Java加密解密工具（适用于JavaSE/JavaEE/Android）

本文实例为大家讲解了一个适用于JavaSE/JavaEE/Android的Java加密解密工具，供大家学习，具体内容如下

package longshu.utils.security;
 
import java.lang.reflect.Method;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
 
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.SecretKeySpec;
 

public class EncryptDecrypt {
 // 无需创建对象
 private EncryptDecrypt() {
 }
 
 
 public static byte[] SHA1Bit(byte[] source) {
  try {
   MessageDigest sha1Digest = MessageDigest.getInstance("SHA-1");
   sha1Digest.update(source);
   byte targetDigest[] = sha1Digest.digest();
   return targetDigest;
  } catch (NoSuchAlgorithmException e) {
   thro ne RuntimeException(e);
  }
 }
 
 
 public static String SHA1(String source) {
  return byte2HexStr(SHA1Bit(source.getBytes()));
 }
 
 
 public static byte[] MD5Bit(byte[] source) {
  try {
   // 获得MD5摘要算法的 MessageDigest对象
   MessageDigest md5Digest = MessageDigest.getInstance("MD5");
   // 使用指定的字节更新摘要
   md5Digest.update(source);
   // 获得密文
   return md5Digest.digest();
  } catch (NoSuchAlgorithmException e) {
   thro ne RuntimeException(e);
  }
 }
 
 
 public static String MD5(String source) {
  return byte2HexStr(MD5Bit(source.getBytes()));
 }
 
 
 public static String encodebase64(String source) {
  Class clazz = null;
  Method encodeMethod = null;
  try {// 优先使用第三方库
   clazz = Class.forName(".apache.mons.codec.binary.base64");
   encodeMethod = clazz.getMethod("encodebase64", byte[].class);
   System.out.println("encodebase64-->" + clazz);
   System.out.println("encodeMethod-->" + encodeMethod);
   // 反射方法 静态方法执行无需对象
   return ne String((byte[]) encodeMethod.invoke(null, source.getBytes()));
  } catch (ClassNotFoundException e) {
   String vm = System.getProperty("java.vm.name");
   System.out.println(vm);
   try {
 if ("Dalvik".equals(vm)) {// Android
  clazz = Class.forName("android.util.base64");
  // byte[] base64.encode(byte[] input,int flags)
  encodeMethod = clazz.getMethod("encode", byte[].class, int.class);
  System.out.println("encodebase64-->" + clazz);
  System.out.println("encodeMethod-->" + encodeMethod);
  return ne String((byte[]) encodeMethod.invoke(null, source.getBytes(), 0));
 } else {// JavaSE/JavaEE
  clazz = Class.forName("sun.misc.base64Encoder");
  encodeMethod = clazz.getMethod("encode", byte[].class);
  System.out.println("encodebase64-->" + clazz);
  System.out.println("encodeMethod-->" + encodeMethod);
  return (String) encodeMethod.invoke(clazz.neInstance(), source.getBytes());
 }
   } catch (ClassNotFoundException e1) {
 return null;
   } catch (Exception e1) {
 return null;
   }
  } catch (Exception e) {
   return null;
  }
  
  // return base64.encodeToString(source, base64.DEFAULT);
  // return ne String(base64.encode(source.getBytes(), base64.DEFAULT));
 
  
  // sun.misc.base64Encoder
  // base64Encoder encoder = ne base64Encoder();
  // return encoder.encode(source.getBytes());
 
  // .apache.mons.codec.binary.base64
  // return ne String(base64.encodebase64(source.getBytes()));
 }
 
 
 public static String decodebase64(String encodeSource) {
  Class clazz = null;
  Method decodeMethod = null;
 
  try {// 优先使用第三方库
   clazz = Class.forName(".apache.mons.codec.binary.base64");
   decodeMethod = clazz.getMethod("decodebase64", byte[].class);
   System.out.println("decodebase64-->" + clazz);
   System.out.println("decodeMethod-->" + decodeMethod);
   // 反射方法 静态方法执行无需对象
   return ne String((byte[]) decodeMethod.invoke(null, encodeSource.getBytes()));
  } catch (ClassNotFoundException e) {
   String vm = System.getProperty("java.vm.name");
   System.out.println(vm);
   try {
 if ("Dalvik".equals(vm)) {// Android
  clazz = Class.forName("android.util.base64");
  // byte[] base64.decode(byte[] input, int flags)
  decodeMethod = clazz.getMethod("decode", byte[].class, int.class);
  System.out.println("decodebase64-->" + clazz);
  System.out.println("decodeMethod-->" + decodeMethod);
  return ne String((byte[]) decodeMethod.invoke(null, encodeSource.getBytes(), 0));
 } else { // JavaSE/JavaEE
  clazz = Class.forName("sun.misc.base64Decoder");
  decodeMethod = clazz.getMethod("decodeBuffer", String.class);
  System.out.println("decodebase64-->" + clazz);
  System.out.println("decodeMethod-->" + decodeMethod);
  return ne String((byte[]) decodeMethod.invoke(clazz.neInstance(), encodeSource));
 }
   } catch (ClassNotFoundException e1) {
 return null;
   } catch (Exception e1) {
 return null;
   }
  } catch (Exception e) {
   return null;
  }
  
  // return ne
  // String(base64.decode(encodeSource.getBytes(),base64.DEFAULT));
 
  
  // sun.misc.base64Decoder
  // try {
  // base64Decoder decoder = ne base64Decoder();
  // return ne String(decoder.decodeBuffer(encodeSource));
  // } catch (IOException e) {
  // thro ne RuntimeException(e);
  // }
 
  // .apache.mons.codec.binary.base64
  // return ne String(base64.decodebase64(encodeSource.getBytes()));
 }
 
 
 public static byte[] encryptBitAES(byte[] content, String passord) {
  try {
   Cipher encryptCipher = Cipher.getInstance("AES/ECB/PKCS5Padding");// 创建密码器
   encryptCipher.init(Cipher.ENCRYPT_MODE, getKey(passord));// 初始化
   byte[] result = encryptCipher.doFinal(content);
   return result; // 加密
  } catch (NoSuchAlgorithmException e) {
   e.printStackTrace();
  } catch (NoSuchPaddingException e) {
   e.printStackTrace();
  } catch (InvalidKeyException e) {
   e.printStackTrace();
  } catch (IllegalBlockSizeException e) {
   e.printStackTrace();
  } catch (BadPaddingException e) {
   e.printStackTrace();
  }
  return null;
 }
 
 
 public static byte[] decryptBitAES(byte[] content, String passord) {
  try {
   Cipher decryptCipher = Cipher.getInstance("AES/ECB/PKCS5Padding");// 创建密码器
   decryptCipher.init(Cipher.DECRYPT_MODE, getKey(passord));// 初始化
   byte[] result = decryptCipher.doFinal(content);
   return result; // 加密结果
  } catch (InvalidKeyException e) {
   e.printStackTrace();
  } catch (NoSuchAlgorithmException e) {
   e.printStackTrace();
  } catch (NoSuchPaddingException e) {
   e.printStackTrace();
  } catch (IllegalBlockSizeException e) {
   e.printStackTrace();
  } catch (BadPaddingException e) {
   e.printStackTrace();
  }
  return null;
 }
 
 
 public static String encryptAES(String content, String passord) {
  return byte2HexStr(encryptBitAES(content.getBytes(), passord));
 }
 
 
 public static String decryptAES(String content, String passord) {
  return ne String(decryptBitAES(hexStr2Bytes(content), passord));
 }
 
 
 private static Key getKey(String passord) thros NoSuchAlgorithmException {
  SecureRandom secureRandom = ne SecureRandom(passord.getBytes());
  // 生成KEY
  KeyGenerator kgen = KeyGenerator.getInstance("AES");
  kgen.init(128, secureRandom);
  SecretKey secretKey = kgen.generateKey();
  byte[] enCodeFormat = secretKey.getEncoded();
  // 转换KEY
  SecretKeySpec key = ne SecretKeySpec(enCodeFormat, "AES");
  return key;
 }
 
 
 public static String byte2HexStr(byte[] bytes) {
  int bytesLen = bytes.length;
  // 每个byte用两个字符才能表示，所以字符串的长度是数组长度的两倍
  StringBuffer hexString = ne StringBuffer(bytesLen  2);
  for (int i = 0; i < bytesLen; i++) {
   // 将每个字节与0xFF进行与运算，然后转化为10进制，然后借助于Integer再转化为16进制
   String hex = Integer.toHexString(bytes[i] & 0xFF);
   if (hex.length() < 2) {
 hexString.append(0);// 如果为1位 前面补个0
   }
   hexString.append(hex);
  }
  return hexString.toString();
 }
 
 
 public static byte[] hexStr2Bytes(String strIn) {
  byte[] arrB = strIn.getBytes();
  int iLen = arrB.length;
 
  // 两个字符表示一个字节，所以字节数组长度是字符串长度除以2
  byte[] arrOut = ne byte[iLen / 2];
  for (int i = 0; i < iLen; i = i + 2) {
   String strTmp = ne String(arrB, i, 2);
   arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);
  }
  return arrOut;
 }
 
}