40 lines
1.3 KiB
PHP
40 lines
1.3 KiB
PHP
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<?php
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// Z internetow.
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class Encryption {
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var $skey = $config["imgcaptcha_key"];
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public function safe_b64encode($string) {
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$data = base64_encode($string);
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$data = str_replace(array('+','/','='),array('-','_',''),$data);
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return $data;
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}
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public function safe_b64decode($string) {
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$data = str_replace(array('-','_'),array('+','/'),$string);
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$mod4 = strlen($data) % 4;
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if ($mod4) {
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$data .= substr('====', $mod4);
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}
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return base64_decode($data);
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}
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public function encode($value){
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if(!$value){return false;}
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$text = $value;
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$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
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$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
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$crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $this->skey, $text, MCRYPT_MODE_ECB, $iv);
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return trim($this->safe_b64encode($crypttext));
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}
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public function decode($value){
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if(!$value){return false;}
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$crypttext = $this->safe_b64decode($value);
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$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
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$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
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$decrypttext = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $this->skey, $crypttext, MCRYPT_MODE_ECB, $iv);
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return trim($decrypttext);
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}
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}
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?>
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