $x8, $x13); 165 166 # QUARTERROUND( x3, x4, x9, x14) 167 list($x3, $x4, $x9, $x14) = self::quarterRound($x3, $x4, $x9, $x14); 168 } 169 /* 170 x0 = PLUS(x0, j0); 171 x1 = PLUS(x1, j1); 172 x2 = PLUS(x2, j2); 173 x3 = PLUS(x3, j3); 174 x4 = PLUS(x4, j4); 175 x5 = PLUS(x5, j5); 176 x6 = PLUS(x6, j6); 177 x7 = PLUS(x7, j7); 178 x8 = PLUS(x8, j8); 179 x9 = PLUS(x9, j9); 180 x10 = PLUS(x10, j10); 181 x11 = PLUS(x11, j11); 182 x12 = PLUS(x12, j12); 183 x13 = PLUS(x13, j13); 184 x14 = PLUS(x14, j14); 185 x15 = PLUS(x15, j15); 186 */ 187 /** @var int $x0 */ 188 $x0 = ($x0 & 0xffffffff) + $j0; 189 /** @var int $x1 */ 190 $x1 = ($x1 & 0xffffffff) + $j1; 191 /** @var int $x2 */ 192 $x2 = ($x2 & 0xffffffff) + $j2; 193 /** @var int $x3 */ 194 $x3 = ($x3 & 0xffffffff) + $j3; 195 /** @var int $x4 */ 196 $x4 = ($x4 & 0xffffffff) + $j4; 197 /** @var int $x5 */ 198 $x5 = ($x5 & 0xffffffff) + $j5; 199 /** @var int $x6 */ 200 $x6 = ($x6 & 0xffffffff) + $j6; 201 /** @var int $x7 */ 202 $x7 = ($x7 & 0xffffffff) + $j7; 203 /** @var int $x8 */ 204 $x8 = ($x8 & 0xffffffff) + $j8; 205 /** @var int $x9 */ 206 $x9 = ($x9 & 0xffffffff) + $j9; 207 /** @var int $x10 */ 208 $x10 = ($x10 & 0xffffffff) + $j10; 209 /** @var int $x11 */ 210 $x11 = ($x11 & 0xffffffff) + $j11; 211 /** @var int $x12 */ 212 $x12 = ($x12 & 0xffffffff) + $j12; 213 /** @var int $x13 */ 214 $x13 = ($x13 & 0xffffffff) + $j13; 215 /** @var int $x14 */ 216 $x14 = ($x14 & 0xffffffff) + $j14; 217 /** @var int $x15 */ 218 $x15 = ($x15 & 0xffffffff) + $j15; 219 220 /* 221 x0 = XOR(x0, LOAD32_LE(m + 0)); 222 x1 = XOR(x1, LOAD32_LE(m + 4)); 223 x2 = XOR(x2, LOAD32_LE(m + 8)); 224 x3 = XOR(x3, LOAD32_LE(m + 12)); 225 x4 = XOR(x4, LOAD32_LE(m + 16)); 226 x5 = XOR(x5, LOAD32_LE(m + 20)); 227 x6 = XOR(x6, LOAD32_LE(m + 24)); 228 x7 = XOR(x7, LOAD32_LE(m + 28)); 229 x8 = XOR(x8, LOAD32_LE(m + 32)); 230 x9 = XOR(x9, LOAD32_LE(m + 36)); 231 x10 = XOR(x10, LOAD32_LE(m + 40)); 232 x11 = XOR(x11, LOAD32_LE(m + 44)); 233 x12 = XOR(x12, LOAD32_LE(m + 48)); 234 x13 = XOR(x13, LOAD32_LE(m + 52)); 235 x14 = XOR(x14, LOAD32_LE(m + 56)); 236 x15 = XOR(x15, LOAD32_LE(m + 60)); 237 */ 238 $x0 ^= self::load_4(self::substr($message, 0, 4)); 239 $x1 ^= self::load_4(self::substr($message, 4, 4)); 240 $x2 ^= self::load_4(self::substr($message, 8, 4)); 241 $x3 ^= self::load_4(self::substr($message, 12, 4)); 242 $x4 ^= self::load_4(self::substr($message, 16, 4)); 243 $x5 ^= self::load_4(self::substr($message, 20, 4)); 244 $x6 ^= self::load_4(self::substr($message, 24, 4)); 245 $x7 ^= self::load_4(self::substr($message, 28, 4)); 246 $x8 ^= self::load_4(self::substr($message, 32, 4)); 247 $x9 ^= self::load_4(self::substr($message, 36, 4)); 248 $x10 ^= self::load_4(self::substr($message, 40, 4)); 249 $x11 ^= self::load_4(self::substr($message, 44, 4)); 250 $x12 ^= self::load_4(self::substr($message, 48, 4)); 251 $x13 ^= self::load_4(self::substr($message, 52, 4)); 252 $x14 ^= self::load_4(self::substr($message, 56, 4)); 253 $x15 ^= self::load_4(self::substr($message, 60, 4)); 254 255 /* 256 j12 = PLUSONE(j12); 257 if (!j12) { 258 j13 = PLUSONE(j13); 259 } 260 */ 261 ++$j12; 262 if ($j12 & 0xf0000000) { 263 throw new SodiumException('Overflow'); 264 } 265 266 /* 267 STORE32_LE(c + 0, x0); 268 STORE32_LE(c + 4, x1); 269 STORE32_LE(c + 8, x2); 270 STORE32_LE(c + 12, x3); 271 STORE32_LE(c + 16, x4); 272 STORE32_LE(c + 20, x5); 273 STORE32_LE(c + 24, x6); 274 STORE32_LE(c + 28, x7); 275 STORE32_LE(c + 32, x8); 276 STORE32_LE(c + 36, x9); 277 STORE32_LE(c + 40, x10); 278 STORE32_LE(c + 44, x11); 279 STORE32_LE(c + 48, x12); 280 STORE32_LE(c + 52, x13); 281 STORE32_LE(c + 56, x14); 282 STORE32_LE(c + 60, x15); 283 */ 284 $block = self::store32_le((int) ($x0 & 0xffffffff)) . 285 self::store32_le((int) ($x1 & 0xffffffff)) . 286 self::store32_le((int) ($x2 & 0xffffffff)) . 287 self::store32_le((int) ($x3 & 0xffffffff)) . 288 self::store32_le((int) ($x4 & 0xffffffff)) . 289 self::store32_le((int) ($x5 & 0xffffffff)) . 290 self::store32_le((int) ($x6 & 0xffffffff)) . 291 self::store32_le((int) ($x7 & 0xffffffff)) . 292 self::store32_le((int) ($x8 & 0xffffffff)) . 293 self::store32_le((int) ($x9 & 0xffffffff)) . 294 self::store32_le((int) ($x10 & 0xffffffff)) . 295 self::store32_le((int) ($x11 & 0xffffffff)) . 296 self::store32_le((int) ($x12 & 0xffffffff)) . 297 self::store32_le((int) ($x13 & 0xffffffff)) . 298 self::store32_le((int) ($x14 & 0xffffffff)) . 299 self::store32_le((int) ($x15 & 0xffffffff)); 300 301 /* Partial block */ 302 if ($bytes < 64) { 303 $c .= self::substr($block, 0, $bytes); 304 break; 305 } 306 307 /* Full block */ 308 $c .= $block; 309 $bytes -= 64; 310 if ($bytes <= 0) { 311 break; 312 } 313 $message = self::substr($message, 64); 314 } 315 /* end for(;;) loop */ 316 317 $ctx[12] = $j12; 318 $ctx[13] = $j13; 319 return $c; 320 } 321 322 /** 323 * @internal You should not use this directly from another application 324 * 325 * @param int $len 326 * @param string $nonce 327 * @param string $key 328 * @return string 329 * @throws SodiumException 330 * @throws TypeError 331 */ 332 public static function stream($len = 64, $nonce = '', $key = '') 333 { 334 return self::encryptBytes( 335 new ParagonIE_Sodium_Core_ChaCha20_Ctx($key, $nonce), 336 str_repeat("\x00", $len) 337 ); 338 } 339 340 /** 341 * @internal You should not use this directly from another application 342 * 343 * @param int $len 344 * @param string $nonce 345 * @param string $key 346 * @return string 347 * @throws SodiumException 348 * @throws TypeError 349 */ 350 public static function ietfStream($len, $nonce = '', $key = '') 351 { 352 return self::encryptBytes( 353 new ParagonIE_Sodium_Core_ChaCha20_IetfCtx($key, $nonce), 354 str_repeat("\x00", $len) 355 ); 356 } 357 358 /** 359 * @internal You should not use this directly from another application 360 * 361 * @param string $message 362 * @param string $nonce 363 * @param string $key 364 * @param string $ic 365 * @return string 366 * @throws SodiumException 367 * @throws TypeError 368 */ 369 public static function ietfStreamXorIc($message, $nonce = '', $key = '', $ic = '') 370 { 371 return self::encryptBytes( 372 new ParagonIE_Sodium_Core_ChaCha20_IetfCtx($key, $nonce, $ic), 373 $message 374 ); 375 } 376 377 /** 378 * @internal You should not use this directly from another application 379 * 380 * @param string $message 381 * @param string $nonce 382 * @param string $key 383 * @param string $ic 384 * @return string 385 * @throws SodiumException 386 * @throws TypeError 387 */ 388 public static function streamXorIc($message, $nonce = '', $key = '', $ic = '') 389 { 390 return self::encryptBytes( 391 new ParagonIE_Sodium_Core_ChaCha20_Ctx($key, $nonce, $ic), 392 $message 393 ); 394 } 395 }
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| Generated: Sun Dec 22 01:00:02 2024 | Cross-referenced by PHPXref 0.7.1 |