1.AES加密
package cn.cw.common.utils;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec;
/**
* ClassName: AESUtils.
* Description: AES加密工具类.
* Date: 2019年04月10日.
*
* @author
* @version 2.0.1
* @since 1.7
*/
public class AESUtils {
/**
* -默认字符集
*/
private static final String CHARSET = "utf-8";
/**
* -加密算法
*/
private static final String KEY_ALGORITHM = "AES";
/**
* -填充方式
*/
private static final String DEFAULT_CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";
/**
* -AES 加密操作
*
* @param content
* @param password
* @return
* @throws Exception
*/
public static String encrypt(String content, String password) {
Cipher cipher = null;
byte[] result = null;
try {
cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, getSecretKey(password));
byte[] byteContent = content.getBytes(CHARSET);
result = new byte[0];
result = cipher.doFinal(byteContent);
} 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 HexUtils.bytesToHex(result);
}
/**
* 加密并base64编码
*
* @param content
* @param password
* @return
* @throws Exception
*/
public static String encryptBase64(String content, String password) throws Exception {
Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, getSecretKey(password));
byte[] byteContent = content.getBytes(CHARSET);
byte[] result = cipher.doFinal(byteContent);
return Base64Utils.encode(result);
}
/**
* -AES 解密操作
*
* @param content
* @param password
* @return
* @throws Exception
*/
public static String decrypt(String content, String password) throws Exception {
Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, getSecretKey(password));
byte[] result = cipher.doFinal(HexUtils.hexStringToByte(content));
return new String(result, CHARSET);
}
/**
* 解密base64字符串
*
* @param content
* @param password
* @return
* @throws Exception
*/
public static String decryptBase64(String content, String password) throws Exception {
Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, getSecretKey(password));
byte[] result = cipher.doFinal(Base64Utils.decode(content));
return new String(result, CHARSET);
}
/**
* -生成加密秘钥
*
* @return
*/
private static SecretKeySpec getSecretKey(final String password) {
try {
return new SecretKeySpec(password.getBytes(CHARSET), KEY_ALGORITHM);
} catch (Exception e) {
throw new IllegalArgumentException("encode init error");
}
}
}
2.DES加密
package cn.cw.common.utils;
import java.io.IOException;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
/**
* ClassName: DESUtils.
* Description: DES加密工具类.
* Date:2019年5月20日.
*
* @author
* @version 1.1.0
* @since 1.7
*/
public class DESUtils {
/**
*-加密算法
*/
private final static String DES = "DES";
/**
*-默认字符集
*/
private final static String CHARSET = "utf-8";
/**
*-根据键值进行加密
* @param data
* @param key 加密键byte数组
* @return
* @throws Exception
*/
public static String encrypt(String data, String key) throws Exception {
return Base64Utils.encode(
encrypt(data.getBytes(CHARSET), key.getBytes(CHARSET)));
}
/**
*-根据键值进行解密
* @param data
* @param key 加密键byte数组
* @return
* @throws IOException
* @throws Exception
*/
public static String decrypt(String data, String key) throws Exception {
return new String(decrypt(Base64Utils.decode(data), key.getBytes(CHARSET)));
}
/**
*-根据键值进行加密
* @param data
* @param key 加密键byte数组
* @return
* @throws Exception
*/
public static byte[] encrypt(byte[] data, byte[] key) throws Exception {
// 生成一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密钥数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher对象实际完成加密操作
Cipher cipher = Cipher.getInstance(DES);
// 用密钥初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
return cipher.doFinal(data);
}
/**
*-根据键值进行解密
* @param data
* @param key 加密键byte数组
* @return
* @throws Exception
*/
private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
// 生成一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密钥数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher对象实际完成解密操作
Cipher cipher = Cipher.getInstance(DES);
// 用密钥初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
return cipher.doFinal(data);
}
}
3.RSA加密
package cn.cw.common.utils;
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.Cipher;
/**
* ClassName: RSAUtils.
* Description: 非对称加密算法RSA算法组件
* 非对称算法一般是用来传送对称加密算法的密钥来使用的，相对于DH算法，RSA算法只需要一方构造密钥，不需要
* 大费周章的构造各自本地的密钥对了。DH算法只能算法非对称算法的底层实现。而RSA算法算法实现起来较为简单
* Date:2019年6月9日.
*
* @author
* @version 1.1.0
* @since 1.7
*/
public class RSAUtils {
/**
*-定义加密方式
*/
public static final String KEY_RSA = "RSA";
/**
* key的长度
*/
private final static int KEY_SIZE = 1024;
/**
*-定义公钥关键词
*/
public static final String KEY_RSA_PUBLICKEY = "RSAPublicKey";
/**
*-定义私钥关键词
*/
public static final String KEY_RSA_PRIVATEKEY = "RSAPrivateKey";
/**
*-定义签名算法
*/
private final static String KEY_RSA_SIGNATURE = "MD5withRSA";
/**
*-生成公私密钥对
*/
public static Map initKey() throws NoSuchAlgorithmException {
//设置密钥对的bit数，越大越安全，但速度减慢，一般使用512或1024
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(KEY_RSA);
keyPairGenerator.initialize(KEY_SIZE);
KeyPair keyPair = keyPairGenerator.generateKeyPair();
// 获取公钥,私钥
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
// 将密钥对封装为Map
Map map = new HashMap();
map.put(KEY_RSA_PUBLICKEY, publicKey);
map.put(KEY_RSA_PRIVATEKEY, privateKey);
return map;
}
/**
* -获取Base64编码的公钥字符串
* @param map
* @return
*/
public static byte[] getPublicKey(Map map) {
Key key = (Key) map.get(KEY_RSA_PUBLICKEY);
return key.getEncoded();
}
/**
* -获取Base64编码的私钥字符串
* @param map
* @return
*/
public static byte[] getPrivateKey(Map map) {
Key key = (Key) map.get(KEY_RSA_PRIVATEKEY);
return key.getEncoded();
}
/**
* -公钥加密
* @param data
* @param keyBytes
* @return
* @throws Exception
*/
public static byte[] encryptByPublic(byte[] data, byte[] keyBytes) throws Exception {
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
// 取得待加密数据
KeyFactory factory = KeyFactory.getInstance(KEY_RSA);
PublicKey publicKey = factory.generatePublic(keySpec);
// 对数据加密
Cipher cipher = Cipher.getInstance(factory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return cipher.doFinal(data);
}
/**
* -私钥解密
* @param data
* @param keyBytes
* @return
* @throws Exception
*/
public static byte[] decryptByPrivate(byte[] data, byte[] keyBytes) throws Exception {
// 获得待解密数据
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory factory = KeyFactory.getInstance(KEY_RSA);
PrivateKey privateKey = factory.generatePrivate(keySpec);
// 对数据解密
Cipher cipher = Cipher.getInstance(factory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, privateKey);
return cipher.doFinal(data);
}
/**
* -私钥加密
* @param data
* @param keyBytes
* @return
* @throws Exception
*/
public static byte[] encryptByPrivate(byte[] data, byte[] keyBytes) throws Exception {
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory factory = KeyFactory.getInstance(KEY_RSA);
PrivateKey privateKey = factory.generatePrivate(keySpec);
// 对数据加密
Cipher cipher = Cipher.getInstance(factory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
return cipher.doFinal(data);
}
/**
* -公钥解密
* @param data
* @param keyBytes
* @return
* @throws Exception
*/
public static byte[] decryptByPublic(byte[] data, byte[] keyBytes) throws Exception {
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
// 取得待加密数据
KeyFactory factory = KeyFactory.getInstance(KEY_RSA);
PublicKey publicKey = factory.generatePublic(keySpec);
// 对数据解密
Cipher cipher = Cipher.getInstance(factory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, publicKey);
return cipher.doFinal(data);
}
/**
* -用私钥对加密数据进行签名
* @param data
* @param privateKey
* @return
* @throws Exception
*/
public static String sign(byte[] data, byte[] privateKey) throws Exception {
PKCS8EncodedKeySpec pkcs = new PKCS8EncodedKeySpec(privateKey);
// 指定的加密算法
KeyFactory factory = KeyFactory.getInstance(KEY_RSA);
PrivateKey key = factory.generatePrivate(pkcs);
// 用私钥对信息生成数字签名
Signature signature = Signature.getInstance(KEY_RSA_SIGNATURE);
signature.initSign(key);
signature.update(data);
return Base64Utils.encode(signature.sign());
}
/**
* -校验数字签名
* @param data
* @param publicKey
* @param sign
* @return
* @throws Exception
*/
public static boolean verify(byte[] data, byte[] publicKey, String sign) throws Exception {
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKey);
// 指定的加密算法
KeyFactory factory = KeyFactory.getInstance(KEY_RSA);
PublicKey key = factory.generatePublic(keySpec);
// 用公钥验证数字签名
Signature signature = Signature.getInstance(KEY_RSA_SIGNATURE);
signature.initVerify(key);
signature.update(data);
return signature.verify(Base64Utils.decode(sign));
}
public static void main(String[] args) throws Exception {
Map map = RSAUtils.initKey();
System.out.println(Base64Utils.encode(RSAUtils.getPrivateKey(map)));
System.out.println(Base64Utils.encode(RSAUtils.getPublicKey(map)));
}
}
4.SHA256加密
package cn.cw.common.utils;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* @ProjectName:
* @Package:
* @ClassName: SHA256Util
* @Description: SHA256Util加密工具类
* @Author:
* @CreateDate: 2019/3/22 16:28
*/
public class SHA256Util {
/**
* @date: 2019/3/22 16:30
* @author:
* @description SHA256加密
*/
public static String getSHA256StrJava(String str) {
MessageDigest messageDigest;
String encodeStr = "";
try {
messageDigest = MessageDigest.getInstance("SHA-256");
messageDigest.update(str.getBytes("UTF-8"));
encodeStr = byte2Hex(messageDigest.digest());
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return encodeStr;
}
private static String byte2Hex(byte[] bytes) {
StringBuffer stringBuffer = new StringBuffer();
String temp = null;
for (int i = 0; i < bytes.length; i++) {
temp = Integer.toHexString(bytes[i] & 0xFF);
if (temp.length() == 1) {
//1得到一位的进行补0操作
stringBuffer.append("0");
}
stringBuffer.append(temp);
}
return stringBuffer.toString();
}
}