java 加密解密代码_JAVA加密解密代码

- 日理万妓 2022-11-05 10:55 169阅读 0赞

import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; public class MyDes \{     // 定义 加密算法     private static final String Algorithm = "DESede";     private String key = "wjdkseibheyskgvxhtes;gys";     private byte \[\] keybyte = key.getBytes();         /\*\*\*      \* 加密      \* @param keybyte 加密密钥，长度为24字节      \* @param pwd  被加密的数据      \* @return      \*/     private  byte\[\] encryptMode(byte\[\] keybyte,String pwd) \{           byte\[\] src = pwd.getBytes();          try \{               // 生成密钥               SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);               // 加密               Cipher c1 = Cipher.getInstance(Algorithm);               c1.init(Cipher.ENCRYPT\_MODE, deskey);               return c1.doFinal(src);           \} catch (Exception e1) \{               e1.printStackTrace();           \}           return null;       \}           /\*\*\*      \* 解密      \* @param keybyte 密钥      \* @param src 加密后的缓冲源      \* @return      \*/     private  byte\[\] decryptMode(byte\[\] keybyte,byte\[\] src) \{           try \{               // 生成密钥               SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);               // 解密               Cipher c1 = Cipher.getInstance(Algorithm);               c1.init(Cipher.DECRYPT\_MODE, deskey);               return c1.doFinal(src);           \} catch (Exception e1) \{                      \}          return null;       \}         // 转换成十六进制字符串       private String byte2hex(byte\[\] b) \{           String hs = "";           String stmp = "";             for (int n = 0; n < b.length; n++) \{                              stmp = (java.lang.Integer.toHexString(b\[n\] & 0XFF));                          if (stmp.length() == 1)                   hs = hs + "0" + stmp;               else                  hs = hs + stmp;               if (n < b.length - 1)                   hs = hs + "";           \}           return hs.toUpperCase();       \}         /\*\*\*      \* 返回加密后的字符串      \* @param pwd      \* @return      \*/     public String encrypt(String pwd)\{                return new String(this.encryptMode(keybyte, pwd));     \}         /\*\*\*      \* 根据密码生成cookie中保存的字符串      \* @param pwd      \* @return      \*/     public String getCoookieString(String pwd)\{         byte\[\] encoded = this.encryptMode(keybyte, pwd);            StringBuffer sb = new StringBuffer();         for (int i = 0; i < encoded.length; i++) \{             sb.append(encoded\[i\]);             if(i!=(encoded.length-1))\{                 sb.append("&");             \}         \}         return sb.toString();     \}         /\*\*\*      \* 把cookie中的字符串变成解密用的byte\[\]数组      \* @param cookieString      \* @return      \*/     private byte\[\] getCookieByte(String cookieString)\{         String \[\] s = cookieString.split("&");         byte\[\] en = new byte\[s.length\] ;         for (int i = 0; i < s.length; i++) \{             en\[i\] = Byte.parseByte(s\[i\]);         \}         return en;     \}         public String decrypt(String pwds)\{         byte\[\] en = this.getCookieByte(pwds);         return new String(this.decryptMode(keybyte, en));     \} \}