JAVA加解密 -- 数字签名算法

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数字签名 – 带有密钥的消息摘要算法
作用：验证数据完整性、认证数据来源、抗否认（OSI参考模型）
私钥签名，公钥验证
RSA 包含非对称算法和数字签名算法

RSA算法工作流程图
实现代码:

  //1.初始化密钥            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");            keyPairGenerator.initialize(512);            KeyPair keyPair = keyPairGenerator.generateKeyPair();            RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();            RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();            //执行签名            PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());            KeyFactory keyFactory = KeyFactory.getInstance("RSA");            PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);            Signature signature = Signature.getInstance("MD5withRSA");            signature.initSign(privateKey);            signature.update(str.getBytes());            byte[] result = signature.sign();            System.out.println("JDK RSA SIGN:" + Hex.encodeHexString(result));            //3.验证签名            X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rsaPublicKey.getEncoded());            keyFactory = keyFactory.getInstance("RSA");            PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);            signature = Signature.getInstance("MD5withRSA");            signature.initVerify(publicKey);            signature.update(str.getBytes());            boolean falg = signature.verify(result);            System.out.println("JDK RSA VERIFY:"+falg);

DSA DSS -- 数字签名标准 DSA仅包含数字签名ECDSA 椭圆曲线数字签名算法，JDK1.7之后才有的内容    实现方式和RSA一致  只需将指定地方改为EC,再在首句加上Security.addProvider(new BouncyCastlePQCProvider());即可

EC：instance

    JAVA加解密算法源码:http://download.csdn.net/detail/jacxuan/9774737

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