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);
  }
}

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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。