更新(27/09/17):
由于mcrypt_encrypt自PHP 7.1.0起已弃用。我已经使用openssl添加了一个简单的加密/解密。
function encrypt($string, $key = 'PrivateKey', $secret = 'SecretKey', $method = 'AES-256-CBC') {
// hash
$key = hash('sha256', $key);
// create iv - encrypt method AES-256-CBC expects 16 bytes
$iv = substr(hash('sha256', $secret), 0, 16);
// encrypt
$output = openssl_encrypt($string, $method, $key, 0, $iv);
// encode
return base64_encode($output);
}
function decrypt($string, $key = 'PrivateKey', $secret = 'SecretKey', $method = 'AES-256-CBC') {
// hash
$key = hash('sha256', $key);
// create iv - encrypt method AES-256-CBC expects 16 bytes
$iv = substr(hash('sha256', $secret), 0, 16);
// decode
$string = base64_decode($string);
// decrypt
return openssl_decrypt($string, $method, $key, 0, $iv);
}
$str = 'Encrypt this text';
echo "Plain: " .$str. "\n";
// encrypt
$encrypted_str = encrypt($str);
echo "Encrypted: " .$encrypted_str. "\n";
// decrypt
$decrypted_str = decrypt($encrypted_str);
echo "Decrypted: " .$decrypted_str. "\n";
原答案:
再简单不过了:(PHP < 7.1.0):
<?php
define('SECRET',md5('Some secret key'));
function encrypt($value){
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
return mcrypt_encrypt(MCRYPT_RIJNDAEL_256, SECRET, $value, MCRYPT_MODE_ECB, $iv);
}
function decrypt($value){
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
return trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, SECRET, $value, MCRYPT_MODE_ECB, $iv));
}
?>