RSA加密方式
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.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.Cipher;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class RSAUtils {
private static Log log = LogFactory.getLog(RSAUtils.class);
private static final String KEYALGORITHM = "RSA";
private static final String SIGNATUREALGORITHM = "MD5withRSA";
private static final String PUBLICKEY = "RSAPublicKey";
private static final String PRIVATEKEY = "RSAPrivateKey";
//rsa私钥 或者可从配置文件读取。
public static final String DECRYPTPRIVATEKEY = "MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAIMzJa4oZpQcPhRDTIaWnF4olSaeGt5oV0XFwoeeSK+FZ3lc4N34523tdfasgba";
private RSAUtils(){super();}
public static byte[] decryptBASE64(String key) {
Base64 base64 = new Base64();
return base64.decode(key);
}
public static String encryptBASE64(byte[] bytes) {
Base64 base64 = new Base64();
return base64.encodeToString(bytes);
}
/**
*
*
* @param data
*
* @param privateKey
*
* @return
* @throws Exception
*/
public static String sign(byte[] data, String privateKey){
try {
byte[] keyBytes = decryptBASE64(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEYALGORITHM);
PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);
Signature signature = Signature.getInstance(SIGNATUREALGORITHM);
signature.initSign(priKey);
signature.update(data);
return encryptBASE64(signature.sign());
}catch (Exception e){
log.error("RSAUtilsSignError");
return "";
}
}
/**
*
*
* @param data
*
* @param publicKey
*
* @param sign
*
* @return
* @throws Exception
*/
public static boolean verify(byte[] data, String publicKey, String sign){
try {
byte[] keyBytes = decryptBASE64(publicKey);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEYALGORITHM);
PublicKey pubKey = keyFactory.generatePublic(keySpec);
Signature signature = Signature.getInstance(SIGNATUREALGORITHM);
signature.initVerify(pubKey);
signature.update(data);
return signature.verify(decryptBASE64(sign));
}catch (Exception e){
log.error("RSAUtilsVerifySignError");
return false;
}
}
public static byte[] decryptByPrivateKey(byte[] data, String key){
try {
byte[] keyBytes = decryptBASE64(key);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEYALGORITHM);
Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, privateKey);
return cipher.doFinal(data);
}catch (Exception e){
log.error("RSAUtilsPrivateKeyDecryptError");
return new byte[0];
}
}
/**
*
* @param data
* @param key
* @return
* @throws Exception
*/
public static byte[] decryptByPrivateKey(String data, String key){
return decryptByPrivateKey(decryptBASE64(data), key);
}
/**
*
* @param data
* @param key
* @return
* @throws Exception
*/
public static byte[] decryptByPublicKey(byte[] data, String key){
try {
byte[] keyBytes = decryptBASE64(key);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEYALGORITHM);
Key publicKey = keyFactory.generatePublic(x509KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, publicKey);
return cipher.doFinal(data);
}catch (Exception e){
log.error("RSAUtilsPublicKeyDecryptError");
return new byte[0];
}
}
/**
*
* @param data
* @param key
* @return
* @throws Exception
*/
public static byte[] encryptByPublicKey(String data, String key) {
try {
byte[] keyBytes = decryptBASE64(key);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEYALGORITHM);
Key publicKey = keyFactory.generatePublic(x509KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return cipher.doFinal(data.getBytes());
}catch (Exception e){
log.error("RSAUtilsPublicKeyEncryptError");
return new byte[0];
}
}
/**
*
* @param data
* @param key
* @return
* @throws Exception
*/
public static byte[] encryptByPrivateKey(byte[] data, String key){
try {
byte[] keyBytes = decryptBASE64(key);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEYALGORITHM);
Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
return cipher.doFinal(data);
}catch (Exception e){
log.error("RSAUtilsPrivateKeyEncryptError");
return new byte[0];
}
}
/**
*
* @param keyMap
* @return
* @throws Exception
*/
public static String getPrivateKey(Map<String, Key> keyMap){
if(keyMap != null){
Key key = keyMap.get(PRIVATEKEY);
return encryptBASE64(key.getEncoded());
}else{
return "";
}
}
/**
*
* @param keyMap
* @return
* @throws Exception
*/
public static String getPublicKey(Map<String, Key> keyMap){
if(keyMap != null){
Key key = keyMap.get(PUBLICKEY);
return encryptBASE64(key.getEncoded());
}else {
return "";
}
}
/**
*
* @return
* @throws Exception
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
public static Map<String, Key> initKey(){
try {
KeyPairGenerator keyPairGen = KeyPairGenerator
.getInstance(KEYALGORITHM);
keyPairGen.initialize(2048);
KeyPair keyPair = keyPairGen.generateKeyPair();
Map<String, Key> keyMap = new HashMap(2);
keyMap.put(PUBLICKEY, keyPair.getPublic());
keyMap.put(PRIVATEKEY, keyPair.getPrivate());
return keyMap;
} catch (NoSuchAlgorithmException e) {
log.error("RSAUtilsInitKeyError");
return null;
}
}
}
获取RSA密钥
import java.security.Key;
import java.util.Map;
public class RSA {
private static Map<String,Key> map;
static{
loadProps();
}
synchronized static private void loadProps(){
map = RSAUtils.initKey();
}
public static String getPrivateKey(){
return RSAUtils.getPrivateKey(map);
}
public static String getPublicKey(){
return RSAUtils.getPublicKey(map);
}
}
加密
var encrypt = new JSEncrypt();
encrypt.setPublicKey(公钥);
//password为加密密码
var password = encrypt.encrypt(密码明文);
公钥获取方式 后台
公钥 = RSA.getPublicKey()；
解密
byte[] decryptData = RSAUtils.decryptByPrivateKey(passWord,RSA.getPrivateKey());
passWord = new String(decryptData);
js库
[jsencrypt](https://github.com/travist/jsencrypt).min.js下载地址：
[github主页]([https://github.com/travist/jsencrypt])
[官方网站]([http://travistidwell.com/jsencrypt/])
jq库：
<script src="http://code.jquery.com/jquery-1.8.3.min.js "></script>
### (注！jquery-2.0以上版本不再支持IE 6/7/8) 并不是最新的版本就最好的，而是根据您项目需求所适合的版本！
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