RSA使用X509EncodedKeySpec、PKCS8EncodedKeySpec生成公钥和私钥
private static final String KEY_ALGORITHM = "RSA"; private static final String PUBLIC_KEY ="publicKey";private static final String PRIVATE_KEY ="privateKey"; public static void main(String[] args) throws Exception{Map<String,String> keyMap = genKey();RSAPublicKey publicKey = getPublicKey(keyMap.get(PUBLIC_KEY));RSAPrivateKey privateKey = getPrivateKey(keyMap.get(PRIVATE_KEY));String info ="明文123456";//加密byte[] bytes = encrypt(info.getBytes("utf-8"),publicKey);//解密bytes = decrypt(bytes, privateKey);System.out.println(new String(bytes,"utf-8")); }public static Map<String,String> genKey() throws NoSuchAlgorithmException{Map<String,String> keyMap = new HashMap<String,String>();KeyPairGenerator keygen = KeyPairGenerator.getInstance(KEY_ALGORITHM);SecureRandom random = new SecureRandom();// random.setSeed(keyInfo.getBytes());// 初始加密，512位已被破解，用1024位,最好用2048位keygen.initialize(1024, random);// 取得密钥对KeyPair kp = keygen.generateKeyPair();RSAPrivateKey privateKey = (RSAPrivateKey)kp.getPrivate(); String privateKeyString = Base64.encode(privateKey.getEncoded());RSAPublicKey publicKey = (RSAPublicKey)kp.getPublic(); String publicKeyString = Base64.encode(publicKey.getEncoded());keyMap.put(PUBLIC_KEY, publicKeyString);keyMap.put(PRIVATE_KEY, privateKeyString);return keyMap;}public static RSAPublicKey getPublicKey(String publicKey) throws Exception{byte[] keyBytes = LBase64.decode(publicKey);X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes);KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);return (RSAPublicKey) keyFactory.generatePublic(spec);}public static RSAPrivateKey getPrivateKey(String privateKey) throws Exception{byte[] keyBytes = LBase64.decode(privateKey);PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(keyBytes);KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);return (RSAPrivateKey) keyFactory.generatePrivate(spec);}