加密工具类
import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.security.MessageDigest;
import java.security.SecureRandom;
public class EncryptUtil {
public static final String MD5 = "MD5";
public static final String SHA1 = "SHA1";
public static final String HmacMD5 = "HmacMD5";
public static final String HmacSHA1 = "HmacSHA1";
public static final String DES = "DES";
public static final String AES = "AES";
public String charset = "utf-8";
public int keysizeDES = 0;
public int keysizeAES = 128;
public static EncryptUtil me;
private EncryptUtil(){
}
public static EncryptUtil getInstance(){
if (me==null) {
synchronized (EncryptUtil.class) {
if(me == null){
me = new EncryptUtil();
}
}
}
return me;
}
private String messageDigest(String res,String algorithm){
try {
MessageDigest md = MessageDigest.getInstance(algorithm);
byte[] resBytes = charset==null?res.getBytes():res.getBytes(charset);
return base64(md.digest(resBytes));
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
private String keyGeneratorMac(String res,String algorithm,String key){
try {
SecretKey sk = null;
if (key==null) {
KeyGenerator kg = KeyGenerator.getInstance(algorithm);
sk = kg.generateKey();
}else {
byte[] keyBytes = charset==null?key.getBytes():key.getBytes(charset);
sk = new SecretKeySpec(keyBytes, algorithm);
}
Mac mac = Mac.getInstance(algorithm);
mac.init(sk);
byte[] result = mac.doFinal(res.getBytes());
return base64(result);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
private String keyGeneratorES(String res,String algorithm,String key,int keysize,boolean isEncode){
try {
KeyGenerator kg = KeyGenerator.getInstance(algorithm);
if (keysize == 0) {
byte[] keyBytes = charset==null?key.getBytes():key.getBytes(charset);
kg.init(new SecureRandom(keyBytes));
}else if (key==null) {
kg.init(keysize);
}else {
byte[] keyBytes = charset==null?key.getBytes():key.getBytes(charset);
SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
random.setSeed(key.getBytes());
kg.init(keysize, random);
}
SecretKey sk = kg.generateKey();
SecretKeySpec sks = new SecretKeySpec(sk.getEncoded(), algorithm);
Cipher cipher = Cipher.getInstance(algorithm);
if (isEncode) {
cipher.init(Cipher.ENCRYPT_MODE, sks);
byte[] resBytes = charset==null?res.getBytes():res.getBytes(charset);
String s = base64(resBytes);
resBytes = s.getBytes();
return parseByte2HexStr(cipher.doFinal(resBytes));
}else {
cipher.init(Cipher.DECRYPT_MODE, sks);
String s1 = new String(cipher.doFinal(parseHexStr2Byte(res)));
byte[] bytes = base64(s1);
return new String(bytes) ;
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
private String base64(byte[] res){
return Base64.encode(res);
}
private byte[] base64(String res){
return Base64.decode(res);
}
public static String parseByte2HexStr(byte buf[]) {
StringBuffer sb = new StringBuffer();
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();
}
public 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;
}
public String MD5(String res) {
return messageDigest(res, MD5);
}
public String MD5(String res, String key) {
return keyGeneratorMac(res, HmacMD5, key);
}
public String SHA1(String res) {
return messageDigest(res, SHA1);
}
public String SHA1(String res, String key) {
return keyGeneratorMac(res, HmacSHA1, key);
}
public String DESencode(String res, String key) {
return keyGeneratorES(res, DES, key, keysizeDES, true);
}
public String DESdecode(String res, String key) {
return keyGeneratorES(res, DES, key, keysizeDES, false);
}
public String AESencode(String res, String key) {
return keyGeneratorES(res, AES, key, keysizeAES, true);
}
public String AESdecode(String res, String key) {
return keyGeneratorES(res, AES, key, keysizeAES, false);
}
public String XORencode(String res, String key) {
byte[] bs = res.getBytes();
for (int i = 0; i < bs.length; i++) {
bs[i] = (byte) ((bs[i]) ^ key.hashCode());
}
return parseByte2HexStr(bs);
}
public String XORdecode(String res, String key) {
byte[] bs = parseHexStr2Byte(res);
for (int i = 0; i < bs.length; i++) {
bs[i] = (byte) ((bs[i]) ^ key.hashCode());
}
return new String(bs);
}
public int XOR(int res, String key) {
return res ^ key.hashCode();
}
public String Base64Encode(String res) {
return Base64.encode(res.getBytes());
}
public String Base64Decode(String res) {
return new String(Base64.decode(res));
}
}
