LLMS_Hasher

LLMS_Hasher

Contents

Source Source

File: includes/class.llms.hasher.php

25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
class LLMS_Hasher {
 
    /**
     * Key: Next prime greater than 62 ^ n / 1.618033988749894848
     * Value: modular multiplicative inverse
     *
     * @var array
     */
    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))
     *
     * @var array
     */
    private static $chars62 = 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,
    );
 
    /**
     * Modulo function
     *
     * @todo  figure this out better...
     *        64 bit systems can use % without issue
     *        32 bit systems have problems with % and needs to use fmod
     *                however after 100001 unhash no longer works correctly when using fmod
     *
     * @param    int $a  first int
     * @param    int $b  second int
     * @return   int
     * @since    3.16.10
     * @version  3.16.10
     */
    private static function mod( $a, $b ) {
 
        // 64 bit systems
        if ( 8 === PHP_INT_SIZE ) {
            return $a % $b;
        }
        // 32 bit systems?
        return fmod( $a, $b );
 
    }
 
    /**
     * Base 62 encode a number
     *
     * @param    int $int  number to encode
     * @return   string
     * @since    3.16.7
     * @version  3.16.10
     */
    public static function base62( $int ) {
        $key = '';
        while ( $int > 0 ) {
            $mod  = self::mod( $int, 62 );
            $key .= chr( self::$chars62[ $mod ] );
            $int  = floor( $int / 62 );
        }
        return strrev( $key );
    }
 
    /**
     * Hash a number
     *
     * @param    int $num   number to hash
     * @return   string
     * @since    3.16.7
     * @version  3.24.0
     */
    public static function hash( $num ) {
 
        $numlen = strlen( $num );
        if ( $numlen <= 3 ) {
            $len = 3;
        } elseif ( 4 === $numlen || 5 === $numlen ) {
            $len = 4;
        } else {
            $len = 5;
        }
 
        $ceil   = pow( 62, $len );
        $primes = array_keys( self::$golden_primes );
        $prime  = $primes[ $len ];
        $dec    = self::mod( ( $num * $prime ), $ceil );
        $hash   = self::base62( $dec );
        return str_pad( $hash, $len, '0', STR_PAD_LEFT );
 
    }
 
    /**
     * Decode a base62 encoded string to get the associated number
     *
     * @param    string $key   encoded character
     * @return   int
     * @since    3.16.7
     * @version  3.16.7
     */
    public static function unbase62( $key ) {
        $int = 0;
        foreach ( str_split( strrev( $key ) ) as $i => $char ) {
            $dec = array_search( ord( $char ), self::$chars62 );
            $int = ( ( $dec * pow( 62, $i ) ) + $int );
        }
        return $int;
    }
 
    /**
     * Decode a hashed string to get the original number
     *
     * @param    [type] $hash  encoded hash string
     * @return   int
     * @since    3.16.7
     * @version  3.16.10
     */
    public static function unhash( $hash ) {
 
        $len       = strlen( $hash );
        $ceil      = pow( 62, $len );
        $mmiprimes = array_values( self::$golden_primes );
        $mmi       = $mmiprimes[ $len ];
        $num       = self::unbase62( $hash );
        $dec       = self::mod( ( $num * $mmi ), $ceil );
        return $dec;
 
    }
 
}

Expand full source code Collapse full source code View on GitHub

Top ↑

Methods Methods

  • base62 — Base 62 encode a number
  • hash — Hash a number
  • mod — Modulo function
  • unbase62 — Decode a base62 encoded string to get the associated number
  • unhash — Decode a hashed string to get the original number

Top ↑

Changelog Changelog

Changelog
Version Description
3.24.0 Unknown.
3.16.7 Introduced.

Top ↑

User Contributed Notes User Contributed Notes

You must log in before being able to contribute a note or feedback.