java 非对称加密算法RSA实现详解

java 非对称加密算法RSA实现详解

现在就为大家介绍一种基于因子分解的RSA算法，这种加密算法有两种实现形式：1、公钥加密，私钥解密；2、私钥加密，公钥解密。下面就为大家分析一下实现代码，相对于DH算法，bkzsEgmHfqbkzsEgmHfqRSA显得有些简单。

初始化密钥：

KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");

keyPairGenerator.initialize(512);

KeyPair keyPair = keyPairGenerator.generateKeyPair();

RSAPrivateKey rsaprivateKey = (RSAPrivateKey)keyPair.getPrivate();//私有密钥

RSAPublicKey rsapublicKey = (RSAPublicKey)keyPair.getPublic();//公有密钥

System.out.println("privateKey : "+Base64.encodeBase64String(rsaprivateKey.getEncoded()));

System.out.println("publicKey : "+Base64.encodeBase64String(rsapublicKey.getEncoded()));

1、私钥加密，公钥解密：

//私钥加密，公钥解密--加密

PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaprivateKey.getEncoded());

KeyFactory privateKeyFactory = KeyFactory.getInstance("RSA");

PrivateKey privateKey = privateKeyFactory.generatePrivate(pkcs8EncodedKeySpec);

Cipher privateCipher = Cipher.getInstance("RSA");

privateCipher.init(Cipher.ENCRYPT_MODE, privateKey);

byte[] result = privateCipher.doFinal(src.getBytes());

System.out.println("私钥加密，公钥解密--加密:"+Base64.encodeBase64String(result));

//私钥加密，公钥解密--解密

X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rsapublicKey.getEncoded());

KeyFactory publicKeyFactory = KeyFactory.getInstance("RSA");

PublicKey publicKey = publicKeyFactory.generatePublic(x509EncodedKeySpec);

Cipher publicCipher = Cipher.getInstance("RSA");

publicCipher.init(Cipher.DECRYPT_MODE, publicKey);

result = publicCipher.doFinal(result);

System.out.println("私钥加密，公钥解密--解密:"+new String(result));

2、公钥加密，私钥解密：

//公钥加密，私钥解密---加密

x509EncodedKeySpec = new X509EncodedKeySpec(rsapublicKey.getEncoded());

publicKeyFactory = KeyFactory.getInstance("RSA");

publicKey = publicKeyFactory.generatePublic(x509EncodedKeySpec);

publicCipher = Cipher.getInstance("RSA");

publicCipher.init(Cipher.ENCRYPT_MODE, publicKey);

result = publicCipher.doFinal(src.getBytes());

System.out.println("公钥加密，私钥解密---加密:"+Base64.encodeBase64String(result));

//公钥加密，私钥解密---解密

pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaprivateKey.getEncoded());

privateKeyFactory = KeyFactory.getInstance("RSA");

privateKey = privateKeyFactory.generatePrivate(pkcs8EncodedKeySpec);

privateCipher = Cipher.getInstance("RSA");

privateCipher.init(Cipher.DECRYPT_MODE, privateKey);

result = privateCipher.doFinal(result);

System.out.println("公钥加密，私钥解密---解密:"+new String(result));

根据输出的结果不难发现，公钥和私钥并不一致，私钥的长度要大于公钥。

版权声明：本文内容由网络用户投稿，版权归原作者所有，本站不拥有其著作权，亦不承担相应法律责任。如果您发现本站中有涉嫌抄袭或描述失实的内容，请联系我们jiasou666@gmail.com 处理，核实后本网站将在24小时内删除侵权内容。