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PseudoCrypt with user friendly characters
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| <?php | |
| //I want to use set of characters that are easy to spell out -> 123456789ABCDEFGHIJKLMNPRSTUVZ | |
| class PseudoCrypt { | |
| /* Key: Next prime greater than 62 ^ n / 1.618033988749894848 */ | |
| /* Value: modular multiplicative inverse */ | |
| /* | |
| //usage: | |
| PseudoCrypt::useHumanFriendlyChars(); | |
| $str = '5'; | |
| echo $str . ' '; | |
| $str = PseudoCrypt::hash($str); | |
| echo $str . ' '; | |
| $str = PseudoCrypt::unhash($str); | |
| echo $str; | |
| // will output: 5 3M5M6 5 | |
| */ | |
| private static $golden_primes = array( | |
| '1' => '1', | |
| '41' => '59', | |
| '2377' => '1677', | |
| '147299' => '187507', | |
| '9132313' => '5952585', | |
| '566201239' => '643566407', | |
| '35104476161' => '22071637057', | |
| '2176477521929' => '294289236153', | |
| '134941606358731' => '88879354792675', | |
| '8366379594239857' => '7275288500431249', | |
| '518715534842869223' => '280042546585394647' | |
| ); | |
| /* Ascii : 0 9, A Z, a z */ | |
| /* $chars = array_merge(range(48,57), range(65,90), range(97,122)) */ | |
| private static $chars = array( | |
| 0 => 48, 1 => 49, 2 => 50, 3 => 51, 4 => 52, 5 => 53, 6 => 54, 7 => 55, 8 => 56, 9 => 57, 10 => 65, | |
| 11 => 66, 12 => 67, 13 => 68, 14 => 69, 15 => 70, 16 => 71, 17 => 72, 18 => 73, 19 => 74, 20 => 75, | |
| 21 => 76, 22 => 77, 23 => 78, 24 => 79, 25 => 80, 26 => 81, 27 => 82, 28 => 83, 29 => 84, 30 => 85, | |
| 31 => 86, 32 => 87, 33 => 88, 34 => 89, 35 => 90, 36 => 97, 37 => 98, 38 => 99, 39 => 100, 40 => 101, | |
| 41 => 102, 42 => 103, 43 => 104, 44 => 105, 45 => 106, 46 => 107, 47 => 108, 48 => 109, 49 => 110, | |
| 50 => 111, 51 => 112, 52 => 113, 53 => 114, 54 => 115, 55 => 116, 56 => 117, 57 => 118, 58 => 119, | |
| 59 => 120, 60 => 121, 61 => 122 | |
| ); | |
| public static function useHumanFriendlyChars() { | |
| $charString = "123456789ABCDEFGHIJKLMNPRSTUVZ"; | |
| self::$chars = array(); // Initialize as empty array | |
| foreach (str_split($charString) as $index => $char) { | |
| self::$chars[$index] = ord($char); | |
| } | |
| //30 base | |
| self::$golden_primes = array( | |
| '1' => '1', | |
| '19' => '19', | |
| '557' => '593', | |
| '16691' => '5411', | |
| '500629' => '465469', | |
| '15018247' => '2946583', | |
| '450546781' => '726829621', | |
| '13516403347' => '20577062683', | |
| '405492100019' => '605156531579', | |
| '12164763000569' => '2306086771529', | |
| '364942890016937' => '50936189822873' | |
| ); | |
| } | |
| public static function baseConvert($int) { | |
| $key = ""; | |
| $base = count(self::$chars); | |
| while (bccomp($int, 0) > 0) { | |
| $mod = bcmod($int, $base); | |
| $key .= chr(self::$chars[$mod]); | |
| $int = bcdiv($int, $base); | |
| } | |
| return strrev($key); | |
| } | |
| public static function hash($num, $len = 5) { | |
| $base = count(self::$chars); | |
| $ceil = bcpow($base, $len); | |
| $primes = array_keys(self::$golden_primes); | |
| $prime = $primes[$len]; | |
| $dec = bcmod(bcmul($num, $prime), $ceil); | |
| $hash = self::baseConvert($dec); | |
| return str_pad($hash, $len, "0", STR_PAD_LEFT); | |
| } | |
| public static function unbaseConvert($key) { | |
| $base = count(self::$chars); | |
| $int = 0; | |
| foreach (str_split(strrev($key)) as $i => $char) { | |
| $dec = array_search(ord($char), self::$chars); | |
| $int = bcadd(bcmul($dec, bcpow($base, $i)), $int); | |
| } | |
| return $int; | |
| } | |
| public static function unhash($hash) { | |
| $base = count(self::$chars); | |
| $len = strlen($hash); | |
| $ceil = bcpow($base, $len); | |
| $mmiprimes = array_values(self::$golden_primes); | |
| $mmi = $mmiprimes[$len]; | |
| $num = self::unbaseConvert($hash); | |
| $dec = bcmod(bcmul($num, $mmi), $ceil); | |
| return $dec; | |
| } | |
| } |
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