Java实现简单AES RSA加密

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package com.lutai.util;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.NoSuchPaddingException;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.ObjectOutputStream;import java.security.*;/** * CipherUtil * * @author FD * @date 2016/5/21 */public class CipherUtil {    private static final int KEY_SIZE = 512;    public static Key getSecretKey() {        try {            KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");            SecureRandom secureRandom = new SecureRandom();            keyGenerator.init(secureRandom);            Key key = keyGenerator.generateKey();            return key;        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();            return null;        }    }    public static String encrypt(Key key, String text) {        int mode = Cipher.ENCRYPT_MODE;        try {            Cipher cipher = Cipher.getInstance("AES");            cipher.init(mode, key);            int blockSize = cipher.getBlockSize();            byte[] inBytes = text.getBytes();            byte[] outBytes = cipher.doFinal(inBytes);            return new BASE64Encoder().encode(outBytes);        } catch (Exception e) {            e.printStackTrace();            return "";        }    }    public static String decrypt(Key key, String text) {        int mode = Cipher.DECRYPT_MODE;        try {            Cipher cipher = Cipher.getInstance("AES");            cipher.init(mode, key);            int blockSize = cipher.getBlockSize();            byte[] inBytes = new BASE64Decoder().decodeBuffer(text);            byte[] outBytes = cipher.doFinal(inBytes);            return new String(outBytes);        } catch (Exception e) {            e.printStackTrace();            return "";        }    }    public static KeyPair getRSAKey() {        try {            KeyPairGenerator pairGenerator = KeyPairGenerator.getInstance("RSA");            SecureRandom secureRandom = new SecureRandom();            pairGenerator.initialize(KEY_SIZE, secureRandom);            KeyPair keyPair = pairGenerator.generateKeyPair();            return keyPair;        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();            return null;        }    }    public static String encryptPublicKey(KeyPair keyPair, Key key, String text) {        try {            Cipher cipher = Cipher.getInstance("RSA");            cipher.init(Cipher.WRAP_MODE, keyPair.getPublic());            byte[] keyBytes = cipher.wrap(key);            byte[] inBytes = text.getBytes();            cipher = Cipher.getInstance("AES");            cipher.init(Cipher.ENCRYPT_MODE, key);            ByteArrayOutputStream os = new ByteArrayOutputStream();            os.write(keyBytes.length);            System.out.println(keyBytes.length+"XXXXX");            os.write(keyBytes);            os.write(inBytes);            byte[] outBytes = cipher.doFinal(os.toByteArray());            return new BASE64Encoder().encode(outBytes);        } catch (Exception e) {            e.printStackTrace();            return "";        }    }    public static String decryptPublicKey(KeyPair keyPair, String text) {        try {            Cipher cipher = Cipher.getInstance("RSA");            cipher.init(Cipher.UNWRAP_MODE, keyPair.getPrivate());            byte[] inBytes = new BASE64Decoder().decodeBuffer(text);            ByteArrayInputStream is = new ByteArrayInputStream(inBytes);            int length = is.read();            byte[] keyBytes = new byte[length];            is.read(keyBytes, 0, length);            System.out.println(length+"XXX");            Key key = cipher.unwrap(keyBytes, "AES", Cipher.SECRET_KEY);            cipher = Cipher.getInstance("AES");            cipher.init(Cipher.DECRYPT_MODE, key);            byte[] outBytes = new byte[is.available()];            is.read(outBytes);            return new String(outBytes);        } catch (Exception e) {            e.printStackTrace();            return "";        }    }    public static void main(String[] args) {//        Key key =  getSecretKey();//        String text = "fengdui";//        String encode = encrypt(key, text);//        System.out.println(encode);//        String decode = decrypt(key, encode);//        System.out.println(decode);        KeyPair keyPair = getRSAKey();        Key key = getSecretKey();        String text = "fengdui";        String encode = encryptPublicKey(keyPair, key, text);        System.out.println(encode);        String decode = decryptPublicKey(keyPair, encode);        System.out.println(decode);    }}
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