RSA非对称加密算法（Java实现）

废话不多说，直接上代码

public class RSAService {private static final String RSA = "RSA";private static final String PUBLIC_KEY = "xxx";private static final String PRIVATE_KEY = "xxx";public static void main(String[] args) throws Exception {// 生成密钥对KeyPair keyPair = generateKeyPair();PublicKey publicKey = keyPair.getPublic();PrivateKey privateKey = keyPair.getPrivate();// 公钥和私钥的Base64编码表示String publicKeyBase64 = Base64.getUrlEncoder().encodeToString(publicKey.getEncoded());String privateKeyBase64 = Base64.getUrlEncoder().encodeToString(privateKey.getEncoded());System.out.println("公钥: " + publicKeyBase64);System.out.println("私钥: " + privateKeyBase64);RSAService rsaService = new RSAService();// 原文HashMap<String, Object> map = new HashMap<>();map.put("data", "Hello, RSA!");// 公钥加密String encryptedText = rsaService.encrypt(JSON.toJSONString(map));System.out.println("加密后: " + encryptedText);// 私钥解密String decryptedText = rsaService.decrypt(encryptedText);}// 生成密钥对public static KeyPair generateKeyPair() throws Exception {KeyPairGenerator keyGen = KeyPairGenerator.getInstance(RSA);keyGen.initialize(2048);return keyGen.generateKeyPair();}// 使用公钥加密public String encrypt(String data) throws Exception {byte[] keyBytes = Base64.getUrlDecoder().decode(PUBLIC_KEY);X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes);KeyFactory keyFactory = KeyFactory.getInstance(RSA);PublicKey publicKey = keyFactory.generatePublic(spec);Cipher cipher = Cipher.getInstance(RSA);cipher.init(Cipher.ENCRYPT_MODE, publicKey);byte[] bytes = cipher.doFinal(data.getBytes());//二进制码转字符串String base64Encoded = Base64.getUrlEncoder().encodeToString(bytes);return base64Encoded;}// 使用私钥解密public String decrypt(String data) throws Exception {byte[] keyBytes = Base64.getUrlDecoder().decode(PRIVATE_KEY);byte[] dataBytes = Base64.getUrlDecoder().decode(data);PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(keyBytes);KeyFactory keyFactory = KeyFactory.getInstance(RSA);PrivateKey privateKey = keyFactory.generatePrivate(spec);Cipher cipher = Cipher.getInstance(RSA);cipher.init(Cipher.DECRYPT_MODE, privateKey);byte[] bytes = cipher.doFinal(dataBytes);return new String(bytes);}
}