[PHP] AES encryption----php Server and Android client

Last Update:2015-07-16 Source: Internet

Author: User

Tags decrypt mcrypt php server

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This article takes 128-bit AES-CBC mode encryption and decryption1. First install the MCrypt on the Server:<code>sudo apt-get install php5-mcrypt php5-dev</code>sudo php5enmod mcryptsudo service apache2 restart2.PHP service-side AES Encryption Class code<pre class="brush:php;gutter:true;">Class MCrypt {private $iv = ' fedcba9876543210 ';//initialization Vector IV public $KEY;//AES encrypted key key/ /transfer key $key into this class function __construct ($key) {$this->key= $key; }//cryptographic function Encrypt ($str) {//$key = $this->hex2bin ($key); $iv = $this->iv; $TD = Mcrypt_module_open (' rijndael-128 ', ', ' CBC ', $iv); Mcrypt_generic_init ($td, $this->key, $iv); $encrypted = Mcrypt_generic ($td, $str); \ocp\util::writelog (' ***mcrypt $key * * *, $this->key, \ocp\util::error); Mcrypt_generic_deinit ($td); Mcrypt_module_close ($td); return Bin2Hex ($encrypted); }//decryption function Decrypt ($code) {//$key = $this->hex2bin ($key); $code = $this->hex2bin ($code); $iv = $this->iv; $TD = MCrypt_module_open (' rijndael-128 ', ', ' CBC ', $iv); Mcrypt_generic_init ($td, $this->key, $iv); $decrypted = Mdecrypt_generic ($td, $code); Mcrypt_generic_deinit ($td); Mcrypt_module_close ($td); return Utf8_encode (trim ($decrypted)); } protected function Hex2bin ($hexdata) {$bindata = '; For ($i = 0; $i < strlen ($hexdata); $i + = 2) {$bindata. = chr (hexdec (substr ($hexdata, $i, 2))); } return $bindata; } }</pre>4.PHP Server calls the ASE encryption class Code:<pre><pre>$key= "";//add The AES key yourself // Pass the encrypted key into the AES class $mcryptnew mcrypt ($ Key); // AES encryption of passwords in the database $PSW $mcrypt->encrypt ();</pre></pre>5.Android service-side AES Decryption code:Create a Aesutil class in Android that needs to be called when<pre>/*** AES Decryption: * Decryption of the password sent back by the server **/Importjava.io.UnsupportedEncodingException;Importjava.security.MessageDigest;Importjava.security.NoSuchAlgorithmException;Importjavax.crypto.Cipher;Importjavax.crypto.NoSuchPaddingException;Importjavax.crypto.spec.IvParameterSpec;Importjavax.crypto.spec.SecretKeySpec;Importcom.pcloud.android.ui.activity.FirstAuthenActivity; public classAesutil {PrivateString IV = "fedcba9876543210";//the virtual Iv. And the service side to maintain consistency PrivateIvparameterspec ivspec; PrivateSecretkeyspec keyspec; PrivateCipher Cipher; //private String Secretkey = "";//the virtual keyString msgtoken=firstauthenactivity.msgtoken; //String msgurl=firstauthenactivity.msgurl;String msgrandom=firstauthenactivity.msgrandom; //take the random number and Tokenid to the MD5 operation as the AES key, and the service side of the AES encryption key to maintain consistencyString SECRETKEY=STRINGTOMD5 (msgtoken+msgrandom); publicaesutil () {ivspec=NewIvparameterspec (iv.getbytes ()); Keyspec=NewSecretkeyspec (secretkey.getbytes (), "AES"); Try{cipher= Cipher.getinstance ("aes/cbc/nopadding"); } Catch(nosuchalgorithmexception E) {//TODO auto-generated Catch blockE.printstacktrace (); } Catch(nosuchpaddingexception E) {//TODO auto-generated Catch blockE.printstacktrace (); } } public byte[] Encrypt (String Text)throwsException {if(text = =NULL|| Text.length () = = 0) Throw NewException ("Empty string"); byte[] encrypted =NULL; Try{cipher.init (cipher.encrypt_mode, keyspec, ivspec); Encrypted=cipher.dofinal (padstring (text). getBytes ()); } Catch(Exception E) {Throw NewException ("[encrypt]" +E.getmessage ()); } returnencrypted; } public byte[] Decrypt (String Code)throwsException {if(code = =NULL|| Code.length () = = 0) Throw NewException ("Empty string"); byte[] decrypted =NULL; Try{cipher.init (cipher.decrypt_mode, keyspec, ivspec); Decrypted=cipher.dofinal (hextobytes (code)); } Catch(Exception E) {Throw NewException ("[decrypt]" +E.getmessage ()); } returndecrypted; } public StaticString Bytestohex (byte[] Data) { if(data==NULL) { return NULL; } intLen =data.length; String Str= ""; for(inti=0; i<len; i++) { if((data[i]&0xff) <16) Str= str + "0" + java.lang.Integer.toHexString (data[i]&0xff); ElseStr= str + java.lang.Integer.toHexString (data[i]&0xff); } returnstr; } public Static byte[] hextobytes (String str) {if(str==NULL) { return NULL; } Else if(str.length () < 2) { return NULL; } Else { intLen = Str.length ()/2; byte[] buffer =New byte[len]; for(inti=0; i<len; i++) {buffer[i]= (byte) Integer.parseint (str.substring (i*2,i*2+2), 16); } returnbuffer; } } Private Staticstring padstring (string source) {CharPaddingchar = ' '; intsize = 16; intx = Source.length ()%size; intPadlength = size-x; for(inti = 0; I < padlength; i++) {source+=paddingchar; } returnsource; }</pre>The 6.Android client calls the AES class for decryption:<pre><pre>// invoke AES Decryption aesutil mcrypt; New aesutil (); Try { // AES Decryption of received password new String (mcrypt.decrypt (rec[1])); LOG.D ("decrypted:", decrypted); Catch (Exception e) { // TODO auto-generated catch block e.printstacktrace (); }</pre></pre> [php]aes Encrypted----PHP Server and Android client

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