Java解密解密工具类

2023-11-27 15:28:44 浏览数 (1)

加密解密工具类

代码语言:javascript复制
import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.security.MessageDigest;
import java.security.SecureRandom;

public class EncryptUtil {
    public static final String MD5 = "MD5";
    public static final String SHA1 = "SHA1";
    public static final String HmacMD5 = "HmacMD5";
    public static final String HmacSHA1 = "HmacSHA1";
    public static final String DES = "DES";
    public static final String AES = "AES";

    /**编码格式;默认使用uft-8*/
    public String charset = "utf-8";
    /**DES*/
    public int keysizeDES = 0;
    /**AES*/
    public int keysizeAES = 128;

    public static EncryptUtil me;

    private EncryptUtil(){
        //单例
    }
    //双重锁
    public static EncryptUtil getInstance(){
        if (me==null) {
           synchronized (EncryptUtil.class) {
               if(me == null){
                   me = new EncryptUtil();
               }
           }
        }
        return me;
    }

    /**
     * 使用MessageDigest进行单向加密(无密码)
     * @param res 被加密的文本
     * @param algorithm 加密算法名称
     * @return
     */
    private String messageDigest(String res,String algorithm){
        try {
            MessageDigest md = MessageDigest.getInstance(algorithm);
            byte[] resBytes = charset==null?res.getBytes():res.getBytes(charset);
            return base64(md.digest(resBytes));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 使用KeyGenerator进行单向/双向加密(可设密码)
     * @param res 被加密的原文
     * @param algorithm  加密使用的算法名称
     * @param key 加密使用的秘钥
     * @return
     */
    private String keyGeneratorMac(String res,String algorithm,String key){
        try {
            SecretKey sk = null;
            if (key==null) {
                KeyGenerator kg = KeyGenerator.getInstance(algorithm);
                sk = kg.generateKey();
            }else {
                byte[] keyBytes = charset==null?key.getBytes():key.getBytes(charset);
                sk = new SecretKeySpec(keyBytes, algorithm);
            }
            Mac mac = Mac.getInstance(algorithm);
            mac.init(sk);
            byte[] result = mac.doFinal(res.getBytes());
            return base64(result);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 使用KeyGenerator双向加密,DES/AES,注意这里转化为字符串的时候是将2进制转为16进制格式的字符串,不是直接转,因为会出错
     * @param res 加密的原文
     * @param algorithm 加密使用的算法名称
     * @param key  加密的秘钥
     * @param keysize
     * @param isEncode
     * @return
     */
    private String keyGeneratorES(String res,String algorithm,String key,int keysize,boolean isEncode){
        try {
            KeyGenerator kg = KeyGenerator.getInstance(algorithm);
            if (keysize == 0) {
                byte[] keyBytes = charset==null?key.getBytes():key.getBytes(charset);
                kg.init(new SecureRandom(keyBytes));
            }else if (key==null) {
                kg.init(keysize);
            }else {
                byte[] keyBytes = charset==null?key.getBytes():key.getBytes(charset);
                kg.init(keysize, new SecureRandom(keyBytes));
            }
            SecretKey sk = kg.generateKey();
            SecretKeySpec sks = new SecretKeySpec(sk.getEncoded(), algorithm);
            Cipher cipher = Cipher.getInstance(algorithm);
            if (isEncode) {
                cipher.init(Cipher.ENCRYPT_MODE, sks);
                byte[] resBytes = charset==null?res.getBytes():res.getBytes(charset);
                return parseByte2HexStr(cipher.doFinal(resBytes));
            }else {
                cipher.init(Cipher.DECRYPT_MODE, sks);
                return new String(cipher.doFinal(parseHexStr2Byte(res)));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    private String base64(byte[] res){
        return Base64.encode(res);
    }

    /**将二进制转换成16进制 */
    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();
    }
    /**将16进制转换为二进制*/
    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;
    }

    /**
     * md5加密算法进行加密(不可逆)
     * @param res 需要加密的原文
     * @return
     */
    public String MD5(String res) {
        return messageDigest(res, MD5);
    }

    /**
     * md5加密算法进行加密(不可逆)
     * @param res  需要加密的原文
     * @param key  秘钥
     * @return
     */
    public String MD5(String res, String key) {
        return keyGeneratorMac(res, HmacMD5, key);
    }

    /**
     * 使用SHA1加密算法进行加密(不可逆)
     * @param res 需要加密的原文
     * @return
     */
    public String SHA1(String res) {
        return messageDigest(res, SHA1);
    }

    /**
     * 使用SHA1加密算法进行加密(不可逆)
     * @param res 需要加密的原文
     * @param key 秘钥
     * @return
     */
    public String SHA1(String res, String key) {
        return keyGeneratorMac(res, HmacSHA1, key);
    }

    /**
     * 使用DES加密算法进行加密(可逆)
     * @param res 需要加密的原文
     * @param key 秘钥
     * @return
     */
    public String DESencode(String res, String key) {
        return keyGeneratorES(res, DES, key, keysizeDES, true);
    }

    /**
     * 对使用DES加密算法的密文进行解密(可逆)
     * @param res 需要解密的密文
     * @param key 秘钥
     * @return
     */
    public String DESdecode(String res, String key) {
        return keyGeneratorES(res, DES, key, keysizeDES, false);
    }

    /**
     * 使用AES加密算法经行加密(可逆)
     * @param res 需要加密的密文
     * @param key 秘钥
     * @return
     */
    public String AESencode(String res, String key) {
        return keyGeneratorES(res, AES, key, keysizeAES, true);
    }

    /**
     * 对使用AES加密算法的密文进行解密
     * @param res 需要解密的密文
     * @param key 秘钥
     * @return
     */
    public String AESdecode(String res, String key) {
        return keyGeneratorES(res, AES, key, keysizeAES, false);
    }

    /**
     * 使用异或进行加密
     * @param res 需要加密的密文
     * @param key 秘钥
     * @return
     */
    public String XORencode(String res, String key) {
        byte[] bs = res.getBytes();
        for (int i = 0; i < bs.length; i  ) {
            bs[i] = (byte) ((bs[i]) ^ key.hashCode());
        }
        return parseByte2HexStr(bs);
    }

    /**
     * 使用异或进行解密
     * @param res 需要解密的密文
     * @param key 秘钥
     * @return
     */
    public String XORdecode(String res, String key) {
        byte[] bs = parseHexStr2Byte(res);
        for (int i = 0; i < bs.length; i  ) {
            bs[i] = (byte) ((bs[i]) ^ key.hashCode());
        }
        return new String(bs);
    }

    /**
     * 直接使用异或(第一调用加密,第二次调用解密)
     * @param res 密文
     * @param key 秘钥
     * @return
     */
    public int XOR(int res, String key) {
        return res ^ key.hashCode();
    }

    /**
     * 使用Base64进行加密
     * @param res 密文
     * @return
     */
    public String Base64Encode(String res) {
        return Base64.encode(res.getBytes());
    }

    /**
     * 使用Base64进行解密
     * @param res
     * @return
     */
    public String Base64Decode(String res) {
        return new String(Base64.decode(res));
    }
}

AES 支持Linux

代码语言:javascript复制
package xl.cloud.gis.system.Utils;

import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;

import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

public class AES {
    private static int length=128;
    /**
     * 加密
     *
     * @param content
     *            需要加密的内容
     * @param password
     *            加密密码
     * @return
     * @throws NoSuchAlgorithmException
     * @throws NoSuchPaddingException
     * @throws UnsupportedEncodingException
     * @throws InvalidKeyException
     * @throws BadPaddingException
     * @throws IllegalBlockSizeException
     */
    private static byte[] encrypt(String content, String password)
            throws Exception {

        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG" );
        secureRandom.setSeed(password.getBytes());
        kgen.init(length, secureRandom);
        SecretKey secretKey = kgen.generateKey();
        byte[] enCodeFormat = secretKey.getEncoded();
        SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
        Cipher cipher = Cipher.getInstance("AES");// 创建密码器
        byte[] byteContent = content.getBytes("utf-8");
        cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
        byte[] result = cipher.doFinal(byteContent);
        return result; // 加密

    }

    /**
     * 解密
     *
     * @param content
     *            待解密内容
     * @param password
     *            解密密钥
     * @return
     */
    private static byte[] decrypt(byte[] content, String password)
            throws Exception {

        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG" );
        secureRandom.setSeed(password.getBytes());
        kgen.init(length, secureRandom);
        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



    }

//  /**
//   * 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();
//  }
//
//  /**
//   * 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;
//  }

    /**
     * 加密
     *
     * @param content
     *            需要加密的内容
     * @param password
     *            加密密码
     * @return
     */
    public static byte[] encrypt2(String content, String password) {
        try {
            SecretKeySpec key = new SecretKeySpec(password.getBytes(), "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
            byte[] byteContent = content.getBytes("utf-8");
            cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
            byte[] result = cipher.doFinal(byteContent);
            return result; // 加密
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    public static String encrypt2Str(String content, String password) throws Exception {
        byte[] encryptResult = encrypt(content, password);
        return Base64.encode(encryptResult);
    }

    public static String decrypt2Str(String content, String password) throws Exception {

        byte[] decryptResult = decrypt(Base64.decode(content), password);
        return new String(decryptResult,"UTF-8");
    }

    public static void main(String[] args) throws Exception {
        String content = "t太阳est地";
        String password = "12345678";
        // 加密
        System.out.println("加密前:"   content);

        String tt4 = encrypt2Str(content, password);
        System.out.println(new String(tt4));

        // 解密
        String d = decrypt2Str(tt4, password);
        System.out.println("解密后:"   d);

//      加密前:t太阳est地
//      Bpf0jyJDj/pVHaRf66 OMA==
//      解密后:t太阳est地
    }
}

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