Java中加密算法介绍及其实现( 七 ) _加密

RSA因子分解算法
唯一广泛接受的实现类型
数字加密&数字签名
公钥加密私钥解密
私钥加密公钥解密
工作实现以及填充模式

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加解密流程

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package asymmetrickeyencryption;import org.apache.commons.codec.binary.Base64;import javax.crypto.Cipher;import java.security.*;import java.security.interfaces.RSAPrivateKey;import java.security.interfaces.RSAPublicKey;import java.security.spec.PKCS8EncodedKeySpec;import java.security.spec.X509EncodedKeySpec;/*** 大数因子分解 64的整数倍*/public class RSA {private static final String BASE_STRING = "security DHTest";public static void main(String[] args) throws Exception {jdkRSA();}public static void jdkRSA() throws Exception {//1.初始化秘钥KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");keyPairGenerator.initialize(512);KeyPair keyPair = keyPairGenerator.generateKeyPair();RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();System.out.println("RSAPublicKey:" + Base64.encodeBase64String(rsaPublicKey.getEncoded()));System.out.println("RSAPrivateKey:" + Base64.encodeBase64String(rsaPrivateKey.getEncoded()));//2.私钥加密PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());KeyFactory keyFactory = KeyFactory.getInstance("RSA");PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);Cipher cipher = Cipher.getInstance("RSA");cipher.init(Cipher.ENCRYPT_MODE, privateKey);byte[] result = cipher.doFinal(BASE_STRING.getBytes());System.out.println("JDK RSA 私钥加密:" + Base64.encodeBase64String(result));//公钥解密X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rsaPublicKey.getEncoded());KeyFactory keyFactory1 = KeyFactory.getInstance("RSA");PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);Cipher cipher1 = Cipher.getInstance("RSA");cipher1.init(Cipher.DECRYPT_MODE, publicKey);result = cipher1.doFinal(result);System.out.println("JDK RSA 公钥解密:" + new String(result));//3 公钥加密x509EncodedKeySpec = new X509EncodedKeySpec(rsaPublicKey.getEncoded());keyFactory = KeyFactory.getInstance("RSA");publicKey = keyFactory.generatePublic(x509EncodedKeySpec);cipher = Cipher.getInstance("RSA");cipher.init(Cipher.ENCRYPT_MODE, publicKey);result = cipher.doFinal(BASE_STRING.getBytes());System.out.println("JDK RSA 公钥加密：" + Base64.encodeBase64String(result));//私钥解密pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());keyFactory = KeyFactory.getInstance("RSA");privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);cipher = Cipher.getInstance("RSA");cipher.init(Cipher.DECRYPT_MODE, privateKey);result = cipher.doFinal(result);System.out.println("JDK RSA 私钥解密：" + new String(result));}}

离散对数加密算法
工作实现以及填充模式

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加解密流程

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秘钥的构建

public static void BCElGamal() throws Exception {//添加bc加密工具Security.addProvider(new BouncyCastleProvider());//生成秘钥AlgorithmParameterGenerator algorithmParameterGenerator = AlgorithmParameterGenerator.getInstance("ElGamal");algorithmParameterGenerator.init(256);AlgorithmParameters algorithmParameters = algorithmParameterGenerator.generateParameters();DHParameterSpec dhParameterSpec = algorithmParameters.getParameterSpec(DHParameterSpec.class);KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("ElGamal");keyPairGenerator.initialize(dhParameterSpec,new SecureRandom());KeyPair keyPair = keyPairGenerator.generateKeyPair();PublicKey publicKey = keyPair.getPublic();PrivateKey privateKey = keyPair.getPrivate();System.out.println("ElGamal 公钥：" + Base64.encodeBase64String(publicKey.getEncoded()));System.out.println("ElGamal 私钥：" + Base64.encodeBase64String(privateKey.getEncoded()));}
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