RSA加密解密
RSAUtil.java
package com.soc.cloud.util;
import com.soc.cloud.exception.CommonError;
import com.soc.cloud.param.BaseErrResult;
import com.soc.cloud.util.redis.RedisParam;
import org.springframework.data.redis.core.RedisTemplate;
import java.io.ByteArrayOutputStream;
import java.math.BigInteger;
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.SecureRandom;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.RSAPublicKeySpec;
import javax.crypto.Cipher;
/**
* https://blog.csdn.net/sunansheng/article/details/48155823
* RSA 工具类。提供加密，解密，生成密钥对等方法。
* 需要到http://www.bouncycastle.org下载bcprov-jdk14-123.jar。
*
*/
public class RSAUtil {
private static final KeyPair keyPair = generateKeyPair();
/**
* 生成密钥对
* @return
* @throws Exception
*/
public static KeyPair generateKeyPair() {
try {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA",
new org.bouncycastle.jce.provider.BouncyCastleProvider());
final int KEY_SIZE = 1024;// 没什么好说的了，这个值关系到块加密的大小，可以更改，但是不要太大，否则效率会低
keyPairGen.initialize(KEY_SIZE, new SecureRandom());
KeyPair keyPair = keyPairGen.generateKeyPair();
return keyPair;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* 生成公钥
* @param modulus
* @param publicExponent
* @return
* @throws Exception
*/
public static RSAPublicKey generateRSAPublicKey(byte[] modulus,
byte[] publicExponent) throws Exception {
KeyFactory keyFac = null;
try {
keyFac = KeyFactory.getInstance("RSA",
new org.bouncycastle.jce.provider.BouncyCastleProvider());
} catch (NoSuchAlgorithmException ex) {
throw new Exception(ex.getMessage());
}
RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(new BigInteger(
modulus), new BigInteger(publicExponent));
try {
return (RSAPublicKey) keyFac.generatePublic(pubKeySpec);
} catch (InvalidKeySpecException ex) {
throw new Exception(ex.getMessage());
}
}
/**
* 生成私钥
* @param modulus
* @param privateExponent
* @return
* @throws Exception
*/
public static RSAPrivateKey generateRSAPrivateKey(byte[] modulus,
byte[] privateExponent) throws Exception {
KeyFactory keyFac = null;
try {
keyFac = KeyFactory.getInstance("RSA",
new org.bouncycastle.jce.provider.BouncyCastleProvider());
} catch (NoSuchAlgorithmException ex) {
throw new Exception(ex.getMessage());
}
RSAPrivateKeySpec priKeySpec = new RSAPrivateKeySpec(new BigInteger(
modulus), new BigInteger(privateExponent));
try {
return (RSAPrivateKey) keyFac.generatePrivate(priKeySpec);
} catch (InvalidKeySpecException ex) {
throw new Exception(ex.getMessage());
}
}
/**
* * 加密 *
*
* @param pk
* 加密的密钥 *
* @param data
* 待加密的明文数据 *
* @return 加密后的数据 *
* @throws Exception
*/
public static byte[] encrypt(PublicKey pk, byte[] data) throws Exception {
try {
Cipher cipher = Cipher.getInstance("RSA",
new org.bouncycastle.jce.provider.BouncyCastleProvider());
cipher.init(Cipher.ENCRYPT_MODE, pk);
int blockSize = cipher.getBlockSize();// 获得加密块大小，如：加密前数据为128个byte，而key_size=1024
// 加密块大小为127
// byte,加密后为128个byte;因此共有2个加密块，第一个127
// byte第二个为1个byte
int outputSize = cipher.getOutputSize(data.length);// 获得加密块加密后块大小
int leavedSize = data.length % blockSize;
int blocksSize = leavedSize != 0 ? data.length / blockSize + 1
: data.length / blockSize;
byte[] raw = new byte[outputSize * blocksSize];
int i = 0;
while (data.length - i * blockSize > 0) {
if (data.length - i * blockSize > blockSize)
cipher.doFinal(data, i * blockSize, blockSize, raw, i
* outputSize);
else
cipher.doFinal(data, i * blockSize, data.length - i
* blockSize, raw, i * outputSize);
// 这里面doUpdate方法不可用，查看源代码后发现每次doUpdate后并没有什么实际动作除了把byte[]放到
// ByteArrayOutputStream中，而最后doFinal的时候才将所有的byte[]进行加密，可是到了此时加密块大小很可能已经超出了
// OutputSize所以只好用dofinal方法。
i++;
}
return raw;
} catch (Exception e) {
throw new Exception(e.getMessage());
}
}
/**
* * 解密 *
*
* @param pk
* 解密的密钥 *
* @param raw
* 已经加密的数据 *
* @return 解密后的明文 *
* @throws Exception
*/
public static byte[] decrypt(PrivateKey pk, byte[] raw) throws Exception {
try {
Cipher cipher = Cipher.getInstance("RSA",
new org.bouncycastle.jce.provider.BouncyCastleProvider());
cipher.init(cipher.DECRYPT_MODE, pk);
int blockSize = cipher.getBlockSize();
ByteArrayOutputStream bout = new ByteArrayOutputStream(64);
int j = 0;
while (raw.length - j * blockSize > 0) {
bout.write(cipher.doFinal(raw, j * blockSize, blockSize));
j++;
}
return bout.toByteArray();
} catch (Exception e) {
throw new Exception(e.getMessage());
}
}
/**
* RSA 公用加密，用秘钥解密，然后base64加密返回
* @param password
* @param keyPair
* @return
* @throws Exception
*/
public static String passwordEncrypt(String password, KeyPair keyPair ) throws Exception {
return passwordEncrypt(true,password,keyPair);
}
/**
* RSA 公用加密，用秘钥解密，然后base64加密返回
* @return
*/
public static String passwordEncrypt(boolean passwordVerify,String password, KeyPair keyPair ) throws Exception {
// byte[] en_result = new BigInteger(password, 16).toByteArray();
byte[] en_result = hexStringToBytes(password ) ;
byte[] de_result = RSAUtil.decrypt(keyPair.getPrivate(),en_result);
StringBuffer sb = new StringBuffer();
sb.append(new String(de_result));
String rsaPsaaword = sb.reverse().toString();
// if (passwordVerify){
// boolean psaawordBl = StringUtil.validateKey(rsaPsaaword);
// if (psaawordBl){
// CommonError.CommonErr(new BaseErrResult("11001", "键盘上连续排序的密码，连续不得超过3位"));
// }
// }
String psaaword = EncryptUtils.encodeMD5String(
EncryptUtils.encodeBase64String(rsaPsaaword));
return psaaword;
}
/**
* RSA 公用加密，用秘钥解密， 返回真实密码
* @return
*/
public static String originalPasswordEncrypt(String password, KeyPair keyPair ) throws Exception {
byte[] en_result = hexStringToBytes(password ) ;
byte[] de_result = RSAUtil.decrypt(keyPair.getPrivate(),en_result);
StringBuffer sb = new StringBuffer();
sb.append(new String(de_result));
String rsaPsaaword = sb.reverse().toString();
return rsaPsaaword;
}
/**
* 16进制 To byte[]
* @param hexString
* @return byte[]
*/
public static byte[] hexStringToBytes(String hexString) {
if (hexString == null || hexString.equals("")) {
return null;
}
hexString = hexString.toUpperCase();
int length = hexString.length() / 2;
char[] hexChars = hexString.toCharArray();
byte[] d = new byte[length];
for (int i = 0; i < length; i++) {
int pos = i * 2;
d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
}
return d;
}
/**
* Convert char to byte
* @param c char
* @return byte
*/
private static byte charToByte(char c) {
return (byte) "0123456789ABCDEF".indexOf(c);
}
}
获取RSA公钥，将 秘钥对 存redis里
@Autowired RedisTemplate<String, Object> redisRsa; public static final String RSA_KEY_PAIR= "RSA_KEY_PAIR_";//每次RSA加密对应的秘钥 /** * */ @RequestMapping(value = "/getRsaPublicKey", method = { RequestMethod.GET }) @ResponseBody @SystemControllerLog(description = "获取RSA公钥", moduleName = "获取RSA公钥") public BaseResult getRsaPublicKey() throws Exception { KeyPair keyPair = RSAUtil.generateKeyPair();-- 获取秘钥对 redisRsa.opsForValue().set(RedisParam.RSA_KEY_PAIR, keyPair); Map<String, Object> map = new HashMap<String, Object>(2); RSAPublicKey rsap = (RSAPublicKey) keyPair.getPublic(); map.put("modulus", rsap.getModulus().toString(16)); map.put("e", rsap.getPublicExponent().toString(16)); return new BaseResult("0", "成功", map); }
公钥加密
@Autowired
RedisTemplate<String, Object> redisRsa;
@Override
public User login(String loginId, String password) throws Exception {
User user = userMapper.getUserByLoginId(loginId);
KeyPair keyPair = (KeyPair) redisRsa.opsForValue().get(RedisParam.RSA_KEY_PAIR); -- redis里获取秘钥对
//rsa加密登陆密码 做对比
String nUserPassWord = RSAUtil.passwordEncrypt(false,password,keyPair);
if(user==null||!user.getUserPassword().equals(nUserPassWord)){
// 登陆失败
CommonError.CommonErr(AdminResultParam.USER_PASSUSER_ERR.getErrResult());
}
return user;
}
解密同理
