Java实现的3des加密解密工具类示例

本文实例讲述了java实现的3des加密解密工具类。分享给大家供大家参考，具体如下：

package com.gcloud.common;
import org.apache.poi.poifs.property.child;
import org.bouncycastle.jce.provider.bouncycastleprovider;
import javax.crypto.*;
import javax.crypto.spec.ivparameterspec;
import javax.crypto.spec.secretkeyspec;
import java.io.bufferedreader;
import java.io.file;
import java.io.ioexception;
import java.io.inputstreamreader;
import java.net.url;
import java.security.*;
import java.security.spec.algorithmparameterspec;
/**
 * 三重数据加密算法工具类
 * created by charlin on 2017/9/11.
 */
public class v3desutil {
  //密钥存放位置
  public static string filename = "d:/3des.key";
  // 1为加密，0为解密
  private int isencrypt = -1;
  // 加密/解密密钥，长度为16byte或者24byte。
  private string keystr;
  // 要加密/解密信息（解密时需为十六进制显示的字符串）
  private string message;
  public v3desutil() {
  }
  public v3desutil(int isencrypt, string keystr, string message) {
    this.isencrypt = isencrypt;
    this.keystr = keystr;
    this.message = message;
  }
  //numstr = 12345678
  public string v3deschiper(string numstr) {
    string result = null;
    try {
      security.addprovider(new bouncycastleprovider());
      url url = getclass().getresource(filename);
      file myfile = new file(filename);
      if (!myfile.exists()) {
        return "can't find " + filename;
      }
      try {
        bufferedreader in = new bufferedreader(new inputstreamreader(url.openstream()));
        while ((keystr = in.readline()) == null) {
          return "读取密钥失败！";
        }
        in.close();
      } catch (ioexception e) {
        e.printstacktrace();
      }
      secretkey key = new secretkeyspec(keystr.getbytes(), "desede");
      result = null;
      byte[] textbyte = null;
      byte[] messagebyte = null;
      cipher cipher = cipher.getinstance("desede/cbc/pkcs5padding", "bc");
      algorithmparameterspec spec = new ivparameterspec(numstr.getbytes());
      if (isencrypt == 1) {
        messagebyte = message.getbytes();
        cipher.init(cipher.encrypt_mode, key, spec);
      } else if (isencrypt == 0) {
        messagebyte = decodehex(message);
        cipher.init(cipher.decrypt_mode, key, spec);
      } else {
        return "加解密设置错误，请确认输入：1为加密；0为解密";
      }
      textbyte = cipher.dofinal(messagebyte);
      if (isencrypt == 1) {
        result = encodehex(textbyte);
      } else if (isencrypt == 0) {
        result = new string(textbyte);
      }
    } catch (exception e) {
      e.printstacktrace();
    }
    return result;
  }
  public static final string encodehex(byte bytes[]) {
    stringbuffer buf = new stringbuffer(bytes.length * 2);
    for (int i = 0; i < bytes.length; i++) {
      if ((bytes[i] & 0xff) < 16)
        buf.append("0");
      buf.append(long.tostring(bytes[i] & 0xff, 16));
    }
    return buf.tostring();
  }
  public static final byte[] decodehex(string hex) {
    char chars[] = hex.tochararray();
    byte bytes[] = new byte[chars.length / 2];
    int bytecount = 0;
    for (int i = 0; i < chars.length; i += 2) {
      int newbyte = 0;
      newbyte |= hexchartobyte(chars[i]);
      newbyte <<= 4;
      newbyte |= hexchartobyte(chars[i + 1]);
      bytes[bytecount] = (byte) newbyte;
      bytecount++;
    }
    return bytes;
  }
  private static final byte hexchartobyte(char ch) {
    switch (ch) {
      case 48: // '0'
        return 0;
      case 49: // '1'
        return 1;
      case 50: // '2'
        return 2;
      case 51: // '3'
        return 3;
      case 52: // '4'
        return 4;
      case 53: // '5'
        return 5;
      case 54: // '6'
        return 6;
      case 55: // '7'
        return 7;
      case 56: // '8'
        return 8;
      case 57: // '9'
        return 9;
      case 97: // 'a'
        return 10;
      case 98: // 'b'
        return 11;
      case 99: // 'c'
        return 12;
      case 100: // 'd'
        return 13;
      case 101: // 'e'
        return 14;
      case 102: // 'f'
        return 15;
      case 58: // ':'
      case 59: // ';'
      case 60: // '<'
      case 61: // '='
      case 62: // '>'
      case 63: // '?'
      case 64: // '@'
      case 65: // 'a'
      case 66: // 'b'
      case 67: // 'c'
      case 68: // 'd'
      case 69: // 'e'
      case 70: // 'f'
      case 71: // 'g'
      case 72: // 'h'
      case 73: // 'i'
      case 74: // 'j'
      case 75: // 'k'
      case 76: // 'l'
      case 77: // 'm'
      case 78: // 'n'
      case 79: // 'o'
      case 80: // 'p'
      case 81: // 'q'
      case 82: // 'r'
      case 83: // 's'
      case 84: // 't'
      case 85: // 'u'
      case 86: // 'v'
      case 87: // 'w'
      case 88: // 'x'
      case 89: // 'y'
      case 90: // 'z'
      case 91: // '['
      case 92: // '\\'
      case 93: // ']'
      case 94: // '^'
      case 95: // '_'
      case 96: // '`'
      default:
        return 0;
    }
  }
  public static string getfilename() {
    return filename;
  }
  public int getisencrypt() {
    return isencrypt;
  }
  public void setisencrypt(int isencrypt) {
    this.isencrypt = isencrypt;
  }
  public string getkeystr() {
    return keystr;
  }
  public void setkeystr(string keystr) {
    this.keystr = keystr;
  }
  public string getmessage() {
    return message;
  }
  public void setmessage(string message) {
    this.message = message;
  }
  public static void main(string[] args) {
    string key = "yycg12345678901234567890";
    string oldstring = "test" + "#" + "test" + "#" + system.currenttimemillis();
    v3desutil tempdesen = new v3desutil(1, oldstring, key);
    string strtemp = tempdesen.v3deschiper("12345678");
    system.out.println("strtemp=== " + strtemp);
    v3desutil tempde = new v3desutil(0, strtemp, key);
    string strtempde = tempde.v3deschiper("12345678");
    system.out.println("strtempde===" + strtempde);
  }
}

ps：关于加密解密感兴趣的朋友还可以参考本站在线工具：

文字在线加密解密工具（包含aes、des、rc4等）：

md5在线加密工具:
http://tools.jb51.net/password/createmd5password

在线散列/哈希算法加密工具:

在线md5/hash/sha-1/sha-2/sha-256/sha-512/sha-3/ripemd-160加密工具：

在线sha1/sha224/sha256/sha384/sha512加密工具：

更多关于java相关内容感兴趣的读者可查看本站专题：《java数学运算技巧总结》、《java数据结构与算法教程》、《java字符与字符串操作技巧总结》、《java操作dom节点技巧总结》和《java缓存操作技巧汇总》

希望本文所述对大家java程序设计有所帮助。