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POHow can I encode and decode a string with a simple passphrase in PHP?
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  1. POHow can I encode and decode a string with a simple passphrase in PHP?
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    copied!<p>I thought this would be simple but I can't find a simple solution to this..</p> <p>Is there a way to encode a string and decode a string with a simple passphrase? somesthing like this:</p> <pre><code>$encoded = stringEncrypt('someText','simpleKey'); echo stringDecrypt($encoded,'simpleKey'); //outputs someText; </code></pre> <p>I tried this but with no luck:</p> <pre><code>function lime_encrypt($data,$key) { return base_convert(bin2hex($data),16,10) * base_convert(bin2hex($key),16,10) ; } function lime_decrypt($data,$key) { return pack("H*",base_convert($data/base_convert(bin2hex($key),16,10),10,16)); } </code></pre> <p>I think this is because the multiplication doesn't returns a integer but a mathematical expression 6.28414834514E+25</p> <p>any idea how I can implement this?</p> <hr> <h2>edit</h2> <p>I reused another code I found on stack overflow and ended up with this:</p> <pre><code>function lime_encrypt($data,$key) { return base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $data, MCRYPT_MODE_CBC, md5(md5($key)))); } function lime_decrypt($data,$key) { return rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($key), base64_decode($data), MCRYPT_MODE_CBC, md5(md5($key))), "\0"); } </code></pre> <p>but I end up with a Fatal error: Call to undefined function mcrypt_encrypt() using php > 5 on linux centOS.</p> <p>So I'd rather stay simple and movable to other hostings...</p> <hr> <h2>Solution?</h2> <p>At the end, I'm using this, found on a blog:</p> <pre><code>function lime_encrypt($data,$key) { return openssl_encrypt($data, 'AES-128-CBC', $key,0,'fgrgfvcfghtfdrfg'); } function lime_decrypt($data,$key) { return openssl_decrypt($data, 'AES-128-CBC', $key,0,'fgrgfvcfghtfdrfg'); } </code></pre>
 

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