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1 <?php 2 3 /** 4 * Class ParagonIE_Sodium_Core_Base64UrlSafe 5 * 6 * Copyright (c) 2016 - 2018 Paragon Initiative Enterprises. 7 * Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com) 8 */ 9 class ParagonIE_Sodium_Core_Base64_UrlSafe 10 { 11 // COPY ParagonIE_Sodium_Core_Base64_Common STARTING HERE 12 /** 13 * Encode into Base64 14 * 15 * Base64 character set "[A-Z][a-z][0-9]+/" 16 * 17 * @param string $src 18 * @return string 19 * @throws TypeError 20 */ 21 public static function encode($src) 22 { 23 return self::doEncode($src, true); 24 } 25 26 /** 27 * Encode into Base64, no = padding 28 * 29 * Base64 character set "[A-Z][a-z][0-9]+/" 30 * 31 * @param string $src 32 * @return string 33 * @throws TypeError 34 */ 35 public static function encodeUnpadded($src) 36 { 37 return self::doEncode($src, false); 38 } 39 40 /** 41 * @param string $src 42 * @param bool $pad Include = padding? 43 * @return string 44 * @throws TypeError 45 */ 46 protected static function doEncode($src, $pad = true) 47 { 48 $dest = ''; 49 $srcLen = ParagonIE_Sodium_Core_Util::strlen($src); 50 // Main loop (no padding): 51 for ($i = 0; $i + 3 <= $srcLen; $i += 3) { 52 /** @var array<int, int> $chunk */ 53 $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, 3)); 54 $b0 = $chunk[1]; 55 $b1 = $chunk[2]; 56 $b2 = $chunk[3]; 57 58 $dest .= 59 self::encode6Bits( $b0 >> 2 ) . 60 self::encode6Bits((($b0 << 4) | ($b1 >> 4)) & 63) . 61 self::encode6Bits((($b1 << 2) | ($b2 >> 6)) & 63) . 62 self::encode6Bits( $b2 & 63); 63 } 64 // The last chunk, which may have padding: 65 if ($i < $srcLen) { 66 /** @var array<int, int> $chunk */ 67 $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, $srcLen - $i)); 68 $b0 = $chunk[1]; 69 if ($i + 1 < $srcLen) { 70 $b1 = $chunk[2]; 71 $dest .= 72 self::encode6Bits($b0 >> 2) . 73 self::encode6Bits((($b0 << 4) | ($b1 >> 4)) & 63) . 74 self::encode6Bits(($b1 << 2) & 63); 75 if ($pad) { 76 $dest .= '='; 77 } 78 } else { 79 $dest .= 80 self::encode6Bits( $b0 >> 2) . 81 self::encode6Bits(($b0 << 4) & 63); 82 if ($pad) { 83 $dest .= '=='; 84 } 85 } 86 } 87 return $dest; 88 } 89 90 /** 91 * decode from base64 into binary 92 * 93 * Base64 character set "./[A-Z][a-z][0-9]" 94 * 95 * @param string $src 96 * @param bool $strictPadding 97 * @return string 98 * @throws RangeException 99 * @throws TypeError 100 * @psalm-suppress RedundantCondition 101 */ 102 public static function decode($src, $strictPadding = false) 103 { 104 // Remove padding 105 $srcLen = ParagonIE_Sodium_Core_Util::strlen($src); 106 if ($srcLen === 0) { 107 return ''; 108 } 109 110 if ($strictPadding) { 111 if (($srcLen & 3) === 0) { 112 if ($src[$srcLen - 1] === '=') { 113 $srcLen--; 114 if ($src[$srcLen - 1] === '=') { 115 $srcLen--; 116 } 117 } 118 } 119 if (($srcLen & 3) === 1) { 120 throw new RangeException( 121 'Incorrect padding' 122 ); 123 } 124 if ($src[$srcLen - 1] === '=') { 125 throw new RangeException( 126 'Incorrect padding' 127 ); 128 } 129 } else { 130 $src = rtrim($src, '='); 131 $srcLen = ParagonIE_Sodium_Core_Util::strlen($src); 132 } 133 134 $err = 0; 135 $dest = ''; 136 // Main loop (no padding): 137 for ($i = 0; $i + 4 <= $srcLen; $i += 4) { 138 /** @var array<int, int> $chunk */ 139 $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, 4)); 140 $c0 = self::decode6Bits($chunk[1]); 141 $c1 = self::decode6Bits($chunk[2]); 142 $c2 = self::decode6Bits($chunk[3]); 143 $c3 = self::decode6Bits($chunk[4]); 144 145 $dest .= pack( 146 'CCC', 147 ((($c0 << 2) | ($c1 >> 4)) & 0xff), 148 ((($c1 << 4) | ($c2 >> 2)) & 0xff), 149 ((($c2 << 6) | $c3) & 0xff) 150 ); 151 $err |= ($c0 | $c1 | $c2 | $c3) >> 8; 152 } 153 // The last chunk, which may have padding: 154 if ($i < $srcLen) { 155 /** @var array<int, int> $chunk */ 156 $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, $srcLen - $i)); 157 $c0 = self::decode6Bits($chunk[1]); 158 159 if ($i + 2 < $srcLen) { 160 $c1 = self::decode6Bits($chunk[2]); 161 $c2 = self::decode6Bits($chunk[3]); 162 $dest .= pack( 163 'CC', 164 ((($c0 << 2) | ($c1 >> 4)) & 0xff), 165 ((($c1 << 4) | ($c2 >> 2)) & 0xff) 166 ); 167 $err |= ($c0 | $c1 | $c2) >> 8; 168 } elseif ($i + 1 < $srcLen) { 169 $c1 = self::decode6Bits($chunk[2]); 170 $dest .= pack( 171 'C', 172 ((($c0 << 2) | ($c1 >> 4)) & 0xff) 173 ); 174 $err |= ($c0 | $c1) >> 8; 175 } elseif ($i < $srcLen && $strictPadding) { 176 $err |= 1; 177 } 178 } 179 /** @var bool $check */ 180 $check = ($err === 0); 181 if (!$check) { 182 throw new RangeException( 183 'Base64::decode() only expects characters in the correct base64 alphabet' 184 ); 185 } 186 return $dest; 187 } 188 // COPY ParagonIE_Sodium_Core_Base64_Common ENDING HERE 189 /** 190 * Uses bitwise operators instead of table-lookups to turn 6-bit integers 191 * into 8-bit integers. 192 * 193 * Base64 character set: 194 * [A-Z] [a-z] [0-9] + / 195 * 0x41-0x5a, 0x61-0x7a, 0x30-0x39, 0x2b, 0x2f 196 * 197 * @param int $src 198 * @return int 199 */ 200 protected static function decode6Bits($src) 201 { 202 $ret = -1; 203 204 // if ($src > 0x40 && $src < 0x5b) $ret += $src - 0x41 + 1; // -64 205 $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 64); 206 207 // if ($src > 0x60 && $src < 0x7b) $ret += $src - 0x61 + 26 + 1; // -70 208 $ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 70); 209 210 // if ($src > 0x2f && $src < 0x3a) $ret += $src - 0x30 + 52 + 1; // 5 211 $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 5); 212 213 // if ($src == 0x2c) $ret += 62 + 1; 214 $ret += (((0x2c - $src) & ($src - 0x2e)) >> 8) & 63; 215 216 // if ($src == 0x5f) ret += 63 + 1; 217 $ret += (((0x5e - $src) & ($src - 0x60)) >> 8) & 64; 218 219 return $ret; 220 } 221 222 /** 223 * Uses bitwise operators instead of table-lookups to turn 8-bit integers 224 * into 6-bit integers. 225 * 226 * @param int $src 227 * @return string 228 */ 229 protected static function encode6Bits($src) 230 { 231 $diff = 0x41; 232 233 // if ($src > 25) $diff += 0x61 - 0x41 - 26; // 6 234 $diff += ((25 - $src) >> 8) & 6; 235 236 // if ($src > 51) $diff += 0x30 - 0x61 - 26; // -75 237 $diff -= ((51 - $src) >> 8) & 75; 238 239 // if ($src > 61) $diff += 0x2d - 0x30 - 10; // -13 240 $diff -= ((61 - $src) >> 8) & 13; 241 242 // if ($src > 62) $diff += 0x5f - 0x2b - 1; // 3 243 $diff += ((62 - $src) >> 8) & 49; 244 245 return pack('C', $src + $diff); 246 } 247 }
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