java 中RSA的方式实现非对称加密的实例

package com.sahadev;  import java.security.KeyFactory; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.PrivateKey; import java.security.PublicKey; import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey; import java.security.spec.PKCS8EncodedKeySpec; import java.security.spec.X509EncodedKeySpec;  import javax.crypto.Cipher;  import org.apache.commons.codec.binary.Base64;  public class RSA {    public static void main(String[] args) {     JDKRSA();   }    public static void JDKRSA() {     try {       // 构建密钥对儿       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("Public Key : " + org.apache.commons.codec.binary.Base64.encodeBase64String(rsaPublicKey.getEncoded()));       System.out.println("Private Key : " + org.apache.commons.codec.binary.Base64.encodeBase64String(rsaPrivateKey.getEncoded()));        // 2.私钥加密，公钥解密---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(DH.src.getBytes());       System.out.println("私钥加密，公钥解密------加密 : " + Base64.encodeBase64String(result));        // 3.私钥加密，公钥解密---解密       X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rsaPublicKey.getEncoded());       keyFactory = KeyFactory.getInstance("RSA");       PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);       cipher = Cipher.getInstance("RSA");       cipher.init(Cipher.DECRYPT_MODE, publicKey);       result = cipher.doFinal(result);       System.out.println("私钥加密，公钥解密------解密 : " + new String(result));        // 4.公钥加密，私钥解密---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(DH.src.getBytes());        System.out.println("公钥加密，私钥解密------加密 : " + Base64.encodeBase64String(result));        // 5.公钥加密，私钥解密---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("公钥加密，私钥解密------解密 : " + new String(result));     } catch (Exception e) {       e.printStackTrace();     }   } } 

Public Key : MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAJcFshoP5xm94r2aTbe++aMZMzJtXHxDpqmMQ9aL1cEthr2Xtac+Eckv32Kzb4R8C/6vObNBfd8sWx9FU5N2y6cCAwEAAQ== Private Key : MIIBVAIBADANBgkqhkiG9w0BAQEFAASCAT4wggE6AgEAAkEAlwWyGg/nGb3ivZpNt775oxkzMm1cfEOmqYxD1ovVwS2GvZe1pz4RyS/fYrNvhHwL/q85s0F93yxbH0VTk3bLpwIDAQABAkBdAA7rabug6IRGykztyFcmjxAuD5aSl358jnoAFuCtMo4skfxh1vR4ENFUE0Lt0zJ3CKVH0o9UQDNG0r4jeOGRAiEA3KuXps9OG0AXuxLggg0e7B1Os5C3gNrH2fMqAPjtpY0CIQCvM4EPfdrjjNQiM0ATVBT5jZnw3PRu33pdyISWuoMHAwIgDOLMSUZjxj2Y5Si2CYIgoyMW/G9f99tOvlBvzHy8y+UCIF94MVu/uQdGNlJsmv3tU4CpKLmXrZq9LHDuU1HPUJcBAiEAy/0OS2Q9EBfmPwhsGXF4WMxj4wG0xzNFWxSeZB0qxzk= 私钥加密，公钥解密------加密 : NXF87irBEmK3x/fW7IWY4GuA8AP4Rvj4DJSp2Cjjsoo5X/ScHHKdvYtlM+9TOUAvMeuKWk5WH70g53q7+E73zg== 私钥加密，公钥解密------解密 : Hello,sahadev! 公钥加密，私钥解密------加密 : hjL8928jCbNtVCRhKaYAxQNJmiIAktBskhff2I01pbaHtfGH6GJTcP1i345/3I9OzwoVFxvi/oXgVJsIsg7MOQ== 公钥加密，私钥解密------解密 : Hello,sahadev!