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function encrypt_text($plain_text, $key){
bin2hex(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $plain_text, MCRYPT_
+MODE_ECB));
return $encrypt_text;
}

use Crypt::Rijndael;
use Crypt::CBC;
...
my $cipher_text = $cipher->encrypt($plain_text);
my $cipher_block = unpack ("H*", $cipher_text);
return $cipher_block;