Android des aes MD5 Encryption

Android des aes MD5 Encryption

AES encryption:

 

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 * content to be encrypted * @ param password * encryption 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 a secret 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 * content to be decrypted * @ param password * decryption key * @ return */public static byte [] decrypt (byte [] 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 a 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 hexadecimal ** @ param buf * @ return */public static String parseByte2HexStr (byte buf []) {StringBuffer sb = new StringBuffer (); 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 the hexadecimal format to the decimal format ** @ 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 DES encryption:
 
 
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, randomly filled with private static byte [] iv = {1, 2, 3, 4, 5, 6, 7, 8 }; /*** @ param encryptString * plaintext to be encrypted * @ param encryptKey * Key * @ return encrypted ciphertext * @ throws Exception */public static String encryptDES (String encryptString, string encryptKey) throws Exception {// instantiate the IvParameterSpec object and use the specified initialization vector IvParameterSpec zeroIv = new IvParameterSpec (iv); // instantiate the SecretKeySpec class, construct SecretKeySecretKeySpec key = new SecretKeySpec (encryptKey. getBytes (), DES); // create a Cipher cipher Cipher = Cipher. getInstance (DES/CBC/PKCS5Padding); // use the key to initialize the Cipher object cipher. init (Cipher. ENCRYPT_MODE, key, zeroIv); // perform the encryption 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 decrypString, String decryptKey) throws Exception {byte [] byteMi = Base64.decode (decrypString, Base64.DEFAULT); // instantiate the IvParameterSpec object and use the specified initialization vector IvParameterSpec zeroIv = new IvParameterSpec (iv ); // instantiate the SecretKeySpec class and construct SecretKeySecretKeySpec key = new SecretKeySpec (decryptKey. getBytes (), DES); // create a Cipher cipher Cipher = Cipher. getInstance (DES/CBC/PKCS5Padding); // use the key to initialize the Cipher object cipher. init (Cipher. DECRYPT_MODE, key, zeroIv); // execute the decryption operation byte [] decryptedData = cipher. doFinal (byteMi); return new String (decryptedData );}}
MD5 encryption:
 
 
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 MessageDigest algorithm = MessageDigest whose Digest algorithm is MD5. getInstance (MD5); // reset the Digest to use algorithm again. reset (); // use bytes to update the abstract algorithm. update (data. getBytes (); // use the specified byte array to update the abstract. Then, the return toHexString (algorithm. digest (),);} catch (NoSuchAlgorithmException e) {// catch Block e automatically generated by TODO. printStackTrace () ;}return ;}// convert each character in the String to a hexadecimal private static String toHexString (byte [] bytes, String separator) {StringBuilder hexstring = new StringBuilder (); for (byte B: bytes) {String hex = Integer. toHexString (0xFF & B); if (hex. length () = 1) {hexstring. append ('0');} hexstring. append (hex);} return hexstring. toString ();}}

Test file:
 
 
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 () {// The specified key can only be 8-Bit String key = 12345678; // specify the number of plaintext String text to be encrypted; Log. I (DES, DES encryption plaintext: + text + encryption key: + key); // call DES encryption try {String encryptResult = DES. encryptDES (text, key); String decryptResult = DES. decryptDES (encryptResult, key); TV. setText (encryption result: + encryptResult + decryption result: + decryptResult); Log. I (DES, encryption result: + encryptResult + decryption result: + decryptResult);} catch (Exception e) {// catch Block e automatically generated by TODO. printStackTrace () ;}} private void AESTest () {String content = test3444; String password = 11; // encrypt byte [] encryptResult = AES. encrypt (content, password); String encryptResultStr = AES. parseByte2HexStr (encryptResult); // decrypt byte [] decryptFrom = AES. parseHexStr2Byte (encryptResultStr); String decryptResult = new String (AES. decrypt (decryptFrom, password); Log. I (AES, password: + password + before encryption: + content + after encryption: + encryptResultStr + after decryption: + decryptResult); TV. setText (password: + password + pre-encryption: + content + after encryption: + encryptResultStr + after decryption: + decryptResult);} private void MD5Test () {String str = 1nakjnvjanbdvjk, female guest, Region v pride cannot be wasted. v pride cannot be wasted. v convenience cannot be wasted. vu Bagua v Arabic Style v; string MD5Result = MD5.toMD5 (str); Log. I (MD5, str + MD5 encryption result: + MD5Result); TV. setText (str + MD5 encryption result: + MD5Result );}}