PHP, Java des encryption and decryption instances, DES Encryption and decryption _php tutorial

PHP, Java des encryption and decryption instances, DES encryption and decryption

Des encryption is a symmetric encryption in the Internet application of a more than one encryption method, PHP through the MCrypt extension library to support DES encryption, to use DES Encryption in PHP, the need to first install the MCrypt extension Library

The following is an instance of encrypted decryption
Copy the Code code as follows:
$iv _size = mcrypt_get_iv_size (mcrypt_rijndael_256, MCRYPT_MODE_ECB);
$iv = Mcrypt_create_iv ($iv _size, Mcrypt_rand);
$key = "This is a very secret key";//Key
$text = "Meet me at one o ' clock behind the monument."; /content that needs to be encrypted
Echo ($text). "\ n";

$crypttext =base64_encode (Mcrypt_encrypt (mcrypt_rijndael_256, $key, $text, MCRYPT_MODE_ECB, $iv));
Echo $crypttext. "\ n";//post-encrypted content

Echo Mcrypt_decrypt (mcrypt_rijndael_256, $key, Base64_decode ($crypttext), MCRYPT_MODE_ECB, $IV);//decrypted content

In the AES encryption algorithm usually uses the mcrypt_rijndael_128, mcrypt_rijndael_192, mcrypt_rijndael_256 three kinds, the latter 128, 192, 256 for the secret key (that is, the encryption key) is how many bits, such as using mcrypt_rijndael_128, then use this algorithm to encrypt the secret key length is 128bit, such as $key = ' fjjda0&9^$$#+*%$ Fada ', is 20 characters, that in the actual encryption only use the first 16 character encryption (16*8=128), less than 128bit PHP will use ' "".

Sometimes do project docking time, you may use PHP encryption, and the other side is written by Java, docking the process of the discovery machine after the encryption of the content of the other side can not decrypt, this is because PHP and Java in the implementation of this algorithm when there is a difference, to the right encryption and decryption need to do both sides of the processing:

Php:
Copy CodeThe code is as follows:
<?php
Class Security {
public static function Encrypt ($input, $key) {
$size = Mcrypt_get_block_size (mcrypt_rijndael_128, MCRYPT_MODE_ECB);
$input = Security::p kcs5_pad ($input, $size);
$TD = Mcrypt_module_open (mcrypt_rijndael_128, ', MCRYPT_MODE_ECB, ');
$iv = Mcrypt_create_iv (Mcrypt_enc_get_iv_size ($TD), Mcrypt_rand);
Mcrypt_generic_init ($TD, $key, $IV);
$data = Mcrypt_generic ($TD, $input);
Mcrypt_generic_deinit ($TD);
Mcrypt_module_close ($TD);
$data = Base64_encode ($data);
return $data;
}

private static function Pkcs5_pad ($text, $blocksize) {
$pad = $blocksize-(strlen ($text)% $blocksize);
Return $text. Str_repeat (Chr ($pad), $pad);
}

public static function Decrypt ($SSTR, $sKey) {
$decrypted = Mcrypt_decrypt (
mcrypt_rijndael_128,
$sKey,
Base64_decode ($SSTR),
Mcrypt_mode_ecb
);

$dec _s = strlen ($decrypted);
$padding = Ord ($decrypted [$dec _s-1]);
$decrypted = substr ($decrypted, 0,-$padding);
return $decrypted;
}
}



$key = "1234567891234567";
$data = "Example";

$value = Security::encrypt ($data, $key);
echo $value. '
';
echo Security::d ecrypt ($value, $key);

Java:
Copy CodeThe code is as follows:
Import Javax.crypto.Cipher;
Import Javax.crypto.spec.SecretKeySpec;

Import org.apache.commons.codec.binary.Base64;

public class Security {
public static string encrypt (string input, string key) {
byte[] crypted = null;
try{
Secretkeyspec skey = new Secretkeyspec (Key.getbytes (), "AES");
Cipher Cipher = cipher.getinstance ("aes/ecb/pkcs5padding");
Cipher.init (Cipher.encrypt_mode, skey);
crypted = Cipher.dofinal (Input.getbytes ());
}catch (Exception e) {
System.out.println (E.tostring ());
}
return new String (Base64.encodebase64 (crypted));
}

public static string decrypt (string input, string key) {
byte[] output = null;
try{
Secretkeyspec skey = new Secretkeyspec (Key.getbytes (), "AES");
Cipher Cipher = cipher.getinstance ("aes/ecb/pkcs5padding");
Cipher.init (Cipher.decrypt_mode, skey);
Output = cipher.dofinal (base64.decodebase64 (input));
}catch (Exception e) {
System.out.println (E.tostring ());
}
return new String (output);
}

public static void Main (string[] args) {
String key = "1234567891234567";
String data = "Example";

System.out.println (Security.encrypt (data, key));

System.out.println (Security.decrypt (Security.encrypt (data, key), key));


}
}

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