我可以对数据进行加密,但不能解密

问题描述 投票:0回答:1

我可以成功地加密传送的数据但遗憾的是无法解密它。有什么不对我decrypt()功能?也许这是一些与我的初始化向量(IV)。这里是我的代码:

function pad($data, $size) {
    $length = $size - strlen($data) % $size;
    return $data . str_repeat(chr($length), $length);
}

function unpad($data) {
    return substr($data, 0, -ord($data[strlen($data) - 1]));
}

//CORRECT ENCRYPTION METHOD
function encrypt($data) {
    $key = "SiadajerSiadajer";
    $iv_size = 16; 
    $iv = openssl_random_pseudo_bytes($iv_size, $strong);
    $encryptedData = openssl_encrypt(pad($data, 16), 'AES-256-CBC', $key,   OPENSSL_RAW_DATA, $iv);
    $joinedData = hex2bin(bin2hex($iv).bin2hex($encryptedData));
    $encodedJoinedData = base64_encode($joinedData);
    return $encodedJoinedData; 
}

//WRONG DECRYPTION FUNCTION
function decrypt($encodedJoinedData){
    $key = "SiadajerSiadajer";
    $DecodedData = base64_decode($encodedJoinedData);
    $size = strlen($DecodedData);
    $cipheredsize = $size - 16;
    $iv = substr($DecodedData, 0, 16);
    $halfDecryptedData = substr($DecodedData, 16, $size);
    $decryptedData = openssl_decrypt(unpad($halfDecryptedData, 16), 'AES-256-CBC', $key, OPENSSL_RAW_DATA, $iv);
    return $decryptedData;
}

$test = encrypt("sssss");
print $test;
$test2 = decrypt($test);
print $test2;
php security encryption aes
1个回答
1
投票

encrypt-方法替换行

$joinedData = hex2bin(bin2hex($iv).bin2hex($encryptedData));

$joinedData = $iv.$encryptedData;

因为在前面的表达式中的转换是不必要的。这种替换不会改变结果。

为解密部分的一种可能的解决办法是:

function decrypt($encodedJoinedData) {
    $joinedData = base64_decode($encodedJoinedData);                        
    $iv = substr($joinedData, 0, 16);
    $encryptedData = substr($joinedData, 16);
    $key = "SiadajerSiadajer";
    $decryptedData = openssl_decrypt($encryptedData, 'AES-256-CBC', $key, OPENSSL_RAW_DATA, $iv);   
    $unpaddedData = unpad($decryptedData);                              
    return $unpaddedData;
}
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