java使用AES加密,javaaes加密
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java使用AES加密,javaaes加密
java使用AES加密java使用AES加密
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- package com.jetsum.util;
- import java.security.InvalidAlgorithmParameterException;
- import java.security.InvalidKeyException;
- import java.security.NoSuchAlgorithmException;
- import java.security.SecureRandom;
- import java.security.spec.AlgorithmParameterSpec;
- 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.IvParameterSpec;
- /**
- * 通过AES算法对文本进行加密解密
- * @author ShaoJiang
- *
- */
- public class AESUtil {
- private static byte[] keyValue = new byte[] { //用户密钥
- 22,25,-35,-45,25,98,-55,-45,10,35,-45,25,
- 26,-95,25,-65,-78,-99,85,45,-62,10,-0,11,
- -35,48,-98,65,-32,14,-78,25,36,-56,-45,-45,
- 12,15,-35,-75,15,-14,62,-25,33,-45,55,68,-88
- };
- private static byte[] iv = new byte[] { //算法参数
- -12,35,-25,65,45,-87,95,-22,-15,45,55,-66,32,5-4,84,55
- };
- private static SecretKey key; //加密密钥
- private static AlgorithmParameterSpec paramSpec; //算法参数
- private static Cipher ecipher; //加密算法
- static{
- KeyGenerator kgen;
- try {
- //为指定算法生成一个密钥生成器对象。
- kgen = KeyGenerator.getInstance("AES");
- //使用用户提供的随机源初始化此密钥生成器,使其具有确定的密钥长度。
- kgen.init(128, new SecureRandom(keyValue));
- //使用KeyGenerator生成(对称)密钥。
- key = kgen.generateKey();
- //使用iv中的字节作为IV来构造一个 算法参数。
- paramSpec = new IvParameterSpec(iv);
- //生成一个实现指定转换的 Cipher 对象
- ecipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
- } catch (NoSuchAlgorithmException e) {
- e.printStackTrace();
- } catch (NoSuchPaddingException e) {
- e.printStackTrace();
- }
- }
- /**
- * 加密,使用指定数据源生成密钥,使用用户数据作为算法参数进行AES加密
- * @param msg 加密的数据
- * @return
- */
- public static String encrypt(String msg) {
- String str = "";
- try {
- //用密钥和一组算法参数初始化此 cipher
- ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
- //加密并转换成16进制字符串
- str = asHex(ecipher.doFinal(msg.getBytes()));
- } catch (BadPaddingException e) {
- e.printStackTrace();
- } catch (InvalidKeyException e) {
- e.printStackTrace();
- } catch (InvalidAlgorithmParameterException e) {
- e.printStackTrace();
- } catch (IllegalBlockSizeException e) {
- e.printStackTrace();
- }
- return str;
- }
- /**
- * 解密,对生成的16进制的字符串进行解密
- * @param value 解密的数据
- * @return
- */
- public static String decrypt(String value) {
- try {
- ecipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
- return new String(ecipher.doFinal(asBin(value)));
- } catch (BadPaddingException e) {
- e.printStackTrace();
- } catch (InvalidKeyException e) {
- e.printStackTrace();
- } catch (InvalidAlgorithmParameterException e) {
- e.printStackTrace();
- } catch (IllegalBlockSizeException e) {
- e.printStackTrace();
- }
- return "";
- }
- /**
- * 将字节数组转换成16进制字符串
- * @param buf
- * @return
- */
- private static String asHex(byte buf[]) {
- StringBuffer strbuf = new StringBuffer(buf.length * 2);
- int i;
- for (i = 0; i < buf.length; i++) {
- if (((int) buf[i] & 0xff) < 0x10)//小于十前面补零
- strbuf.append("0");
- strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
- }
- return strbuf.toString();
- }
- /**
- * 将16进制字符串转换成字节数组
- * @param src
- * @return
- */
- private static byte[] asBin(String src) {
- if (src.length() < 1)
- return null;
- byte[] encrypted = new byte[src.length() / 2];
- for (int i = 0; i < src.length() / 2; i++) {
- int high = Integer.parseInt(src.substring(i * 2, i * 2 + 1), 16);//取高位字节
- int low = Integer.parseInt(src.substring(i * 2 + 1, i * 2 + 2), 16);//取低位字节
- encrypted[i] = (byte) (high * 16 + low);
- }
- return encrypted;
- }
- }
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