package com.hdl.photovoltaic.utils;
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import android.annotation.SuppressLint;
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import android.text.TextUtils;
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import com.hdl.sdk.link.common.utils.LogUtils;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.InvalidKeyException;
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import java.security.Key;
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import java.security.NoSuchAlgorithmException;
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import java.security.SecureRandom;
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import javax.crypto.BadPaddingException;
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import javax.crypto.Cipher;
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import javax.crypto.IllegalBlockSizeException;
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import javax.crypto.KeyGenerator;
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import javax.crypto.NoSuchPaddingException;
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import javax.crypto.SecretKey;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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import io.dcloud.common.adapter.util.CryptoProvider;
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/**
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* AES加密解密工具类
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*/
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public class AesUtils {
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private static final String SHA1PRNG = "HDLRDCENTER1985."; // SHA1PRNG 强随机种子算法
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private static final String AES = "AES"; //AES 加密
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private static final String CIPHERMODE = "AES/CBC/PKCS7Padding"; //AES算法/CBC模式/PKCS5Padding填充模式
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/**
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* 解密
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*
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* @param contentByte 待解密待字符串hexStr
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* @return 解密后byte[]数组
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*/
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public static byte[] decrypt(byte[] contentByte) {
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try {
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//KEY转换
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Key key = new SecretKeySpec(SHA1PRNG.getBytes(), AES);
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//解密
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Cipher cipher = Cipher.getInstance(CIPHERMODE);
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IvParameterSpec ivps = new IvParameterSpec(SHA1PRNG.getBytes());
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cipher.init(Cipher.DECRYPT_MODE, key, ivps);
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return cipher.doFinal(contentByte);
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} catch (NoSuchAlgorithmException
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| InvalidKeyException
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| NoSuchPaddingException
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| BadPaddingException
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| IllegalBlockSizeException
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| InvalidAlgorithmParameterException e) {
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LogUtils.e(e.getMessage());
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}
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return null;
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}
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/**
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* 加密
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*/
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public static String encrypt(String key, String cleartext) {
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if (TextUtils.isEmpty(cleartext)) {
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return cleartext;
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}
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try {
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byte[] result = encrypt(key, cleartext.getBytes());
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return parseByte2HexStr(result);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 加密
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*/
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public static byte[] encrypt(String key, byte[] clear) throws Exception {
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byte[] raw = getRawKey(key.getBytes());
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SecretKeySpec keySpec = new SecretKeySpec(raw, AES);
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Cipher cipher = Cipher.getInstance(CIPHERMODE);
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cipher.init(Cipher.ENCRYPT_MODE, keySpec, new IvParameterSpec(new
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byte[cipher.getBlockSize()]));
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return cipher.doFinal(clear);
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}
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/**
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* 解密
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*/
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public static String decrypt(String key, String encrypted) {
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if (TextUtils.isEmpty(encrypted)) {
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return encrypted;
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}
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try {
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byte[] enc = parseHexStr2Byte(encrypted);
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byte[] result = decrypt(key, enc);
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return new String(result);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 解密
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*/
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public static byte[] decrypt(String key, byte[] encrypted) throws Exception {
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byte[] raw = getRawKey(key.getBytes());
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SecretKeySpec keySpec = new SecretKeySpec(raw, AES);
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Cipher cipher = Cipher.getInstance(CIPHERMODE);
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cipher.init(Cipher.DECRYPT_MODE, keySpec, new IvParameterSpec(new
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byte[cipher.getBlockSize()]));
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return cipher.doFinal(encrypted);
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}
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/**
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* 处理密钥
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*/
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@SuppressLint("DeletedProvider")
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public static byte[] getRawKey(byte[] seed) throws Exception {
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KeyGenerator kgen = KeyGenerator.getInstance(AES);
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//for android
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SecureRandom sr = null;
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// 在4.2以上版本中，SecureRandom获取方式发生了改变
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if (android.os.Build.VERSION.SDK_INT >= 17) {
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sr = SecureRandom.getInstance(SHA1PRNG, new CryptoProvider());
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} else {
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sr = SecureRandom.getInstance(SHA1PRNG);
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}
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sr.setSeed(seed);
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kgen.init(128, sr); //128bits,192bits,256bits
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//AES中128位密钥，加密轮次为10轮；192位密钥，加密轮次为12轮；256位密钥，加密轮次为14轮。
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SecretKey secretKey = kgen.generateKey();
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return secretKey.getEncoded();
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}
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/**
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* 将二进制转换成16进制
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*/
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public static String parseByte2HexStr(byte[] buf) {
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StringBuilder sb = new StringBuilder();
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for (int i = 0; i < buf.length; i++) {
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String hex = Integer.toHexString(buf[i] & 0xFF);
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if (hex.length() == 1) {
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hex = '0' + hex;
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}
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sb.append(hex.toUpperCase());
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}
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return sb.toString();
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}
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/**
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* 将16进制转换为二进制
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*/
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public static byte[] parseHexStr2Byte(String hexStr) {
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if (hexStr.length() < 1)
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return null;
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byte[] result = new byte[hexStr.length() / 2];
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for (int i = 0; i < hexStr.length() / 2; i++) {
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int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
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int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2),
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16);
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result[i] = (byte) (high * 16 + low);
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}
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return result;
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}
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}
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