字符串加密解密类
import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.*;
public class EncryptData {
DESedeKeySpec spec;
SecretKeyFactory keyFactory;
SecretKey theKey;
Cipher cipher;
IvParameterSpec IvParameters;
public EncryptData() {
byte[] encryptKey;
try {
// 检测是否有 TripleDES 加密的供应程序
// 如无，明确地安装SunJCE 供应程序
try {
Cipher c = Cipher.getInstance("DESede");
} catch (Exception e) {
System.err.println("Installling SunJCE provider.");
Provider sunjce = new com.sun.crypto.provider.SunJCE();
Security.addProvider(sunjce);
}
// 创建一个密钥
encryptKey = "This is a test DESede Key".getBytes();
// 为上一密钥创建一个指定的 DESSede key
spec = new DESedeKeySpec(encryptKey);
// 得到 DESSede keys
keyFactory = SecretKeyFactory.getInstance("DESede");
// 生成一个 DESede 密钥对象
theKey = keyFactory.generateSecret(spec);
// 创建一个 DESede 密码
cipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");
// 为 CBC 模式创建一个用于初始化的 vector 对象
IvParameters = new IvParameterSpec(new byte[] { 12, 34, 56, 78, 90, 87, 65, 43 });
} catch (Exception exc) {
// 记录加密或解密操作错误
}
}
private String encrypt(String password) {
String encrypted_password = null;
byte[] encrypted_pwd = null;
try {
// 以加密模式初始化密钥
cipher.init(Cipher.ENCRYPT_MODE, theKey, IvParameters);
// 加密前的密码（旧）
byte[] plainttext = password.getBytes();
// 加密密码
encrypted_pwd = cipher.doFinal(plainttext);
// 转成字符串，得到加密后的密码（新）
encrypted_password = new String(encrypted_pwd);
} catch (Exception ex) {
// 记录加密错误
}
StringBuffer tempString = new StringBuffer();
for (int i = 0; i < encrypted_pwd.length; i++) {
tempString.append(encrypted_pwd[i] + ",");
}
String aa = new String(tempString);
return aa;
}
private String decrypt(String spassword) {
String[] ss = spassword.split(",");
byte[] password = new byte[ss.length];
for (int i = 0; i < ss.length; i++) {
password[i] = (byte) (new Integer(ss[i]).intValue());
}
String decrypted_password = null;
try {
// 以解密模式初始化密钥
cipher.init(Cipher.DECRYPT_MODE, theKey, IvParameters);
// 构造解密前的密码
byte[] decryptedPassword = password;
// 解密密码
byte[] decrypted_pwd = cipher.doFinal(decryptedPassword);
// 得到结果
decrypted_password = new String(decrypted_pwd);
} catch (Exception ex) {
// 记录解密错误
}
return decrypted_password;
}
/**
* 加密算法
* @param password 未加密的密码
* @return 加密后的密码
*/
public static String s_encrypt(String password) {
String encrypted_pwd = null;
EncryptData encryptData = new EncryptData();
encrypted_pwd = encryptData.encrypt(password);
return encrypted_pwd;
}
/**
* 解密算法
* @param password 加过密的密码
* @return 解密后的密码
*/
public static String b_decrypt(String password) {
String decrypted_password = null;
EncryptData encryptData = new EncryptData();
decrypted_password = encryptData.decrypt(password);
return decrypted_password;
}
}
