package chat.security;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.InvalidKeyException;
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import java.security.NoSuchAlgorithmException;
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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.NoSuchPaddingException;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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public class AES {
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private static byte[] aes_key= {0x00,0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x78,0x79,0x7A,0x7B,0x7C,0x7D,0x7E,0x7F};
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public static void init(byte[] secret) {
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if (secret != null && secret.length == 16) {
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aes_key = new byte[16];
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for (int i = 0; i < 16; i++) {
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aes_key[i] = secret[i];
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}
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} else {
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System.out.println("Error int key error, secret incorrect");
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}
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}
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public static byte[] AESEncrypt(String sSrc, String userKey) {
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return AESEncrypt(sSrc.getBytes(), userKey);
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}
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public static byte[] AESEncrypt(byte[] tobeencrypdata, byte[] aesKey) {
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if (aesKey == null) {
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System.out.print("Key为空null");
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return null;
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}
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// 判断Key是否为16位
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if (aesKey.length != 16) {
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System.out.print("Key长度不是16位");
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return null;
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}
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try {
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SecretKeySpec skeySpec = new SecretKeySpec(aesKey, "AES");
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Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");//"算法/模式/补码方式"
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IvParameterSpec iv = new IvParameterSpec(aesKey);//使用CBC模式，需要一个向量iv，可增加加密算法的强度
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cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
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//2018.1.1 0:0:0 以来的小时数
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int curhour = (int) ((System.currentTimeMillis()/1000 - 1514736000)/3600);
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byte[] tobeencrypdatawithtime = new byte[tobeencrypdata.length + 4];
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byte byte0 = (byte)(curhour & 0xFF);
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tobeencrypdatawithtime[0] = byte0;
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byte byte1 = (byte)((curhour & 0xFF00) >> 8);
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tobeencrypdatawithtime[1] = byte1;
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byte byte2 = (byte)((curhour & 0xFF0000) >> 16);
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tobeencrypdatawithtime[2] = byte2;
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byte byte3 = (byte)((curhour & 0xFF) >> 24);
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tobeencrypdatawithtime[3] = byte3;
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System.arraycopy(tobeencrypdata, 0, tobeencrypdatawithtime, 4, tobeencrypdata.length);
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byte[] encrypted = cipher.doFinal(tobeencrypdatawithtime);
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return encrypted;
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} catch (NoSuchAlgorithmException e) {
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e.printStackTrace();
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} catch (NoSuchPaddingException e) {
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e.printStackTrace();
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} catch (InvalidKeyException e) {
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e.printStackTrace();
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} catch (InvalidAlgorithmParameterException e) {
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e.printStackTrace();
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} catch (IllegalBlockSizeException e) {
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e.printStackTrace();
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} catch (BadPaddingException 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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public static byte[] AESEncrypt(byte[] tobeencrypdata, String userKey) {
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byte[] aesKey = aes_key;
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if (userKey != null && !userKey.isEmpty()) {
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aesKey = convertUserKey(userKey);
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}
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return AESEncrypt(tobeencrypdata, aesKey);
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}
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public static int getUnsignedByte (byte data){ //将data字节型数据转换为0~255 (0xFF 即BYTE)。
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return data&0x0FF ;
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}
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private static byte[] convertUserKey(String userKey) {
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byte[] key = new byte[16];
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for (int i = 0; i < 16; i++) {
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key[i] = (byte) (userKey.charAt(i) & 0xFF);
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}
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return key;
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}
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public static byte[] AESDecrypt(byte[] sSrc, String userKey, boolean checkTime) {
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byte[] aesKey = aes_key;
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if (userKey != null && !userKey.isEmpty()) {
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aesKey = convertUserKey(userKey);
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}
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return AESDecrypt(sSrc, aesKey, checkTime);
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}
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public static byte[] AESDecrypt(byte[] sSrc, byte[] aesKey, boolean checkTime) {
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try {
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// 判断Key是否正确
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if (aesKey == null) {
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aesKey = aes_key;
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}
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// 判断Key是否为16位
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if (aesKey.length != 16) {
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System.out.print("Key长度不是16位");
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return null;
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}
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SecretKeySpec skeySpec = new SecretKeySpec(aesKey, "AES");
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Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
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IvParameterSpec iv = new IvParameterSpec(aesKey);
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cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
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try {
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byte[] original = cipher.doFinal(sSrc);
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int hours = 0;
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if (original.length > 4) {
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hours += getUnsignedByte(original[3]);
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hours <<= 8;
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hours += getUnsignedByte(original[2]);
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hours <<= 8;
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hours += getUnsignedByte(original[1]);
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hours <<= 8;
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hours += getUnsignedByte(original[0]);
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//2018.1.1 0:0:0 以来的小时数
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int curhour = (int) ((System.currentTimeMillis()/1000 - 1514736000)/3600);
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if (curhour - hours > 24 && checkTime) {
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return null;
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}
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byte[] neworiginal = new byte[original.length - 4];
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System.arraycopy(original, 4, neworiginal, 0, neworiginal.length);
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return neworiginal;
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}
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return null;
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} catch (Exception e) {
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System.out.println(e.toString());
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return null;
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}
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} catch (Exception ex) {
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System.out.println(ex.toString());
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return null;
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}
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}
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}
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