解密用aspEncrypt加密的php中的字符串

function decrypt($sString, $sIv, $sKey, $iCipherAlg) {       
   $sDecrypted = mcrypt_decrypt($iCipherAlg, $sKey, $sString, MCRYPT_MODE_CBC, $sIv);
    return trim($sDecrypted);
}

function hex2bin($sData) {
    $iLen = strlen($sData);
    $sNewData = \'\';
    for($iCount=0;$iCount<$iLen;$iCount+=2) {
        $sNewData .= pack(\"C\",hexdec(substr($sData,$iCount,2)));
    }
    return $sNewData;
} 

$sKey = \'this is my key\';
// first 32 chars are IV
$sIv = hex2bin(substr($sEncodedData, 0, 32));
$sEncodedData = substr($sEncodedData, 32);
$sEncodedRaw = hex2bin($sEncodedData);
$sDecrypted = decrypt($sEncodedRaw, $sIv, $sKey, MCRYPT_RIJNDAEL_128);

$sIv = mcrypt_create_iv(mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC), MCRYPT_RAND);
$sKey = \'this is my key\';
$sContent = \'a lot of content\';
$sEncrypted = bin2hex(mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $sKey, $sContent, MCRYPT_MODE_CBC, $sIv));
$sFullEncodedText = bin2hex($sIv) . $sEncrypted;