java数字签名三种方式

Java  /  管理员 发布于 1年前   88

以下3钟数字签名都是基于jdk7的
1，RSA

String password="test";// 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();// 2.进行签名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(password.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(password.getBytes());boolean bool = signature.verify(result);

2，DSA

String password="test";// 1.初始化密钥KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("DSA");keyPairGenerator.initialize(512);KeyPair keyPair = keyPairGenerator.generateKeyPair();DSAPublicKey dsaPublicKey = (DSAPublicKey)keyPair.getPublic();DSAPrivateKey dsaPrivateKey = (DSAPrivateKey)keyPair.getPrivate();// 2.进行签名PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(dsaPrivateKey.getEncoded());KeyFactory keyFactory = KeyFactory.getInstance("DSA");PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);Signature signature = Signature.getInstance("SHA1withDSA");signature.initSign(privateKey);signature.update(password.getBytes());byte[] result = signature.sign();System.out.println("jdk dsa sign:" + Hex.encodeHexString(result) );// 3.验证签名X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(dsaPublicKey.getEncoded());keyFactory = KeyFactory.getInstance("DSA");PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);signature = Signature.getInstance("SHA1withDSA");signature.initVerify(publicKey);signature.update(password.getBytes());boolean bool = signature.verify(result);

3，ECDSA

String password="test";// 1.初始化密钥KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC");keyPairGenerator.initialize(256);KeyPair keyPair = keyPairGenerator.generateKeyPair();ECPublicKey ecPublicKey = (ECPublicKey)keyPair.getPublic();ECPrivateKey ecPrivateKey = (ECPrivateKey)keyPair.getPrivate();// 2.进行签名PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(ecPrivateKey.getEncoded());KeyFactory keyFactory = KeyFactory.getInstance("EC");PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);Signature signature = Signature.getInstance("SHA1withECDSA");signature.initSign(privateKey);signature.update(password.getBytes());byte[] result = signature.sign();System.out.println("jdk ecdsa sign:" + Hex.encodeHexString(result) );// 3.验证签名X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(ecPublicKey.getEncoded());keyFactory = KeyFactory.getInstance("EC");PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);signature = Signature.getInstance("SHA1withECDSA");signature.initVerify(publicKey);signature.update(password.getBytes());