算法加密

分手后的思念是犯贱 2021-10-08 05:52 313阅读 0赞

package org.jeecgframework.core.util;
    
    
    import java.security.Key;
    import java.security.SecureRandom;
    import javax.crypto.Cipher;
    import javax.crypto.SecretKey;
    import javax.crypto.SecretKeyFactory;
    import javax.crypto.spec.PBEKeySpec;
    import javax.crypto.spec.PBEParameterSpec;
    public class PasswordUtil {
    
    
    /**
    * JAVA6支持以下任意一种算法 PBEWITHMD5ANDDES PBEWITHMD5ANDTRIPLEDES
    * PBEWITHSHAANDDESEDE PBEWITHSHA1ANDRC2_40 PBKDF2WITHHMACSHA1
    * */
    
    
    /**
    * 定义使用的算法为:PBEWITHMD5andDES算法
    */
    public static final String ALGORITHM = "PBEWithMD5AndDES";//加密算法
    public static final String Salt = "63293188";//密钥
    
    
    /**
    * 定义迭代次数为1000次
    */
    private static final int ITERATIONCOUNT = 1000;
    
    
    /**
    * 获取加密算法中使用的盐值,解密中使用的盐值必须与加密中使用的相同才能完成操作. 盐长度必须为8字节
    * 
    * @return byte[] 盐值
    * */
    public static byte[] getSalt() throws Exception {
    // 实例化安全随机数
    SecureRandom random = new SecureRandom();
    // 产出盐
    return random.generateSeed(8);
    }
    
    
    public static byte[] getStaticSalt() {
    // 产出盐
    return Salt.getBytes();
    }
    
    
    /**
    * 根据PBE密码生成一把密钥
    * 
    * @param password
    *            生成密钥时所使用的密码
    * @return Key PBE算法密钥
    * */
    private static Key getPBEKey(String password) {
    // 实例化使用的算法
    SecretKeyFactory keyFactory;
    SecretKey secretKey = null;
    try {
    keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
    // 设置PBE密钥参数
    PBEKeySpec keySpec = new PBEKeySpec(password.toCharArray());
    // 生成密钥
    secretKey = keyFactory.generateSecret(keySpec);
    } catch (Exception e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
    }
    
    
    return secretKey;
    }
    
    
    /**
    * 加密明文字符串
    * 
    * @param plaintext
    *            待加密的明文字符串
    * @param password
    *            生成密钥时所使用的密码
    * @param salt
    *            盐值
    * @return 加密后的密文字符串
    * @throws Exception
    */
    public static String encrypt(String plaintext, String password, byte[] salt) {
    
    
    Key key = getPBEKey(password);
    byte[] encipheredData = null;
    PBEParameterSpec parameterSpec = new PBEParameterSpec(salt, ITERATIONCOUNT);
    try {
    Cipher cipher = Cipher.getInstance(ALGORITHM);
    
    
    cipher.init(Cipher.ENCRYPT_MODE, key, parameterSpec);
    
    
    encipheredData = cipher.doFinal(plaintext.getBytes());
    } catch (Exception e) {
    }
    return bytesToHexString(encipheredData);
    }
    
    
    /**
    * 解密密文字符串
    * 
    * @param ciphertext
    *            待解密的密文字符串
    * @param password
    *            生成密钥时所使用的密码(如需解密,该参数需要与加密时使用的一致)
    * @param salt
    *            盐值(如需解密,该参数需要与加密时使用的一致)
    * @return 解密后的明文字符串
    * @throws Exception
    */
    public static String decrypt(String ciphertext, String password, byte[] salt) {
    
    
    Key key = getPBEKey(password);
    byte[] passDec = null;
    PBEParameterSpec parameterSpec = new PBEParameterSpec(getStaticSalt(), ITERATIONCOUNT);
    try {
    Cipher cipher = Cipher.getInstance(ALGORITHM);
    
    
    cipher.init(Cipher.DECRYPT_MODE, key, parameterSpec);
    
    
    passDec = cipher.doFinal(hexStringToBytes(ciphertext));
    }
    
    
    catch (Exception e) {
    // TODO: handle exception
    }
    return new String(passDec);
    }
    
    
    /**
    * 将字节数组转换为十六进制字符串
    * 
    * @param src
    *            字节数组
    * @return
    */
    public static String bytesToHexString(byte[] src) {
    StringBuilder stringBuilder = new StringBuilder("");
    if (src == null || src.length <= 0) {
    return null;
    }
    for (int i = 0; i < src.length; i++) {
    int v = src[i] & 0xFF;
    String hv = Integer.toHexString(v);
    if (hv.length() < 2) {
    stringBuilder.append(0);
    }
    stringBuilder.append(hv);
    }
    return stringBuilder.toString();
    }
    
    
    /**
    * 将十六进制字符串转换为字节数组
    * 
    * @param hexString
    *            十六进制字符串
    * @return
    */
    public static byte[] hexStringToBytes(String hexString) {
    if (hexString == null || hexString.equals("")) {
    return null;
    }
    hexString = hexString.toUpperCase();
    int length = hexString.length() / 2;
    char[] hexChars = hexString.toCharArray();
    byte[] d = new byte[length];
    for (int i = 0; i < length; i++) {
    int pos = i * 2;
    d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
    }
    return d;
    }
    
    
    private static byte charToByte(char c) {
    return (byte) "0123456789ABCDEF".indexOf(c);
    }
    
    
    public static void main(String[] args) {
    int i=10;
    for (int j = 0; j < i; j++) {
    if((j)%3==0)
    {
    System.out.print("<br>");
    }
    else {
    System.out.print(j);
    }
    }
    System.out.print(-1%2==0);
    String str = "admin";
    String password = "123456";
    
    
    org.jeecgframework.core.util.LogUtil.info("明文:" + str);
    org.jeecgframework.core.util.LogUtil.info("密码:" + password);
    
    
    try {
    byte[] salt = PasswordUtil.getStaticSalt();
    String ciphertext = PasswordUtil.encrypt(str, password, salt);
    org.jeecgframework.core.util.LogUtil.info("密文:" + ciphertext);
    String plaintext = PasswordUtil.decrypt(ciphertext, password, salt);
    org.jeecgframework.core.util.LogUtil.info("明文:" + plaintext);
    } catch (Exception e) {
    e.printStackTrace();
    }
    }
    }