爪哇中使用南非共和国(南非共和国)算法加密概述RSA加密算法是一种非对称加密算法 　　

　　

　　南非共和国(南非共和国)加密的方式使用公钥加密的数据，利用私钥进行解密使用私钥加密的数据，利用公钥进行解密南非共和国(南非共和国)是一对密钥。分别是公钥和私钥,这个公钥和私钥其实就是一组数字！其二进制位长度可以是1024位或者2048位。长度越长其加密强度越大，目前为止公之于众的能破解的最大长度为768位密钥，只要高于768位，相对就比较安全。南非共和国(南非共和国)加密的缺点由于南非共和国(南非共和国)算法的原理都是大数计算，使得南非共和国(南非共和国)最快的情况也比对称加密算法慢上好几倍。 　　

　　

　　public class RSA utils { public static String RSA _ ALGORITHM=' RSA '；公共静态字符串UTF8=' UTF-8 '；/** * 密钥长度，DSA算法的默认密钥长度是1024 * 密钥长度必须是64的倍数，在512到65536位之间* */private static final int KEY _ SIZE=1024；公共静态void main(字符串参数)引发异常{ String password=' 1234 ABCD 5678 '；密钥库密钥=create keys()；字节公钥=获取公钥(keys)；字节私钥=get private key(keys)；System.out.println('公钥：' base64。encode(公钥))；System.out.println('私钥：' base64。encode(私钥))；byte encryptByPublicKey=encryptByPublicKey(密码。getbytes()，公钥)；System.out.println('使用公钥加密后的数据：' base64。encode(encryptByPublicKey))；byte decryptByPrivateKey=decryptByPrivateKey(encryptByPublicKey，privateKey)；System.out.println('使用私钥解密后的数据：'新字符串(decryptByPrivateKey))；} /** * 生成密钥对* @返回密钥对对象* @ throws nosuch算法异常*/公共静态密钥库create keys()throws nosuch算法异常{//密钥对生成器用于生成公钥和私钥对。密钥对生成器是使用getInstance工厂方法KeyPairGenerator。getinstance(RSA _ ALGORITHM)；密钥对生成器。initialize(KEY _ SIZE)；密钥对密钥对=密钥对生成器。generatekeypair()；RSA private key private key=(RSA private key)密钥对。get private()；RSA公钥公钥=(RSA公钥)密钥对。get public()；密钥库密钥库=新的KeyStore(公钥，私钥)；返回密钥库；} /** * 获取私钥* @ param keyStore * @ return */private static byte get private key(keyStore keyStore){ return((RSA私钥)keyStore。私钥).获取编码()；} /** * 获取公钥* @ param keyStore * @ return */private 　　

static byte<> getPublicKey(KeyStore keyStore){ return ((RSAPublicKey)keyStore.publicKey).getEncoded(); } /** * 私钥加密 * @param data 待加密数据 * @param key 密钥 * @return byte<> 加密数据 * */ public static byte<> encryptByPrivateKey(byte<> data,byte<> key) throws Exception{ //取得私钥 PKCS8EncodedKeySpec pkcs8KeySpec=new PKCS8EncodedKeySpec(key); KeyFactory keyFactory=KeyFactory.getInstance(RSA_ALGORITHM); //生成私钥 PrivateKey privateKey=keyFactory.generatePrivate(pkcs8KeySpec); //数据加密 Cipher cipher=Cipher.getInstance(keyFactory.getAlgorithm()); cipher.init(Cipher.ENCRYPT_MODE, privateKey); return cipher.doFinal(data); } /** * 公钥加密 * @param data * @param key * @return * @throws NoSuchAlgorithmException * @throws InvalidKeySpecException * @throws NoSuchPaddingException * @throws BadPaddingException * @throws IllegalBlockSizeException * @throws InvalidKeyException */ private static byte<> encryptByPublicKey(byte<> data, byte<> key) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, BadPaddingException, IllegalBlockSizeException, InvalidKeyException { //实例化密钥工厂 KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM); //初始化公钥,根据给定的编码密钥创建一个新的 X509EncodedKeySpec。 X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(key); PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec); //数据加密 Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm()); cipher.init(Cipher.ENCRYPT_MODE,publicKey); return cipher.doFinal(data); } /** * 私钥解密 * @param data 待解密数据 * @param key 密钥 * @return byte<> 解密数据 * */ public static byte<> decryptByPrivateKey(byte<> data,byte<> key) throws Exception{ //取得私钥 PKCS8EncodedKeySpec pkcs8KeySpec=new PKCS8EncodedKeySpec(key); KeyFactory keyFactory=KeyFactory.getInstance(RSA_ALGORITHM); //生成私钥 PrivateKey privateKey=keyFactory.generatePrivate(pkcs8KeySpec); //数据解密 Cipher cipher=Cipher.getInstance(keyFactory.getAlgorithm()); cipher.init(Cipher.DECRYPT_MODE, privateKey); return cipher.doFinal(data); } /** * 公钥解密 * @param data 待解密数据 * @param key 密钥 * @return byte<> 解密数据 * */ public static byte<> decryptByPublicKey(byte<> data,byte<> key) throws Exception{ //实例化密钥工厂 KeyFactory keyFactory=KeyFactory.getInstance(RSA_ALGORITHM); //初始化公钥 //密钥材料转换 X509EncodedKeySpec x509KeySpec=new X509EncodedKeySpec(key); //产生公钥 PublicKey pubKey=keyFactory.generatePublic(x509KeySpec); //数据解密 Cipher cipher=Cipher.getInstance(keyFactory.getAlgorithm()); cipher.init(Cipher.DECRYPT_MODE, pubKey); return cipher.doFinal(data); } //定义密钥类 @Data @AllArgsConstructor public static class KeyStore{ private Object publicKey; private Object privateKey; }}测试结果：

　　

公钥：MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCdnS/LflJjuj4M9V63SPe3YUx0uFD/oVoPRwG2p1HXNSp6x+h7ImVAns9Bx5aKKthTH6V70W0TAdreCwS7WyzakvnHu4zWhGX77JM7/dEgdU5LSK8sI7YLz4bKhCpjBQGXJiKj/3InDPidWzw6w53Ce207HUzrYgR71rM3/OfewwIDAQAB私钥：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使用公钥加密后的数据：i9YbxGll3KUQNsNF71NtXKCgZhZd7tpJjTIXW1sg3avxOv0tZ84UO9eheWwBTF4ptOW4tjXKxva7H2cRSkMknaZ0zGI7cGm/TANevR5cdYVdxa7IBIevDRvj+Lnklo8HQg0QgSqLAQeJ1d38lQkcXoXOi5Qdol2RFTkC7zIPKdc=使用私钥解密后的数据：1234abcd5678