Android DES AES MD5 Encryption

AES Encryption:

<span style= "FONT-SIZE:18PX;" >package Com.example.encrypdate.util;import Java.io.unsupportedencodingexception;import Java.security.invalidkeyexception;import Java.security.nosuchalgorithmexception;import Java.security.securerandom;import Javax.crypto.badpaddingexception;import Javax.crypto.cipher;import Javax.crypto.illegalblocksizeexception;import Javax.crypto.keygenerator;import Javax.crypto.nosuchpaddingexception;import Javax.crypto.secretkey;import Javax.crypto.spec.secretkeyspec;public  Class AES {/** * encryption * * @param content * requires encrypted contents * @param password * encrypted password * @return */public static Byte[] Encrypt (string content, string password) {try {keygenerator KGen = keygenerator.getinstance ("AES"); Kgen.init (128 , New SecureRandom (Password.getbytes ())); Secretkey Secretkey = Kgen.generatekey (); byte[] Encodeformat = secretkey.getencoded (); Secretkeyspec key = new Secretkeyspec (Encodeformat, "AES"); Cipher Cipher = cipher.getinstance ("AES");//Create cipher byte[] Bytecontent = Content.getbytes ("Utf-8"); Cipher.init (Cipher.encrypt_mode, key);//Initialize byte[] result = cipher.dofinal (bytecontent); return result; Encryption} catch (NoSuchAlgorithmException e) {e.printstacktrace ();} catch (Nosuchpaddingexception e) {e.printstacktrace ();} catch (InvalidKeyException e) {e.printstacktrace ();} catch (Unsupportedencodingexception e) {e.printstacktrace ();} catch (Illegalblocksizeexception e) {e.printstacktrace ();} catch (Badpaddingexception e) {e.printstacktrace ();} return null;} /** * Decrypt * * @param content * to decrypt contents * @param password * Decryption key * @return */public static byte[] Decry PT (byte[] content, String password) {try {keygenerator KGen = keygenerator.getinstance ("AES"); Kgen.init (+), new SecureRandom (Password.getbytes ())); Secretkey Secretkey = Kgen.generatekey (); byte[] Encodeformat = secretkey.getencoded (); Secretkeyspec key = new Secretkeyspec (Encodeformat, "AES"); Cipher Cipher = cipher.getinstance ("AES");//Create cipher Cipher.init (Cipher.decrypt_mode, key);//Initialize BYte[] result = cipher.dofinal (content); return result; Encryption} catch (NoSuchAlgorithmException e) {e.printstacktrace ();} catch (Nosuchpaddingexception e) {e.printstacktrace ();} catch (InvalidKeyException e) {e.printstacktrace ();} catch (Illegalblocksizeexception e) {e.printstacktrace ();} catch ( Badpaddingexception e) {e.printstacktrace ();} return null;} /** * Convert Decimal to 16 binary * * @param buf * @return */public static String parsebyte2hexstr (byte buf[]) {stringbuffer sb = new STR Ingbuffer (); for (int i = 0; i < buf.length; i++) {String hex = integer.tohexstring (Buf[i] & 0xFF); if (Hex.length () = = 1) {hex = ' 0 ' + hex;} Sb.append (Hex.touppercase ());} return sb.tostring ();}  /** * Convert 16 binary to decimal * * @param hexstr * @return */public static byte[] Parsehexstr2byte (String hexstr) {if (Hexstr.length () < 1) return null;byte[] result = new Byte[hexstr.length ()/2];for (int i = 0; i < hexstr.length ()/2; i++) {int hi GH = Integer.parseint (hexstr.substring (i * 2, I * 2 + 1); int low = Integer.parsEint (Hexstr.substring (i * 2 + 1, I * 2 + 2),); Result[i] = (byte) (high * + low);} return result;}} </span>

des encryption:

<span style= "FONT-SIZE:18PX;" >package Com.example.encrypdate.util;import Javax.crypto.cipher;import Javax.crypto.spec.IvParameterSpec; Import Javax.crypto.spec.secretkeyspec;import Android.util.base64;public class DES {//initialization vector, random fill of private static byte[] IV = {1, 2, 3, 4, 5, 6, 7, 8};/** * @param encryptstring * require encrypted plaintext * @param encryptkey * keys * @ret Urn Encrypted ciphertext * @throws Exception */public static string Encryptdes (String encryptstring, String encryptkey) throws Exception {//Instantiate the Ivparameterspec object, use the specified initialization vector ivparameterspec ZEROIV = new Ivparameterspec (iv);//Instantiate the Secretkeyspec class, Constructs Secretkeysecretkeyspec key = new Secretkeyspec (Encryptkey.getbytes (), "DES") based on a byte array;//create cipher cipher cipher = Cipher.getinstance ("des/cbc/pkcs5padding");//Initialize Cipher object Cipher.init (Cipher.encrypt_mode, Key, ZEROIV) with secret key;// Perform cryptographic operation byte[] EncryptedData = cipher.dofinal (Encryptstring.getbytes ()); return base64.encodetostring (EncryptedData, Base64.default);}          /**** * * @param decrypstring *  Ciphertext * @param decryptkey * Decryption key * @return * @throws Exception */public static string Decryptdes (String decrypst Ring, String Decryptkey) throws Exception {byte[] Bytemi = Base64.decode (decrypstring, Base64.default);// Instantiates a Ivparameterspec object, using the specified initialization vector ivparameterspec ZEROIV = new Ivparameterspec (iv);//Instantiate the Secretkeyspec class, Constructs Secretkeysecretkeyspec key = new Secretkeyspec (Decryptkey.getbytes (), "DES") based on a byte array;//create cipher cipher cipher = Cipher.getinstance ("des/cbc/pkcs5padding");//Initialize Cipher object Cipher.init (Cipher.decrypt_mode, Key, ZEROIV) with secret key;// Perform decryption operation byte[] Decrypteddata = cipher.dofinal (Bytemi); return new String (Decrypteddata);}} </span>

MD5 Encryption:

<span style= "FONT-SIZE:18PX;" >package Com.example.encrypdate.util;import Java.security.messagedigest;import Java.security.nosuchalgorithmexception;public class MD5 {/*** * @param data * @return */public static string ToMD5 (string Data) {try {//Instantiate a MessageDigest object that specifies the digest algorithm as MD5 messagedigest algorithm = messagedigest.getinstance ("MD5");// Reset the summary for Reuse Algorithm.reset ();//Use bytes to update the digest Algorithm.update (Data.getbytes ());//Use the specified byte array to update the digest most, Then complete the summary to calculate return tohexstring (Algorithm.digest (), ""); catch (NoSuchAlgorithmException e) {//TODO auto-generated catch block E.printstacktrace ();} Return "";} Converts each character in a string to a hexadecimal private static string tohexstring (byte[] bytes, string separator) {StringBuilder hexstring = new Strin Gbuilder (); for (byte b:bytes) {String hex = integer.tohexstring (0xFF & B); if (hex.length () = = 1) {hexstring.append (' 0 ');} Hexstring.append (hex);} return hexstring.tostring ();}} </span>

Test file:

<span style= "FONT-SIZE:18PX;" >package Com.example.encrypdate;import Com.example.encrypdate.util.aes;import Com.example.encrypdate.util.DES; Import Android.os.bundle;import android.app.activity;import Android.util.log;import Android.widget.textview;import Com.example.encrypdate.util.md5;public class Mainactivity extends Activity {private TextView TV; @Overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (r.layout.activity_ Main); TV = (TextView) This.findviewbyid (r.id.tv);//Destest ();//Md5test (); Aestest ();} public void Destest () {//Specifies that the key can only be a 8-bit string key = "12345678";//Specifies the plaintext string text = "How much" that needs to be encrypted; LOG.I ("des", "des cipher plaintext:" + text + "\ n Encryption Key:" + key);//Call DES encryption try {String Encryptresult = des.encryptdes (text, key); String Decryptresult = Des.decryptdes (Encryptresult, key); Tv.settext ("Encrypted result:" + Encryptresult + "\ nthe decryption Result:" + Decryptresult ); LOG.I ("DES", "Encrypted result:" + Encryptresult + "\ n decryption Result:" + Decryptresult);} catch (Exception e) {//TODO auto-generated Catch block E.printstacktrace ();}} private void Aestest () {String content = "test3444"; String Password = "11";//encryption byte[] Encryptresult = aes.encrypt (content, password); String encryptresultstr = Aes.parsebyte2hexstr (Encryptresult);//decryption byte[] Decryptfrom = Aes.parsehexstr2byte ( ENCRYPTRESULTSTR); String decryptresult = new String (Aes.decrypt (decryptfrom, password)); LOG.I ("AES", "Password:" + password + "\ n" before encryption: "+ content +" \ n after encryption: "+ encryptresultstr +" \ n decrypted: "+ Decryptresult); Tv.settext (" Password : "+ password +" \ n before encryption: "+ content +" \ n after encryption: "+ encryptresultstr +" \ n decrypted: "+ Decryptresult);} private void Md5test () {String str = "1NAKJNVJANBDVJK female guest that lease V Pride can't be wasted where convenient v Ah don't v pride can't waste where convenient v Ah don't v pride can't waste where convenient v ah don't waste vu Lou disease v Arabian Wind V "; String Md5result = md5.tomd5 (str); LOG.I ("MD5", str + "MD5 encryption Result:" + Md5result); Tv.settext (str + "MD5 encryption Result:" + Md5result);}} </span>

Complete Project Address:

http://download.csdn.net/detail/u014071669/7930951

Android DES AES MD5 Encryption