googleanalytics
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lib
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analytics-admin
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vendor
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paragonie
/
constant_time_encoding
/
src
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Base64.php
googleanalytics
/
lib
/
analytics-admin
/
vendor
/
paragonie
/
constant_time_encoding
/
src
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Base64DotSlash.php
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Base64DotSlashOrdered.php
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Base64UrlSafe.php
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Binary.php
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EncoderInterface.php
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RFC4648.php
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Base64.php
315 lines
| 1 | <?php |
| 2 | declare(strict_types=1); |
| 3 | namespace ParagonIE\ConstantTime; |
| 4 | |
| 5 | use InvalidArgumentException; |
| 6 | use RangeException; |
| 7 | use TypeError; |
| 8 | |
| 9 | /** |
| 10 | * Copyright (c) 2016 - 2022 Paragon Initiative Enterprises. |
| 11 | * Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com) |
| 12 | * |
| 13 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 14 | * of this software and associated documentation files (the "Software"), to deal |
| 15 | * in the Software without restriction, including without limitation the rights |
| 16 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 17 | * copies of the Software, and to permit persons to whom the Software is |
| 18 | * furnished to do so, subject to the following conditions: |
| 19 | * |
| 20 | * The above copyright notice and this permission notice shall be included in all |
| 21 | * copies or substantial portions of the Software. |
| 22 | * |
| 23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 24 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 25 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 26 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 27 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 28 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 29 | * SOFTWARE. |
| 30 | */ |
| 31 | |
| 32 | /** |
| 33 | * Class Base64 |
| 34 | * [A-Z][a-z][0-9]+/ |
| 35 | * |
| 36 | * @package ParagonIE\ConstantTime |
| 37 | */ |
| 38 | abstract class Base64 implements EncoderInterface |
| 39 | { |
| 40 | /** |
| 41 | * Encode into Base64 |
| 42 | * |
| 43 | * Base64 character set "[A-Z][a-z][0-9]+/" |
| 44 | * |
| 45 | * @param string $binString |
| 46 | * @return string |
| 47 | * |
| 48 | * @throws TypeError |
| 49 | */ |
| 50 | public static function encode(string $binString): string |
| 51 | { |
| 52 | return static::doEncode($binString, true); |
| 53 | } |
| 54 | |
| 55 | /** |
| 56 | * Encode into Base64, no = padding |
| 57 | * |
| 58 | * Base64 character set "[A-Z][a-z][0-9]+/" |
| 59 | * |
| 60 | * @param string $src |
| 61 | * @return string |
| 62 | * |
| 63 | * @throws TypeError |
| 64 | */ |
| 65 | public static function encodeUnpadded(string $src): string |
| 66 | { |
| 67 | return static::doEncode($src, false); |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * @param string $src |
| 72 | * @param bool $pad Include = padding? |
| 73 | * @return string |
| 74 | * |
| 75 | * @throws TypeError |
| 76 | */ |
| 77 | protected static function doEncode(string $src, bool $pad = true): string |
| 78 | { |
| 79 | $dest = ''; |
| 80 | $srcLen = Binary::safeStrlen($src); |
| 81 | // Main loop (no padding): |
| 82 | for ($i = 0; $i + 3 <= $srcLen; $i += 3) { |
| 83 | /** @var array<int, int> $chunk */ |
| 84 | $chunk = \unpack('C*', Binary::safeSubstr($src, $i, 3)); |
| 85 | $b0 = $chunk[1]; |
| 86 | $b1 = $chunk[2]; |
| 87 | $b2 = $chunk[3]; |
| 88 | |
| 89 | $dest .= |
| 90 | static::encode6Bits( $b0 >> 2 ) . |
| 91 | static::encode6Bits((($b0 << 4) | ($b1 >> 4)) & 63) . |
| 92 | static::encode6Bits((($b1 << 2) | ($b2 >> 6)) & 63) . |
| 93 | static::encode6Bits( $b2 & 63); |
| 94 | } |
| 95 | // The last chunk, which may have padding: |
| 96 | if ($i < $srcLen) { |
| 97 | /** @var array<int, int> $chunk */ |
| 98 | $chunk = \unpack('C*', Binary::safeSubstr($src, $i, $srcLen - $i)); |
| 99 | $b0 = $chunk[1]; |
| 100 | if ($i + 1 < $srcLen) { |
| 101 | $b1 = $chunk[2]; |
| 102 | $dest .= |
| 103 | static::encode6Bits($b0 >> 2) . |
| 104 | static::encode6Bits((($b0 << 4) | ($b1 >> 4)) & 63) . |
| 105 | static::encode6Bits(($b1 << 2) & 63); |
| 106 | if ($pad) { |
| 107 | $dest .= '='; |
| 108 | } |
| 109 | } else { |
| 110 | $dest .= |
| 111 | static::encode6Bits( $b0 >> 2) . |
| 112 | static::encode6Bits(($b0 << 4) & 63); |
| 113 | if ($pad) { |
| 114 | $dest .= '=='; |
| 115 | } |
| 116 | } |
| 117 | } |
| 118 | return $dest; |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * decode from base64 into binary |
| 123 | * |
| 124 | * Base64 character set "./[A-Z][a-z][0-9]" |
| 125 | * |
| 126 | * @param string $encodedString |
| 127 | * @param bool $strictPadding |
| 128 | * @return string |
| 129 | * |
| 130 | * @throws RangeException |
| 131 | * @throws TypeError |
| 132 | * @psalm-suppress RedundantCondition |
| 133 | */ |
| 134 | public static function decode(string $encodedString, bool $strictPadding = false): string |
| 135 | { |
| 136 | // Remove padding |
| 137 | $srcLen = Binary::safeStrlen($encodedString); |
| 138 | if ($srcLen === 0) { |
| 139 | return ''; |
| 140 | } |
| 141 | |
| 142 | if ($strictPadding) { |
| 143 | if (($srcLen & 3) === 0) { |
| 144 | if ($encodedString[$srcLen - 1] === '=') { |
| 145 | $srcLen--; |
| 146 | if ($encodedString[$srcLen - 1] === '=') { |
| 147 | $srcLen--; |
| 148 | } |
| 149 | } |
| 150 | } |
| 151 | if (($srcLen & 3) === 1) { |
| 152 | throw new RangeException( |
| 153 | 'Incorrect padding' |
| 154 | ); |
| 155 | } |
| 156 | if ($encodedString[$srcLen - 1] === '=') { |
| 157 | throw new RangeException( |
| 158 | 'Incorrect padding' |
| 159 | ); |
| 160 | } |
| 161 | } else { |
| 162 | $encodedString = \rtrim($encodedString, '='); |
| 163 | $srcLen = Binary::safeStrlen($encodedString); |
| 164 | } |
| 165 | |
| 166 | $err = 0; |
| 167 | $dest = ''; |
| 168 | // Main loop (no padding): |
| 169 | for ($i = 0; $i + 4 <= $srcLen; $i += 4) { |
| 170 | /** @var array<int, int> $chunk */ |
| 171 | $chunk = \unpack('C*', Binary::safeSubstr($encodedString, $i, 4)); |
| 172 | $c0 = static::decode6Bits($chunk[1]); |
| 173 | $c1 = static::decode6Bits($chunk[2]); |
| 174 | $c2 = static::decode6Bits($chunk[3]); |
| 175 | $c3 = static::decode6Bits($chunk[4]); |
| 176 | |
| 177 | $dest .= \pack( |
| 178 | 'CCC', |
| 179 | ((($c0 << 2) | ($c1 >> 4)) & 0xff), |
| 180 | ((($c1 << 4) | ($c2 >> 2)) & 0xff), |
| 181 | ((($c2 << 6) | $c3 ) & 0xff) |
| 182 | ); |
| 183 | $err |= ($c0 | $c1 | $c2 | $c3) >> 8; |
| 184 | } |
| 185 | // The last chunk, which may have padding: |
| 186 | if ($i < $srcLen) { |
| 187 | /** @var array<int, int> $chunk */ |
| 188 | $chunk = \unpack('C*', Binary::safeSubstr($encodedString, $i, $srcLen - $i)); |
| 189 | $c0 = static::decode6Bits($chunk[1]); |
| 190 | |
| 191 | if ($i + 2 < $srcLen) { |
| 192 | $c1 = static::decode6Bits($chunk[2]); |
| 193 | $c2 = static::decode6Bits($chunk[3]); |
| 194 | $dest .= \pack( |
| 195 | 'CC', |
| 196 | ((($c0 << 2) | ($c1 >> 4)) & 0xff), |
| 197 | ((($c1 << 4) | ($c2 >> 2)) & 0xff) |
| 198 | ); |
| 199 | $err |= ($c0 | $c1 | $c2) >> 8; |
| 200 | if ($strictPadding) { |
| 201 | $err |= ($c2 << 6) & 0xff; |
| 202 | } |
| 203 | } elseif ($i + 1 < $srcLen) { |
| 204 | $c1 = static::decode6Bits($chunk[2]); |
| 205 | $dest .= \pack( |
| 206 | 'C', |
| 207 | ((($c0 << 2) | ($c1 >> 4)) & 0xff) |
| 208 | ); |
| 209 | $err |= ($c0 | $c1) >> 8; |
| 210 | if ($strictPadding) { |
| 211 | $err |= ($c1 << 4) & 0xff; |
| 212 | } |
| 213 | } elseif ($strictPadding) { |
| 214 | $err |= 1; |
| 215 | } |
| 216 | } |
| 217 | $check = ($err === 0); |
| 218 | if (!$check) { |
| 219 | throw new RangeException( |
| 220 | 'Base64::decode() only expects characters in the correct base64 alphabet' |
| 221 | ); |
| 222 | } |
| 223 | return $dest; |
| 224 | } |
| 225 | |
| 226 | /** |
| 227 | * @param string $encodedString |
| 228 | * @return string |
| 229 | */ |
| 230 | public static function decodeNoPadding(string $encodedString): string |
| 231 | { |
| 232 | $srcLen = Binary::safeStrlen($encodedString); |
| 233 | if ($srcLen === 0) { |
| 234 | return ''; |
| 235 | } |
| 236 | if (($srcLen & 3) === 0) { |
| 237 | if ($encodedString[$srcLen - 1] === '=') { |
| 238 | throw new InvalidArgumentException( |
| 239 | "decodeNoPadding() doesn't tolerate padding" |
| 240 | ); |
| 241 | } |
| 242 | if (($srcLen & 3) > 1) { |
| 243 | if ($encodedString[$srcLen - 2] === '=') { |
| 244 | throw new InvalidArgumentException( |
| 245 | "decodeNoPadding() doesn't tolerate padding" |
| 246 | ); |
| 247 | } |
| 248 | } |
| 249 | } |
| 250 | return static::decode( |
| 251 | $encodedString, |
| 252 | true |
| 253 | ); |
| 254 | } |
| 255 | |
| 256 | /** |
| 257 | * Uses bitwise operators instead of table-lookups to turn 6-bit integers |
| 258 | * into 8-bit integers. |
| 259 | * |
| 260 | * Base64 character set: |
| 261 | * [A-Z] [a-z] [0-9] + / |
| 262 | * 0x41-0x5a, 0x61-0x7a, 0x30-0x39, 0x2b, 0x2f |
| 263 | * |
| 264 | * @param int $src |
| 265 | * @return int |
| 266 | */ |
| 267 | protected static function decode6Bits(int $src): int |
| 268 | { |
| 269 | $ret = -1; |
| 270 | |
| 271 | // if ($src > 0x40 && $src < 0x5b) $ret += $src - 0x41 + 1; // -64 |
| 272 | $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 64); |
| 273 | |
| 274 | // if ($src > 0x60 && $src < 0x7b) $ret += $src - 0x61 + 26 + 1; // -70 |
| 275 | $ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 70); |
| 276 | |
| 277 | // if ($src > 0x2f && $src < 0x3a) $ret += $src - 0x30 + 52 + 1; // 5 |
| 278 | $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 5); |
| 279 | |
| 280 | // if ($src == 0x2b) $ret += 62 + 1; |
| 281 | $ret += (((0x2a - $src) & ($src - 0x2c)) >> 8) & 63; |
| 282 | |
| 283 | // if ($src == 0x2f) ret += 63 + 1; |
| 284 | $ret += (((0x2e - $src) & ($src - 0x30)) >> 8) & 64; |
| 285 | |
| 286 | return $ret; |
| 287 | } |
| 288 | |
| 289 | /** |
| 290 | * Uses bitwise operators instead of table-lookups to turn 8-bit integers |
| 291 | * into 6-bit integers. |
| 292 | * |
| 293 | * @param int $src |
| 294 | * @return string |
| 295 | */ |
| 296 | protected static function encode6Bits(int $src): string |
| 297 | { |
| 298 | $diff = 0x41; |
| 299 | |
| 300 | // if ($src > 25) $diff += 0x61 - 0x41 - 26; // 6 |
| 301 | $diff += ((25 - $src) >> 8) & 6; |
| 302 | |
| 303 | // if ($src > 51) $diff += 0x30 - 0x61 - 26; // -75 |
| 304 | $diff -= ((51 - $src) >> 8) & 75; |
| 305 | |
| 306 | // if ($src > 61) $diff += 0x2b - 0x30 - 10; // -15 |
| 307 | $diff -= ((61 - $src) >> 8) & 15; |
| 308 | |
| 309 | // if ($src > 62) $diff += 0x2f - 0x2b - 1; // 3 |
| 310 | $diff += ((62 - $src) >> 8) & 3; |
| 311 | |
| 312 | return \pack('C', $src + $diff); |
| 313 | } |
| 314 | } |
| 315 |