版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/sgl520lxl/article/details/83021687
工具类:
package com.sgl.test;
import java.security.SecureRandom;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
public class SecretUtils {
public static final String DES = "DES";
public static final String AES = "AES";
private static Map<String, Integer> keySize = new HashMap<>();
static {
keySize.put(DES, 56);
keySize.put(AES, 128);
}
public static String encrypt(String data, String key, String algorithm) {
try {
if (StringUtils.isBlank(data) || StringUtils.isBlank(key)) {
return null;
}
byte[] content = data.getBytes("UTF-8");
KeyGenerator kgen = KeyGenerator.getInstance(algorithm);
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
secureRandom.setSeed(key.getBytes());
kgen.init(keySize.get(algorithm), secureRandom);
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec keySpec = new SecretKeySpec(enCodeFormat, algorithm);
Cipher cipher = Cipher.getInstance(algorithm);// 创建密码器
cipher.init(Cipher.ENCRYPT_MODE, keySpec);// 初始化
byte[] result = cipher.doFinal(content);
return parseByte2HexStr(result);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static String decrypt(String data, String key, String algorithm) {
try {
if (StringUtils.isBlank(data) || StringUtils.isBlank(key)) {
return null;
}
byte[] content = parseHexStr2Byte(data);
KeyGenerator kgen = KeyGenerator.getInstance(algorithm);
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
secureRandom.setSeed(key.getBytes());
kgen.init(keySize.get(algorithm), secureRandom);
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec keySpec = new SecretKeySpec(enCodeFormat, algorithm);
Cipher cipher = Cipher.getInstance(algorithm);// 创建密码器
cipher.init(Cipher.DECRYPT_MODE, keySpec);// 初始化
byte[] result = cipher.doFinal(content);
return new String(result, "UTF-8");
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 将二进制转换成16进制
*
* @param buf
* @return
*/
private static String parseByte2HexStr(byte buf[]) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < buf.length; i++) {
String hex = Integer.toHexString(buf[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
sb.append(hex.toUpperCase());
}
return sb.toString();
}
private static byte[] parseHexStr2Byte(String hexStr) {
if (hexStr.length() < 1) {
return null;
}
byte[] result = new byte[hexStr.length() / 2];
for (int i = 0; i < hexStr.length() / 2; i++) {
int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
result[i] = (byte) (high * 16 + low);
}
return result;
}
}
main方法验证
package com.sgl.test;
public class SglTest {
public static void main(String[]args){
String json = "{/'a/':2,/'b/:10'}";
String enstring = SecretUtils.encrypt(json, "qq93667454", "AES");
System.out.println(enstring);
String destring = SecretUtils.decrypt(enstring, "qq93667454", "AES");
System.out.println(destring);
}
}