話不多說,直接開擼
public class RSAUtils {
private static String PUB_KEY = "xxxxxx";
private static String PRIV_KEY ="xxxxxx";
public static Map<Integer, String> genKeyPair() {
Map<Integer, String> keyMap = new HashMap<Integer, String>(); // 用於封裝隨機產生的公鑰與私鑰
try {
// KeyPairGenerator類用於生成公鑰和私鑰對,基於RSA算法生成對象
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
// 初始化密鑰對生成器,密鑰大小為96-1024位
keyPairGen.initialize(1024, new SecureRandom());
// 生成一個密鑰對,保存在keyPair中
KeyPair keyPair = keyPairGen.generateKeyPair();
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); // 得到私鑰
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); // 得到公鑰
// 得到公鑰字符串
String publicKeyString = new String(Base64.encodeBase64(publicKey.getEncoded()));
// 得到私鑰字符串
String privateKeyString = new String(Base64.encodeBase64((privateKey.getEncoded())));
// 將公鑰和私鑰保存到Map
keyMap.put(0, publicKeyString); // 0表示公鑰
keyMap.put(1, privateKeyString); // 1表示私鑰
} catch (Exception e) {
return null;
}
return keyMap;
}
/**
* RSA公鑰加密
*
* @param str
* 需要加密的字符串
* @param publicKey
* 公鑰
* @return 公鑰加密后的內容
*/
public static String encrypt(String str) {
String outStr = null;
try {
// base64編碼的公鑰
byte[] decoded = Base64.decodeBase64(PUB_KEY);
RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA")
.generatePublic(new X509EncodedKeySpec(decoded));
// RSA加密
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, pubKey);
outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes("UTF-8")));
} catch (Exception e) {
}
return outStr;
}
/**
* RSA私鑰解密
*
* @param str
* 加密字符串
* @param privateKey
* 私鑰
* @return 私鑰解密后的內容
*/
public static String decrypt(String str) {
String outStr = null;
try {
// 64位解碼加密后的字符串
byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8"));
// base64編碼的私鑰
byte[] decoded = Base64.decodeBase64(PRIV_KEY);
RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA")
.generatePrivate(new PKCS8EncodedKeySpec(decoded));
// RSA解密
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, priKey);
outStr = new String(cipher.doFinal(inputByte));
} catch (Exception e) {
}
return outStr;
}
}
這個類有一個生成公鑰和私鑰的方法,還有一個公鑰加密和私鑰解密的方法.我們將公鑰放在前端用來加密,私鑰放在后端用來解密.
前端需要引入jsencrypt.min.js
下載地址: http://travistidwell.com/jsencrypt/
加密方法:

就可以實現前端加密后端解密了
