Java实现的3des加密解密工具类示例

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);  }}