签名过程（对post方法的body进行签名）：
- 发送者通过私钥privateKey对数据进行加签，得到签名串sign
- 发送者将sign和数据一起包装成json格式发送给接收方
TreeMap map = new TreeMap(new MComparator());
map.put("jag", 234);
map.put("jay", 3344);
String str = JSONObject.toJSONString(map);
System.out.println("\n原文:" + str);
byte[] signature = sign(str.getBytes(), privateKey);
String sign = Base64.encodeBase64String(signature);
验签过程：
- 接受者通过公钥publicKey对数据进行验签
- 签名的验签和加签通过多种加密算法实现
byte[] bodyBytes = StreamUtils.copyToByteArray(httpServletRequest.getInputStream());
String body = new String(bodyBytes, httpServletRequest.getCharacterEncoding());
logger.info("请求体：{}", body);
// Map<String, Object> map = JSON.parseObject(body,Map.class);
Map<String, Object> map = JsonUtil.jsonToMap(body);
String signStr = String.valueOf(map.get("sign"));
byte[] sign = org.apache.commons.codec.binary.Base64.decodeBase64(signStr);
map.remove("sign");
Set set = map.keySet();
Iterator it = set.iterator();
TreeMap tm = new TreeMap(new RSAUtil.MComparator());
while (it.hasNext()) {
String key = String.valueOf(it.next());
tm.put(key, map.get(key));
}
Map<String, Object> keyMap = RSAUtil.initKey();
String publicKey = RSAUtil.publicKey;
String mapSortStr = JSONObject.toJSONString(tm);
logger.info("传过来的字符串：mapSortStr：{}", mapSortStr);
//公钥验证
boolean flagB = RSAUtil.verify(mapSortStr.getBytes(), sign, publicKey);
工具类参考
public class RSAUtil {
public static final String KEY_ALGORITHM = "RSA";
public static final String PUBLIC_KEY = "RSAPublicKey";
public static final String PRIVATE_KEY = "RSAPrivateKey";
public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
public static String publicKey = "xxx";
public static String privateKey = "xxx";
/**
* 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 = 2048;
//获得公钥字符串
public static String getPublicKeyStr(Map<String, Object> keyMap) throws Exception {
//获得map中的公钥对象 转为key对象
Key key = (Key) keyMap.get(PUBLIC_KEY);
//编码返回字符串
return encryptBASE64(key.getEncoded());
}
//获得私钥字符串
public static String getPrivateKeyStr(Map<String, Object> keyMap) throws Exception {
//获得map中的私钥对象 转为key对象
Key key = (Key) keyMap.get(PRIVATE_KEY);
//编码返回字符串
return encryptBASE64(key.getEncoded());
}
//获取公钥
public static PublicKey getPublicKey(String key) throws Exception {
byte[] keyBytes;
keyBytes = (new BASE64Decoder()).decodeBuffer(key);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PublicKey publicKey = keyFactory.generatePublic(keySpec);
return publicKey;
}
//获取私钥
public static PrivateKey getPrivateKey(String key) throws Exception {
byte[] keyBytes;
keyBytes = (new BASE64Decoder()).decodeBuffer(key);
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
return privateKey;
}
//解码返回byte
public static byte[] decryptBASE64(String key) throws Exception {
return (new BASE64Decoder()).decodeBuffer(key);
}
//编码返回字符串
public static String encryptBASE64(byte[] key) throws Exception {
return (new BASE64Encoder()).encodeBuffer(key);
}
//***************************签名和验证*******************************
public static byte[] sign(byte[] data, String privateKeyStr) throws Exception {
PrivateKey priK = getPrivateKey(privateKeyStr);
Signature sig = Signature.getInstance(SIGNATURE_ALGORITHM);
sig.initSign(priK);
sig.update(data);
return sig.sign();
}
// 验签
public static boolean verify(byte[] data, byte[] sign, String publicKeyStr) throws Exception {
PublicKey pubK = getPublicKey(publicKeyStr);
Signature sig = Signature.getInstance(SIGNATURE_ALGORITHM);
sig.initVerify(pubK);
sig.update(data);
return sig.verify(sign);
}
//************************加密解密**************************
public static byte[] encrypt(byte[] plainText, String publicKeyStr) throws Exception {
PublicKey publicKey = getPublicKey(publicKeyStr);
Cipher cipher = Cipher.getInstance(KEY_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
int inputLen = plainText.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
int i = 0;
byte[] cache;
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
cache = cipher.doFinal(plainText, offSet, MAX_ENCRYPT_BLOCK);
} else {
cache = cipher.doFinal(plainText, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_ENCRYPT_BLOCK;
}
byte[] encryptText = out.toByteArray();
out.close();
return encryptText;
}
public static byte[] decrypt(byte[] encryptText, String privateKeyStr) throws Exception {
PrivateKey privateKey = getPrivateKey(privateKeyStr);
Cipher cipher = Cipher.getInstance(KEY_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, privateKey);
int inputLen = encryptText.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(encryptText, offSet, MAX_DECRYPT_BLOCK);
} else {
cache = cipher.doFinal(encryptText, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_DECRYPT_BLOCK;
}
byte[] plainText = out.toByteArray();
out.close();
return plainText;
}
public static void main(String[] args) {
Map<String, Object> keyMap;
byte[] cipherText;
String input = "Hello World!";
try {
keyMap = initKey();
//String publicKey = getPublicKeyStr(keyMap);
System.out.println("公钥------------------");
System.out.println(publicKey);
//String privateKey = getPrivateKeyStr(keyMap);
System.out.println("私钥------------------");
System.out.println(privateKey);
System.out.println("测试可行性-------------------");
System.out.println("明文=======" + input);
cipherText = encrypt(input.getBytes(), publicKey);
//加密后的东西
System.out.println("密文=======" + new String(cipherText));
//开始解密
byte[] plainText = decrypt(cipherText, privateKey);
System.out.println("解密后明文===== " + new String(plainText));
System.out.println("验证签名-----------");
TreeMap map = new TreeMap(new MComparator());
map.put("jag", 234);
map.put("jay", 3344);
String str = JSONObject.toJSONString(map);
System.out.println("\n原文:" + str);
byte[] signature = sign(str.getBytes(), privateKey);
System.out.println(Base64.encodeBase64String(signature));
boolean status = verify(str.getBytes(), signature, publicKey);
System.out.println("验证情况：" + status);
} catch (Exception e) {
e.printStackTrace();
}
}
public static Map<String, Object> initKey() throws Exception {
KeyPairGenerator keyPairGen = KeyPairGenerator
.getInstance(KEY_ALGORITHM);
keyPairGen.initialize(1024);
KeyPair keyPair = keyPairGen.generateKeyPair();
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;
}
public static class MComparator implements Comparator {
public int compare(Object obj1, Object obj2) {
String ele1 = (String) obj1;
String ele2 = (String) obj2;
return ele2.compareTo(ele1);
}
}
}
Base64Util 主要用于传输内容加解密用
package com.sinochemitech.util;
import org.apache.commons.codec.binary.Base64;
public class Base64Util{
/**
* Decoding to binary
* @param base64 base64
* @return byte
* @throws Exception Exception
*/
public static byte[] decode(String base64) throws Exception {
return Base64.decodeBase64(base64);
}
/**
* Binary encoding as a string
* @param bytes byte
* @return String
* @throws Exception Exception
*/
public static String encode(byte[] bytes) throws Exception {
return new String(Base64.encodeBase64(bytes));
}
}
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