java AES 加密解密工具（Advanced Encryption Standard）发现明文相同但每次重启服务后密文就会不同于是有了改进
1、通用方法
package com.qlkj.hzd.commom.utils; import javax.crypto.*; import java.io.UnsupportedEncodingException; import java.security.*; /** * RSA相关工具类 * * @author vampire * @date 2018/10/12 下午5:33 */ public class EncrypAES { //KeyGenerator 提供对称密钥生成器的功能，支持各种算法 private static KeyGenerator keygen; //SecretKey 负责保存对称密钥 private static SecretKey deskey; //Cipher负责完成加密或解密工作 private static Cipher c; //该字节数组负责保存加密的结果 private static byte[] cipherByte; static { try { Security.addProvider(new com.sun.crypto.provider.SunJCE()); //实例化支持DES算法的密钥生成器(算法名称命名需按规定，否则抛出异常) keygen = KeyGenerator.getInstance("AES"); //生成密钥 deskey = keygen.generateKey(); //生成Cipher对象,指定其支持的DES算法 c = Cipher.getInstance("AES"); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (NoSuchPaddingException e) { e.printStackTrace(); } } /** * 对字符串加密 * * @param str * @return * @throws InvalidKeyException * @throws IllegalBlockSizeException * @throws BadPaddingException */ public static String Encrytor(String str) throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException { // 根据密钥，对Cipher对象进行初始化，ENCRYPT_MODE表示加密模式 c.init(Cipher.ENCRYPT_MODE, deskey); byte[] src = str.getBytes("utf-8"); // 加密，结果保存进cipherByte cipherByte = c.doFinal(src); return parseByte2HexStr(cipherByte); } /** * 对字符串解密 * * @param str * @return * @throws InvalidKeyException * @throws IllegalBlockSizeException * @throws BadPaddingException */ public static String Decryptor(String str) throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException { // 根据密钥，对Cipher对象进行初始化，DECRYPT_MODE表示加密模式 c.init(Cipher.DECRYPT_MODE, deskey); cipherByte = c.doFinal(parseHexStr2Byte(str)); return new String(cipherByte); } /** * 将16进制转换为二进制 * * @param hexStr * * @return */ public static byte[] parseHexStr2Byte(String hexStr) { if (hexStr.length() < 1) { return null; } byte[] result = new byte[hexStr.length() / 2]; for (int i = 0; i < hexStr.length() / 2; i++) { int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16); int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16); result[i] = (byte) (high * 16 + low); } return result; } /** * 将二进制转换成16进制 * * @param buf * @return */ public static String parseByte2HexStr(byte buf[]) { StringBuffer sb = new StringBuffer(); for (int i = 0; i < buf.length; i++) { String hex = Integer.toHexString(buf[i] & 0xFF); if (hex.length() == 1) { hex = '0' + hex; } sb.append(hex.toUpperCase()); } return sb.toString(); } }
2、添加密码加解密
public static byte[] decrypt(byte[] content, String password) { try { KeyGenerator kgen = KeyGenerator.getInstance("AES"); kgen.init(128, new SecureRandom(password.getBytes())); SecretKey secretKey = kgen.generateKey(); byte[] enCodeFormat = secretKey.getEncoded(); SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES"); Cipher cipher = Cipher.getInstance("AES");// 创建密码器 cipher.init(Cipher.DECRYPT_MODE, key);// 初始化 byte[] result = cipher.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; }
3、由于每次启动服务生产的
SecretKey secretKey = kgen.generateKey(); 会变 所以在 下边初始化时就将key写死。
package com.qlkj.hzd.commom.utils;
import com.alibaba.fastjson.JSONObject;
import javax.crypto.*;
import java.io.UnsupportedEncodingException;
import java.security.*;
/**
* RSA相关工具类
*
* @author vampire
* @date 2018/10/12 下午5:33
*/
public class EncrypAES {
//KeyGenerator 提供对称密钥生成器的功能，支持各种算法
private static KeyGenerator keygen;
//SecretKey 负责保存对称密钥
private static SecretKey deskey = new SecretKey() {
@Override
public String getAlgorithm() {
return "AES";
}
@Override
public String getFormat() {
return "RAW";
}
@Override
public byte[] getEncoded() {
MessageDigest md = null;
byte[] thedigest = null;
try {
md = MessageDigest.getInstance("MD5");
thedigest = md.digest("pe1mUKtDZWxX2O41ea5+Tg==".getBytes("utf-8"));
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return thedigest;
}
};
//Cipher负责完成加密或解密工作
private static Cipher c;
//该字节数组负责保存加密的结果
private static byte[] cipherByte;
static {
try {
Security.addProvider(new com.sun.crypto.provider.SunJCE());
//实例化支持DES算法的密钥生成器(算法名称命名需按规定，否则抛出异常)
keygen = KeyGenerator.getInstance("AES");
//生成密钥
// deskey = keygen.generateKey();
System.out.println(JSONObject.toJSONString(deskey));
//生成Cipher对象,指定其支持的DES算法
c = Cipher.getInstance("AES");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
}
}
/**
* 对字符串加密
*
* @param str
* @return
* @throws InvalidKeyException
* @throws IllegalBlockSizeException
* @throws BadPaddingException
*/
public static String encrytor(String str) throws InvalidKeyException,
IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {
// 根据密钥，对Cipher对象进行初始化，ENCRYPT_MODE表示加密模式
c.init(Cipher.ENCRYPT_MODE, deskey);
byte[] src = str.getBytes("utf-8");
// 加密，结果保存进cipherByte
cipherByte = c.doFinal(src);
return parseByte2HexStr(cipherByte);
}
/**
* 对字符串解密
*
* @param str
* @return
* @throws InvalidKeyException
* @throws IllegalBlockSizeException
* @throws BadPaddingException
*/
public static String decryptor(String str) throws InvalidKeyException,
IllegalBlockSizeException, BadPaddingException {
// 根据密钥，对Cipher对象进行初始化，DECRYPT_MODE表示加密模式
c.init(Cipher.DECRYPT_MODE, deskey);
cipherByte = c.doFinal(parseHexStr2Byte(str));
return new String(cipherByte);
}
/**
* 将16进制转换为二进制
* * @param hexStr
* * @return
*/
private static byte[] parseHexStr2Byte(String hexStr) {
if (hexStr.length() < 1) {
return null;
}
byte[] result = new byte[hexStr.length() / 2];
for (int i = 0; i < hexStr.length() / 2; i++) {
int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
result[i] = (byte) (high * 16 + low);
}
return result;
}
/**
* 将二进制转换成16进制
*
* @param buf
* @return
*/
private static String parseByte2HexStr(byte buf[]) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < buf.length; i++) {
String hex = Integer.toHexString(buf[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
sb.append(hex.toUpperCase());
}
return sb.toString();
}
}
