encryption - PHP decryption fails on some strings with trim()'s -


i'm having trouble decrypting values end %3d%3d. upon decrypting return value that's illegible. encrypted value being passed via querystring, i've run test looping through values 0 200 rule out problems url encoding.

encryption , decryption functions:

function encryptvalue($encrypt) {     $key = variable_get_local("privatekey", $default = "");     $iv = mcrypt_create_iv(mcrypt_get_iv_size(mcrypt_rijndael_256, mcrypt_mode_ecb),   mcrypt_rand);     $passcrypt = trim(mcrypt_encrypt(mcrypt_rijndael_256, $key, trim($encrypt), mcrypt_mode_ecb, $iv));     $encode = urlencode(base64_encode($passcrypt));     return $encode; }   function decryptvalue($decrypt) {     $key = variable_get_local("privatekey", $default = "");     $decoded = base64_decode(urldecode($decrypt));     $iv = mcrypt_create_iv(mcrypt_get_iv_size(mcrypt_rijndael_256, mcrypt_mode_ecb), mcrypt_rand);     $decrypted = trim(mcrypt_decrypt(mcrypt_rijndael_256, $key, trim($decoded), mcrypt_mode_ecb, $iv));     return $decrypted; }

i've tried keeping iv value identical across encryption , decryption doesn't change output. i've tried removing trim() around trim($decoded) didn't change either.

below used identify problem. between 0 , 200 encryption produce value ending on %3d%3d 9 times , result in decryption failing.

for($i=0;$i<200;$i++) {     echo encryptvalue($i) . "<br/>";     echo decryptvalue(encryptvalue($i)) . "<br/><hr/>"; }

thanks reading.

your problem trim function, shouldnt used. dont trim encoded data data removed, vital key have noticed.

it works this:

function encryptvalue($encrypt) {     $key = variable_get_local("privatekey", $default = "");     $iv = mcrypt_create_iv(mcrypt_get_iv_size(mcrypt_rijndael_256, mcrypt_mode_ecb),   mcrypt_rand);     $passcrypt = mcrypt_encrypt(mcrypt_rijndael_256, $key, trim($encrypt), mcrypt_mode_ecb, $iv);     $encode = urlencode(base64_encode($passcrypt));     return $encode; }   function decryptvalue($decrypt) {     $key = variable_get_local("privatekey", $default = "");     $decoded = base64_decode(urldecode($decrypt));     $iv = mcrypt_create_iv(mcrypt_get_iv_size(mcrypt_rijndael_256, mcrypt_mode_ecb), mcrypt_rand);     $decrypted = mcrypt_decrypt(mcrypt_rijndael_256, $key, $decoded, mcrypt_mode_ecb, $iv);     return $decrypted; }

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