Android中ASE加密算法工具类

package com.m520it.jdmall.util;import java.security.SecureRandom;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;public class AESUtils { public static final String KEY = "1234567891234567"; public static String encrypt(String src) throws Exception {  byte[] rawKey = getRawKey(KEY.getBytes());  byte[] result = encrypt(rawKey, src.getBytes());  return toHex(result); } public static String decrypt(String encrypted) throws Exception {  byte[] rawKey = getRawKey(KEY.getBytes());  byte[] enc = toByte(encrypted);  byte[] result = decrypt(rawKey, enc);  return new String(result); } private static byte[] getRawKey(byte[] seed) throws Exception {  KeyGenerator kgen = KeyGenerator.getInstance("AES");  // SHA1PRNG 强随机种子算法, 要区别4.2以上版本的调用方法  SecureRandom sr = null;  if (android.os.Build.VERSION.SDK_INT > android.os.Build.VERSION_CODES.JELLY_BEAN) {   sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");  } else {   sr = SecureRandom.getInstance("SHA1PRNG");  }  sr.setSeed(seed);  kgen.init(256, sr); // 256 bits or 128 bits,192bits  SecretKey skey = kgen.generateKey();  byte[] raw = skey.getEncoded();  return raw; } private static byte[] encrypt(byte[] key, byte[] src) throws Exception {  SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");  Cipher cipher = Cipher.getInstance("AES");  cipher.init(Cipher.ENCRYPT_MODE, skeySpec);  byte[] encrypted = cipher.doFinal(src);  return encrypted; } private static byte[] decrypt(byte[] key, byte[] encrypted)   throws Exception {  SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");  Cipher cipher = Cipher.getInstance("AES");  cipher.init(Cipher.DECRYPT_MODE, skeySpec);  byte[] decrypted = cipher.doFinal(encrypted);  return decrypted; } public static String toHex(String txt) {  return toHex(txt.getBytes()); } public static String fromHex(String hex) {  return new String(toByte(hex)); } public static byte[] toByte(String hexString) {  int len = hexString.length() / 2;  byte[] result = new byte[len];  for (int i = 0; i < len; i++)   result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2),     16).byteValue();  return result; } public static String toHex(byte[] buf) {  if (buf == null)   return "";  StringBuffer result = new StringBuffer(2 * buf.length);  for (int i = 0; i < buf.length; i++) {   appendHex(result, buf[i]);  }  return result.toString(); } private final static String HEX = "0123456789ABCDEF"; private static void appendHex(StringBuffer sb, byte b) {  sb.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f)); }}