AES128 is an implementacion of cipher algorithm AES 128 bits (Advanced Encryption Standard). It can encrypt/decrypt data without external libraries using this algorithm.

To install AES128 copy the file AES128.php to your php scripts execution directory.

There aren't configuration options.

This functions are used to crypt data:

• AES128(boolHex, boolDebug): Class constructor. The parameter boolHex configure the class to return de encripted/decripted data in hexadecimal(true) or in binary (false). The parameter boolDebug configure the class to show the debug information. Call the constructor without parameter is the same as AES128(false, false)
• makeKey(txtClave): Return the sub-keys to encrypt/decrypt data. The parameter txtClave is the cipher key (128 bits or 16 characters)
• blockEncrypt(txtDatos, arrayClave): Encrypt one data block with a length of 128 bits (16 characters). The parameter txtDatos is the data block to encrypt and the parameter arrayClave are the sub-keys to cipher maked with makeKey() function.
• blockDecrypt(txtDatos, arrayClave): Decrypt one data block with a length of 128 bits (16 characters). The parameter txtDatos is the data block to decrypt and the parameter arrayClave are the sub-keys to cipher maked with makeKey() function.
• self_test(): Checks the algorithm.

• Check:
  
    require_once('AES128.php');
    $aes=new AES128();
    $aes->self_test();
  
  
• Basic:This example crypt the string "0123456789abcdef" with the key "0123456789abcdef" and then decrypt it.
  
    require_once('AES128.php');
    $aes=new AES128();
    $key=$aes->makeKey("0123456789abcdef");
    $ct=$aes->blockEncrypt("0123456789abcdef", $key);
    $cpt=$aes->blockDecrypt($ct);
    echo("CipherText: $ct <br/> PlainText: $cpt <br/>");
  
  
• Hexadecimal out: This example crypt the string "0123456789abcdef" with the key "0123456789abcdef" . It show the data in hexadecimal
  
    require_once('AES128.php');
    $aes=new AES128(true);
    $key=$aes->makeKey("0123456789abcdef");
    $ct=$aes->blockEncrypt("0123456789abcdef", $key);
    echo("CipherText: $ct <br/>");
  
  
• Debug mode: This example shows all the steps to crypt/decrypt.
    require_once('AES128.php');
    $aes=new AES128(false, true);
    $key=$aes->makeKey("0123456789abcdef");
    $ct=$aes->blockEncrypt("0123456789abcdef", $key);
    $cpt=$aes->blockDecrypt($ct);
    echo("CipherText: $ct <br/> PlainText: $cpt <br/>");