RSA加密解密以及秘钥的生成

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import javax.crypto.Cipher;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
 
public class Demo {
 
    public static void main(String... args) throws Exception {
        d();
    }
 
    public static void d() throws Exception {
 
        //生成密钥对
        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
        keyGen.initialize(2048);
        KeyPair key = keyGen.generateKeyPair();
 
        // 公钥
        byte[] pub = key.getPublic().getEncoded();
        // 私钥
        byte[] pri = key.getPrivate().getEncoded();
 
        // 原文
        byte[] plainText = "你看看".getBytes();
 
        //加密工具
        Cipher c1 = Cipher.getInstance("RSA");
        c1.init(Cipher.ENCRYPT_MODE, key.getPrivate());
        byte[] cipherText = c1.doFinal(plainText);
 
        c1.init(Cipher.DECRYPT_MODE, key.getPublic());
        byte[] output = c1.doFinal(cipherText);
    }
}