话不多说,直接开撸
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>(); // 用于封装随机产生的公钥与私钥 try { // KeyPairGenerator类用于生成公钥和私钥对,基于RSA算法生成对象 KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA"); // 初始化密钥对生成器,密钥大小为96-1024位 keyPairGen.initialize(1024, new SecureRandom()); // 生成一个密钥对,保存在keyPair中 KeyPair keyPair = keyPairGen.generateKeyPair(); RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); // 得到私钥 RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); // 得到公钥 // 得到公钥字符串 String publicKeyString = new String(Base64.encodeBase64(publicKey.getEncoded())); // 得到私钥字符串 String privateKeyString = new String(Base64.encodeBase64((privateKey.getEncoded()))); // 将公钥和私钥保存到Map keyMap.put(0, publicKeyString); // 0表示公钥 keyMap.put(1, privateKeyString); // 1表示私钥 } catch (Exception e) { return null; } return keyMap; } /** * RSA公钥加密 * * @param str * 需要加密的字符串 * @param publicKey * 公钥 * @return 公钥加密后的内容 */ public static String encrypt(String str) { String outStr = null; try { // base64编码的公钥 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私钥解密 * * @param str * 加密字符串 * @param privateKey * 私钥 * @return 私钥解密后的内容 */ public static String decrypt(String str) { String outStr = null; try { // 64位解码加密后的字符串 byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8")); // base64编码的私钥 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; } }
这个类有一个生成公钥和私钥的方法,还有一个公钥加密和私钥解密的方法.我们将公钥放在前端用来加密,私钥放在后端用来解密.
前端需要引入jsencrypt.min.js
下载地址: http://travistidwell.com/jsencrypt/
加密方法:
就可以实现前端加密后端解密了