Java encryption AES symmetric encryption algorithm

[AES]

A symmetric encryption algorithm, used by DES.

For more information about encryption, see Java encryption and decryption symmetric encryption algorithm asymmetric encryption algorithm MD5 BASE64 AES RSA

[Code]

There are many codes. Some of them are not the content code of this Article. Let's take a look at them for details.

Package com. uikoo9.util. encrypt; import java. math. bigInteger; import java. security. messageDigest; import java. security. secureRandom; import javax. crypto. cipher; import javax. crypto. keyGenerator; import javax. crypto. spec. secretKeySpec; import sun. misc. BASE64Decoder; import sun. misc. BASE64Encoder; import com. uikoo9.util. QStringUtil;/*** encoding tool class * 1. convert byte [] to a variety of hexadecimal strings * 2. base 64 encode * 3. base 64 decode * 4. obtain Md5 value of byte [] * 5. obtain the md5 value of the string * 6. use base64 to implement md5 encryption * 7. AES encryption * 8. AES encrypted to base 64 code * 9. AES decryption * 10. decrypt base 64 code AES * @ author uikoo9 * @ version 0.0.7.20140601 */public class QEncodeUtil {public static void main (String [] args) throws Exception {String content = "I Love You"; System. out. println ("before encryption:" + content); String key = "123456"; System. out. println ("encryption key and decryption key:" + key); String encrypt = aesEncrypt (content, Key); System. out. println ("encrypted:" + encrypt); String decrypt = aesDecrypt (encrypt, key); System. out. println ("decrypted:" + decrypt );} /*** convert byte [] into various hexadecimal strings * @ param bytes byte [] * @ param radix can be converted to the hexadecimal range from Character. MIN_RADIX to Character. MAX_RADIX, which goes out of the range and becomes a 10-digit * @ return converted String */public static String binary (byte [] bytes, int radix) {return new BigInteger (1, bytes ). toString (radix); // here 1 represents a positive number}/*** base 64 encode * @ Param bytes the byte [] * @ return encoded base 64 code */public static String base64Encode (byte [] bytes) {return new BASE64Encoder (). encode (bytes );} /*** base 64 decode * @ param base64Code base 64 code * @ return decoded byte [] * @ throws Exception */public static byte [] base64Decode (String base64Code) throws Exception {return QStringUtil. isEmpty (base64Code )? Null: new BASE64Decoder (). decodeBuffer (base64Code );} /*** get the md5 value of byte [] * @ param bytes byte [] * @ return md5 * @ throws Exception */public static byte [] md5 (byte [] bytes) throws Exception {MessageDigest md = MessageDigest. getInstance ("MD5"); md. update (bytes); return md. digest ();}/*** get String md5 value * @ param msg * @ return md5 * @ throws Exception */public static byte [] md5 (String msg) throws Exception {ret Urn QStringUtil. isEmpty (msg )? Null: md5 (msg. getBytes ());} /*** implement md5 encryption with base64 * @ param msg String to be encrypted * @ return convert md5 to base64 * @ throws Exception */public static String md5Encrypt (String msg) throws Exception {return QStringUtil. isEmpty (msg )? Null: base64Encode (md5 (msg ));} /*** AES encryption ** @ param content to be encrypted * @ param encryptKey encryption key * @ return encrypted byte [] * @ throws Exception */public static byte [] aesEncryptToBytes (String content, string encryptKey) throws Exception {KeyGenerator kgen = KeyGenerator. getInstance ("AES"); kgen. init (128, new SecureRandom (encryptKey. getBytes (); Cipher cipher = Cipher. getInstance ("AES"); cipher. init (Cipher. ENCR YPT_MODE, new SecretKeySpec (kgen. generateKey (). getEncoded (), "AES"); return cipher. doFinal (content. getBytes ("UTF-8 "));} /*** encrypted AES to base 64 code * @ param content to be encrypted * @ param encryptKey encryption key * @ return encrypted base 64 code * @ throws Exception */public static String aesEncrypt (String content, string encryptKey) throws Exception {return base64Encode (aesEncryptToBytes (content, encryptKey);}/*** AES decryption * @ Param encryptBytes byte [] * @ param decryptKey decryption key * @ return decrypted String * @ throws Exception */public static String aesdecryptbytes (byte [] encryptBytes, string decryptKey) throws Exception {KeyGenerator kgen = KeyGenerator. getInstance ("AES"); kgen. init (128, new SecureRandom (decryptKey. getBytes (); Cipher cipher = Cipher. getInstance ("AES"); cipher. init (Cipher. DECRYPT_MODE, new SecretKeySpec (k Gen. generateKey (). getEncoded (), "AES"); byte [] decryptBytes = cipher. doFinal (encryptBytes); return new String (decryptBytes );} /*** decrypt base 64 code AES * @ param encryptStr base 64 code to be decrypted * @ param decryptKey decryption key * @ return the decrypted string * @ throws Exception */public static String aesDecrypt (String encryptStr, string decryptKey) throws Exception {return QStringUtil. isEmpty (encryptStr )? Null: aesdecryptbytes (base64Decode (encryptStr), decryptKey );}}

[Output]

Before encryption: I love your encryption key and decryption key: 123456 after encryption: A63fa7DjAe3yYji44BTm1g = after decryption: I love you