package com.luo.util;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
public class DecriptUtil {
/**
* @description: AES加密
* @parameter: str:待加密字符串,secretKeyBase:用于生成密钥的基础字符串
* @return: 加密字节数组
**/
public static byte[] encryptAES(String str, String secretKeyBase) {
try {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128, new SecureRandom(secretKeyBase.getBytes()));
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
Cipher cipher = Cipher.getInstance("AES");// 创建密码器
byte[] byteContent = str.getBytes("UTF-8");
cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
byte[] result = cipher.doFinal(byteContent);
return result; // 加密
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
}
return null;
}
/**
* @description: AES解密
* @parameter: strByteArray:待解密字节数组,
* @parameter: secretKeyBase:用于生成密钥的基础字符串, 需要注意的是EAS是对称加密,所以secretKeyBase在加密解密时要一样的
* @return: 解密后字符串
**/
public static String decryptAES(byte[] strByteArray, String secretKeyBase) {
try {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128, new SecureRandom(secretKeyBase.getBytes()));
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
Cipher cipher = Cipher.getInstance("AES");// 创建密码器
cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
String result = new String(cipher.doFinal(strByteArray),"UTF-8");
return result; // 加密
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return null;
}
/**
* @description: SHA、SHA1加密
* @parameter: str:待加密字符串
* @return: 加密串
**/
public static String SHA1(String str) {
try {
MessageDigest digest = java.security.MessageDigest
.getInstance("SHA-1"); //如果是SHA加密只需要将"SHA-1"改成"SHA"即可
digest.update(str.getBytes());
byte messageDigest[] = digest.digest();
// Create Hex String
StringBuffer hexStr = new StringBuffer();
// 字节数组转换为 十六进制 数
for (int i = 0; i < messageDigest.length; i++) {
String shaHex = Integer.toHexString(messageDigest[i] & 0xFF);
if (shaHex.length() < 2) {
hexStr.append(0);
}
hexStr.append(shaHex);
}
return hexStr.toString();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return null;
}
/**
* @description: MD5加密
* @parameter: str:待加密字符串
* @return: 加密串
**/
public static String MD5(String str) {
try {
// 获得MD5摘要算法的 MessageDigest 对象
MessageDigest mdInst = MessageDigest.getInstance("MD5");
// 使用指定的字节更新摘要
mdInst.update(str.getBytes());
// 获得密文
byte[] md = mdInst.digest();
// 把密文转换成十六进制的字符串形式
StringBuffer hexString = new StringBuffer();
// 字节数组转换为 十六进制 数
for (int i = 0; i < md.length; i++) {
String shaHex = Integer.toHexString(md[i] & 0xFF);
if (shaHex.length() < 2) {
hexString.append(0);
}
hexString.append(shaHex);
}
return hexString.toString();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return null;
}
}
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