Java RSA加密算法生成公钥和私钥

打开Eclipse，新建一个Java 工程。 操作：点击“File”-> "New" -> "Java Project"

工程名内输入Keys， 然后点击“Finish”即可

若要使用RSA加密，需要在代码中引入java.security子包， 和Base64加密、解密包。具体如下：

编写生成key map寒暑 initKey, 如图：

编写获取公钥函数及辅助Base64解码函数如图：

主函数(main 函数)中编写测试代码如图：

完整代码： import java.security.Key; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey; import java.util.HashMap; import java.util.Map; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; @SuppressWarnings("unused") public class Keys { public static final String KEY_ALGORITHM = "RSA"; public static final String SIGNATURE_ALGORITHM = "MD5withRSA"; private static final String PUBLIC_KEY = "RSAPublicKey"; private static final String PRIVATE_KEY = "RSAPrivateKey"; public static void main(String[] args) { Map<String, Object> keyMap; try { keyMap = initKey(); String publicKey =  getPublicKey(keyMap); System.out.println(publicKey); String privateKey =  getPrivateKey(keyMap); System.out.println(privateKey); } catch (Exception e) { e.printStackTrace(); } } public static String getPublicKey(Map<String, Object> keyMap) throws Exception { Key key = (Key) keyMap.get(PUBLIC_KEY); byte[] publicKey = key.getEncoded(); return encryptBASE64(key.getEncoded()); } public static String getPrivateKey(Map<String, Object> keyMap) throws Exception { Key key = (Key) keyMap.get(PRIVATE_KEY); byte[] privateKey =key.getEncoded(); return encryptBASE64(key.getEncoded()); } public static byte[] decryptBASE64(String key) throws Exception { return (new BASE64Decoder()).decodeBuffer(key); } public static String encryptBASE64(byte[] key) throws Exception { return (new BASE64Encoder()).encodeBuffer(key); } 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; } }

测试结果：