PHP AES CBC

Class Aes_mcrypt {private $hex _iv = ' 00000000000000000000000000000000 '; # converted JAVA byte code in to hex and place    D it here function __construct ($key) {$this->key = hash (' sha256 ', $key, true);        } function Encrypt ($str) {$td = Mcrypt_module_open (mcrypt_rijndael_128, ', MCRYPT_MODE_CBC, ');        Mcrypt_generic_init ($TD, $this->key, $this->hextostr ($this->hex_iv));        $block = Mcrypt_get_block_size (mcrypt_rijndael_128, MCRYPT_MODE_CBC);        $block = Mcrypt_enc_get_block_size ($TD);        $str = $this->addpadding ($str, $block);        $encrypted = Mcrypt_generic ($TD, $STR);        Mcrypt_generic_deinit ($TD);        Mcrypt_module_close ($TD);    Return Base64_encode ($encrypted);        } function Decrypt ($code) {$td = Mcrypt_module_open (mcrypt_rijndael_128, ', MCRYPT_MODE_CBC, ');        Mcrypt_generic_init ($TD, $this->key, $this->hextostr ($this->hex_iv)); $str = Mdecrypt_generic ($TD, Base64_decode ($code));        Mcrypt_generic_deinit ($TD);        Mcrypt_module_close ($TD);    return $this->strippadding ($STR); }/* for PKCS7 padding */Private Function addpadding ($string, $blocksize = +) {$len = strlen ($str        ing);        $pad = $blocksize-($len% $blocksize);        $string. = Str_repeat (Chr ($pad), $pad);    return $string;        } Private Function Strippadding ($string) {$slast = Ord (substr ($string,-1));        $SLASTC = Chr ($slast);        $pcheck = substr ($string,-$slast); if (Preg_match ("/$SLASTC {"). $slast.            "}/", $string)) {$string = substr ($string, 0, strlen ($string)-$slast);        return $string;        } else {return false;        }} Public Function Hextostr ($hex) {$string = ';        for ($i =0; $i < strlen ($hex)-1; $i +=2) {$string. = Chr (Hexdec ($hex [$i]. $hex [$i +1]);    } return $string; }}

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