des 3des 对称加密 唯一key 既可以加密 又可以解密 rsa sm2 非对称密钥 公钥和私钥 sha md5 散列hash 使用des 数据加解密，使用rsa对des 的key 进行加解密，保证数据的高效率传输
下面有rsa.js 的压缩包
public class RsaResponse {
public int code;
public String publicKeyExponent;
public String publicKeyModulus;
}
import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.Security;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.RSAPublicKeySpec;
import java.util.HashMap;
import javax.crypto.Cipher;
public class RSAUtils
{
/**
* 生成公钥和私钥
*
* @throws NoSuchAlgorithmException
*
*/
public static HashMap getKeys() throws NoSuchAlgorithmException
{
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
HashMap map = new HashMap();
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA",
new org.bouncycastle.jce.provider.BouncyCastleProvider());
keyPairGen.initialize(1024);
KeyPair keyPair = keyPairGen.generateKeyPair();
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
map.put("public", publicKey);
map.put("private", privateKey);
return map;
}
/**
* 使用模和指数生成RSA公钥
*
* @param modulus
* 模
* @param exponent
* 指数
* @return
*/
public static RSAPublicKey getPublicKey(String modulus, String exponent)
{
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
try
{
BigInteger b1 = new BigInteger(modulus);
BigInteger b2 = new BigInteger(exponent);
KeyFactory keyFactory = KeyFactory.getInstance("RSA",
new org.bouncycastle.jce.provider.BouncyCastleProvider());
RSAPublicKeySpec keySpec = new RSAPublicKeySpec(b1, b2);
return (RSAPublicKey) keyFactory.generatePublic(keySpec);
}
catch (Exception e)
{
e.printStackTrace();
return null;
}
}
/**
* 使用模和指数生成RSA私钥 /None/NoPadding
*
* @param modulus
* 模
* @param exponent
* 指数
* @return
*/
public static RSAPrivateKey getPrivateKey(String modulus, String exponent)
{
try
{
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
BigInteger b1 = new BigInteger(modulus);
BigInteger b2 = new BigInteger(exponent);
KeyFactory keyFactory = KeyFactory.getInstance("RSA",
new org.bouncycastle.jce.provider.BouncyCastleProvider());
RSAPrivateKeySpec keySpec = new RSAPrivateKeySpec(b1, b2);
return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
}
catch (Exception e)
{
e.printStackTrace();
return null;
}
}
/**
* 公钥加密
*
* @param data
* @param publicKey
* @return
* @throws Exception
*/
public static String encryptByPublicKey(String data, RSAPublicKey publicKey) throws Exception
{
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
Cipher cipher = Cipher.getInstance("RSA", new org.bouncycastle.jce.provider.BouncyCastleProvider());
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
// 模长
int key_len = publicKey.getModulus().bitLength() / 8;
// 加密数据长度 <= 模长-11
String[] datas = splitString(data, key_len - 11);
String mi = "";
// 如果明文长度大于模长-11则要分组加密
for (String s : datas)
{
mi += bcd2Str(cipher.doFinal(s.getBytes()));
}
return mi;
}
/**
* 私钥解密
*
* @param data
* @param privateKey
* @return
* @throws Exception
*/
public static String decryptByPrivateKey(String data, RSAPrivateKey privateKey) throws Exception
{
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
Cipher cipher = Cipher.getInstance("RSA", new org.bouncycastle.jce.provider.BouncyCastleProvider());
cipher.init(Cipher.DECRYPT_MODE, privateKey);
// 模长
int key_len = privateKey.getModulus().bitLength() / 8;
byte[] bytes = data.getBytes();
byte[] bcd = ASCII_To_BCD(bytes, bytes.length);
// System.err.println(bcd.length);
// 如果密文长度大于模长则要分组解密
String ming = "";
byte[][] arrays = splitArray(bcd, key_len);
for (byte[] arr : arrays)
{
ming += new String(cipher.doFinal(arr));
}
return ming;
}
/**
* ASCII码转BCD码
*
*/
public static byte[] ASCII_To_BCD(byte[] ascii, int asc_len)
{
byte[] bcd = new byte[asc_len / 2];
int j = 0;
for (int i = 0; i < (asc_len + 1) / 2; i++)
{
bcd[i] = asc_to_bcd(ascii[j++]);
bcd[i] = (byte) (((j >= asc_len) ? 0x00 : asc_to_bcd(ascii[j++])) + (bcd[i] << 4));
}
return bcd;
}
public static byte asc_to_bcd(byte asc)
{
byte bcd;
if ((asc >= '0') && (asc <= '9'))
bcd = (byte) (asc - '0');
else if ((asc >= 'A') && (asc <= 'F'))
bcd = (byte) (asc - 'A' + 10);
else if ((asc >= 'a') && (asc <= 'f'))
bcd = (byte) (asc - 'a' + 10);
else
bcd = (byte) (asc - 48);
return bcd;
}
/**
* BCD转字符串
*/
public static String bcd2Str(byte[] bytes)
{
char temp[] = new char[bytes.length * 2], val;
for (int i = 0; i < bytes.length; i++)
{
val = (char) (((bytes[i] & 0xf0) >> 4) & 0x0f);
temp[i * 2] = (char) (val > 9 ? val + 'A' - 10 : val + '0');
val = (char) (bytes[i] & 0x0f);
temp[i * 2 + 1] = (char) (val > 9 ? val + 'A' - 10 : val + '0');
}
return new String(temp);
}
/**
* 拆分字符串
*/
public static String[] splitString(String string, int len)
{
int x = string.length() / len;
int y = string.length() % len;
int z = 0;
if (y != 0)
{
z = 1;
}
String[] strings = new String[x + z];
String str = "";
for (int i = 0; i < x + z; i++)
{
if (i == x + z - 1 && y != 0)
{
str = string.substring(i * len, i * len + y);
}
else
{
str = string.substring(i * len, i * len + len);
}
strings[i] = str;
}
return strings;
}
/**
*拆分数组
*/
public static byte[][] splitArray(byte[] data, int len)
{
int x = data.length / len;
int y = data.length % len;
int z = 0;
if (y != 0)
{
z = 1;
}
byte[][] arrays = new byte[x + z][];
byte[] arr;
for (int i = 0; i < x + z; i++)
{
arr = new byte[len];
if (i == x + z - 1 && y != 0)
{
System.arraycopy(data, i * len, arr, 0, y);
}
else
{
System.arraycopy(data, i * len, arr, 0, len);
}
arrays[i] = arr;
}
return arrays;
}
// public static void main(String[] args) throws Exception{
// HashMap map = getKeys();
// //生成公钥和私钥
// RSAPublicKey publicKey = (RSAPublicKey) map.get("public");
// RSAPrivateKey privateKey = (RSAPrivateKey) map.get("private");
//
// //模
// String modulus = publicKey.getModulus().toString();
// System.out.println("pubkey modulus="+modulus);
// //公钥指数
// String public_exponent = publicKey.getPublicExponent().toString();
// System.out.println("pubkey exponent="+public_exponent);
// //私钥指数
// String private_exponent = privateKey.getPrivateExponent().toString();
// System.out.println("private exponent="+private_exponent);
// //明文
// String ming = "111";
// //使用模和指数生成公钥和私钥
// RSAPublicKey pubKey = RSAUtils.getPublicKey(modulus, public_exponent);
// RSAPrivateKey priKey = RSAUtils.getPrivateKey(modulus, private_exponent);
// //加密后的密文
// String mi = RSAUtils.encryptByPublicKey(ming, pubKey);
// System.err.println("mi="+mi);
// //解密后的明文
// String ming2 = RSAUtils.decryptByPrivateKey(mi, priKey);
// System.err.println("ming2="+ming2);
// }
}
//获取密钥
/**
* 对str做RSA加密，密钥是key,返回加密好的字符串
*/
function encrypPassword(str, key){
str = str.split("").reverse().join("");
var encrypedPwd = RSAUtils.encryptedString(key, str);
return encrypedPwd;
}
/*<%-- //'<%=request.getContextPath()%>/user/rsaKey.action' --%>
*/
function rsaKey(element) {
$.ajax({
cache: true,
type: "get",
url:'/FusionAbility/user/rsaKey.action',
dataType: "json",
async: false,
error: function(data) {
alert("请刷新页面后重新登录");
},
success: function(data) {
RSAUtils.setMaxDigits(200);
key = new RSAUtils.getKeyPair(data.publicKeyExponent, "", data.publicKeyModulus);
console.log(element.val());
element.val(encrypPassword(element.val(), key));
console.log(element.val());
}
});
}
public void rsaKey() {
RsaResponse rsaRsp = new RsaResponse();
Map map;
try {
map = RSAUtils.getKeys();
RSAPublicKey publicKey = (RSAPublicKey) map.get("public");
RSAPrivateKey privateKey = (RSAPrivateKey) map.get("private");
getRequest().getSession().setAttribute("privateKey", privateKey);
rsaRsp.publicKeyExponent = publicKey.getPublicExponent().toString(
16);
rsaRsp.publicKeyModulus = publicKey.getModulus().toString(16);
rsaRsp.code = 200;
getResponse().getWriter().write(JSONArray.toJSONString(rsaRsp));
} catch (Exception e) {
logger.info("", e);
e.printStackTrace();
rsaRsp.code = 0;
}
//getRequest().setAttribute("rsaRsp", rsaRsp);
}
//RSA解密
String password=user.getUserpswd();
RSAPrivateKey privateKey = (RSAPrivateKey)getRequest().getSession().getAttribute("privateKey");
if(privateKey!=null){
password = RSAUtils.decryptByPrivateKey(password, privateKey);
user.setUserpswd(password);
}else{
return "index";
}
function loginSubmit(){
var ele = $("#userpswd");
rsaKey(ele);
$.ajax({
cache: true,
type: "POST",
url:'<%=request.getContextPath()%>/user/login
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