本文共 3320 字,大约阅读时间需要 11 分钟。
- 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;
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- public class AESUtil {
- private static byte[] keyValue = new byte[] {
- 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[] {
- -12,35,-25,65,45,-87,95,-22,-15,45,55,-66,32,5-4,84,55
- };
- private static SecretKey key;
- private static AlgorithmParameterSpec paramSpec;
- private static Cipher ecipher;
-
- static{
- KeyGenerator kgen;
- try {
-
- kgen = KeyGenerator.getInstance("AES");
-
- kgen.init(128, new SecureRandom(keyValue));
-
- key = kgen.generateKey();
-
- paramSpec = new IvParameterSpec(iv);
-
- ecipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
- } catch (NoSuchAlgorithmException e) {
- e.printStackTrace();
- } catch (NoSuchPaddingException e) {
- e.printStackTrace();
- }
- }
-
-
-
-
-
-
- public static String encrypt(String msg) {
- String str = "";
- try {
-
- ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
-
- 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;
- }
-
-
-
-
-
-
- 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 "";
- }
-
-
-
-
-
-
- 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)
- strbuf.append("0");
- strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
- }
- return strbuf.toString();
- }
-
-
-
-
-
-
- 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);
- int low = Integer.parseInt(src.substring(i * 2 + 1, i * 2 + 2), 16);
- encrypted[i] = (byte) (high * 16 + low);
- }
- return encrypted;
- }
- }
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