Example of AES encryption and decryption in php _ php instance

Put the code first. There are two files: AES. php (aes algorithm file) and aesDemo. php (application instance file) aesDemo. php:

Example,

The Code is as follows:

Require_once ('./AES. php ');
// $ Aes = new AES ();
$ Aes = new AES (true); // stores encrypted strings in hexadecimal format.
// $ Aes = new AES (true, true); // The encrypted string is stored in hexadecimal format with debugging information
$ Key = "this is a 32 byte key"; // key
$ Keys = $ aes-> makeKey ($ key );
$ Encode = "123456"; // encrypted string
$ Ct = $ aes-> encryptString ($ encode, $ keys );
Echo "encode =". $ ct ."
";
$ Cpt = $ aes-> decryptString ($ ct, $ keys );
Echo "decode =". $ cpt;
?>

Example, AES Encryption Class

The Code is as follows:

// Php aes Encryption Class
Class AESMcrypt {

Public $ iv = null;
Public $ key = null;
Public $ bit = 128;
Private $ cipher;

Public function _ construct ($ bit, $ key, $ iv, $ mode ){
If (empty ($ bit) | empty ($ key) | empty ($ iv) | empty ($ mode ))
Return NULL;

$ This-> bit = $ bit;
$ This-> key = $ key;
$ This-> iv = $ iv;
$ This-> mode = $ mode;

Switch ($ this-> bit ){
Case 192: $ this-> cipher = MCRYPT_RIJNDAEL_192; break;
Case 256: $ this-> cipher = MCRYPT_RIJNDAEL_256; break;
Default: $ this-> cipher = MCRYPT_RIJNDAEL_128;
}

Switch ($ this-> mode ){
Case 'ecb ': $ this-> mode = MCRYPT_MODE_ECB; break;
Case 'cfb ': $ this-> mode = MCRYPT_MODE_CFB; break;
Case 'ofb': $ this-> mode = MCRYPT_MODE_OFB; break;
Case 'nofb ': $ this-> mode = MCRYPT_MODE_NOFB; break;
Default: $ this-> mode = MCRYPT_MODE_CBC;
}
}

Public function encrypt ($ data ){
$ Data = base64_encode (mcrypt_encrypt ($ this-> cipher, $ this-> key, $ data, $ this-> mode, $ this-> iv ));
Return $ data;
}

Public function decrypt ($ data ){
$ Data = mcrypt_decrypt ($ this-> cipher, $ this-> key, base64_decode ($ data), $ this-> mode, $ this-> iv );
$ Data = rtrim ($ data ),"..");
Return $ data;
}

}
// Usage
$ Aes = new AESMcrypt ($ bit = 128, $ key = 'abcdef1234567890', $ iv = '0987654321cba CBA ', $ mode = 'cbc ');
$ C = $ aes-> encrypt ('haowei. me ');
Var_dump ($ aes-> decrypt ($ c ));

Example: an encryption and decryption class

The Code is as follows:

/**
* AES encryption and decryption
* @ Author hushangming
*
* Usage:
*

* // Instantiate the class
* // Parameter $ _ bit: format, which can be 256, 192, or 128 bytes. The default value is 128 bytes.
* // Parameter $ _ type: encryption/Decryption mode. The options include cfb, cbc, nofb, ofb, stream, and ecb. The default value is ecb.
* // Parameter $ _ key: key. The default value is abcdefghijuklmno.
* $ Tcaes = new TCAES ();
* $ String = 'laohu ';
* // Encryption
* $ EncodeString = $ tcaes-> encode ($ string );
* // Decrypt
* $ DecodeString = $ tcaes-> decode ($ encodeString );
*

*/
Class TCAES {
Private $ _ bit = MCRYPT_RIJNDAEL_256;
Private $ _ type = MCRYPT_MODE_CBC;
// Private $ _ key = 'abcdefghijuklmno0123456789012345 ';
Private $ _ key = 'abcdefghijuklmno'; // key
Private $ _ use_base64 = true;
Private $ _ iv_size = null;
Private $ _ iv = null;

/**
* @ Param string $ _ key
* @ Param int $ _ bit 128 bytes by default
* @ Param string $ _ type encryption and decryption method
* @ Param boolean $ _ use_base64 uses base64 secondary encryption by default
*/
Public function _ construct ($ _ key = '', $ _ bit = 128, $ _ type = 'ecb ', $ _ use_base64 = true ){
// Encrypted byte
If (192 ==== _ bit ){
$ This-> _ bit = MCRYPT_RIJNDAEL_192;
} Elseif (128 ===$ _ bit ){
$ This-> _ bit = MCRYPT_RIJNDAEL_128;
} Else {
$ This-> _ bit = MCRYPT_RIJNDAEL_256;
}
// Encryption Method
If ('cfb '===$ _ type ){
$ This-> _ type = MCRYPT_MODE_CFB;
} Elseif ('cbc' ===$ _ type ){
$ This-> _ type = MCRYPT_MODE_CBC;
} Elseif ('nofb '===$ _ type ){
$ This-> _ type = MCRYPT_MODE_NOFB;
} Elseif ('ofb' ===$ _ type ){
$ This-> _ type = MCRYPT_MODE_OFB;
} Elseif ('stream' ===$ _ type ){
$ This-> _ type = MCRYPT_MODE_STREAM;
} Else {
$ This-> _ type = MCRYPT_MODE_ECB;
}
// Key
If (! Empty ($ _ key )){
$ This-> _ key = $ _ key;
}
// Whether to use base64
$ This-> _ use_base64 = $ _ use_base64;

$ This-> _ iv_size = mcrypt_get_iv_size ($ this-> _ bit, $ this-> _ type );
$ This-> _ iv = mcrypt_create_iv ($ this-> _ iv_size, MCRYPT_RAND );
}

/**
* Encryption
* @ Param string $ string the string to be encrypted
* @ Return string
*/
Public function encode ($ string ){
If (MCRYPT_MODE_ECB ===$ this-> _ type ){
$ EncodeString = mcrypt_encrypt ($ this-> _ bit, $ this-> _ key, $ string, $ this-> _ type );
} Else {
$ EncodeString = mcrypt_encrypt ($ this-> _ bit, $ this-> _ key, $ string, $ this-> _ type, $ this-> _ iv );
}
If ($ this-> _ use_base64)
$ EncodeString = base64_encode ($ encodeString );
Return $ encodeString;
}

/**
* Decryption
* @ Param string $ string to be decrypted
* @ Return string
*/
Public function decode ($ string ){
If ($ this-> _ use_base64)
$ String = base64_decode ($ string );

$ String = $ this-> toHexString ($ string );
If (MCRYPT_MODE_ECB ===$ this-> _ type ){
$ DecodeString = mcrypt_decrypt ($ this-> _ bit, $ this-> _ key, $ string, $ this-> _ type );
} Else {
$ DecodeString = mcrypt_decrypt ($ this-> _ bit, $ this-> _ key, $ string, $ this-> _ type, $ this-> _ iv );
}
Return $ decodeString;
}

/**
* Convert $ string to hexadecimal
* @ Param string $ string
* @ Return stream
*/
Private function toHexString ($ string ){
$ Buf = "";
For ($ I = 0; $ I <strlen ($ string); $ I ++ ){
$ Val = dechex (ord ($ string {$ I }));
If (strlen ($ val) <2)
$ Val = "0". $ val;
$ Buf. = $ val;
}
Return $ buf;
}

/**
* Convert the hexadecimal stream $ string to a string
* @ Param stream $ string
* @ Return string
*/
Private function fromHexString ($ string ){
$ Buf = "";
For ($ I = 0; $ I <strlen ($ string); $ I ++ = 2 ){
$ Val = chr (hexdec (substr ($ string, $ I, 2 )));
$ Buf. = $ val;
}
Return $ buf;
}
}