com.luues.util.encryption.RSAUtil_ss Maven / Gradle / Ivy
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A Simple Tool Operations Class
package com.luues.util.encryption;
import org.apache.commons.codec.binary.Base64;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
/**
* 前台加密 后台解密
*/
public class RSAUtil_ss {
/** */
/**
* 加密算法RSA
*/
public static final String KEY_ALGORITHM = "RSA";
/** */
/**
* 签名算法
*/
public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
/** */
/**
* 获取公钥的key
*/
private static final String PUBLIC_KEY = "RSAPublicKey";
/** */
/**
* 获取私钥的key
*/
private static final String PRIVATE_KEY = "RSAPrivateKey";
/** */
/**
* RSA最大加密明文大小
*/
private static final int MAX_ENCRYPT_BLOCK = 117;
/** */
/**
* RSA最大解密密文大小
*/
private static final int MAX_DECRYPT_BLOCK = 128;
/** */
/**
*
* 生成密钥对(公钥和私钥)
*
*
* @return
* @throws Exception
*/
public static Map createRSAKeys() throws NoSuchAlgorithmException {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
keyPairGen.initialize(1024);
KeyPair keyPair = keyPairGen.generateKeyPair();
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
Map keyMap = new HashMap(2);
keyMap.put(PUBLIC_KEY, Base64.encodeBase64String(publicKey.getEncoded()));
keyMap.put(PRIVATE_KEY, Base64.encodeBase64String(privateKey.getEncoded()));
return keyMap;
}
/** */
/**
*
* 用私钥对信息生成数字签名
*
*
* @param data 已加密数据
* @param privateKey 私钥(BASE64编码)
* @return
* @throws Exception
*/
public static String sign(String data, String privateKey) throws NoSuchAlgorithmException, InvalidKeySpecException, InvalidKeyException, SignatureException {
byte[] sourStr = Base64.decodeBase64(data.getBytes());
byte[] keyBytes = Base64.decodeBase64(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initSign(privateK);
signature.update(sourStr);
return Base64.encodeBase64String(signature.sign());
}
/** */
/**
*
* 校验数字签名
*
*
* @param data 已加密数据
* @param publicKey 公钥(BASE64编码)
* @param sign 数字签名
* @return
* @throws Exception
*/
public static boolean verify(String data, String publicKey, String sign) throws NoSuchAlgorithmException, InvalidKeySpecException, InvalidKeyException, SignatureException {
byte[] sourStr = Base64.decodeBase64(data.getBytes());
byte[] keyBytes = Base64.decodeBase64(publicKey);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PublicKey publicK = keyFactory.generatePublic(keySpec);
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initVerify(publicK);
signature.update(sourStr);
return signature.verify(Base64.decodeBase64(sign));
}
protected static ByteArrayOutputStream segmentDecryption(Cipher cipher, byte[] sourStr, boolean flag) throws BadPaddingException, IllegalBlockSizeException {
int count = flag ? MAX_DECRYPT_BLOCK : MAX_ENCRYPT_BLOCK;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int inputLen = sourStr.length;
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段解密
while (inputLen - offSet > 0) {
if (inputLen - offSet > count) {
cache = cipher.doFinal(sourStr, offSet, count);
} else {
cache = cipher.doFinal(sourStr, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * count;
}
return out;
}
/** */
/**
*
* 私钥解密
*
*
* @param encryptedData 已加密数据
* @param privateKey 私钥(BASE64编码)
* @return
* @throws Exception
*/
public static String decryptByPrivateKey(String encryptedData, String privateKey) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, IOException {
byte[] sourStr = Base64.decodeBase64(encryptedData.getBytes());
byte[] keyBytes = Base64.decodeBase64(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, privateK);
ByteArrayOutputStream out = segmentDecryption(cipher, sourStr, true);
byte[] decryptedData = out.toByteArray();
out.close();
return new String(decryptedData);
}
/** */
/**
*
* 公钥解密
*
*
* @param encryptedData 已加密数据
* @param publicKey 公钥(BASE64编码)
* @return
* @throws Exception
*/
public static String decryptByPublicKey(String encryptedData, String publicKey) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, IOException {
byte[] sourStr = Base64.decodeBase64(encryptedData.getBytes());
byte[] keyBytes = Base64.decodeBase64(publicKey);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicK = keyFactory.generatePublic(x509KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, publicK);
ByteArrayOutputStream out = segmentDecryption(cipher, sourStr, true);
byte[] decryptedData = out.toByteArray();
out.close();
return new String(decryptedData);
}
/** */
/**
*
* 公钥加密
*
*
* @param data 源数据
* @param publicKey 公钥(BASE64编码)
* @return
* @throws Exception
*/
public static String encryptByPublicKey(String data, String publicKey) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, IOException {
byte[] sourStr = Base64.decodeBase64(data.getBytes());
byte[] keyBytes = Base64.decodeBase64(publicKey);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicK = keyFactory.generatePublic(x509KeySpec);
// 对数据加密
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, publicK);
// 对数据分段加密
ByteArrayOutputStream out = segmentDecryption(cipher, sourStr, false);
byte[] encryptedData = out.toByteArray();
out.close();
return new String(encryptedData);
}
/** */
/**
*
* 私钥加密
*
*
* @param data 源数据
* @param privateKey 私钥(BASE64编码)
* @return
* @throws Exception
*/
public static String encryptByPrivateKey(String data, String privateKey) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, IOException {
byte[] sourStr = Base64.decodeBase64(data.getBytes());
byte[] keyBytes = Base64.decodeBase64(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, privateK);
// 对数据分段加密
ByteArrayOutputStream out = segmentDecryption(cipher, sourStr, false);
byte[] encryptedData = out.toByteArray();
out.close();
return new String(encryptedData);
}
/** */
/**
*
* 获取私钥
*
*
* @param keyMap 密钥对
* @return
* @throws Exception
*/
public static String getPrivateKey(Map keyMap) {
return keyMap.get(PRIVATE_KEY);
}
/** */
/**
*
* 获取公钥
*
*
* @param keyMap 密钥对
* @return
* @throws Exception
*/
public static String getPublicKey(Map keyMap) {
return keyMap.get(PUBLIC_KEY);
}
}