代码语言：javascript复制
import javax.crypto.*;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
/**
* @author: Jack
* 2019-12-03 21:56
*/
public class AESUtil {
static final String ALGORITHM = "AES";
public static SecretKey secretKey() throws NoSuchAlgorithmException {
KeyGenerator keygenerator = KeyGenerator.getInstance(ALGORITHM);
SecureRandom securerandom = new SecureRandom();
keygenerator.init(securerandom); //对密钥生成器进行初始化，将随机数生成器传进去
SecretKey secretkey = keygenerator.generateKey(); //生成key
return secretkey;
}
//final static String charsetName = "UTF-8";
//static Charset charset = Charset.forName("UTF-8");
public static byte[] encrypt(String content, SecretKey secretkey) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {
return aes(content.getBytes(), Cipher.ENCRYPT_MODE, secretkey);
}
public static String decrypt(byte[] contentArray, SecretKey secretkey) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {
byte[] result2 = aes(contentArray, Cipher.DECRYPT_MODE, secretkey);
return new String(result2);
}
public static byte[] aes(byte[] contentArray, int mode, SecretKey secretkey) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(mode, secretkey);
byte[] result = cipher.doFinal(contentArray);
return result;
}
public static void main(String args[]) {
String content = "123";
try {
SecretKey key = secretKey();
byte[] encryptResult = encrypt(content, key);
System.out.println("加密后的结果为：" new String(encryptResult));
String decryptResult = decrypt(encryptResult, key);
System.out.println("解密后的结果为：" decryptResult);
} catch (NoSuchAlgorithmException e) {
} catch (InvalidKeyException e) {
} catch (NoSuchPaddingException e) {
} catch (IllegalBlockSizeException e) {
} catch (BadPaddingException e) {
} catch (UnsupportedEncodingException e) {
}
}
}import java.security.Key;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import org.apache.commons.lang.StringUtils;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
/**
* @author: Jack
* 2019-12-03 22:04
*/
public class MD5Util {
//向量(同时拥有向量和密匙才能解密)，此向量必须是8byte，多少都报错
private final byte[] DESIV = new byte[] { 0x22, 0x54, 0x36, 110, 0x40, (byte) 0xac, (byte) 0xad, (byte) 0xdf };// 向量
private AlgorithmParameterSpec iv = null;// 加密算法的参数接口
private Key key = null;
private String charset = "utf-8";
public static void main(String[] args) {
try {
String value = "123";
// 自定义密钥,个数不能太短，太短报错，过长，它默认只取前N位（N的具体值，大家另行查找资料）
String key = "asdfghjkl;'";
MD5Util mt= new MD5Util(key, "utf-8");
System.out.println("加密前的字符：" value);
System.out.println("加密后的字符：" mt.encode(value));
System.out.println("解密后的字符：" mt.decode(mt.encode(value)));
System.out.println("字符串的MD5值：" getMD5Value(value));
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 构造函数
* @param deSkey
* @param charset
* @throws Exception
*/
public MD5Util(String deSkey, String charset) throws Exception {
if (StringUtils.isNotBlank(charset)) {
this.charset = charset;
}
DESKeySpec keySpec = new DESKeySpec(deSkey.getBytes(this.charset));// 设置密钥参数
iv = new IvParameterSpec(DESIV);// 设置向量
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// 获得密钥工厂
key = keyFactory.generateSecret(keySpec);// 得到密钥对象
}
/**
* 加密
* @param data
* @return
* @throws Exception
*/
public String encode(String data) throws Exception {
Cipher enCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");// 得到加密对象Cipher
enCipher.init(Cipher.ENCRYPT_MODE, key, iv);// 设置工作模式为加密模式，给出密钥和向量
byte[] pasByte = enCipher.doFinal(data.getBytes(this.charset));
BASE64Encoder base64Encoder = new BASE64Encoder();
return base64Encoder.encode(pasByte);
}
/**
* 解密
* @param data
* @return
* @throws Exception
*/
public String decode(String data) throws Exception {
Cipher deCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
deCipher.init(Cipher.DECRYPT_MODE, key, iv);
BASE64Decoder base64Decoder = new BASE64Decoder();
//此处注意doFinal()的参数的位数必须是8的倍数，否则会报错（通过encode加密的字符串读出来都是8的倍数位，但写入文件再读出来，就可能因为读取的方式的问题，导致最后此处的doFinal()的参数的位数不是8的倍数）
//此处必须用base64Decoder，若用data。getBytes()则获取的字符串的byte数组的个数极可能不是8的倍数，而且不与上面的BASE64Encoder对应（即使解密不报错也不会得到正确结果）
byte[] pasByte = deCipher.doFinal(base64Decoder.decodeBuffer(data));
return new String(pasByte, this.charset);
}
/**
* 获取MD5的值，可用于对比校验
* @param sourceStr
* @return
*/
private static String getMD5Value(String sourceStr) {
String result = "";
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(sourceStr.getBytes());
byte b[] = md.digest();
int i;
StringBuffer buf = new StringBuffer("");
for (int offset = 0; offset < b.length; offset ) {
i = b[offset];
if (i < 0)
i = 256;
if (i < 16)
buf.append("0");
buf.append(Integer.toHexString(i));
}
result = buf.toString();
} catch (NoSuchAlgorithmException e) {
}
return result;
}
}
