package com.walker.infrastructure.utils;
|
|
import java.io.ByteArrayOutputStream;
|
import java.nio.charset.Charset;
|
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.SecureRandom;
|
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;
|
|
import com.walker.infrastructure.utils.StringUtils;
|
|
public class RSAUtil {
|
public static final Charset UTF8 = Charset.forName("UTF-8");
|
|
public static final String DEFAULT_ALGORITHM = "RSA/ECB/PKCS1Padding";
|
|
/**
|
* 加密算法RSA
|
*/
|
public static final String KEY_ALGORITHM = "RSA";
|
|
/**
|
* 签名算法
|
*/
|
public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
|
public static final String SIGNaTURE_ALGORITHM_SHA1_RSA = "SHA1WithRSA";
|
|
/**
|
* 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;
|
|
public static String privateKeyPath = "private_key.pem";
|
public static String publicKeyPath = "public_key.pem";
|
|
private static KeyFactory rsaKeyFactory = null;
|
|
static {
|
try {
|
rsaKeyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
|
} catch (NoSuchAlgorithmException e) {
|
throw new UnsupportedOperationException("未找到加密算法：" + KEY_ALGORITHM);
|
}
|
}
|
|
// public RSAUtil(){
|
// try {
|
// rsaKeyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
|
// } catch (NoSuchAlgorithmException e) {
|
// throw new UnsupportedOperationException("未找到加密算法：" + KEY_ALGORITHM);
|
// }
|
// }
|
|
/**
|
* 生成秘钥对
|
*
|
* @return
|
* @throws NoSuchAlgorithmException
|
*/
|
public static KeyPair generateKey() throws NoSuchAlgorithmException {
|
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
|
keyPairGen.initialize(1024, new SecureRandom());
|
KeyPair keyPair = keyPairGen.generateKeyPair();
|
return keyPair;
|
}
|
|
public static String toHexString(byte[] b) {
|
StringBuilder sb = new StringBuilder(b.length * 2);
|
for (int i = 0; i < b.length; i++) {
|
sb.append(HEXCHAR[(b[i] & 0xf0) >>> 4]);
|
sb.append(HEXCHAR[b[i] & 0x0f]);
|
}
|
return sb.toString();
|
}
|
|
public static final byte[] toBytes(String s) {
|
byte[] bytes;
|
bytes = new byte[s.length() / 2];
|
for (int i = 0; i < bytes.length; i++) {
|
bytes[i] = (byte) Integer.parseInt(s.substring(2 * i, 2 * i + 2),
|
16);
|
}
|
return bytes;
|
}
|
|
private static char[] HEXCHAR = { '0', '1', '2', '3', '4', '5', '6', '7',
|
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
|
|
/**
|
* <p>
|
* 生成密钥对(公钥和私钥)
|
* </p>
|
*
|
* @return
|
* @throws Exception
|
*/
|
public static Map<String, Object> genKeyPair() throws Exception {
|
KeyPair keyPair = generateKey();
|
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
|
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
|
Map<String, Object> keyMap = new HashMap<String, Object>(2);
|
keyMap.put(PUBLIC_KEY, publicKey);
|
keyMap.put(PRIVATE_KEY, privateKey);
|
return keyMap;
|
}
|
|
/**
|
* <p>
|
* 用私钥对信息生成数字签名
|
* </p>
|
*
|
* @param data
|
* 已加密数据
|
* @param privateKey
|
* 私钥(BASE64编码)
|
*
|
* @return
|
* @throws Exception
|
*/
|
public static String sign(byte[] data, String privateKey) throws Exception {
|
byte[] keyBytes = Base64Utils.decode(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(data);
|
return Base64Utils.encode(signature.sign());
|
}
|
|
/**
|
* 签名算法，使用SHA1WithRSA，目前支付宝使用。
|
* @param content
|
* @param privateKey
|
* @return
|
*/
|
public static String signWithSha1Rsa(String content, String privateKey) {
|
try {
|
PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(Base64Utils.decode(privateKey));
|
// KeyFactory keyf = KeyFactory.getInstance(KEY_ALGORITHM);
|
PrivateKey priKey = rsaKeyFactory.generatePrivate(priPKCS8);
|
Signature signature = Signature.getInstance(SIGNaTURE_ALGORITHM_SHA1_RSA);
|
|
signature.initSign(priKey);
|
signature.update(content.getBytes(StringUtils.DEFAULT_CHARSET_UTF8));
|
|
byte[] signed = signature.sign();
|
return Base64Utils.encode(signed);
|
|
} catch (Exception e) {
|
e.printStackTrace();
|
}
|
return null;
|
}
|
|
/**
|
* 验证签名，目前支付宝使用
|
* @param content
|
* @param sign
|
* @param alipay_public_key
|
* @param input_charset
|
* @return
|
* @throws Exception
|
*/
|
public static boolean verifyWithSha1Rsa(String content, String sign
|
, String alipay_public_key, String input_charset) throws Exception{
|
// KeyFactory keyFactory = KeyFactory.getInstance("RSA");
|
byte[] encodedKey = Base64Utils.decode(alipay_public_key);
|
PublicKey pubKey = rsaKeyFactory.generatePublic(new X509EncodedKeySpec(encodedKey));
|
|
Signature signature = Signature.getInstance(SIGNaTURE_ALGORITHM_SHA1_RSA);
|
signature.initVerify(pubKey);
|
signature.update(content.getBytes(input_charset));
|
|
return signature.verify(Base64Utils.decode(sign) );
|
}
|
|
/**
|
* <p>
|
* 校验数字签名
|
* </p>
|
*
|
* @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(byte[] data, String publicKey, String sign)
|
throws Exception {
|
byte[] keyBytes = Base64Utils.decode(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(data);
|
return signature.verify(Base64Utils.decode(sign));
|
}
|
|
/**
|
* <P>
|
* 私钥解密
|
* </p>
|
*
|
* @param encryptedData
|
* 已加密数据
|
* @param privateKey
|
* 私钥(BASE64编码)
|
* @return
|
* @throws Exception
|
*/
|
public static byte[] decryptByPrivateKey(byte[] encryptedData,
|
String privateKey) throws Exception {
|
byte[] keyBytes = Base64Utils.decode(privateKey);
|
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
|
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
|
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
|
// String al = keyFactory.getAlgorithm();
|
Cipher cipher = Cipher.getInstance(DEFAULT_ALGORITHM);
|
cipher.init(Cipher.DECRYPT_MODE, privateK);
|
int inputLen = encryptedData.length;
|
ByteArrayOutputStream out = new ByteArrayOutputStream();
|
int offSet = 0;
|
byte[] cache;
|
int i = 0;
|
// 对数据分段解密
|
while (inputLen - offSet > 0) {
|
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
|
cache = cipher
|
.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
|
} else {
|
cache = cipher
|
.doFinal(encryptedData, offSet, inputLen - offSet);
|
}
|
out.write(cache, 0, cache.length);
|
i++;
|
offSet = i * MAX_DECRYPT_BLOCK;
|
}
|
byte[] decryptedData = out.toByteArray();
|
out.close();
|
return decryptedData;
|
}
|
|
/**
|
* <p>
|
* 公钥解密
|
* </p>
|
*
|
* @param encryptedData
|
* 已加密数据
|
* @param publicKey
|
* 公钥(BASE64编码)
|
* @return
|
* @throws Exception
|
*/
|
public static byte[] decryptByPublicKey(byte[] encryptedData,
|
String publicKey) throws Exception {
|
byte[] keyBytes = Base64Utils.decode(publicKey);
|
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
|
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
|
Key publicK = keyFactory.generatePublic(x509KeySpec);
|
Cipher cipher = Cipher.getInstance(DEFAULT_ALGORITHM);
|
cipher.init(Cipher.DECRYPT_MODE, publicK);
|
int inputLen = encryptedData.length;
|
ByteArrayOutputStream out = new ByteArrayOutputStream();
|
int offSet = 0;
|
byte[] cache;
|
int i = 0;
|
// 对数据分段解密
|
while (inputLen - offSet > 0) {
|
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
|
cache = cipher
|
.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
|
} else {
|
cache = cipher
|
.doFinal(encryptedData, offSet, inputLen - offSet);
|
}
|
out.write(cache, 0, cache.length);
|
i++;
|
offSet = i * MAX_DECRYPT_BLOCK;
|
}
|
byte[] decryptedData = out.toByteArray();
|
out.close();
|
return decryptedData;
|
}
|
|
/**
|
* <p>
|
* 公钥加密
|
* </p>
|
*
|
* @param data
|
* 源数据
|
* @param publicKey
|
* 公钥(BASE64编码)
|
* @return
|
* @throws Exception
|
*/
|
public static byte[] encryptByPublicKey(byte[] data, String publicKey)
|
throws Exception {
|
byte[] keyBytes = Base64Utils.decode(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(DEFAULT_ALGORITHM);// keyFactory.getAlgorithm()解决javax.crypto.BadPaddingException:
|
// Blocktype异常的几种解决办法
|
cipher.init(Cipher.ENCRYPT_MODE, publicK);
|
int inputLen = data.length;
|
ByteArrayOutputStream out = new ByteArrayOutputStream();
|
int offSet = 0;
|
byte[] cache;
|
int i = 0;
|
// 对数据分段加密
|
while (inputLen - offSet > 0) {
|
if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
|
cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
|
} else {
|
cache = cipher.doFinal(data, offSet, inputLen - offSet);
|
}
|
out.write(cache, 0, cache.length);
|
i++;
|
offSet = i * MAX_ENCRYPT_BLOCK;
|
}
|
byte[] encryptedData = out.toByteArray();
|
out.close();
|
return encryptedData;
|
}
|
|
/**
|
* <p>
|
* 私钥加密
|
* </p>
|
*
|
* @param data
|
* 源数据
|
* @param privateKey
|
* 私钥(BASE64编码)
|
* @return
|
* @throws Exception
|
*/
|
public static byte[] encryptByPrivateKey(byte[] data, String privateKey)
|
throws Exception {
|
byte[] keyBytes = Base64Utils.decode(privateKey);
|
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
|
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
|
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
|
Cipher cipher = Cipher.getInstance(DEFAULT_ALGORITHM);
|
cipher.init(Cipher.ENCRYPT_MODE, privateK);
|
int inputLen = data.length;
|
ByteArrayOutputStream out = new ByteArrayOutputStream();
|
int offSet = 0;
|
byte[] cache;
|
int i = 0;
|
// 对数据分段加密
|
while (inputLen - offSet > 0) {
|
if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
|
cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
|
} else {
|
cache = cipher.doFinal(data, offSet, inputLen - offSet);
|
}
|
out.write(cache, 0, cache.length);
|
i++;
|
offSet = i * MAX_ENCRYPT_BLOCK;
|
}
|
byte[] encryptedData = out.toByteArray();
|
out.close();
|
return encryptedData;
|
}
|
|
/**
|
* <p>
|
* 获取私钥
|
* </p>
|
*
|
* @param keyMap
|
* 密钥对
|
* @return
|
* @throws Exception
|
*/
|
public static String getPrivateKey(Map<String, Object> keyMap)
|
throws Exception {
|
Key key = (Key) keyMap.get(PRIVATE_KEY);
|
return Base64Utils.encode(key.getEncoded());
|
}
|
|
/**
|
* <p>
|
* 获取公钥
|
* </p>
|
*
|
* @param keyMap
|
* 密钥对
|
* @return
|
* @throws Exception
|
*/
|
public static String getPublicKey(Map<String, Object> keyMap)
|
throws Exception {
|
Key key = (Key) keyMap.get(PUBLIC_KEY);
|
return Base64Utils.encode(key.getEncoded());
|
}
|
|
public static PublicKey getPublicKey(String key) throws Exception {
|
byte[] keyBytes;
|
keyBytes = Base64Utils.decode(key);
|
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
|
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
|
PublicKey publicKey = keyFactory.generatePublic(keySpec);
|
return publicKey;
|
}
|
|
public static byte[] encrypt(PublicKey pubkey, String text) {
|
try {
|
Cipher rsa;
|
rsa = Cipher.getInstance(DEFAULT_ALGORITHM);
|
rsa.init(Cipher.ENCRYPT_MODE, pubkey);
|
return rsa.doFinal(text.getBytes());
|
} catch (Exception e) {
|
e.printStackTrace();
|
}
|
return null;
|
}
|
|
public static String decrypt(PrivateKey decryptionKey, byte[] buffer) {
|
try {
|
Cipher rsa;
|
rsa = Cipher.getInstance(DEFAULT_ALGORITHM);
|
rsa.init(Cipher.DECRYPT_MODE, decryptionKey);
|
byte[] utf8 = rsa.doFinal(buffer);
|
return new String(utf8, "UTF8");
|
} catch (Exception e) {
|
e.printStackTrace();
|
}
|
return null;
|
}
|
|
}
|
