问题
I need a PHP function, AES256_encode($dataToEcrypt)
to encrypt the $data
into AES-256 and another one AES256_decode($encryptedData)
do the opposite. Does anyone know what code should this functions have?
回答1:
Look at the mcrypt module
AES-Rijndael example taken from here
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
$iv = mcrypt_create_iv($iv_size, MCRYPT_DEV_URANDOM);
$key = pack('H*', "bcb04b7e103a0cd8b54763051cef08bc55abe029fdebae5e1d417e2ffb2a00a3");
# show key size use either 16, 24 or 32 byte keys for AES-128, 192
# and 256 respectively
$key_size = strlen($key);
echo "Key size: " . $key_size . "\n";
$text = "Meet me at 11 o'clock behind the monument.";
echo strlen($text) . "\n";
$crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $text, MCRYPT_MODE_CBC, $iv);
echo strlen($crypttext) . "\n";
This is the decrypt function
回答2:
I need a PHP function,
AES256_encode($dataToEcrypt)
to encrypt the$data
into AES-256 and another oneAES256_decode($encryptedData)
do the opposite. Does anyone know what code should this functions have?
There is a difference between encrypting and encoding.
Do you really need AES-256? The security of AES-256 versus AES-128 isn't that significant; you're more likely to screw up at the protocol layer than get hacked because you used a 128-bit block cipher instead of a 256-bit block cipher.
Important - Use A Library
- defuse/php-encryption
- PECL libsodium
- Halite (libsodium wrapper, now stable)
A Quick and Dirty AES-256 Implementation
If you're interested in building your own not for the sake of deploying it in production but rather for the sake of your own education, I've included a sample AES256
/**
* This is a quick and dirty proof of concept for StackOverflow.
*
* @ref http://stackoverflow.com/q/6770370/2224584
*
* Do not use this in production.
*/
abstract class ExperimentalAES256DoNotActuallyUse
{
/**
* Encrypt with AES-256-CTR + HMAC-SHA-512
*
* @param string $plaintext Your message
* @param string $encryptionKey Key for encryption
* @param string $macKey Key for calculating the MAC
* @return string
*/
public static function encrypt($plaintext, $encryptionKey, $macKey)
{
$nonce = random_bytes(16);
$ciphertext = openssl_encrypt(
$plaintext,
'aes-256-ctr',
$encryptionKey,
OPENSSL_RAW_DATA,
$nonce
);
$mac = hash_hmac('sha512', $nonce.$ciphertext, $macKey, true);
return base64_encode($mac.$nonce.$ciphertext);
}
/**
* Verify HMAC-SHA-512 then decrypt AES-256-CTR
*
* @param string $message Encrypted message
* @param string $encryptionKey Key for encryption
* @param string $macKey Key for calculating the MAC
*/
public static function decrypt($message, $encryptionKey, $macKey)
{
$decoded = base64_decode($message);
$mac = mb_substr($message, 0, 64, '8bit');
$nonce = mb_substr($message, 64, 16, '8bit');
$ciphertext = mb_substr($message, 80, null, '8bit');
$calc = hash_hmac('sha512', $nonce.$ciphertext, $macKey, true);
if (!hash_equals($calc, $mac)) {
throw new Exception('Invalid MAC');
}
return openssl_decrypt(
$ciphertext,
'aes-256-ctr',
$encryptionKey,
OPENSSL_RAW_DATA,
$nonce
);
}
}
Usage
First, generate two keys (yes, two of them) and store them somehow.
$eKey = random_bytes(32);
$aKey = random_bytes(32);
Then to encrypt/decrypt messages:
$plaintext = 'This is just a test message.';
$encrypted = ExperimentalAES256DoNotActuallyUse::encrypt($plaintext, $eKey, $aKey);
$decrypted = ExperimentalAES256DoNotActuallyUse::decrypt($encrypted, $eKey, $aKey);
If you don't have random_bytes()
, get random_compat.
回答3:
MCRYPT_RIJNDAEL_256 is not equivalent to AES_256.
The way to make RIJNDAEL be decrypted from AES is to use MCRYPT_RIJNDAEL_128 and padd the string to encrypt before encrypting
AES-256 has BlockSize=128bit and KeySize=256bit Rijndael-256 has BlockSize=256bit and KeySize=256bit
Just AES/Rijndael 128bit are identical. Rijndael-192 and Rijndael-256 are not identical to AES-192 and AES-256 (block sizes and number of rounds differ).
回答4:
$key = '324325923495kdfgiert734t'; // key used for decryption in jasper code
$text = 'string_to_be_encrypted';
$encrypted = fnEncrypt($text, $key);
function fnEncrypt( $plaintext, $key )
{
$plaintext = pkcs5_pad($plaintext, 16);
return bin2hex(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, hex2bin($key), $plaintext, MCRYPT_MODE_ECB));
}
function pkcs5_pad ($text, $blocksize)
{
$pad = $blocksize - (strlen($text) % $blocksize);
return $text . str_repeat(chr($pad), $pad);
}
function hex2bin($hexdata)
{
$bindata = "";
for ($i = 0; $i < strlen($hexdata); $i += 2)
{
$bindata .= chr(hexdec(substr($hexdata, $i, 2)));
}
return $bindata;
}
来源:https://stackoverflow.com/questions/6770370/aes-256-encryption-in-php