DES可逆加密算法

zd-common/common-core/src/main/java/com/zd/common/core/utils/DESUtils.java

@@ -0,0 +1,116 @@
+package com.zd.common.core.utils;
+
+import javax.crypto.Cipher;
+import javax.crypto.SecretKey;
+import javax.crypto.spec.SecretKeySpec;
+
+/**
+ * <p>DES可逆加密</p>
+ *
+ * @author: linft
+ * @date: 2021/3/7
+ * @since:
+ */
+public class DESUtils {
+
+    /**
+     * 随意定一个私钥（长度必须为24位）
+     */
+    public static final String SECRET_KEY = "7947A28811702D0EE20F944F";
+
+    /**
+     * 加密
+     *
+     * @param inStr     需要加密的内容
+     * @param secretKey 密钥
+     * @return 加密后的数据
+     */
+
+    public static String encrypt(String inStr, String secretKey) {
+        SecretKey deskey = new SecretKeySpec(secretKey.getBytes(), "DESede");
+        Cipher cipher;
+        String outStr = null;
+        try {
+            cipher = Cipher.getInstance("DESede");
+            cipher.init(Cipher.ENCRYPT_MODE, deskey);
+            outStr = byte2hex(cipher.doFinal(inStr.getBytes()));
+        } catch (Exception e) {
+            System.err.println("3DES加密异常"+ e.getMessage());
+        }
+        return outStr;
+    }
+
+    /**
+     * 解密
+     *
+     * @param inStr  需要解密的内容
+     * @param secretKey 密钥
+     * @return 解密后的数据
+     */
+    public static String decrypt(String inStr, String secretKey) {
+        SecretKey deskey = new SecretKeySpec(secretKey.getBytes(), "DESede");
+        Cipher cipher;
+        String outStr = null;
+        try {
+            cipher = Cipher.getInstance("DESede");
+            cipher.init(Cipher.DECRYPT_MODE, deskey);
+            outStr = new String(cipher.doFinal(hex2byte(inStr)));
+        } catch (Exception e) {
+            System.err.println("3DES解密异常"+e.getMessage());
+        }
+        return outStr;
+    }
+
+    /**
+     * 转化为16进制字符串方法
+     *
+     * @param digest 需要转换的字节组
+     * @return 转换后的字符串
+     */
+    private static String byte2hex(byte[] digest) {
+        StringBuffer hs = new StringBuffer();
+        String stmp = "";
+        for (int n = 0; n < digest.length; n++) {
+            stmp = Integer.toHexString(digest[n] & 0XFF);
+
+            if (stmp.length() == 1) {
+                hs.append("0" + stmp);
+            } else {
+                hs.append(stmp);
+            }
+        }
+        return hs.toString().toUpperCase();
+    }
+
+    /**
+     * 十六进转二进制
+     *
+     * @param hexStr 待转换16进制字符串
+     * @return 二进制字节组
+     */
+    public static byte[] hex2byte(String hexStr) {
+        if (hexStr == null)
+            return null;
+        hexStr = hexStr.trim();
+        int len = hexStr.length();
+        if (len == 0 || len % 2 == 1)
+            return null;
+        byte[] digest = new byte[len / 2];
+        try {
+            for (int i = 0; i < hexStr.length(); i += 2) {
+                digest[i / 2] = (byte) Integer.decode("0x" + hexStr.substring(i, i + 2)).intValue();
+            }
+            return digest;
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    public static void main(String[] args) {
+        String data = "05367892";
+        String key = DESUtils.encrypt(data,SECRET_KEY);
+        System.out.println("加密内容="+key);
+        String res = DESUtils.decrypt(key,SECRET_KEY);
+        System.out.println("解密内容="+res);
+    }
+}