44 lines
1.1 KiB
PHP
44 lines
1.1 KiB
PHP
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<?php
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class RC4Crypt {
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public static function encrypt_ ($pwd, $data, $ispwdHex = 0){
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if ($ispwdHex)
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$pwd = @pack('H*', $pwd);
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$key[] = '';
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$box[] = '';
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$cipher = '';
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$pwd_length = strlen($pwd);
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$data_length = strlen($data);
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for ($i = 0; $i < 256; $i++){
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$key[$i] = ord($pwd[$i % $pwd_length]);
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$box[$i] = $i;
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}
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for ($j = $i = 0; $i < 256; $i++){
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$j = ($j + $box[$i] + $key[$i]) % 256;
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$tmp = $box[$i];
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$box[$i] = $box[$j];
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$box[$j] = $tmp;
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}
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for ($a = $j = $i = 0; $i < $data_length; $i++){
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$a = ($a + 1) % 256;
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$j = ($j + $box[$a]) % 256;
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$tmp = $box[$a];
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$box[$a] = $box[$j];
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$box[$j] = $tmp;
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$k = $box[(($box[$a] + $box[$j]) % 256)];
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$cipher .= chr(ord($data[$i]) ^ $k);
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}
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return $cipher;
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}
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public static function decrypt_ ($pwd, $data, $ispwdHex = 0){
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return RC4Crypt::encrypt_($pwd, $data, $ispwdHex);
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}
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}
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function encrypt($string, $key){
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return base64_encode(bin2hex(RC4Crypt::encrypt_($key, $string)));
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}
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function decrypt($string, $key){
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return RC4Crypt::decrypt_($key, hex2bin(base64_decode($string)));
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}
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?>
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