Summary: Mcrypt 2.4.7 is a powerful encryption algorithm extension library, which includes 22 algorithms, including the following algorithms:
Blowfish RC2 Safer-sk64 xtea
Cast-256 RC4 Safer-sk128
DES RC4-iv Serpent
Enigma Rijndael-128 Threeway
Gost Rijndael-192 TripleDES
LOKI97 Rijndael-256 Twofish
How to install Mcrypt
in PanamaSaferplus Wake
?Mcrypt is not included in the standard PHP package, so you need to download it. The download address is: ftp://argeas.cs-net.gr/pub/unix/mcrypt/ . After downloading, compile it and extend it in PHP as follows:
Download the Mcrypt package.
gunzipmcrypt-xxxtar.gz
tar -xvfmcrypt-xxxtar
./configure --disable-posix-threads
make
make install
cd to your PHP directory.
./configure -with-mcrypt=[dir] [--other-configuration-directives]
make
make install
makes appropriate modifications to the server based on your requirements and PHP installation.
How to use Mcrypt extension library to encrypt data?
First, we will cover how to use the Mcrypt extension library to encrypt data, and then we will cover how to use it to decrypt. The following code demonstrates this process. It first encrypts the data, then displays the encrypted data on the browser, restores the encrypted data to the original string, and displays it on the browser.
Use Mcrypt to encrypt and decrypt data
＜?php
// Designate string to be encrypted
$string = "Applied Cryptography, by Bruce Schneier, is
a wonderful cryptography reference.";
// Encryption/decryption key
$key = "Four score and twenty years ago";
// Encryption Algorithm
$cipher_alg = MCRYPT_RIJNDAEL_128;
// Create the initialization vector for added security.
$iv = mcrypt_create_iv(mcrypt_get_iv_size($cipher_alg,
MCRYPT_MODE_ECB), MCRYPT_RAND);
// Output original string
print "Original string: $string
";
// Encrypt $string
$encrypted_string = mcrypt_encrypt($cipher_alg, $key,
$string, MCRYPT_MODE_CBC, $iv);
// Convert to hexadecimal and output to browser
print "Encrypted string: ".bin2hex($encrypted_string)."
";
$decrypted_string = mcrypt_decrypt($cipher_alg, $key,
$encrypted_string, MCRYPT_MODE_CBC, $iv);
print "Decrypted string: $decrypted_string";
?>
Executing the above script will produce the following output:
Original string: Applied Cryptography, by Bruce Schneier, is a wonderful cryptography reference.
Encrypted string: 02a7c58b1ebd22a9523468694b091e60411cc4dea8652bb8072 34fa06bbfb20e71ecf525f29df58e28f3d9bf 541f7ebcecf62b c89fde4d8e7ba1e6cc9ea24850478c11742f5cfa1d23fe22fe8 bfbab5e
Decrypted string: Applied Cryptography, by Bruce Schneier, is a wonderful cryptography reference.
The two most typical functions in the above code are mcrypt_encrypt() and mcrypt_decrypt(), and their uses are obvious. We used the "Telegraph Codebook" mode. Mcrypt provides several encryption methods. Since each encryption method has specific characters that can affect the security of the password, you need to understand each mode. For those readers who have not been exposed to cryptography systems, they may be more interested in the mcrypt_create_iv() function. We will mention the initialization vector (hence, iv) it creates, which can make each piece of information independent of each other. Although not all modes require this initialization variable, PHP will give a warning message if this variable is not provided in the required mode.